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Dissertations / Theses on the topic 'Snails'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Clark, Stephanie A. "Systematics, spatial analysis and conservation genetics of Meridolum corneovirens (Pfeiffer, 1851) and related forms (Gastropoda: Camaenidae) from the Sydney region of Australia." Thesis, View thesis, 2005. http://handle.uws.edu.au:8081/1959.7/640.

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The purpose of the present study is to examine the genetic and morphological variation found in narrow-range endemic terrestrial invertebrate species at different geographic scales, and the ramifications of this for their systematics, management and conservation. The listed endangered land snail Meridolum corneovirens and several related forms are restricted to the Sydney region, and were used to address the above issues. Morphological, anatomical, allozyme and DNA data were obtained for a total of 77 populations from across the known range of Meridolum. A particular emphasis was placed on the

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2

Clark, S. A. (Stephanie Ann), University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Systematics, spatial analysis and conservation genetics of Meridolum corneovirens (Pfeiffer, 1851) and related forms (Gastropoda: Camaenidae) from the Sydney region of Australia." THESIS_CSTE_SFH_Clark_S.xml, 2005. http://handle.uws.edu.au:8081/1959.7/640.

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The purpose of the present study is to examine the genetic and morphological variation found in narrow-range endemic terrestrial invertebrate species at different geographic scales, and the ramifications of this for their systematics, management and conservation. The listed endangered land snail Meridolum corneovirens and several related forms are restricted to the Sydney region, and were used to address the above issues. Morphological, anatomical, allozyme and DNA data were obtained for a total of 77 populations from across the known range of Meridolum. A particular emphasis was placed on the

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3

Ho, Wai-hoong. "The taxonomy and ecology of land snails in Hong Kong, with particular reference to factors affecting their distribution and population dynamics /." Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20667012.

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4

Montano-Rendon, Mauricio. "Phylogeography of littorinid snails." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13328/.

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Interactions between evolutionary forces such as natural selection, genetic drift and gene flow are complex. Natural selection can lead to parallel formation of phenotypes under similar environmental conditions. Phylogenetic relationships can be inferred from the accumulation of genetic variation caused by genetic drift, regardless of phenotypes. Gene flow between populations can sometimes facilitate the formation of species by natural selection. In this thesis, two groups of marine snails in the diverse subfamily Littorininae were studied. The three rocky-shore species Littorina saxatilis, Li

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5

Clark, Stephanie A. "Systematics, spatial analysis and conservation genetics of Meridolum corneovirens (Pfeiffer, 1851) and related forms (Gastropoda: Camaenidae) from the Sydney region of Australia /." View thesis, 2005. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20051019.154748/index.html.

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6

Pinchuck, Shirley Clare. "The ultrastructure and histology of the defensive epidermal glands of some marine pulmonates." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005481.

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Histology and electron microscopy were used to describe and compare the structure of the dorso-lateral pedal defensive glands of three species of marine Basommatophora, Siphonaria capensis, S. serrata and S. gigas. All three species possessed multi-cellular glands that were larger and most abundant in S. capensis. In S. capensis and S. serrata, defensive glands were composed of two types (type I and II) of large secretory cells filled with product and some irregularly shaped support cells that surrounded a central lumen. The product of both cell types was produced by organelles confined to the

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7

Fearon, Janine Lee. "The genetic diversity and conservation biology of the rare terrestrial snail genus Prestonella." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1003760.

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Prestonella bowkeri and Prestonella nuptialis are montane specialists endemic to the southern Great Escarpment of South Africa. Phylogeographic analyses of these species based on mitochondrial markers CO1 and 16S reveal extremely high levels of divergence between populations indicating a lack of gene flow between populations. This is not surprising, because P. nuptialis and P. bowkeri have limited dispersal capacity, low vagility, a highly fragmented distribution and are habitat specialists that are restricted to isolated mesic refugia associated with waterfalls and montane seepages. A relaxed

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8

Rupp, Jens C. "Mate choice and parasitism in freshwater snails." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339354.

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9

Shigemiya, Yusuke. "Evolution of colour polymorphism in neritid snails." Kyoto University, 2004. http://hdl.handle.net/2433/147702.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第10943号<br>人博第230号<br>15||185(吉田南総合図書館)<br>新制||人||58(附属図書館)<br>UT51-2004-G790<br>京都大学大学院人間・環境学研究科環境相関研究専攻<br>(主査)教授加藤真, 教授松井正文, 助教授宮下英明<br>学位規則第4条第1項該当

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10

Tang, Simon. "Studies on molluscicidal compounds from Phytolacca dodecandra ('Endod') and Millettia thonningii." Thesis, King's College London (University of London), 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284415.

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11

Pedder, Sibella Margaretha. "The actions of neuroactive peptides on identified central neurons of Helix aspersa." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302340.

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12

Cadogan, Anna-Karina. "Characterization of 5-hydroxytryptamine receptors in the snail, Helix aspersa." Thesis, University of St Andrews, 1992. http://hdl.handle.net/10023/14627.

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The aim of this investigation was to characterize those 5-HT receptors present in three different tissues of the common garden snail. Helix aspersa, into one or more of the categories already described for vertebrate 5-HT receptors. Specific 5-HT receptor agonists and antagonists which had been developed and used to help characterize, and subsequently classify, the various types of 5-HT receptor in vertebrates, were utilized in this study. The three preparations from Helix included: i) identified neurones in the visceral ganglion ii) the heart and iii) the pharyngeal retractor muscle (PRM). Th

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13

Underwood, G. J. C. "Interactions between freshwater pulmonate snails, macrophytes and epiphytes." Thesis, University of Sussex, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518005.

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14

Ash, V. B. "Resistance to shell breaking in two intertidal snails." Thesis, University of York, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379538.

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15

Manning, Shawn David. "Susceptibility of Zimbabwean highveld snails to Schistosome infection." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670270.

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16

Peters, Howard. "Cone snails : a significant biomedical resource at risk." Thesis, University of York, 2013. http://etheses.whiterose.ac.uk/5101/.

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Gastropod molluscs of the genus Conus (cone snails) occur throughout the world’s tropical coastal waters where they capture their prey of fish, molluscs or worms using a complex battery of neurotoxins. Although these toxins are of major importance to biomedical science, the conservation status of Conus has been largely ignored. I assessed 632 species of Conus to the standards of IUCN Red List of Threatened Species. This revealed 10.6% of species globally are either threatened or near threatened with extinction, with a further 13.8% data deficient but with indicators that suggest substantial ca

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17

Soomro, Noor Mohammad. "Pathology of schistosome infection in mice and vector snails." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321436.

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18

Hoso, Masaki. "Handedness coevolution : predator-prey interaction drives speciation in snails." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136933.

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19

Ho, Wai-hoong, and 何慧紅. "The taxonomy and ecology of land snails in Hong Kong, with particular reference to factors affecting their distribution and populationdynamics." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211458.

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20

Tomba, Abbie Marie Feminella Jack W. "Effects of trematode parasites on habitat use and disturbance response of freshwater snails in the genus Elimia." Auburn, Ala., 2006. http://repo.lib.auburn.edu/Send%2012-15-07/TOMBA_ABBIE_52.pdf.

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21

Exton, Samantha Jane. "Natural selection in fossil and recent molluscs." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366482.

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22

Campbell, Gillian. "Molecular evolution and population genetics of Biomphalaria (Mollusca: Gastropoda)." Thesis, University of Aberdeen, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275031.

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23

Hanley, Michael Edward. "The influence of molluscan herbivory on seedling regeneration in grassland." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296377.

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24

Ribeiro, Maria JoseÌ Braga Marques. "Molecular mechanisms of appetitive learning in the pond snail Lymnaea stagnalis." Thesis, University of Sussex, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247995.

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25

Babiker, Ismail Elsheikh. "Evaluation of various biomanipulations aimed at controlling freshwater pulmonate snails." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332587.

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26

Leone, Stacy E. "Predator induced plasticity in barnacle shell morphology /." Abstract Full Text (HTML) Full Text (PDF), 2008. http://eprints.ccsu.edu/archive/00000496/02/1952FT.htm.

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Thesis (M.A.) -- Central Connecticut State University, 2008.<br>Thesis advisor: Jeremiah Jarrett. "... in partial fulfillment of the requirements for the degree of Master of Arts in Biology." Includes bibliographical references (leaves 27-29). Also available via the World Wide Web.

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27

Wheater, C. P. "Feeding strategies in some predacious Coleoptera." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253705.

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28

Crossley, Michael. "Neural mechanisms of decision making in the pond snail Lymnaea stagnalis." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/48861/.

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The aim of this thesis was to identify key neural mechanisms underlying decision making in a model invertebrate system, the pond snail Lymnaea stagnalis. Specifically, this was examined with respect to two decision making processes associated with Lymnaea's feeding behaviour; first a stimulus present/stimulus absent perceptual decision making task for selecting between appetitive and consummatory behaviours, second a behavioural choice between ingestion and egestion. A behavioural paradigm was designed in order to study stimulus present and stimulus absent decision making in Lymnaea. The switc

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29

Ciparis, Serena. "Evaluation of the relationships between watershed-scale land use and contaminants in aquatic environments and the use of freshwater snails as indicators of impairment." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/37815.

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The use of manure from animal feeding operations (AFOs) as fertilizer on agricultural land may introduce contaminants to aquatic environments that can negatively affect the health of aquatic organisms. This study utilized a landscape-scale regression-based design to assess the effects of AFOs on contaminant concentrations and resident populations of a pleurocerid snail, Leptoxis carinata, in streams within the Shenandoah River watershed (Virginia, USA). Individual characteristics of L. carinata were also evaluated to provide further understanding of observed population characteristics. In str

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30

Whitwam, Ross Edward Carleton University Dissertation Biology. "The Covalent modification of phosphofructokinase and pyruvate kinase in the hypometabolic pulmonate Otala Lactea." Ottawa, 1988.

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31

Kistner, Erica Jean. "Adaptive responses and invasion the role of plasticity and evolution in snail shell morphology /." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Spring2009/e_kistner_042509.pdf.

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Thesis (M.S. in zoology)--Washington State University, May 2009.<br>Title from PDF title page (viewed on Oct. 09, 2009). "School of Biological Sciences." Includes bibliographical references (p. 77-82).

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32

Raymond, Katherine Mary. "Studies on the inter-relationships between Schistosoma species and bulinid snails." Thesis, Bangor University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302958.

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33

White, Jessica C. "Comparative Bioavailability of Dietary and Dissolved Cadmium to Freshwater Aquatic Snails." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4351/.

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Heavy metal bioaccumulation in aquatic organisms may occur through direct or indirect uptake routes. Research indicates that the significance of uptake route varies with contaminant and organism exposed. The relative importance of different metal sources in aquatic systems was investigated by exposing freshwater snails to dietary or dissolved sources of cadmium. Snails were exposed to control, contaminated food only, contaminated water only, and contaminated food and water treatments. During the 15-day exposure, samples were taken to determine Cd concentration in snail soft tissue, snail sh

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34

Al-Qattan, Nasser M. E. N. A. A. "Interpretation of Oxygen Isotopic Values (d18O) of North American Land Snails." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1404460805.

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35

Lee, Jacqueline S. "The distribution and ecology of the freshwater molluscs of northern British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0033/MQ62481.pdf.

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36

Chebli, Vivian-Azar. "Proteins of Ilyanassa obsoleta embryos : analysis of delobed embryos and isolated polar lobes." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61906.

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37

Ledger, Mark Edward. "Invertebrate grazing of biofilm in streams of contrasting pH." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266219.

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38

Yeung, Chee-yu Alex, and 楊智羽. "Population dynamics and secondary production of a dominant molluscan primary consumer, Sulcospira hainanensis (gastropoda : pachychilidae),in Hong Kong streams and their implications for benthic productivity: y Yeung Alex Chee Yu." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B5043455X.

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The lack of any measurements of the secondary production of the prosobranch snail Sulcospira hainanensis (Bröt, 1872) (Pachychilidae), an abundant primary consumer in Hong Kong streams, represents a major gap in our knowledge of the magnitude of benthic productivity in these systems where S. hainanensis constitutes a substantial proportion of community biomass. This study investigated the population dynamics and production of S. hainanensis between February 2011 and February 2012 in 4 Hong Kong streams (2 unshaded and 2 shaded). Annual production by amphibiotic insects was also quantified by

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39

Riley, Elizabeth M. "Interactions between helminth parasites and molluscs." Thesis, University of Aberdeen, 1990. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU545967.

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Interactions between two digenean parasites, Diplostomum spathaceum and Schistosoma mansoni , and their respective intermediate snail hosts, Lymnaea stagnalis and Biomphalaria glabrata , were investigated. D.spathaceum infections in juvenile L.stagnalis became patent 9 to 10 weeks post-infection and inhibited initiation of host oviposition. Adult L.stagnalis resisted infection with D.spathaceum . Both juvenile and adult B.glabrata were susceptible to S.mansoni and the infections become patent 5 weeks after infection. B.glabrata infected as juveniles failed to begin egg-laying whilst those infe

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40

Orton, R. A. "The life-history strategies of two species of stream-dwelling freshwater snails." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379698.

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41

Ip, Chi Ho. "Molecular evolution of egg perivitelline fluid proteins in apple snails (ampullariidae, caenogastropoda)." HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/718.

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Gastropods are a highly diverse clade of molluscs that includes limpets, snails and slugs, and the only molluscan lineage with members that have successfully colonized land. Amphibious operculate freshwater gastropods, Ampullariidae, exhibit various morphological and physiological adaptations to their respective habitats, which make them ideal candidates for studying the mechanisms underlying adaptive evolution in gastropods. In the last two decades, there have been interests in the diverse reproductive behaviors of ampullariids: while most genera of apple snails deposit their eggs in a jelly

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42

Griggs, Jennifer Lynn. "Effects of Atrazine and Metolachlor on Snails, Tadpoles, and Their Trematode Parasites." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/36122.

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The widespread use and subsequent release of pesticides into aquatic environments have sparked concerns about how organisms within these aquatic systems are affected by pesticide pollution. While many studies have examined the effects of pesticides on individual organisms, in a series of experiments, I investigated the effects of a pesticide mixture on members of a complex host-parasite system and on host susceptibility to infection. In my first experiment in the laboratory, I examined changes in survivorship when trematode parasites (Echinostoma trivolvis) and their first intermediate host, P

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43

Manker, Jaclyn R. "North American Freshwater Snails as Paleoecologic Proxies in Crystal Lake, Medway, Ohio." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1630342940519865.

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44

Gouveia, Ana Rita Peres Cardoso. "Investigation of the factors affecting the population dynamics of captive Partula snails." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9257.

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Partula snails, also known as Polynesian tree snails, were first recorded scientifically from Captain Cook's voyage 236 years ago. They are small gastropod molluscs which belong to the order Stylommatophora. Their distribution is focused in the Pacific region where the majority of the species are island endemics. Half the species are found in the Society Islands of French Polynesia where most research has been carried out. Wild populations were almost annihilated following the introduction of a predatory snail, Euglandina rosea, to control the introduced giant African land snail (Lissachatina

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45

Williams, Emily Rose-Margaret. "Parasites and the ecological undead: marine snails and their suite of trematodes." Thesis, The University of Sydney, 2012. https://hdl.handle.net/2123/28920.

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The invisible interactions between parasites and their hosts are important elements of the ecology and biology of host populations. Parasites can shape the morphology, distribution, physiology and behaviour of individual hosts - some commonly studied host-parasite interactions often involve gastropods and trematodes. Trematodes can have detrimental effects on their snail hosts, yet many such relationships are relatively unknown. One such relationship is that of the mud whelks, Velacumantus australis, many of which are infected by several species of parasitic trematode. Australian estuaries and

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46

Naranjo-Garcia, Edna. "Systematics and biogeography of the Helminthoglyptidae of Sonora." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184460.

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A study of the Helminthoglyptidae of Sonora was undertaken to determine the extent of their distribution and speciation. As a result, nine new species of Sonorella are described, and new ranges of the known species are given. The status of the family is reviewed and its standing is supported with the analysis of morphological characteristics of several genera. The zoogeography of the family and its distribution are shown. Possible dispersal and isolation mechanisms are discussed in order to explain the present distribution of these snails, and comments on ecological and speciation accounts are

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47

Karlsson, Malin. "Analysis of Polycyclic Aromatic Hydrocarbons in Freshwater Snails of Family Lymnaeidae from Patholmsviken." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-46338.

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Polycyclic aromatic compounds (PAHs) are a group of organic compounds that are very stable and therefore persistent. They can be pyrogenic or petrogenic and PAHs from petrogenic sources are often enriched with alkylated PAHs while pyrogenic sources often contain more of the parent PAH. In Patholmsviken, a bay located near an abandoned woodimpregnating facility, freshwater snails were collected and analysed for PAH16, alkylated PAHs, oxy-PAHs and azaarenes using GC/MS. The concentrations of PAH16 were compared with previous analyses and the results showed that the levels had declined since 2008

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48

Reilly, Stephanie A. "Forecasting the Spread and Invasive Potential of Apple Snails (Pomacea spp.) in Florida." NSUWorks, 2017. http://nsuworks.nova.edu/occ_stuetd/460.

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Forecasting the potential range of invasive species is a critical component for risk assessment, monitoring, and management. However, many of these invasive species are not yet at equilibrium which can be problematic for many modelling approaches. Using the climate matching method, MaxEnt, a series of species distribution models (SDMs) and risk analysis maps were created for select apple snail species in Florida: Pomacea canaliculata, P. diffusa, and P. maculata. Apple snails, freshwater gastropods in the family Ampullariidae, are native to South America and were introduced to the United State

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49

Daldorph, Peter W. G. "The role of short chain carboxylic acids in the ecology of freshwater snails." Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.568229.

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50

Standley, Claire J. "Schistosoma mansoni and Biomphalaria snails in Lake Victoria : distribution, genetics and ecological dynamics." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/29867/.

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Intestinal schistosomiasis, caused by the trematode parasite Schistosoma mansoni, is a disease of major public health importance in the Lake Victoria region. Accurate information pertaining to the disease's distribution can greatly assist in the maintenance and realignment of existing control strategies. Rapid mapping of disease prevalence is reliant on diagnostic technologies; in the case of intestinal schistosomiasis, traditional stool-based methods are beginning to be complimented with new, rapid diagnostic tools. However, these require extensive validation, in a variety of settings, to det

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