Academic literature on the topic 'Land molluscs'
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Journal articles on the topic "Land molluscs"
1
Čejka, Tomáš, Luboš Beran, Jaroslav Č. Hlaváč, et al. "Měkkýši Hostýnských vrchů [Molluscs of the Hostýnské vrchy Hills]." Malacologica Bohemoslovaca 17 (March 14, 2018): 17–27. https://doi.org/10.5281/zenodo.3633826.
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This study deals with the molluscan fauna of the Hostýnské vrchy Hills (Central Moravia, Czech Republic). The main goal was to make a systematic inventory of the molluscan fauna in this area. Snails were collected in September 2010 by hand picking and litter sampling at selected sites. Final database was pooled with earlier published and unpublished data. In total, 85 terrestrial and 20 freshwater mollusc species were recorded at 56 study sites across the area during 2000–2010. Terrestrial snails Monachoides incarnatus, Punctum pygmaeum, Vitrina pellucida, and freshwater molluscs Pisidium casertanum, and Radix labiata were the most frequently recorded species. The land snails Daudebardia brevipes, Eucobresia nivalis, Vitrea transsylvanica, and Chondrula tridens are notable species from the local viewpoint. The clausilid Vestia ranojevici moravica, an endemic subspecies that colonized some regions of Moravia during the Holocene climatic optimum, is an iconic mollusc species in the area, deserving high conservation priority.
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Priyadarsini, Pallabi. "Species diversity of Molluscan fauna of Madhav National Park, Madhya Pradesh, India." International Journal of Zoology and Applied Biosciences 9, no. 5 (2024): 37–40. http://dx.doi.org/10.55126/ijzab.2024.v09.i05.006.
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The present study is based on the Molluscs samples present in National Zoological collection of Central Zone Regional centre, Zoological Survey of India, Jabalpur and the available Literatures. The Samples were collected back in the year from 1970 to 2017 by different tour parties surveying Madhav National Park and its vicinity over the years. The current study reveals the occurrence of 21 species of freshwater and Land mollusks belonging to 18 genera, 10 families, 7 orders of 2 classes of Phylum Mollusca. This is the first report of the mollusks species from this area which will help in evaluate the mollusks diversity of Madhav NP, Shivpuri.
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Čejka, Tomáš, Luboš Beran, Jaroslav Č. Hlaváč, et al. "Měkkýši Hostýnských vrchů [Molluscs of the Hostýnské vrchy Hills]." Malacologica Bohemoslovaca 17 (March 14, 2018): 17–27. http://dx.doi.org/10.5817/mab2018-17-17.
Full textAbstract:
This study deals with the molluscan fauna of the Hostýnské vrchy Hills (Central Moravia, Czech Republic). The main goal was to make a systematic inventory of the molluscan fauna in this area. Snails were collected in September 2010 by hand picking and litter sampling at selected sites. Final database was pooled with earlier published and unpublished data. In total, 85 terrestrial and 20 freshwater mollusc species were recorded at 56 study sites across the area during 2000–2010. Terrestrial snails Monachoides incarnatus, Punctum pygmaeum, Vitrina pellucida, and freshwater molluscs Pisidium casertanum, and Radix labiata were the most frequently recorded species. The land snails Daudebardia brevipes, Eucobresia nivalis, Vitrea transsylvanica, and Chondrula tridens are notable species from the local viewpoint. The clausilid Vestia ranojevici moravica, an endemic subspecies that colonized some regions of Moravia during the Holocene climatic optimum, is an iconic mollusc species in the area, deserving high conservation priority.
4
Gural-Sverlova, Nina. "Spatial differentiation of land mollusc fauna in plain territories of Ukraine." Proceedings of the State Natural History Museum, no. 36 (December 10, 2020): 39–80. http://dx.doi.org/10.36885/nzdpm.2020.36.69-80.
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The taxonomic and ecological composition of the autochthonous land mollusc fauna in different parts of the plain Ukraine was analyzed on the basis of the personal data, collection materials of the State Museum of Natural History of the NAS of Ukraine in Lviv as well as numerous literature sources. Excluding representatives of the genus Helicopsis, the taxonomy and species composition of which in the territory of Ukraine still require clarification, and the steppe part of the Crimean peninsula, in four landscape zones of Ukraine, currently, a total of 109 species of land molluscs, which are autochthonous for at least part of the analyzed territory, are registered. The maximum species diversity (103 species and 2 representatives of the genus Helicopsis) is recorded in the zone of deciduous forests, followed by the right-bank part of the forest-steppe zone. The smallest number of the autochthonous species of land molluscs was noted for the right-bank part of the steppe zone. Within the Ukrainian Polesie and the forest-steppe zone of Ukraine, the taxonomic diversity of land molluscs decreases from west to east. The number of the registered autochthonous species decreases, respectively, by 1.5 and 1.7 times, and the generic diversity by 1.3 and 1.5 times. In the steppe zone, the main centre of the species diversity is the Donetsk Upland, located in the east of the country. In taxonomic and ecological composition, land mollusc complexes of the right-bank part of the forest-steppe zone are closer to the zone of deciduous forests, in its left-bank part – to the left-bank steppe. In general, the spatial differentiation of land mollusc fauna in the plain territories of Ukraine is more strongly associated not with the boundaries of landscaped zones, but with the location of these territories with respect to the Dnieper bed and with some uplands, where the species diversity of land molluscs of the zone of deciduous forests and forest-steppe zone (Podolian Upland) and the steppe zone (Donetsk Upland) is concentrated.
5
Shepeleva, I. P. "Vitreous body of the camera-like eyes of terrestrial gastropod mollusks (Heterobranchia, Stylommatophora)." Ruthenica, Russian Malacological Journal 31, no. 2 (2021): 93–104. http://dx.doi.org/10.35885/ruthenica.2021.31(2).5.
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Using the methods of light and electron microscopy, the morphological properties were studied, and the evolutionary changes in the vitreous body of the camera-like eyes of some species of terrestrial gastropod pulmonate molluscs were traced. It was demonstrated that all the considered properties of the vitreous body of molluscs are typical for terrestrial pulmonates. In the course of evolution, as a result of the land development by mollusks, the properties of their vitreous body have hardly changed.
6
Fera Rahmawati, Yunita, Rizka Apriani Putri, Tatag Bagus Putra Prakarsa, Milade Annisa Muflihaini, and Yoga Putra Aliyani. "Diversity and Distribution of Molluscs in the Intertidal Zone of Nglambor Beach, Gunung Kidul, Yogyakarta." BIO Web of Conferences 33 (2021): 01002. http://dx.doi.org/10.1051/bioconf/20213301002.
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The intertidal zone is the area between the highest and lowest tides, which represents the transition from ocean conditions to land conditions. This study aimed to determine the diversity and distribution of mollusks that exist along the intertidal zone of Nglambor Beach, between August and November 2020. Observations of all molluscs were carried out at two random stations using 10 plots measuring 1 x 1 m 2 with 5 meters. A total of two classes of Mollusca (Gastropod and Bivalvia) belonging to twelve families and 19 species were found from upper to lower an intertidal zone. The upper intertidal zone was recorded to have the highest diversity and an evenness index (Shannon-Wiener diversity index: H ’= 2.524 and Pielou evenness index: J’ = 0.932) compared to the middle and lower zones. It can be concluding that the diversity index in the study location is categorized as medium and its evenness is high. Thais hippocastanum is the most dominant species found in the upper and middle zones, while Thais tissoti dominates in the lower zone. This research contributed to a preliminary checklist on molluscs, which will support a baseline study on the intertidal in future.
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Inkhavilay, Khamla, Chirasak Sutcharit, Ueangfa Bantaowong, et al. "Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda)." ZooKeys 834 (April 3, 2019): 1–166. http://dx.doi.org/10.3897/zookeys.834.28800.
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The land area of Laos is composed of a large variety of undisturbed habitats, such as high mountainous areas, huge limestone karsts and the lower Mekong Basin. Therefore, Laos is expected to have a high species diversity, especially for the land snails. However, with respect to research on malacology, Laos is probably the least well-researched area for land snail diversity in Indochina (including Laos) over the past few centuries. The handful of species lists have never been systematically revised from the colonial period to the present, so these classifications are outdated. Herein we present the first comprehensive annotated checklist with an up-to-date systematic framework of the land snail fauna in Laos based on both field investigations and literature surveys. This annotated checklist is collectively composed of 231 nominal species (62 ‘prosobranch’ and 169 heterobranches), of which 221 nominal species are illustrated. The type specimens of 143 species from several museum collections and/or 144 species of newly collected specimens are illustrated. There are 58 species recorded as new to the malacofauna of the country, and two new replacement names are proposed as Hemiplectalanxangnica Inkhavilay and Panha, nomen novum (Ariophantidae) and Chloritiskhammouanensis Inkhavilay and Panha, nomen novum (Camaenidae). Four recently described species of the genus Amphidromus from Laos, “thakhekensis”, “richgoldbergi”, “attapeuensis” and “phuonglinhae” are synonymized with previously described species. In addition, thirteen nominal species are listed as uncertain records that may or may not occur in Laos. This annotated checklist may inspire malacologists to carry on systematic research in this region.
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Inkhavilay, Khamla, Chirasak Sutcharit, Ueangfa Bantaowong, et al. "Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda)." ZooKeys 834 (April 3, 2019): 1–166. https://doi.org/10.3897/zookeys.834.28800.
Full textAbstract:
The land area of Laos is composed of a large variety of undisturbed habitats, such as high mountainous areas, huge limestone karsts and the lower Mekong Basin. Therefore, Laos is expected to have a high species diversity, especially for the land snails. However, with respect to research on malacology, Laos is probably the least well-researched area for land snail diversity in Indochina (including Laos) over the past few centuries. The handful of species lists have never been systematically revised from the colonial period to the present, so these classifications are outdated. Herein we present the first comprehensive annotated checklist with an up-to-date systematic framework of the land snail fauna in Laos based on both field investigations and literature surveys. This annotated checklist is collectively composed of 231 nominal species (62 'prosobranch' and 169 heterobranches), of which 221 nominal species are illustrated. The type specimens of 143 species from several museum collections and/or 144 species of newly collected specimens are illustrated. There are 58 species recorded as new to the malacofauna of the country, and two new replacement names are proposed as Hemiplecta lanxangnica Inkhavilay and Panha, nomen novum (Ariophantidae) and Chloritis khammouanensis Inkhavilay and Panha, nomen novum (Camaenidae). Four recently described species of the genus Amphidromus from Laos, "thakhekensis", "richgoldbergi", "attapeuensis" and "phuonglinhae" are synonymized with previously described species. In addition, thirteen nominal species are listed as uncertain records that may or may not occur in Laos. This annotated checklist may inspire malacologists to carry on systematic research in this region.
9
Surbakti, Suriani. "Study of the Types of Molluscs Used by Communities, in Lake Sentani, Papua." Jurnal Moluska Indonesia 4, no. 2 (2020): 68–73. http://dx.doi.org/10.54115/jmi.v4i2.10.
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The distribution of molluscs in Lake Sentani depends on their broad adaptability, dispersal ability, and zoogeographic history and ecological conditions. Ecological conditions in Papua have undergone many changes after the passage of special autonomy. A study on mollusk groups used by the community was carried in May-June 2018. Several government programs that require new land clearing for settlements, infrastructure development and agricultural areas have resulted in the conversion of sago forests, rivers, swamps, mangrove forests and lakes as places of interest. New settlements and shopping centers, consequently the degradation of Lake Sentani is unavoidable. Lake Sentani is currently under a lot of pressure from both internal and external factors. Some observers of lake ecology generally only conduct studies on water quality, but have not studied much of the fauna diversity, the potential of the lake's biological resources, let alone study the diversity of mollusc species and the types used by the community and the threat to the sustainability of the mollusk groups that are used. The public's understanding of the existence of Molluscs from an ecological and economic point of view has contributed greatly. From the survey results in Lake Sentani, the types used by the community are: Thiara sp. Pomacea canaliculata, Pilsbryoconcha exilis, Bellamya sp, and Faunus sp. in the in-let area. Utilization of mollusk groups as a source of family economy is also the second source of protein after fish, while in mountainous areas, certain types of mollusk shells are still used as a legally valid medium of exchange locally.
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Čiliak, Marek, and Jozef Šteffek. "Vyhodnotenie malakofauny z náplavov Neresnice (stredné Slovensko) [Interpretation of molluscan fauna from the Neresnica River flood deposits (Central Slovakia)]." Malacologica Bohemoslovaca 10 (November 23, 2011): 73–78. http://dx.doi.org/10.5817/mab2011-10-73.
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Sampling of flood debris deposits can be useful method in insufficiently surveyed areas. This sampling method also allows us to detect the presence of rare and endangered species in the study area. We studied flood debris along the Neresnica River to gather data on mollusc fauna of the Pliešovská Kotlina basin and the Javorie Mts. (Central Slovakia). In spring 2010, samples of flood debris were taken at three sites along the river. Molluscan thanatocoenoses were composed of 68 species (56 terrestrial and 12 aquatic ones). The most notable records were two subterranean species – Lucilla scintilla and L. singleyana, and also the species of nature conservation interest – Vertigo angustior. We found representatives of all ecological groups of molluscs, which provide the evidence of ecosystem diversity in various habitats along the river. We documented that the land use of the studied drainage basin was only partially reflected by the structure of mollusc assemblages from flood deposits.
Dissertations / Theses on the topic "Land molluscs"
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Sharland, Eva Catherine. "Autecology of Vertigo angustior and Vertigo geyeri in Wales." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369889.
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Davis, S. A. "Man, molluscs and mammals : A study of land use and resources in the late Holocene of the Maritime Provinces of Canada." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381834.
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Souza, Fabíola Almeida Matos de. "Ciclo de vida e biologia comportamental de Rumina decollata Linnaeus, 1758 (Mollusca, Subulinidae) em laboratório." Universidade Federal de Juiz de Fora, 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/1058.
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Previous issue date: 2013-02-28<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O filo Mollusca é composto por diversas espécies que são amplamente utilizadas pelo
ser humano na economia em setores diversos como alimentação e saúde pública. Devido a
isto, houve intensa disseminação de espécies exóticas entre diversas regiões do globo,
tornando necessário o conhecimento sobre a biologia e o comportamento desses moluscos nas
áreas onde foram introduzidos para se prever os possíveis danos à malacofauna e flora
nativas. Tais estudos também são relevantes para o desenvolvimento de estratégias de manejo
quando o aumento excessivo da população de uma determinada espécie torna-se prejudicial
ao ambiente, além de uma possível utilização de moluscos como ferramentas de controle
biológico. Rumina decollata (Linnaeus, 1758) é uma espécie oriunda da região Mediterrânea
que foi introduzida na América do Norte para o controle biológico de Helix aspersa Müller,
1774 em plantações de frutas cítricas, porém, houve intenso aumento das populações que
levou a uma proibição da entrada e criação de R decollata em algumas regiões dos EUA e
atualmente, a espécie é encontrada em países da América do Sul como Argentina e Brasil.
Não há estudos que descrevam os atos comportamentais nem a biologia da espécie no Brasil,
apesar da sua ocorrência em algumas regiões do país. Este estudo foi realizado para esclarecer
aspectos biológicos tais como crescimento, reprodução, mortalidade e comportamento de R.
decollata em condições de laboratório. Para a realização dos experimentos sobre a biologia da
espécie, foram utilizados moluscos criados agrupados (10 moluscos/ grupo) e isolados (30
moluscos/grupo). Para observar o padrão de crescimento os moluscos foram pesados e
medidos mensalmente para posterior comparação. Os moluscos foram criados isolados para
verificar a ocorrência de autofecundação, e comparar tempo para alcance de maturidade,
fecundidade e eclodibilidade dos ovos. Os resultados demonstraram que moluscos agrupados
e isolados diferiram quanto ao crescimento entre 0 a 60 dias, com uma maior taxa para os
moluscos criados isolados, seguido de uma estabilização, caracterizando um crescimento
determinado, padrão que difere do encontrado para outros subulinídeos. O peso diferiu
significativamente entre isolados e agrupados, com maiores valores para moluscos agrupados.
Não houve mortalidade para os moluscos isolados durante o período de observação. O alcance
da maturidade sexual ocorreu a partir de 90 dias para os agrupados e 120 dias para os
isolados. Verificou-se a ocorrência de autofecundação, porém, os moluscos realizaram
preferencialmente a fecundação cruzada, a qual também foi responsável por um maior número
de ovos viáveis. Ficou evidenciado que R. decollata apresentou diferenças em sua biologia
quando comparada com os estudos de outros autores em diferentes localidades. Para a
descrição do comportamento e interações entre adultos e jovens, foram utilizados 30 moluscos
jovens e o mesmo número de adultos observados durante 24 horas através do método scan
sample a intervalos de 20 minutos. Os moluscos adultos e jovens apresentaram-se mais ativos
durante o período noturno, com somente um ato comportamental (“Interagir”) diferindo
significativamente durante as 24 horas de observação, com maior interação entre os adultos.
Adultos e jovens diferiram quanto ao ato “Alimentar” e “Deslocar” somente em dois horários
e três distintos do período noturno respectivamente. Não houve influência da umidade relativa
do ar no comportamento dos moluscos, porém, houve correlação entre a temperatura média e
a atividade de adultos e jovens. Tais resultados comprovam que o horário de atividade de R.
decollata é semelhante ao descrito para diversos moluscos gastrópodes, inclusive
subulinídeos. A diferença entre os atos comportamentais de jovens e adultos demonstra uma
possível diferenciação de nichos.<br>The phylum Mollusca is composed by several species that are largely used in many
economic sectors such as food and public health. Because of it, there was a dissemination of
alien species among several parts of the world, what make necessary the knowledge of life
cycle and behavior in the regions of introduction of these species, in order to predict possible
damages to native fauna and flora. These studies are also important to the development of
control strategies in case of populations increase, turning a species into a pest, besides, its is
useful tin case of using a species as biological control. Rumina decollata (Linnaeus, 1758) is a
land snail from Mediterranean area that was introduced in the North of USA to control
populations of Helix aspersa Müller, 1774 in citrus sp plantations, however, occurred an
overpopulation that lead to a prohibition of R. decollata entrance and rearing in this country
and nowadays, the species is found in South America in Argentina and Brazil. There is a lack
of studies that describe the behavioral biology and the lifecycle of this species in Brazil,
despite its occurrence in some districts of the country. This study was realized in order to
clarify biological traits such growth, reproduction and behavior of this species in laboratory
conditions. For life cycle assay, snails were created grouped (10 snails/ group) and isolated
(30 snails 1/goup). To analyze growth patterns, snails were weighted and measured every
month. The isolation was to verify the occurrence of self-fertilization and to compare the time
to onset sexual maturity, fecundity and egg hatchability. Results showed that snails grouped
and isolated differed in growth between 0 and 60 days, with high rate to isolated snails. There
was stabilization that characterize determinate growth pattern that differ from other
subulinids. Weight was significantly different, with higher rates to grouped snails. It was not
observed mortality in isolated snails during the observation period. The reaching of maturity
occurred from 90 days for grouped snails and from 120 days to isolate. It was verified selffertilization,
although the cross fertilization seems to be the pattern what can be confirmed by
the higher number of viable eggs. It was evidenced that R. decollata showed differences in its
biology when compared to studies realized in other regions. To describe behavior of juvenile
and adult individuals, it was used 30 snails of each age, observed for 24 hours by the scan
samplé method. Adult and juvenile were more active during nocturnal period, with only one
act (“Interact”) significantly different during the 24 hours, with more interaction between
adults. Adult and juvenile showed difference in the acts “Feed” and “Dislocate” in two and
three different hours in nocturnal period respectively. It was not observed influence of relative
air humidity, but there was a correlation between mean temperature and the activity of adult
and juvenile snails. Such results demonstrate that the activity period of R. decollata is alike to
other terrestrial snails, including subulinids. The difference between behavioral displays of
juvenile and adults indicate the occurrence of niche differentiation.
4
Menez, Alexander. "Pattern and process in southern Iberian land mollusc diversity." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54803/.
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Locations in southern Iberia were sampled to assess patterns in the distributions and diversities of land molluscs and to determine the effects of habitat structure on diversity at differing scales. In Part One of the study 91 sites, each 1km , were sampled. Species with higher abundances were present at more sites than those with lower abundances. Low levels of similarity were found between the land mollusc communities. The monthly mean of sunshine hours per day during the wet period and the annual mean absolute humidity provided the best explanation of the species data. The results suggest that the heterogeneous habitats from the region allow a large number of mollusc species to co-exist in varied communities possibly controlled by historical and regional factors including climate and geology. In Part Two of the study 60 sites, each 1600m2, were sampled. Twenty sites were located in each of three habitat types (sand, steppe and garigue), and for each habitat type ten sites were sampled in both the wet period and dry period. Diversities and habitat structure were assessed at 1m , 5m and 20m . There were differences in the number of species, abundances and diversities between habitats, and between the wet and dry periods at each habitat. Increasing heterogeneity and complexity increased the number of species, but not their abundances. Components of habitat structure affected the number of species and abundances independently of the total complexity. Relationships between heterogeneity, complexity, number of species and species diversity were scale-dependent with most of the statistically significant relationships between these occurring at lm2. Increases in abundances and number of species with increasing area support the passive sampling model and the area per se hypothesis.
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Coppolino, Marla Lee. "LAND SNAIL ABUNDANCE AND DIVERSITY WITH ASSOCIATED ECOLOGICAL VARIABLES IN SIX SOUTHERN ILLINOIS COUNTIES." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/43.
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Various ecological parameters, including soil pH, calcium, and habitat complexity have been suggested in the literature as having influence on land snail abundance and diversity. I compared relationships between 15 ecological parameters and snail abundance and diversity. 5,393 snails of 72 species were collected from 60 sites in 2007. Habitat observations were recorded in the field and soil core samples taken at each site and later analyzed for soil moisture, organic matter, cation exchange capacity, pH, calcium, magnesium, zinc, potassium, phosphorus, sulfur, boron, manganese, iron and copper. Statistical analyses were run using these soil factors plus a habitat complexity index (from combined values assigned to different levels of vegetation, topography and exposed rock), for a total of 15 parameters. To reduce the number of parameters and arrive at a more biologically meaningful model, Bayesian Information Criteria analysis (BIC) was run for abundance and diversity. The resulting best-fitted BIC model for abundance contained 3 parameters (pH, S, and habitat complexity) (R2 = 0.47), all of which were positively associated with abundance in a multiple regression analysis. For diversity, the best-fitted BIC model also contained 3 parameters (Ca, Fe, and habitat complexity) (R2 = 0.54). Ca and habitat complexity showed a positive association in the multiple regression analysis, but Fe was inversely associated with diversity, suggesting Fe could potentially act as an ecological limiting factor to it. These results suggest that land snail abundance and diversity are best treated separately in analyses, as they are influenced by different variables, with the exception of habitat complexity, which is suggested to have a positive association with both abundance and diversity. The regression model equations have potential value in that they can be used to predict snail abundance and diversity in areas that have not been assessed.
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Ferreira, Paula Botelho. "Estudo citogenético de Leptinaria unilamellata (d´Orbigny, 1835) (Mollusca, Gastropoda, Subulinidae)." Universidade Federal de Juiz de Fora (UFJF), 2014. https://repositorio.ufjf.br/jspui/handle/ufjf/7110.
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Previous issue date: 2014-02-24<br>Os moluscos pulmonados têm sido reconhecidos como modelos interessantes para o estudo de biodiversidade oculta em função de algumas características como a baixa vagilidade, capacidade de realizar auto-fecundação, além do histórico de identificações específicas baseadas somente nas conchas, caráter esse hoje sabidamente insuficiente para a distinção de espécies. A citogenética constitui uma abordagem que pode contribuir para a resolução taxonômica de grupos de moluscos terrestres, sendo, entretanto necessário o estabelecimento de protocolos experimentais. O objetivo do presente trabalho foi estabelecer protocolos para o estudo citogenético de moluscos terrestres, através da realização de bioensaios, visando testar diferentes tecidos, concentrações dos reagentes indicados e tempos de incubação. Para isso, foi realizada uma revisão prévia dos protocolos descritos para o filo Mollusca e delineados protocolos, posteriormente testados em bioensaios, utilizando-se a espécie Leptinaria unilamellata (Pulmonata, Subulinidae) como modelo experimental. O presente trabalho descreve o cariótipo da espécie L. unilamellata, com fórmula cariotípica 22m+6sm. Os resultados obtidos estão de acordo com os números cromossômicos descritos na literatura para espécies de moluscos terrestres da superfamília Achatinoidea, variando de 2n=44 a 2n=60 cromossomos. Além disso, com a técnica de coloração de nitrato de prata, observamos a presença de duas marcações no núcleolos correspondente às regiões organizadores de nucléolos, ou seja, regiões ativas do DNA. O estabelecimento de protocolos de citogenética adequados para o estudo de moluscos terrestres permitirá o aumento do número de espécies cariomorfologicamente estudadas, contribuindo para a melhor resolução da taxonomia e evolução desse grupo.<br>Pulmonate molluscs have been recognized as interesting models to study hidden biodiversity due to some biological characteristics as low vagility and self-fertilization capacity, besides the historic of species descriptions based solely on the shell. Cytogenetics is used to infer species relationships in several plant and animal taxa. This approach may contribute to the better resolution of the taxonomy within Pulmonata. The present study aimed to establish protocols to cytogenetic studies of terrestrial molluscs testing different target tissues, reagents concentrations and incubation times. We performed a review of the cytogenetic protocols described in the literature for phylum Mollusca and after that; we delineated protocols which were tested in bioassays, using the species Leptinaria unilamellata as experimental model. In the present study we found that L. unilamellata present diploid number of 56 chromosomes, 44 metacentrics e 12 submetacentrics. This result is in accordance with the chromosome numbers described to terrestrial snails from superfamily Achatinoidea, which varies from 2n=44 to 2n=60. Furthermore, with the technique of silver nitrate staining, we found the presence of two sites in the nucleus corresponding to nucleolus organizer regions, or active regions of DNA. The establishment of cytogenetic protocols adequate to terrestrial snails will allow increasing the number of land snail’ species karyomorphologically studied, contributing to the better resolution of the taxonomy and evolution of this group.
7
Viana, Tiago Abreu. "Uso do espaço por Hypselartemon contusulus (Férussac, 1827) (Gastropoda, Streptaxidae) da Trilha da Parnaioca, Ilha Grande, Rio de Janeiro, Brasil." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3525.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O comportamento espacial dos indivíduos é um componente chave para se entender a
dinâmica de população dos organismos e esclarecer o potencial de migração e dispersão das
espécies. Vários fatores afetam a atividade de locomoção de moluscos terrestres, como temperatura,
luz, umidade, época do ano, tamanho da concha, sexo, estratégia reprodutiva, idade, densidade de coespecíficos
e disponibilidade de alimento. Um dos métodos usados para estudar deslocamento de
gastrópodes terrestres é o de marcação-recaptura. Gastrópodes terrestres se prestam a este tipo de
estudo por causa de (1) seu reduzido tamanho, (2) fácil manejo, (3) fácil captura e (4) pequenas
distâncias de deslocamento e, consequentemente, reduzidas áreas de vida. Estes organismos servem
como modelo para o estudo de ecologia espacial e dispersão. Estudos de população, investigando o
uso do espaço, a distribuição espacial, a densidade populacional e a área de vida são escassos para
moluscos terrestres e ainda mais raros em áreas naturais tropicais. Nosso objeto de estudo é
Hypselartemon contusulus (Férussac, 1827), um molusco terrestre carnívoro, da família Streptaxidae,
muito abundante na serrapilheira, em trechos planos de mata secundária na Trilha da Parnaioca, Ilha
Grande, Rio de Janeiro. A espécie é endêmica para o estado do Rio de Janeiro. Seu tamanho é de até
7,2 mm de altura, apresentando 6 a 7 voltas. Neste trabalho estudamos as variáveis temperatura
ambiente, temperatura do solo, umidade do ar, luminosidade, profundidade do folhiço, tamanho do
animal, densidade de co-específicos e densidade de presas, relacionando estes dados ecológicos ao
deslocamento observado em Hypselartemon contusulus. Uma das hipóteses de trabalho é que estas
variáveis afetam seu deslocamento. O trabalho foi realizado na Ilha Grande, situada ao sul do Estado
do Rio de Janeiro, no município de Angra dos Reis. Os animais foram capturados e marcados com
um código individual pintado na concha com corretor ortográfico líquido e caneta nanquim. As
distâncias de deslocamento, em cm, foram registradas medindo-se as distâncias entre marcadores
subsequentes. Os resultados encontrados indicam que o método utilizado é eficaz para marcar
individualmente Hypselartemon contusulus em estudos de médio prazo (até nove meses). Sugerimos
o uso deste método de marcação para estudos com gastrópodes terrestres ameaçados de extinção,
como algumas espécies das famílias Bulimulidae, Megalobulimidae, Streptaxidae e
Strophocheilidae. Hypselartemon contusulus não mantém uma distância mínima de seus vizinhos, é
ativo ao longo de todo o ano e ao longo do dia, demonstrando atividade de locomoção e predação.
Não foram encontrados animais abrigados sob pedra ou madeira morta. Não foram observados locais
de atividade em oposição a lugares de repouso/abrigo. Beckianum beckianum (Pfeiffer, 1846) foi a
presa preferencial. A densidade populacional variou de 0,57 a 1,2 indivíduos/m2 entre as campanhas
de coleta. A espécie desloca-se, em média, 26,57 17,07 cm/24h, na Trilha da Parnaioca, Ilha
Grande. A área de vida de H. contusulus é pequena, sendo de, no máximo, 0,48 m2 em três dias e
3,64 m2 em 79 dias. O deslocamento da espécie variou ao longo do ano, mas esta variação não é
afetada pelas variáveis ecológicas estudadas. Este é, portanto, um comportamento plástico em H.
contusulus e, provavelmente, controlado por fatores endógenos.<br>Spatial behavior of individuals is a key component to understanding and clarify migration and
dispersion potential of species. Many factors affect locomotory activity of land mollusks, like
temperature, light, humidity, period of the year, shell size, sex, reproductive strategy, age, co-specific
density and food quantity. The mark-recapture method is used to study displacement of land snails.
Land snails lend themselves to this kind of study because of their small size, easy handling, easy
capture and small displacement distances and, consequently, small home ranges. These organisms
serve as model to study spatial ecology and dispersion. Studies on population, concerning spatial
behavior and distribution, population density and home range are rare for land snails and even rariest
in natural tropical areas. Our study object is Hypselartemon contusulus (Férussac, 1827), a
carnivorous land snail, family Streptaxidae, very common in leaf litter, in plane parts of secondary
forest in the Trail of the Parnaioca, Ilha Grande, Rio de Janeiro. The species is endemic to Rio de
Janeiro state. His size is 7.2 mm height, in maximum, showing six to seven whorls. In this work, we
studied the environment variables temperature, soil temperature, air humidity, luminosity, leaf litter
depth, shell size, co-specific density and prey density, connecting these ecologic data to the
displacement observed to H. contusulus. The research hypothesis is that these variables affect its
displacement. The work was carried out in Ilha Grande, south of the state of Rio de Janeiro, in the
Angra dos Reis municipality. The animals were captured and marked with an individual code painted
in the shell with orthographic liquid corrector and nankeen ink. The displacement distances, in cm,
were recorded measuring the distances between subsequent markers. The results indicate that the
used method is effective to mark individually H. contusulus in intermediate-term studies (until nine
months). We suggest the use of this mark method to studies about land threatened land snailst, like
some species of the families Bulimulidae, Megalobulimidae, Streptaxidae and Strophocheilidae.
Hypselartemon contusulus does not maintain a minimum distance from its neighbours. The species is
active during all the day and all year, showing locomotory activity and predation. Animals were not
found sheltered under rock or dead wood. Sites of activity in opposition of sites of resting were not
observed. Beckianum beckianum (Pfeiffer, 1846) was the preferential prey. Population density varied
from 0.57 to 1.2 individuals/m2 between sampling episodes. The species move, in media, 26.57
17.07 cm/24h, in the Trail of the Parnaioca, Ilha Grande. Home range of H. contusulus is small and
does not exceed 0.48 m2, in three days and 3.64 m2 in 79 days. Displacement varied during the year,
but this variation is not affected by the ecological variables. This is a plastic behavior in H.
contusulus and, probably, controlled by endogenous factors.
8
Santos, Emily Oliveira. "Aspectos da reprodução, crescimento e comportamento agregativo de Allopeas gracilis (Hutton, 1834) (Mollusca, Subulinidae)." Universidade Federal de Juiz de Fora, 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/1490.
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Previous issue date: 2013-02-28<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O objetivo do presente trabalho foi descrever a história de vida da espécie
Allopeas gracilis, através da avaliação do crescimento e reprodução. Avaliou-se
também a influência do isolamento sobre esses aspectos, o investimento reprodutivo, o
comportamento de retenção de ovos no oviduto e o comportamento agregativo. Para
tanto, foram realizados quatro experimentos. No primeiro experimento, que objetivou
avaliar o crescimento e a reprodução de indivíduos mantidos pareados e isolados,
realizou-se o acompanhamento do ciclo biológico de 60 moluscos, dos quais 30 foram
mantidos aos pares e 30 foram mantidos em isolamento durante 120 dias. A. gracilis
apresentou grande plasticidade na forma de alocação de energia entre crescimento e
reprodução de acordo com a forma de criação, sendo a reprodução e o crescimento
maior para os animais mantidos pareados. No segundo experimento, que teve como
objetivo caracterizar o investimento reprodutivo da espécie acompanhou-se durante 180
dias 60 moluscos, dos quais 30 moluscos foram mantidos isolados e 30 moluscos foram
mantidos pareados. Após o nascimento dos filhotes, os moluscos parentais e respectiva
prole foram pesados para o cálculo do investimento reprodutivo. Na idade de 120 dias,
os moluscos mantidos isolados tiveram um investimento reprodutivo maior do que os
moluscos pareados, nas idades de 150 dias e 165 dias foram os moluscos mantidos
pareados que apresentaram um maior investimento reprodutivo. Já na idade de 180 dias
não houve diferença significativa entre os investimentos reprodutivos dos dois grupos.
O terceiro experimento teve como objetivos caracterizar o comportamento de retenção
de ovos no oviduto. Para tanto foram separados 60 moluscos recém-eclodidos em caixas
individuais formando dois grupos experimentais de 30 moluscos cada e observados até
a detecção da presença de filhotes no oviduto e constatação da maturidade sexual. Na
primeira fase do experimento, um grupo foi mantido em condições favoráveis de
umidade do substrato, enquanto o outro foi mantido em condições de dessecação. Foi
verificada a frequência de liberação de filhotes pelos moluscos de ambos os grupos.
Após um período de 40 dias, o substrato da caixa em que foi mantido o grupo
submetido à dessecação foi novamente umedecido, por mais 20 dias, constituindo a
segunda fase do experimento. Observou-se que o grupo mantido em condições
desfavoráveis de umidade reproduziu menos do que o grupo mantido em condições
favoráveis, mostrando que com a falta de umidade os moluscos retêm os ovos no
oviduto. No quarto experimento, que teve como objetivo caracterizar o comportamento
agregativo de A. gracilis, foram obtidos 150 moluscos, que foram distribuídos em 15
caixas plásticas. Em cada caixa foram colocados quatro discos plásticos identificados,
em posição equidistante, os quais serviram de abrigos para os animais. Foram colocados
10 animais no centro de cada caixa. Após 24, 48, 72, 96, 120 e 168 horas foram
observados o número de agregados formados, a posição dos agregados (sob qual disco),
o número de indivíduos por agregado e o número de indivíduos isolados. Após 168
horas de experimento os indivíduos foram transferidos para outras caixas, contendo
terra vegetal, três novos discos e o disco que continha o maior agregado após as 168
horas. Foi verificado, após 24 e 48 horas, o número de indivíduos sob o disco
condicionado. Constatou-se que A. gracilis apresenta comportamento agregativo, assim
como outras espécies de subulinídeos. Em todas as caixas utilizadas e em todos os
intervalos de tempo ao longo das primeiras 168 horas e das 48 horas seguintes houve a
formação de agregados.<br>The aim of this work was to describe the life history of the species Allopeas gracilis,
through the assessment of growth and reproduction. We also evaluated the influence of
isolation, the reproductive investment, the eggs retention behavior and aggregative
behavior of A. gracilis. Therefore, four experiments were conducted. The first
experiment aimed to evaluate the growth and reproduction of individuals kept in
isolation or in pairs. A. gracilis showed great plasticity in the energy allocation between
growth and reproduction, the egg production and growth rates being higher for paired
animals. The second experiment aimed to evaluate the reproductive effort of A. gracilis.
After the birth of the juveniles, the offspring and parental individuals were weighed to
calculate the reproductive investment. At the age of 120 days, the snails kept isolated
showed higher reproductive effort than paired snails. At the age of 180 days there was
no significant difference between the two groups. The third experiment aimed to
characterize the behavior of eggs retention. Sixty newly hatched snails were assigned to
individual boxes. The molluscs were observed until the detection of embryos in the
oviduct, which confirmed that the snails have attained sexual maturity. In the first phase
of the experiment, one group was kept in a favorable moisture condition, while the other
was maintained in a desiccation condition. At the second phase of the experiment, after
a period of 40 days, the substrate of the boxes in which the snails subjected to
desiccation were maintained has been moistened. It was observed that the group kept in
unfavorable moisture condition produced fewer eggs than the group kept in a favorable
condition, retaining these egg in the oviduct and releasing then when the terrário were
moistened again. The fourth experiment aimed to characterize the aggregative behavior
of A. gracilis. For this, 150 molluscs were distributed in 15 plastic boxes. In each box
four labeled plastic disks were placed in equidistant positions. These disks have served
as shelters for the snails. Ten snails were placed in the center of each box. After 24, 48,
72, 96, 120 and 168 hours the number of aggregates formed were observed, as well the
position of the aggregates (in which disk) and the number of individuals per aggregate.
After 168 hours of experiment the snails were transferred to boxes containing new
substrate, three new disks and disk that contained the largest aggregate after 168 hours
(conditioned disk). After 24 and 48 hours, the number of individuals in the conditioned
disk was obserfved. It was found that A. gracilis exhibits aggregative behavior like
other species of subulinids.
9
Santos, Tércia Vargas dos. "Variabilidade conquiliológica, anatômica e molecular em Subulina octona (Brugüière, 1789) (Mollusca, Gastropoda, Subulinidae)." Universidade Federal de Juiz de Fora, 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/1549.
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Previous issue date: 2012-02-28<br>FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais<br>O conhecimento atual da diversidade de moluscos terrestres não leva em consideração a
variabilidade intra e interespecífica, principalmente no que diz respeito a espécies de clima
tropical, como é o caso de Subulina octona. A associação entre análises morfométricas e
moleculares, ambas inéditas para estudos em S. octona, tem permitido a identificação de
táxons e a compreensão de suas relações. No presente estudo, foi observada variabilidade na
concha, no sistema reprodutor, na coloração corporal e na estrutura molecular com base na
COI do DNA mitocondrial de populações de S. octona. A análise morfométrica ao longo do
desenvolvimento demonstrou que a variabilidade intrapopulacional diminuiu ao longo do
desenvolvimento dos moluscos e foi maior nas populações com dois fenótipos de coloração
corporal. O componente que melhor explicou a variabilidade na maior parte da vida foi o
comprimento da concha, seguido pela largura da abertura. Como a distância geográfica não
explicou a variação na forma da concha, acredita-se que possa estar havendo um considerável
fluxo gênico por ação antrópica e que a seleção esteja atuando modelando os padrões
morfométricos na espécie. O fato de os padrões de crescimento e a forma final da concha na
idade adulta terem variado entre populações mesmo em condições idênticas de criação,
demonstra o importante papel da determinação genética. A anatomia do sistema reprodutor foi
semelhante entre populações, mas a morfometria foi variável entre indivíduos e entre
populações. Dentro das populações a porção masculina do sistema reprodutor foi mais
variável que a feminina, conforme esperado para estruturas que sofrem seleção sexual. Já
entre populações, a maior diferença foi observada na porção feminina. O sistema reprodutor
foi mais variável que a concha, porém apresentando compatibilidade entre as populações
quanto à forma das estruturas. A diferenciação morfométrica e fenotípica para coloração
corporal não foram corroboradas pela variação molecular uma vez que indivíduos com
mesmo haplótipo COI foram variáveis para concha e cor da massa cefalopodal. O modelo de
evolução neutra das sequências foi aceito para as amostras analisadas apesar de nem todas as
mutações serem silenciosas, destacando o papel da deriva na evolução da espécie. A baixa
variabilidade de algumas populações pode ser reflexo da forte endogamia, devido à baixa
capacidade de dispersão e capacidade de autofecundação da espécie, a despeito do fluxo
gênico via dispersão passiva por ação antrópica. Foi observada estruturação genética para uma
das populações, por apresentar um haplótipo exclusivo e formação de uma linhagem
diferenciada no dendrograma de Máxima Verossimilhança. As diferentes linhagens
apresentaram diferenças morfométricas para estruturas reprodutivas que evidenciam a
evolução independente das linhagens. Tais observações devem ser investigadas com mais
detalhes a fim de confirmar a existência de espécies crípticas. A análise da diversidade
encontrada no presente estudo forneceu ainda subsídios para pesquisas posteriores que visem
esclarecer sobre a origem de S. octona.<br>Current knowledge of the diversity of terrestrial molluscs does not take into account the intraand
interspecific variability, particularly with regard to species from tropical climates, as is
the case of Subulina octona. The association between morphometric and molecular analysis,
which remain unpublished for studies in S. octona, has allowed the identification of taxa and
understanding of their relationships. In the present study, we observed variability in the shell,
reproductive system, body color and molecular structure based on COI of mitochondrial DNA
between populations of S. octona. Morphometric analysis along development showed that
within-population variability decreased during the development of molluscs and was higher in
populations with two body color phenotypes. The best component to explain the variability in
most of lifetime was the shell length, followed by the opening width. Because the geographic
distance does not explain the variation in shell shape, we believe that there may
be considerable gene flow favored by human activities and that the selection may be shaping
the morphometric patterns in this species. The interpopulation variation in growth patterns
and shell shape in adulthood, even under identical rearing conditions, shows the important
role of genetic determination. The anatomy of reproductive system was similar between
populations, but the morphology was variable between individuals and populations. Within
populations, the male portion of the reproductive system was more variable than the female
portion, as expected for structures that are under sexual selection. Among populations, the
largest difference was observed in the female portion. The reproductive system was more
variable than the shell, but showed interpopulation compatibility for the shape of
structures. Morphometric and body color phenotypic differentiation were not corroborated by
molecular variation since individuals with the same COI haplotype were variable to shell
shape and color head-foot mass. The neutral evolution model of sequences has been accepted
for the samples analyzed even though not all mutations are silent, highlighting the role of drift
in the species evolution. The low variability of some populations may reflect the strong
inbreeding due to low dispersal ability and capacity of selfing species, in spite of gene flow
via passive dispersal by human activities. We observed a genetic structure of populations,
because it presents a unique haplotype and form a distinct lineage in the maximum likelihood
dendrograma. Different lineages showed morphometric differences in reproductive structures,
which show their independent evolution. These observations must be investigated in more
detail to confirm the existence of cryptic species. The analysis of the diversity found in this
study also provided grants for further research aimed at shedding light on the origin of S.
octona.
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New, Evan M. "Aminochronology and Time-averaging of Quaternary Land Snail Assemblages from Colluvial Soils in the Madeira Archipelago." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin153538137669338.
Full textBooks on the topic "Land molluscs"
2
Ramakrishna. Annotated checklist of Indian land molluscs. Zoological Survey of India, 2010.
Find full text
3
Rao, N. V. Subba. Land molluscs of Andaman and Nicobar Islands. Zoological Survey of India, 1991.
Find full text
4
Kerney, M. P. Atlas of the land and freshwater molluscs of Britain and Ireland. Harley Books, 1999.
Find full text
5
Turk, Stella M. Atlas of the land and freshwater molluscs of Cornwall and the Isles of Scilly: With drawings of the species. Environmental Records Centre for Cornwall and the Isles of Scilly, 2001.
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6
Turk, Stella M. Atlas of the land and freshwater molluscs of Cornwall and the Isles of Scilly: With drawings of the species. Environmental Records Centre for Cornwall and the Isles of Scilly, 2001.
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7
Hendricks, Paul. Land mollusk surveys on USFS Northern Region lands. Montana Natural Heritage Program, 2006.
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8
Hendricks, Paul. Land mollusk surveys on USFS Northern Region lands: 2006. Montana Natural Heritage Program, 2007.
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9
Hendricks, P. Surveys and predicted distribution models for land mollusks on USFS Northern Region lands: 2007. Montana Natural Heritage Program, 2008.
Find full text
10
D, Cameron R. A., ed. Pattern and process in land mollusc diversity. Western Australian Museum, 2005.
Find full textBook chapters on the topic "Land molluscs"
1
Burns, Alison. "The Mesolithic Footprints Retained in One Bed of the Former Saltmarshes at Formby Point, Sefton Coast, North West England." In Reading Prehistoric Human Tracks. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60406-6_16.
Full textAbstract:
AbstractIn the early Holocene period, extensive tracts of coastal land were submerged as the climate warmed and meltwaters flooded into the oceans. As the Irish Sea expanded, coastlines altered and large intertidal zones were created as tracts of low-lying land at the tidal margins were gradually submerged. In these areas, reed swamp and saltmarsh formed which, too, were inundated for varying periods of time. However, in the calmer warmer weather of the late spring and summer, birds and mammals were drawn on to the mudflats where they could feed on molluscs, or new reed and sedge shoots, wallow in the cooling mud, drink the brackish water or, for some predators, hunt. The behavioural tendencies of some species are revealed by their footprints which show their engagement within this environment – some breeds moved on to the marshes while others moved away. The humans who shared this landscape understood the opportunities offered by these predictable behaviours. Their trails run along and across those left by many species, leaving a visible network of human and animal activity preserved in the hardened mud. These will be described through an examination of the footprints recorded in three contexts which formed the stratigraphy of a Mesolithic bed at Formby Point in North West England. The persistent return to the mudflats by generations of people reflects an embodied knowledge of this coastal landscape, learnt in childhood and practiced in adulthood. The ability to modify movements in the landscape, to respond to the daily tides, the changing seasons and a fluctuating environment, all suggest a spatial-temporal relationship which not only encompassed a dynamic environment but also the other life that dwelt within it.
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Fransen, Charles H. J. M. "The Influence of Land Barriers on the Evolution of Pontoniine Shrimps (Crustacea, Decapoda) Living in Association with Molluscs and Solitary Ascidians." In Biogeography, Time, and Place: Distributions, Barriers, and Islands. Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6374-9_4.
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Panisi, Martina, Ricardo F. de Lima, Jezreel do C. Lima, et al. "Terrestrial Mollusca of the Gulf of Guinea Oceanic Islands." In Biodiversity of the Gulf of Guinea Oceanic Islands. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06153-0_16.
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AbstractThe oceanic islands of the Gulf of Guinea are known for their remarkable endemic species richness, and the terrestrial Mollusca group is particularly distinctive. This chapter summarizes the exploration and diversity of this group, discussing biogeography, evolution, ecology, and conservation to identify persisting knowledge gaps. Terrestrial malacological studies in the Gulf of Guinea islands started at the end of the eighteenth century but have been intermittent. Recent systematic surveys have continued to find novelties, and the most recent revision lists 96 species, of which 62 are endemic: Príncipe has 40 terrestrial (60% single-island endemic) and five seashore species, São Tomé has 52 terrestrial (50% single-island endemic) and seven seashore species, Annobón has 14 terrestrial species (50% single-island endemic), 3 species are endemic to Príncipe and São Tomé, and 2 are endemic to the three islands. The islands were colonized by diverse “clades” arriving from continental Africa, which is consistent with biogeographical patterns from other taxonomic groups. However, in line with Mollusca dispersal limitations, inter-island colonization seems to be less frequent, while there are multiple cases of speciation within the same island. The land snail assemblage on São Tomé seems to be strongly structured by land-use type: endemics being associated mostly with forest and non-endemics to anthropogenically modified environments. Only 13 species have been recorded across the altitudinal range of São Tomé, suggesting altitude is also essential to determining species distribution. Habitat loss and introduced species are important threats, but so far, only the endemic Archachatina bicarinata has been listed as threatened. Despite recent progress, further studies are still needed to better understand this unique fauna and inform conservation strategies.
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Okoshi, Kenji. "The Effects of Liquefaction, Tsunami, and Land Subsidence on Intertidal Mollusks Following the Great East Japan Earthquake." In Ecological Impacts of Tsunamis on Coastal Ecosystems. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56448-5_12.
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Tsolakos, Konstantinos, George Katselis, and John A. Theodorou. "Massive Molluscan Shell Accumulation on the Sea Side of Land Strips of Amvrakikos Gulf Lagoon Complex (NW Greece)." In Advances in Science, Technology & Innovation. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01683-8_16.
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Taylor, Victoria K., and Martin Bell. "Land mollusc middens." In Molluscs in Archaeology. Oxbow Books, 2017. http://dx.doi.org/10.2307/j.ctvh1dk5s.18.
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Allen, Michael J. "Land snails in archaeology." In Molluscs in Archaeology. Oxbow Books, 2017. http://dx.doi.org/10.2307/j.ctvh1dk5s.7.
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Davies, Paul. "Land and Freshwater Molluscs." In Extinctions and Invasions. Windgather Press, 2010. http://dx.doi.org/10.2307/j.ctv13gvg6k.26.
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Law, Matt. "Numerical approaches to land snail palaeoecology." In Molluscs in Archaeology. Oxbow Books, 2017. http://dx.doi.org/10.2307/j.ctvh1dk5s.9.
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Kerney, Michael. "List of Recorders." In Atlas of Land and Freshwater Molluscs of Britain and Ireland. BRILL, 1999. http://dx.doi.org/10.1163/9789004629738_011.
Full textConference papers on the topic "Land molluscs"
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Cherkasova, E. E., G. V. Lavrentyeva, and B. I. Synzynys. "CALCULATION OF THE HALF-YEAR DOSE OF THE TERRESTRIAL MOLLUSK FRUTICICOLA FRUTICUM." In SAKHAROV READINGS 2022: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2022. http://dx.doi.org/10.46646/sakh-2022-1-325-328.
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The ecocentric strategy of radiation protection involves the expansion of experimental bases of radiation-induced effects in representatives of biota. This paper presents the calculated values of LD50/60 for the terrestrial mollusk F. fruticum after acute irradiation. To conduct a laboratory experiment, the conditions for keeping animals close to their natural habitat were selected. At the same time the mortality of mollusks in the control group remained at zero during the entire experiment. The calculated method of probit analysis using the least squares method was used to determine the LD50/60 index for F. fruticum mollusk of different age groups. Based on calculations, the LD index is 50/60 for three age groups of land mollusks: 118.7 ± 62.2 Gy, 115.6 ±33.9 Gy and 141.4 ±26.3 Gy for the first, second and third age groups, respectively.
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Almeida, Marcelo N., Rodolfo Alves de Oliveira, Luiz Olmes, et al. "HELIX: A data-driven characterization of Brazilian land snails." In Simpósio Brasileiro de Banco de Dados. Sociedade Brasileira de Computação - SBC, 2021. http://dx.doi.org/10.5753/sbbd.2021.17892.
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Decision-support systems benefit from hidden patterns extracted from digital information. In the specific domain of gastropod characterization, morphometrical measurements support biologists in the identification of land snail specimens. Although snails can be easily identified by their excretory and reproductive systems, the after-death mollusk body is commonly inaccessible because of either soft material deterioration or fossilization. This study aims at characterizing Brazilian land snails by morphometrical data features manually taken from the shells. In particular, we examined a dataset of shells by using different learning models that labeled snail specimens with a precision up to 97.5% (F1-Score = .975, CKC = .967 and ROC Area = .998). The extracted patterns describe similarities and trends among land snail species and indicates possible outliers physiologies due to climate traits and breeding. Finally, we show some morphometrical characteristics dominate others according to different feature selection biases. Those data-based patterns can be applied to fast land snail identification whenever their bodies are unavailable, as in the recurrent cases of lost shells in nature or private and museum collections.
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Gaudenyi, Tivadar. "LOESS OF SERBIA—FROM PALEOCLIMATE TO WINEYARDS." In Book of Abstracts and Contributed Papers. Geographical Institute "Jovan Cvijić" SASA, 2024. http://dx.doi.org/10.46793/csge5.05tg.
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Loess is a buff colored, clastic sedimentary rocky of eolian origin without stratification and laminations where the silt particles predominates (beside clay and sand). Gentle lithification with carbonate bonds makes them highly sensitive to water impacts which dissolute this rock. Its vertical breaking made steep slopes. Loess in the sedimentary record deposits are not homogenous sediments, but most contain paleosols or sand horizons which we denominated loess series or loess-paleosol sequences. In Serbia loess series are the most widespread eolian sediments on which the high quality chernozem-like soils are formed. It qualifies as parent rock the premium arable land and wineyards. According to the relief characteristics in the landscape we can distinguish plain loess and slope loess. Based on CaCO 3 content the most of Serbian series belongs to the classic loess series while in the Morava valley at a few places we can found a non-carbonated loess series. Only at Stari Slankamen (Koševac) we can found Lower Pleistocene loess at the other places the young part of Middle Pleistocene or just the Upper Plesitocene loess series are preserved in the sedimentary record. Loess series serve as a record of past climates and environmental conditions. Key aspects of loess and paleoclimate studies include stratigraphy and cyclicity deposits often show distinct layering that corresponds to different climatic periods. Within loess series, paleosols can provide additional information about past climates. The timing of loess deposition often correlates with glacial and interglacial cycles. Loess series can contain various proxies for past climates, such as mollusks, which provides information about past biotope proxies. Analysis of loess can help reconstruct past wind patterns and dust transport routes, offering insights into changes in atmospheric circulation and climate systems over time. The importance of loess studies help reconstruct past environments dynamics and climate conditions, providing a context for understanding past climate variability and change. Data from loess deposits can improve climate models by providing empirical evidence of past climate conditions, which helps refine predictions about future climate changes. Loess deposits have influenced human history by shaping agricultural practices and settlement patterns.
Reports on the topic "Land molluscs"
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Tweet, Justin S., Vincent L. Santucci, Kenneth Convery, Jonathan Hoffman, and Laura Kirn. Channel Islands National Park: Paleontological resource inventory (public version). National Park Service, 2020. http://dx.doi.org/10.36967/nrr-2278664.
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Channel Island National Park (CHIS), incorporating five islands off the coast of southern California (Anacapa Island, San Miguel Island, Santa Barbara Island, Santa Cruz Island, and Santa Rosa Island), has an outstanding paleontological record. The park has significant fossils dating from the Late Cretaceous to the Holocene, representing organisms of the sea, the land, and the air. Highlights include: the famous pygmy mammoths that inhabited the conjoined northern islands during the late Pleistocene; the best fossil avifauna of any National Park Service (NPS) unit; intertwined paleontological and cultural records extending into the latest Pleistocene, including Arlington Man, the oldest well-dated human known from North America; calichified “fossil forests”; records of Miocene desmostylians and sirenians, unusual sea mammals; abundant Pleistocene mollusks illustrating changes in sea level and ocean temperature; one of the most thoroughly studied records of microfossils in the NPS; and type specimens for 23 fossil taxa. Paleontological research on the islands of CHIS began in the second half of the 19th century. The first discovery of a mammoth specimen was reported in 1873. Research can be divided into four periods: 1) the few early reports from the 19th century; 2) a sustained burst of activity in the 1920s and 1930s; 3) a second burst from the 1950s into the 1970s; and 4) the modern period of activity, symbolically opened with the 1994 discovery of a nearly complete pygmy mammoth skeleton on Santa Rosa Island. The work associated with this paleontological resource inventory may be considered the beginning of a fifth period. Fossils were specifically mentioned in the 1938 proclamation establishing what was then Channel Islands National Monument, making CHIS one of 18 NPS areas for which paleontological resources are referenced in the enabling legislation. Each of the five islands of CHIS has distinct paleontological and geological records, each has some kind of fossil resources, and almost all of the sedimentary formations on the islands are fossiliferous within CHIS. Anacapa Island and Santa Barbara Island, the two smallest islands, are primarily composed of Miocene volcanic rocks interfingered with small quantities of sedimentary rock and covered with a veneer of Quaternary sediments. Santa Barbara stands apart from Anacapa because it was never part of Santarosae, the landmass that existed at times in the Pleistocene when sea level was low enough that the four northern islands were connected. San Miguel Island, Santa Cruz Island, and Santa Rosa Island have more complex geologic histories. Of these three islands, San Miguel Island has relatively simple geologic structure and few formations. Santa Cruz Island has the most varied geology of the islands, as well as the longest rock record exposed at the surface, beginning with Jurassic metamorphic and intrusive igneous rocks. The Channel Islands have been uplifted and faulted in a complex 20-million-year-long geologic episode tied to the collision of the North American and Pacific Places, the initiation of the San Andreas fault system, and the 90° clockwise rotation of the Transverse Ranges, of which the northern Channel Islands are the westernmost part. Widespread volcanic activity from about 19 to 14 million years ago is evidenced by the igneous rocks found on each island.
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Salcido, Charles, Patrick Wilson, Justin Tweet, Blake McCan, Clint Boyd, and Vincent Santucci. Theodore Roosevelt National Park: Paleontological resource inventory (public version). National Park Service, 2022. http://dx.doi.org/10.36967/nrr-2293509.
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Theodore Roosevelt National Park (THRO) in western North Dakota was established for its historical connections with President Theodore Roosevelt. It contains not only historical and cultural resources, but abundant natural resources as well. Among these is one of the best geological and paleontological records of the Paleocene Epoch (66 to 56 million years ago) of any park in the National Park System. The Paleocene Epoch is of great scientific interest due to the great mass extinction that occurred at its opening (the Cretaceous–Paleogene extinction event), and the unusual climatic event that began at the end of the epoch (the Paleocene–Eocene Thermal Maximum, an anomalous global temperature spike). It is during the Paleocene that mammals began to diversify and move into the large-bodied niches vacated by dinosaurs. The rocks exposed at THRO preserve the latter part of the Paleocene, when mammals were proliferating and crocodiles were the largest predators. Western North Dakota was warmer and wetter with swampy forests; today these are preserved as the “petrified forests” that are one of THRO’s notable features. Despite abundant fossil resources, THRO has not historically been a scene of significant paleontological exploration. For example, the fossil forests have only had one published scientific description, and that report focused on the associated paleosols (“fossil soils”). The widespread petrified wood of the area has been known since at least the 19th century and was considered significant enough to be a tourist draw in the decades leading up to the establishment of THRO in 1947. Paleontologists occasionally collected and described fossil specimens from the park over the next few decades, but the true extent of paleontological resources was not realized until a joint North Dakota Geological Survey–NPS investigation under John Hoganson and Johnathan Campbell between 1994–1996. This survey uncovered 400 paleontological localities within the park representing a variety of plant, invertebrate, vertebrate, and trace fossils. Limited investigation and occasional collection of noteworthy specimens took place over the next two decades. In 2020, a new two-year initiative to further document the park’s paleontological resources began. This inventory, which was the basis for this report, identified another 158 fossil localities, some yielding taxa not recorded by the previous survey. Additional specimens were collected from the surface, among them a partial skeleton of a choristodere (an extinct aquatic reptile), dental material of two mammal taxa not previously recorded at THRO, and the first bird track found at the park. The inventory also provided an assessment of an area scheduled for ground-disturbing maintenance. This inventory is intended to inform future paleontological resource research, management, protection, and interpretation at THRO. THRO’s bedrock geology is dominated by two Paleocene rock formations: the Bullion Creek Formation and the overlying Sentinel Butte Formation of the Fort Union Group. Weathering of these formations has produced the distinctive banded badlands seen in THRO today. These two formations were deposited under very different conditions than the current conditions of western North Dakota. In the Paleocene, the region was warm and wet, with a landscape dominated by swamps, lakes, and rivers. Great forests now represented by petrified wood grew throughout the area. Freshwater mollusks, fish, amphibians (including giant salamanders), turtles, choristoderes, and crocodilians abounded in the ancient wetlands, while a variety of mammals representing either extinct lineages or the early forebearers of modern groups inhabited the land. There is little representation of the next 56 million years at THRO. The only evidence we have of events in the park for most of these millions of years is isolated Neogene lag deposits and terrace gravel. Quaternary surficial deposits have yielded a few fossils...
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Rich, Megan, Charles Beightol, Christy Visaggi, Justin Tweet, and Vincent Santucci. Vicksburg National Military Park: Paleontological resource inventory (sensitive version). National Park Service, 2023. http://dx.doi.org/10.36967/2297321.
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Vicksburg National Military Park (VICK) was established for its historical significance as a one of the principle military sieges resulting in a turning point during the American Civil War. The steep terrain around the city of Vicksburg was integral in the military siege, providing high vantage points and a substrate that was easy to entrench for the armies, but unknown to many is the fossil content, particularly a diversity of fossil mollusks. These fossils at VICK are important paleontological resources which have yet to receive focused attention from park staff, visitors, and researchers. The park’s geology is dominated by windblown silt from the last Ice Age which overlays river-transported gravels and bedrock of the late Oligocene–early Miocene-age Catahoula Formation or early Oligocene Vicksburg Group. The park is home to the type section (a geological reference locality upon which a formation is based) for the Mint Spring Formation, one of the most fossiliferous formations in this group (Henderson et al. 2022). Beginning roughly 32 million years ago (Dockery 2019), the early Oligocene deposits of the Vicksburg Group were deposited as the sea level along the Gulf Coast shore repeatedly rose and fell. The eponymously named Vicksburg Group is comprised of, from oldest to youngest, the Forest Hill, Mint Spring, Marianna Limestone, Glendon Limestone, Byram, and Bucatunna Formations. Each of these formations are within VICK’s boundaries, in addition to outcrops of the younger Catahoula Formation. Paleozoic fossils transported by the ancestral Mississippi River have also been redeposited within VICK as pre-loess stream gravels. Overlying these layers is the Quaternary-age silt which composes the loess found throughout VICK, meaning the park’s fossils span the entire Phanerozoic Eon. The fossils of VICK consist mostly of near-shore marine Oligocene invertebrates including corals, bryozoans, bivalves, gastropods, scaphopods, ostracods, and more, though terrestrial and freshwater snails of the loess, microfossils, plant fossils, occasional vertebrates, and others can also be found in the park. Notable historical figures such as Charles Alexandre Lesueur, Charles Lyell, and John Wesley Powell all collected fossils or studied geology in the Vicksburg area. The Vicksburg Group is culturally relevant as well, as the Glendon Limestone Formation has been identified by its embedded fossils as a source rock for Native American effigy pipes. This paleontological resource inventory is the first of its kind for VICK. Although Vicksburg fossils have most recently been studied as part of the Gulf Coast Inventory & Monitoring Network (Kenworthy et al. 2007), the park has never received a comprehensive, dedicated fossil inventory before this report. At least 27 fossil species, listed in Appendix B, have been named and described from specimens collected from within VICK’s lands, and VICK fossils can be found at six or more non-NPS museum repositories. Beginning in January 2022, field surveys were undertaken at VICK, covering nearly all the park’s wooded areas, streams, and other portions beyond the preserved trenches and tour road. Fossils were collected or observed at 72 localities. These specimens will be added into VICK’s museum collections, which previously contained no paleontological resources. Considering the minimal attention dedicated to these resources in the past, these newly acquired fossil specimens may be used in the future for educational, interpretive, or research purposes. Future park construction needs should take into account the protection of these resources by avoiding important localities or allowing collection efforts before localities become inaccessible or lost.