Academic literature on the topic 'Delphinus'
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Journal articles on the topic "Delphinus"
1
Oswald, Julie N., Sam F. Walmsley, Caroline Casey, Selene Fregosi, Brandon Southall, and Vincent M. Janik. "Species information in whistle frequency modulation patterns of common dolphins." Philosophical Transactions of the Royal Society B: Biological Sciences 376, no. 1836 (2021): 20210046. http://dx.doi.org/10.1098/rstb.2021.0046.
Full textAbstract:
The most flexible communication systems are those of open-ended vocal learners that can acquire new signals throughout their lifetimes. While acoustic signals carry information in general voice features that affect all of an individual's vocalizations, vocal learners can also introduce novel call types to their repertoires. Delphinids are known for using such learned call types in individual recognition, but their role in other contexts is less clear. We investigated the whistles of two closely related, sympatric common dolphin species, Delphinus delphis and Delphinus bairdii , to evaluate species differences in whistle contours. Acoustic recordings of single-species groups were obtained from the Southern California Bight. We used an unsupervised neural network to categorize whistles and compared the resulting whistle types between species. Of the whistle types recorded in more than one encounter, 169 were shared between species and 60 were species-specific (32 D. delphis types, 28 D. bairdii types). Delphinus delphis used 15 whistle types with an oscillatory frequency contour while only one such type was found in D. bairdii . Given the role of vocal learning in delphinid vocalizations, we argue that these differences in whistle production are probably culturally driven and could help facilitate species recognition between Delphinus species. This article is part of the theme issue ‘Vocal learning in animals and humans’.
2
JAYASANKAR, P., B. ANOOP, VIVEKANANDAN _, et al. "Molecular Identification of Delphinids and Finless Porpoise (Cetacea) from the Arabian Sea and Bay of Bengal." Zootaxa 1853, no. 1 (2008): 57. http://dx.doi.org/10.11646/zootaxa.1853.1.5.
Full textAbstract:
The exact number of extant delphinid species from seas around India is still debated and the lack of adequate field keys and reliable inventory has resulted in misidentification of several species. As a part of a project to develop a molecular taxonomy of cetaceans from this region, partial sequences of mtDNA cytochrome b were generated from accidentally caught/stranded delphinids and finless porpoise. Species were identified by phylogenetic reconstruction of sample sequences with the reference sequences available in portals GenBank (NCBI) and the web-based program DNA Surveillance. A comparison was made with the homologous sequences of corresponding species from other seas of the world. Our molecular investigations allowed us to identify five species of cetaceans from Indian coasts, including Delphinus capensis, previously reported as D. delphis. We detected unique haplotypes in Indo pacific humpbacked dolphin (Sousa chinensis; n = 2) and finless porpoise (Neophocaena phocaenoides; n = 12) from Indian coast. On the other hand, some haplotypes were shared with other regional populations in spinner dolphin (Stenella longirostris; n = 16) and bottlenose dolphin (Tursiops aduncus; n = 3). Common dolphins (Delphinus capensis; n = 2) had both unique and shared haplotypes including one highly divergent sequence.
3
Certain, G., V. Ridoux, O. van Canneyt, and V. Bretagnolle. "Delphinid spatial distribution and abundance estimates over the shelf of the Bay of Biscay." ICES Journal of Marine Science 65, no. 4 (2008): 656–66. http://dx.doi.org/10.1093/icesjms/fsn046.
Full textAbstract:
Abstract Certain, G., Ridoux, V., van Canneyt, O., and Bretagnolle, V. 2008. Delphinid spatial distribution and abundance estimates over the shelf of the Bay of Biscay. – ICES Journal of Marine Science, 65: 656–666. The small delphinid community (bottlenose Tursiops truncatus, common Delphinus delphis, and striped Stenella coeruleoalba dolphins) of the Bay of Biscay (100 000 km2 of continental shelf along the French Atlantic coast) has been studied here by combining strip-transect aerial surveys conducted between 2001 and 2004 and ship-based surveys conducted between 2003 and 2006. Distribution was modelled spatially in relation to several large-scale descriptors of the environment. Highest densities of small delphinids were associated with the shelf break, in particular in two hotspots located in the north and the south of the bay. Using ship-based data, we found strong spatial segregation between common and bottlenose dolphins in spring, with common dolphins associated with coastal areas (and especially river plumes) and bottlenose dolphins on the outer shelf and the shelf break. Assuming a detection probability of 1, a strip-transect abundance estimate for the small delphinid community was obtained in August 2002 with 56 500 (95% CI 29 100–90 400), but relative abundance varied across months.
4
Martínez, Lara, Sebastián Silva, Belén Alcorta, and Aldo S. Pacheco. "First records of the pantropical spotted dolphin Stenella attenuata, within groups of common dolphins Delphinus delphis in northern Peru." Revista de Biología Marina y Oceanografía 56, no. 1 (2021): 78. http://dx.doi.org/10.22370/rbmo.2021.56.1.2801.
Full textAbstract:
Although dolphins are mostly known to form single species groups of varying size, occasionally they aggregate in mixed-species groups. The presence of mixed-species delphinid groups along the Peruvian coast is unknown. Herein, we report the presence of a single pantropical spotted dolphin (Stenella attenuata) within large groups of the common dolphin (Delphinus delphis) at Los Organos in the northern coast of Peru. Sightings occurred on October 10th, 2016, January 7th, 2018 and September 21st, 2019. In one sighting the mixed group was feeding, while during the other two sightings the group was travelling. These records add new evidence about mixed-species delphinid groups in coastal waters of Peru.
5
Botta, Silvina, Aleta A. Hohn, Stephen A. Macko, and Eduardo R. Secchi. "Isotopic variation in delphinids from the subtropical western South Atlantic." Journal of the Marine Biological Association of the United Kingdom 92, no. 8 (2011): 1689–98. http://dx.doi.org/10.1017/s0025315411000610.
Full textAbstract:
A dual stable isotope approach (δ13C and δ15N) was used to investigate inter- and intra-specific variations in feeding ecology and habitat use of 7 delphinids from coastal/estuarine, continental shelf and offshore marine environments from southern Brazil: Tursiops sp., Orcinus orca, Stenella frontalis, Steno bredanensis, Delphinus delphis, Pseudorca crassidens and Lagenodelphis hosei. Teeth from 50 specimens acquired from stranded animals were analysed in this study. Tursiops sp. and O. orca are the most coastal species, and had the highest δ13C values followed by the continental shelf species S. frontalis, S. bredanensis and D. delphis. Lagenodelphis hosei showed the lowest δ13C value, demonstrating its typical offshore habitat. One group of P. crassidens had the lowest δ15N values, indicating their low trophic level feeding habit while two specimens of the same species showed the highest mean nitrogen isotope value. This first study on stable isotope values of delphinids from southern Brazil provides substantial new information about the trophic ecology, habitat use and feeding environments of these animals.
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Buffrénil, V. de, J. Y. Sire, and D. Schoevaert. "Comparaison de la structure et du volume squelettiques entre un delphinidé (Delphinus delphis L.) et un mammifère terrestre (Panthera leo L.)." Canadian Journal of Zoology 64, no. 8 (1986): 1750–56. http://dx.doi.org/10.1139/z86-264.
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The weight and structural characteristics of bones (density, ash content, and structural compactness) were compared between a small delphinid (Delphinus delphis L.) and a terrestrial mammal (Panthera leo L.). The aim of this comparison was to show the morphological correlates of the steep reduction in skeletal mass, which is a characteristic of dolphins. The lightness of the bones in the thoracic limbs of these animals is due to a reduction of both the volume and the density of bones. In the cephalic and thoracic regions, the loss in mass of the delphinid skeleton is due only to the reduction of bone volume. Dolphin vertebrae show no modification of weight or structure, as compared with those of lions. The functional hypotheses suggested by these results are discussed in relation to aspects of bone pathology induced by disuse or abnormal gravitational conditions.
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Melo, C. L. C., R. A. Santos, M. Bassoi, et al. "Feeding habits of delphinids (Mammalia: Cetacea) from Rio de Janeiro State, Brazil." Journal of the Marine Biological Association of the United Kingdom 90, no. 8 (2010): 1509–15. http://dx.doi.org/10.1017/s0025315409991639.
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Stomach content analyses were performed in 28 dolphins stranded between 1994 and 2007 on the beaches of Rio de Janeiro State (23°06′S 44°18′W/22°14′S 41°54′W), Brazil, comprising six delphinid species: Stenella frontalis (N = 10), Steno bredanensis (N = 7), Tursiops truncatus (N = 4), Delphinus delphis (N = 5), Lagenodelphis hosei (N = 1) and Stenella coeruleoalba (N = 1). Fish otoliths and cephalopod beaks were used to identify the prey species and to estimate the original length and weight. Seven different cephalopod species from six families and 15 fish species belonging to 10 families were identified. Although the fish contribution could be underestimated, cephalopods constituted the group of higher importance, revealing that these invertebrates may represent an important source of energy for delphinids in the region. In this context, the squid Loligo plei should be highlighted due to its important contribution. Most preys were coastal and demersal, and such consumption could indicate coastal foraging habits of the quoted dolphin species. Although dolphins consumed many species of prey in common, they fed on different size-classes of prey. The foraging area of the dolphins could be the same region used by fishing operations, which would represent a risk for incidental capture.
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de Buffrénil, V., A. Collet, and M. Pascal. "Ontogenetic development of skeletal weight in a small delphinid, Delphinus delphis (Cetacea, Odontoceti)." Zoomorphology 105, no. 5 (1985): 336–44. http://dx.doi.org/10.1007/bf00312066.
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Belluzzo, Alice, and Olivier Lambert. "A new delphinid from the lower Pliocene of the North Sea and the early radiations of true dolphins." Fossil Record 24, no. 1 (2021): 77–92. http://dx.doi.org/10.5194/fr-24-77-2021.
Full textAbstract:
Abstract. With a remarkable exception for the Mediterranean, the worldwide Pliocene record of true dolphins (Cetacea, Odontoceti, Delphinidae) remains scarce, in stark contrast with the large number of extant species testifying to the evolutionary success of this family. Based on a fragmentary skull discovered in lower Pliocene deposits (Zanclean, 5 to 4.4 Ma) of the Kattendijk Formation in the Antwerp harbour (Belgium, southern margin of the North Sea basin), we describe here a new delphinid species, Pliodelphis doelensis gen. et sp. nov. This small dolphin with cranial dimensions in the range of the short-beaked common dolphin Delphinus delphis can be distinguished from other extinct and extant delphinids by a combination of cranial features including the maxilla being significantly narrower than the premaxilla at a short distance anterior to the antorbital notch in dorsal view, the maximum opening of the mesorostral groove being located at the level of the antorbital notches, a transversely wide and anteroposteriorly long dorsal exposure of the presphenoid anterior to the bony nares, and all dorsal infraorbital foramina being located posterior to the premaxillary foramina. P. doelensis constitutes the first member of the family described from the early Pliocene of the North Sea basin and, for the whole North Atlantic realm, only the third outside the Mediterranean. This new record contributes thus to our understanding of the poorly known Pliocene radiation(s) of true dolphins.
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Bell, CH, CM Kemper, and JG Conran. "Common Dolphins (Delphinus Delphis) In Southern Australia: A Morphometric Study." Australian Mammalogy 24, no. 1 (2002): 1. http://dx.doi.org/10.1071/am02001.
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Examination of 211 Delphinus specimens from the coasts of Western Australia to New South Wales, including Tasmania, was conducted using 62 quantitative and 11 qualitative variables. After refining the dataset, multivariate analyses were performed on 130 cranially mature specimens using 21 cranial variables. MANOVA showed males to be slightly larger than females, but with substantial overlap, allowing analyses to combine genders. UPGMA Cluster Analysis and MDS Ordination showed three largely overlapping groups based on a size gradient. K-means analysis of these groups found no significant differences and confirmed a size gradient. Discriminant analysis of specimens grouped by geography and water depth showed a tendency for large skulls to be from coasts adjacent to deep water and small skulls from shallow water coasts. Cranial measurements were significant, postcranial measurements and features were not. Tooth counts were within the range for D. delphis for all specimens examined. This study confirms genetic evidence for a single continuously variable species (Delphinus delphis Linnaeus, 1758) in southern Australian waters. Compared with either D. delphis or D. capensis from the eastern North Pacific, the skulls of D. delphis in southern Australia were more variable for many characters.
Dissertations / Theses on the topic "Delphinus"
1
Morais, Pinela Ana. "Taxonomy, morphology and distribution of common dolphin, Delphinus delphis (short-beaked form) and Delphinus capensis (long-beaked form), in West African waters = Taxonomía, morfologia y distribución del delfín común, Delphinus delphis (delfín de morro corto) y Delphinus capensis (delfín de morro largo), en aguas del Noroeste Africano." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/326733.
Full textAbstract:
Distinguishing population units of small cetaceans continuously distributed in a widespread area is challenging, but critical for their conservation and management. The common dolphin (genus Delphinus) has a wide distribution range that has led to the differentiation of a number of morphotypes which, until today, remain of unclear taxonomic adscription. In many areas, two morphotypes were initially distinguished and later separated into two species: the long-beaked common dolphin, or Delphinus capensis, and the short-beaked common dolphin, or Delphinus delphis. The general aim of the present thesis is to investigate the taxonomy, morphology, distribution, and habitat use of the common dolphins (genus Delphinus) occurring in the eastern sub-tropical Atlantic Ocean (NW Africa). This area is amongst those most productive in the world. It is characterized by a quasi-permanent upwelling zone that promotes high biological productivity and a highly diverse and abundant fauna of marine mammals. It has been proposed that the short- and long-beaked forms of common dolphins occur sympatrically in this area, a scenario that provides a unique opportunity to discriminate between the two morphotypes and investigate whether differences are of taxonomic relevance. For the present thesis we investigated the local marine trophic network and the relationship between apex predators, as well as the distribution (offshore vs. inshore) and niche segregation (trophic level exploited) of the two common dolphin morphotypes. Additionally, differences in morphology and habitat use between NW Africa common dolphins and those from other areas, particularly from the northeastern and southeastern Atlantic Ocean, were investigated. Because research of intra and inter specific population variability requires a multiplicity of approaches, different methods were used, including stable isotope analyses of carbon (δ13C) and nitrogen (δ15N) in bone, and measurement-based and 'landmark'-based (geometric) morphometric analyses of the skull. The results obtained revealed that most of the marine mammal species distribute in the outer continental shelf and the upper slope, and that common dolphins are rarely distributed inshore, displaying a typical oceanic behaviour. With the exception of baleen whales, common dolphins showed the lowest trophic level of all marine mammals analyzed, despite the fact that there was large variability between individuals in the exploitation of food resources, possibly to adapt to local environmental variations. The presence of both short- and long-beaked morphotypes of common dolphins was confirmed off the coast of NW Africa, with the short-beaked form inhabiting waters closer to coast and feeding at a lower trophic level than the long-beaked form. Morphological analysis of the skull revealed that variation in relative beak length in common dolphins from NW Africa was larger than in other Delphinus populations worldwide; as opposed to other regions, relative rostrum size followed a clinal variation and intermediate ratios were found. There were significant differences between common dolphin populations and species analyzed in the size and shape components of the skull. The skull of the short-beaked morphotype from NW Africa was shorter but broader than that of the long-beaked. However, despite the differences, there is a closer morphological similarity between the short-beaked morphotype of NW Africa and Delphinus delphis, and between the long-beaked morphotype of the same region and Delphinus capensis. We conclude that taxonomic splitting of common dolphins in this area into two putative species should be postponed until further research is conducted because skull differentiation could be related to niche segregation and not to speciation. Furthermore, the above results indicate that the taxonomic model described for the Northeast Pacific should not be generally applied to other areas where the sort- and long-beaked morphotypes co-habit.<br>Distinguir unidades poblacionales de pequeños cetáceos distribuidos de forma continua en un área extensa es fundamental para su conservación y gestión. En el amplio rango de distribución de los delfines comunes se han establecido varios morfotipos de adscripción taxonómica incierta, identificados por la longitud relativa de su morro. En muchas áreas, dos morfotipos fueron distinguidos y más tarde separados en dos especies: el delfín común de morro largo, Delphinus capensis, y el delfín común de morro corto, Delphinus delphis. El objetivo general de la presente tesis es investigar la taxonomía, morfología, distribución, y uso del hábitat del delfín común (género Delphinus) en el este del Océano Atlántico Subtropical (NW África). Se ha propuesto que las formas de delfín común de morro corto y largo ocurren en simpatría en esta área, lo que permite una oportunidad única para discriminar entre los dos morfotipos e investigar si las diferencias son de importancia taxonómica. Los resultados han demostrado una gran variabilidad entre los individuos en la explotación de los recursos alimentarios, posiblemente para adaptarse a las variaciones ambientales locales del ecosistema. La presencia de ambos morfotipos de delfines comunes se confirmó en la costa NW de África; la forma de morro corto habita aguas más cercanas a la costa y se alimenta en un nivel trófico inferior a la de morro largo. El análisis morfológico del cráneo reveló que la variación en la longitud del morro es más grande que en otras poblaciones, con el morfotipo de morro corto presentando un cráneo más corto pero más amplio que él de morro largo. Como era previsible, existe una similitud morfológica más cercana entre el morfotipo de morro corto del NW de África y Delphinus delphis, y entre el de morro largo y Delphinus capensis. La división taxonómica de delfines comunes en dos especies, en esta área, debe posponerse hasta que se realicen más investigaciones, ya que la diferenciación craneal puede estar relacionada con la segregación de nicho y no con la especiación. Además, el modelo taxonómico descrito para el Pacífico Nordeste no debe aplicarse indiscriminadamente a otras áreas donde ambos morfotipos cohabitan.
2
Morais, Pinela Ana. "Taxonomy, morphology and distribution of the common dolphin, Delphinus delphis (short-beaked form) and Delphinus capensis (long-beaked form), in West African waters = Taxonomía, morfologia y distribución del delfín común, Delphinus delphis (delfín de morro corto) y Delphinus capensis (delfín de morro largo), en aguas del Noroeste Africano." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/326733.
Full textAbstract:
Distinguishing population units of small cetaceans continuously distributed in a widespread area is challenging, but critical for their conservation and management. The common dolphin (genus Delphinus) has a wide distribution range that has led to the differentiation of a number of morphotypes which, until today, remain of unclear taxonomic adscription. In many areas, two morphotypes were initially distinguished and later separated into two species: the long-beaked common dolphin, or Delphinus capensis, and the short-beaked common dolphin, or Delphinus delphis. The general aim of the present thesis is to investigate the taxonomy, morphology, distribution, and habitat use of the common dolphins (genus Delphinus) occurring in the eastern sub-tropical Atlantic Ocean (NW Africa). This area is amongst those most productive in the world. It is characterized by a quasi-permanent upwelling zone that promotes high biological productivity and a highly diverse and abundant fauna of marine mammals. It has been proposed that the short- and long-beaked forms of common dolphins occur sympatrically in this area, a scenario that provides a unique opportunity to discriminate between the two morphotypes and investigate whether differences are of taxonomic relevance. For the present thesis we investigated the local marine trophic network and the relationship between apex predators, as well as the distribution (offshore vs. inshore) and niche segregation (trophic level exploited) of the two common dolphin morphotypes. Additionally, differences in morphology and habitat use between NW Africa common dolphins and those from other areas, particularly from the northeastern and southeastern Atlantic Ocean, were investigated. Because research of intra and inter specific population variability requires a multiplicity of approaches, different methods were used, including stable isotope analyses of carbon (δ13C) and nitrogen (δ15N) in bone, and measurement-based and 'landmark'-based (geometric) morphometric analyses of the skull. The results obtained revealed that most of the marine mammal species distribute in the outer continental shelf and the upper slope, and that common dolphins are rarely distributed inshore, displaying a typical oceanic behaviour. With the exception of baleen whales, common dolphins showed the lowest trophic level of all marine mammals analyzed, despite the fact that there was large variability between individuals in the exploitation of food resources, possibly to adapt to local environmental variations. The presence of both short- and long-beaked morphotypes of common dolphins was confirmed off the coast of NW Africa, with the short-beaked form inhabiting waters closer to coast and feeding at a lower trophic level than the long-beaked form. Morphological analysis of the skull revealed that variation in relative beak length in common dolphins from NW Africa was larger than in other Delphinus populations worldwide; as opposed to other regions, relative rostrum size followed a clinal variation and intermediate ratios were found. There were significant differences between common dolphin populations and species analyzed in the size and shape components of the skull. The skull of the short-beaked morphotype from NW Africa was shorter but broader than that of the long-beaked. However, despite the differences, there is a closer morphological similarity between the short-beaked morphotype of NW Africa and Delphinus delphis, and between the long-beaked morphotype of the same region and Delphinus capensis. We conclude that taxonomic splitting of common dolphins in this area into two putative species should be postponed until further research is conducted because skull differentiation could be related to niche segregation and not to speciation. Furthermore, the above results indicate that the taxonomic model described for the Northeast Pacific should not be generally applied to other areas where the sort- and long-beaked morphotypes co-habit.<br>Distinguir unidades poblacionales de pequeños cetáceos distribuidos de forma continua en un área extensa es fundamental para su conservación y gestión. En el amplio rango de distribución de los delfines comunes se han establecido varios morfotipos de adscripción taxonómica incierta, identificados por la longitud relativa de su morro. En muchas áreas, dos morfotipos fueron distinguidos y más tarde separados en dos especies: el delfín común de morro largo, Delphinus capensis, y el delfín común de morro corto, Delphinus delphis. El objetivo general de la presente tesis es investigar la taxonomía, morfología, distribución, y uso del hábitat del delfín común (género Delphinus) en el este del Océano Atlántico Subtropical (NW África). Se ha propuesto que las formas de delfín común de morro corto y largo ocurren en simpatría en esta área, lo que permite una oportunidad única para discriminar entre los dos morfotipos e investigar si las diferencias son de importancia taxonómica. Los resultados han demostrado una gran variabilidad entre los individuos en la explotación de los recursos alimentarios, posiblemente para adaptarse a las variaciones ambientales locales del ecosistema. La presencia de ambos morfotipos de delfines comunes se confirmó en la costa NW de África; la forma de morro corto habita aguas más cercanas a la costa y se alimenta en un nivel trófico inferior a la de morro largo. El análisis morfológico del cráneo reveló que la variación en la longitud del morro es más grande que en otras poblaciones, con el morfotipo de morro corto presentando un cráneo más corto pero más amplio que él de morro largo. Como era previsible, existe una similitud morfológica más cercana entre el morfotipo de morro corto del NW de África y Delphinus delphis, y entre el de morro largo y Delphinus capensis. La división taxonómica de delfines comunes en dos especies, en esta área, debe posponerse hasta que se realicen más investigaciones, ya que la diferenciación craneal puede estar relacionada con la segregación de nicho y no con la especiación. Además, el modelo taxonómico descrito para el Pacífico Nordeste no debe aplicarse indiscriminadamente a otras áreas donde ambos morfotipos cohabitan.
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Moura, Andre Eurico Viola. "Investigating the relative influence of genetic drift and natural selection in shaping patterns of population structure in Delphinids (Delphinus delphis; Tursiops spp.)." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/755/.
Full textAbstract:
Speciation models relying on geographic barriers to limit gene flow gather widespread consensus, but are insufficient to explain diversification in highly mobile marine organisms. Adaptation to different environments has been suggested as an alternative driver for differentiation, particularly in cetaceans. In this study, patterns of population structure at neutral and functional markers were investigated for both common (Delphinus delphis) and bottlenose dolphin (Tursiops spp.), chosen due to high levels of morphological and ecological variation within each genus. Candidate functional markers were selected by investigating signals of positive selection in both mammals and cetaceans. No population structure was found in the European common dolphin for neutral microsatellite loci, in contrast to what is observed in other sympatric cetacean species. The previously described differention of the Eastern Mediterranean Sea population, probably results from a recent human-mediated bottleneck. Functional markers showed almost complete uniformity suggesting purifying selection. One non-synonymous mutation in β-casein and the DQβ1 locus were exceptions, with patterns of population differentiation possibly the result of differences in local selective pressures. Additionally, large mitogenomic sequences were used to investigate the worldwide phylogeography of several ecotypes/species within the genus Tursiops, with a recent biogeographical calibration point being used to calculate divergence times. Good node resolution with high statistical support was achieved, with good separation between most ecotypes in their own lineages. However, the results give no support for a monophiletic Tursiops. Divergence times are clustered in specific geological periods characterized by climatic fluctuations from cold to warmer periods. The Common and bottlenose dolphins exhibit contrasting patterns of population structure in an environment containing few geographical barriers. Such difference is speculated to be related with different feeding ecologies and social structures, although data on such are still limited. Although selection can be detected in the genomes of cetaceans both at the species and population level, current patterns of differentiation are thought to occur mainly due to drift.
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Monteiro, Sílvia Raquel da Silva. "Estudo genético de golfinho comum, Delphinus delphis, na costa centro/norte de Portugal." Master's thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/747.
Full textAbstract:
Mestrado em Biologia<br>A influência antropogénica nas espécies de cetáceos, nomeadamente através
da interacção com as pescas (exploração directa ou acidental), poluição e
degradação de habitat, tem-se revelado uma ameaça à integridade das
populações selvagens de cetáceos a nível mundial. Para legislação de
protecção dos cetáceos torna-se necessário conhecer as populações em
termos genéticos (estrutura e diversidade), a sua ecologia (abundância,
distribuição, taxas de sobrevivência, reprodução, mortalidade e migração) e
morfologia, bem como o impacto das actividades humanas sobre essas
espécies, dados desconhecidos para muitos dos cetáceos que ocorrem em
Portugal. Abordando apenas uma das áreas que se torna essencial conhecer
relativamente a estas espécies para posterior aplicação em estratégias de
gestão e conservação, o presente estudo avaliou o nível de estruturação e
variabilidade genética de golfinho comum de bico curto (Delphinus delphis) no
centro/norte de Portugal, através da análise da região controlo mitocondrial
de animais arrojados nesta área. Dentro desta população, com intenção de
determinar o impacto causado pelas capturas acidentais destes animais em
artes de pesca, com base nos dados obtidos, foi avaliada a existência de
relações entre as capturas acidentais e a estrutura social, analisando as
relações entre haplótipos dos animais capturados.
Numa análise global, com o objectivo de detectar relações com populações
de outras regiões e identificar a origem destes animais, será realizada uma
comparação da população de Portugal centro/norte com sequências
provenientes do Açores, Canárias, Mar Negro e Pacífico.
A análise de variância molecular (AMOVA) revelou a inexistência de
estruturação populacional desta espécie na costa centro/norte de Portugal,
sugerindo um elevado fluxo genético entre os indivíduos. Após uma análise
global, observou-se que a população da área de estudo se enquadra numa
população única a nível do Oceano Atlântico, uma vez que não houve
diferenciação genética entre as populações atlânticas analisadas, sendo a
população do Pacífico a única significativamente divergente.
A análise da informação existente à priori sobre os arrojamentos (ano, mês,
localização, sexo do animal, estado de decomposição do corpo e indício de
captura acidental) em conjugação com os dados genéticos obtidos permitiu
sugerir relações de parentesco, possivelmente mais fortes que a partilha de
linhagem materna, sendo também reforçadas as hipóteses existentes sobre a
organização social desta espécie. Todos os resultados são relacionados com
dados existentes sobre capturas acidentais por arte de pesca, de modo a
alertar sobre a importância da definição de estratégias de gestão e
conservação, bem como sobre a implementação de medidas de mitigação
para apoiar a sustentabilidade de cetáceos.
ABSTRACT: The influence of human activities on cetacean species, including interaction
with fisheries (direct exploitation or bycatch), pollution or habitat degradation,
is considered one of the major threats to cetacean populations worldwide. In
order to implement legislation on cetacean protection, it is necessary to obtain
data on population genetics (structure and diversity), ecology (abundance,
distribution, rates of survival, reproduction, mortality and migration) and
morphology. It is also necessary to assess the impact of human activities on
these wildlife species. However, such data are unavailable for most of the
cetacean species occurring in Portugal. Therefore, the present study assessed
the level of genetic population diversity and structure of short-beak common
dolphin (Delphinus delphis) in the center/north region of Portugal, by analysing
the mitochondrial control region of animals stranded in that geographic area,
thus focusing on an essential subject to any management and conservation
strategy. In this population, the relations between haplotypes of the studied
animals were investigated, aiming at assessing relationships between
accidental captures of common dolphin and their social structure thus
determining the impact of bycatch on the population in the study area.
Furthermore, in a global analysis, samples from center/north of Portugal were
compared with those from Azores, Canary Islands, Black Sea and Pacific
populations in order to investigate the genetic relation between different
populations and identify the origin of these individuals.
The analysis of the molecular variance (AMOVA) revealed the absence of
population structure in Delphinus delphis occurring in the center/north coast of
Portugal, suggesting a high genetic flow between individuals. Overall data lead
to the hypothesis that the center/north Portuguese population is a part of a
single population occurring in the Atlantic Ocean. In fact, there was no genetic
differentiation between the Atlantic regions analysed, the only significantly
divergent population being that from the Pacific.
By integrating data on stranded animals (year and month of stranding,
geographic location, sex, state of decomposition of the body and signs of
bycatch) with the genetic data, parental relationships between some
individuals were suggested, which were probably stronger than a maternal
lineage. The results also reinforced the hypothesised social organization of
this species. All results were compared with available data on common dolphin
bycatch in the Atlantic Ocean, thus emphasising the need to define
management and conservation strategies, as well as to implement mitigation
measures to support the sustainability of wildlife cetacean populations.
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Margarido, Inês Ribeiro. "Contribuição para a avaliação da dieta do golfinho-comum (Delphinus delphis) na costa continental portuguesa." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/15926.
Full textAbstract:
Mestrado em Biologia Marinha<br>O golfinho-comum (Delphinus delphis) é uma das espécies de cetáceos mais abundantes e mais amplamente distribuídas em todo o planeta, sendo a espécie mais abundante ao longo da costa continental portuguesa. Algumas das suas principais presas apresentam um elevado interesse comercial estando por isso, muitas vezes, associado a capturas acidentais em artes de pesca. Contudo, estudos mais recentes sobre os hábitos alimentares desta espécie na costa portuguesa são escassos. Assim, este estudo visa contribuir para a avaliação da ecologia alimentar deste cetáceo na costa portuguesa através de índices de importância numérica, ocorrência e do peso estimado, permitindo descrever a dieta não só em termos qualitativos, mas também em termos quantitativos. Foram examinados os conteúdos estomacais de 55 golfinhoscomuns arrojados na costa continental portuguesa (norte e centro) entre 2004 e 2015. De um total de 6699 presas identificadas, 66% pertenciam à classe dos peixes, 32% eram cefalópodes e 3% eram crustáceos. As espécies-presa de peixes mais importantes em termos de importância numérica foram os góbios (Gobiidae) e o carapau (Trachurus sp.). Em relação à ocorrência foram o góbio (Gobiidae) e a sardinha (Sardina pilchardus), seguidas de carapau, as espécies predominantes. Relativamente ao peso, a sardinha foi a espécie-presa predominante, seguida de faneca (Trisopterus luscus) e carapau. Quanto aos cefalópodes, a lula-bicuda (Alloteuthis sp.) foi a espécie mais importante, tanto em termos de importância numérica como em termos de ocorrência. A lula-comum (Loligo sp.) foi a mais importante em termos de peso total estimado. As espécies demersais dominaram a dieta do golfinho-comum, com uma percentagem numérica de 40%. Foram detetadas diferenças entre machos e fêmeas na composição da dieta relativamente à sardinha. Foram detetadas diferenças entre indivíduos maturos e imaturos na composição da dieta relativamente à lula-bicuda. A diversidade de presas observada nos conteúdos estomacais do golfinho-comum sugere um comportamento oportunista, consumindo as presas mais abundantes, localmente. As interações com as artes de pesca podem levar a uma elevada mortalidade destes mamíferos marinhos. Deste modo, a realização de estudos sobre os hábitos alimentares de cetáceos permitem uma melhor compreensão das possíveis interações com a pesca, e a melhoria de estratégias de conservação para evitar a morte destes animais.<br>The short-beaked common dolphin (Delphinus delphis) is one of the most abundant species of cetaceans and more broadly distributed all over the planet, being the most abundant specie along Portuguese continental coast. Some of the main preys have a high commercial value, therefore this species is associated with fishing bycatch. However, in Portuguese continental waters, recent studies about its feeding habits are scarce. The present study aims to provide information about this species feeding habits along the Portuguese continental coast. Therefore, 55 stomach contents of stranded dead common dolphins along the Portuguese coast, between 2004 and 2015 were analyzed. Quantitative and qualitative dietary information was obtained, using indexes of frequency and occurrence, and estimated weight that allowed determining the relative importance of prey species. The diet of Delphinus delphis consisted mainly of fish (66%), the majority of them commercial species and was also complemented by cephalopods and crustaceans. Gobies (Gobiidae) and horse mackerel (Trachurus sp.) were the most important preys in terms of abundance. The most frequent fish prey were gobies (Family Gobiidae), sardine (Sardina pilchardus) and horse mackerel (Trachurus sp.). In terms of mass importance, sardine was the predominant species followed by pout whiting (Trisopterus luscus) and horse mackerel. The most abundant and frequent species of cephalopod prey was the beaked squid (Allotheuthis sp.). The european squid (Loligo sp.) was the most important species considering total estimated weight. Short beaked common dolphins showed preference for demersal prey (40%), being able to explore various depths and habitats. Differences were detected in diet composition between males and females, relatively to sardine abundance. We also found differences between mature and immature individuals in relation to beaked squid. The diversity of prey observed in stomach contents of common dolphins suggests that this is a top opportunistic and generalist predator, capable of changing its diet according to prey availability, which allows for their worldwide distribution. Interaction with fisheries may lead to high mortality rates of these marine mammals. Therefore, studies about feeding habits of cetaceans provide a better understanding of possible interactions with fisheries, possibly improving strategies to prevent these animals death.
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Gkafas, Georgios Aristidis. "Molecular ecology and fitness of striped (Stenella coeruleoalba, Meyen, 1833) and common (Delphinus delphis, Linnaeus, 1758) dolphins." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/743/.
Full textAbstract:
In this study the molecular ecology and fitness of two Delphinidae species, the striped dolphin (Stenella coeruleoalba) and the common dolphin (Delphinus delphis), were investigated in the Mediterranean Sea and Atlantic Ocean. This thesis provides a comparative assessment of the striped and the common dolphin, using molecular methods regarding the genomic diversity and parasite resistance. The striped and the common dolphin have a world-wide distribution, inhabiting pelagic waters and differ with respect to population structure within the study area. The aim is to reveal different patterns of genetic diversity and fitness in the species that shows greater populations structure. In order to test this, my analyses structure was a) to analyse the population structure of the striped dolphin in the Mediterranean Sea and Atlantic Ocean and compare structuring patterns with previous published studies, b) to examine the heterozygosity fitness correlation for both species, using neutral and non-neutral markers and specific parasites that are important of animal’s health. In this context this study tests that local populations show stronger relationship between genetic diversity and fitness. This study suggested that different methods regarding to power and studied subareas show a fine-scale structure beyond that reported previously in striped dolphin populations. A key new finding is the structuring pattern in the Atlantic Ocean, where populations from Scotland and the Biscay Gulf were isolated from the one in Ireland. Also, the Ionian Sea samples grouped with the western Mediterranean, which could either be an effect of the small sample size from the Ionian Sea, or reflect a boundary closer to Greece, dividing the basins of the Mediterranean for this species. In this study I found differences between the two hosts with respect their genetic diversity and parasite loads for both nuclear and functional loci. I also found that evidence for a heterozygosity fitness correlation was strongest for females, and this was true both for the correlation with genomic diversity as assessed using neutral markers, and for the functional immune system gene. This observable association suggests that parasites may act as an energetic stress, and may reflect the non-identical pathogenesis of parasites and their ability to inflict damage through the hormone profiles. Results illustrate potentially important interactions between genetic drift and selection, and provide specific information that will be valuable towards the conservation and management of diversity in these species.
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Amaral, Karina Bohrer do. "Biogeografia histórica dos golfinhos Delphininae (CETARTIODACTYLA: DELPINIDAE)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/104804.
Full textAbstract:
Delphinidae é a família de cetáceos mais diversa dentre os cetáceos atuais e o agrupamento dos gêneros em subfamílias foi inicialmente baseado na semelhança de caracteres morfológicos. Na primeira análise cladística para o clado Delphinidae, baseada em dados de citocromo b, quatro subfamílias foram propostas. Nesta primeira análise, sugeriu-se que os gêneros Delphinus, Tursiops, Stenella, Lagenodelphis e Sousa deveriam ser incluídos no clado Delphininae. Estudos subsequentes baseados em dados moleculares e morfológicos diferem nas relações propostas entre as espécies e na inclusão do gênero Sousa no clado Delphininae. Devido à incongruência entre as relações filogenéticas baseadas tanto na morfologia quanto em dados de DNA mitocondrial e nuclear, foi proposta a inclusão de todas as espécies pertencentes à subfamília para o gênero Delphinus, sob a justificativa de que a atual taxonomia não reflete a real história evolutiva do grupo. É consenso que a radiação de Delphininae foi um evento rápido e recente iniciado no Plioceno, no qual a divergência das espécies ocorreu ao longo do Pleistoceno. Para compreender os processos envolvidos na evolução de Delphininae, à luz da biogeografia histórica, foi utilizado o método da “Spatial Analysis of Vicariance”, cuja principal meta é identificar taxóns-irmãos com distribuições disjuntas. “Spatial Analysis of Vicariance” (SAV) foi conduzida no “Vicariance Inference Program” (VIP) a partir de duas hipóteses filogenéticas, uma construída a partir de dados moleculares e outra de dados morfológicos. A partir de revisão exaustiva da literatura, 2.637 registros de ocorrência de todos os taxa terminais pertencentes à Delphininae e grupos externos foram compilados. A busca por distribuições disjuntas entre grupos filogeneticamente relacionados foi conduzida através de 1.000 iterações. A grade de células utilizada foi 2°x2° com preenchimento máximo ajustado para 1. O custo atribuído para a remoção total da distribuição do terminal foi 1 e o custo de uma remoção parcial foi ajustado para 0,75. Não foi utilizado percentual de sobreposição. Em ambas análises de vicariância realizadas tanto com dados moleculares quanto morfológicos, foram recuperados eventos vicariantes e diferentes cenários biogeográficos foram hipotetizados. A separação entre Delphininae e Steninae parece estar relacionada ao soerguimento do Istmo do Panamá que ocorreu há 7 – 3,5 Ma e teve grande importância na fragmentação da biota marinha entre os oceanos Pacífico e o Atlântico. As disjunções encontradas em táxons terminais estão principalmente relacionadas à Corrente de Benguela e, também a Barreira do Pacífico Oriental. A corrente de Benguela é um importante sistema de ressurgência dos oceanos, sendo um dos mais produtivos ecossistemas do mundo, cuja oscilação da temperatura, a partir de 3 Ma atrás, promoveu a fragmentação da fauna marinha tropical durante períodos frios, mas permitiu o intercâmbio de faunas entre o Atlântico e o Índico durante períodos mais quentes. Os demais eventos vicariantes encontrados parecem estar relacionados à fragmentação do ambiente costeiro no Atlântico e Indo-Pacífico durante os períodos glaciais e interglaciais do Pleistoceno.
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Tavares, Maurício. "O gênero Delphinus Linnaeus, 1758 (Cetacea, Delphinidae) no litoral brasileiro : morfometria sincraniana, padrão de coloração e distribuição." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/76627.
Full textAbstract:
Os golfinhos-comuns do gênero Delphinus Linnaeus, 1758 encontram-se amplamente distribuídos em águas tropicais, subtropicais e temperadas de todo o mundo. Atualmente são reconhecidas duas espécies de golfinhos-comuns, Delphinus delphis Linnaeus, 1758 (golfinho-comum-de-rostro-curto) e Delphinus capensis Gray, 1828 (golfinho-comum-de-rostro-longo), além de uma terceira forma considerada como subespécie, Delphinus capensis tropicalis (van Bree, 1971). Com o objetivo de avaliar a existência das duas espécies e revisar a distribuição do gênero para o litoral brasileiro, foram avaliados 163 registros provenientes de encalhes, capturas acidentais e avistagens. Ao total, 104 crânios foram analisados morfometricamente e comparados quanto ao dimorfismo sexual, ao habitat e a maturidade. Além disso, foram realizadas comparações morfométricas entre os golfinhos-comuns do Atlântico Sul ocidental e os golfinhos-comuns do Pacífico Norte oriental. Os resultados sugerem a existência de dois grupos no litoral brasileiro, um de hábitos costeiros e outro de hábitos oceânicos, porém as diferenças não são suficientes para a separação em duas espécies distintas como proposto para o Pacífico Norte oriental. Dessa forma, no litoral brasileiro parece ocorrer apenas uma espécie de golfinho-comum (Delphinus delphis) que apresenta grande plasticidade fenotípica e distribui-se desde o litoral oriental, no Estado do Rio de Janeiro (22°S) até a divisa com o Uruguai no litoral sul, no Estado do Rio Grande do Sul.<br>The common dolphins of the genus Delphinus Linnaeus, 1758 are distributed worldwide in tropical, subtropical and temperate waters. Two species are currently recognized Delphinus delphis Linnaeus, 1758 (short-beaked common dolphin) and Delphinus capensis Gray, 1828 (long-beaked common dolphin), and a third morphotype is described as a subspecies Delphinus capensis tropicalis (van Bree, 1971). In order to evaluate the existence of these two species and review the distribution in Brazilian waters, we evaluated 163 records (strandings, incidental catches, and sightings). One hundred and four skulls were analyzed and compared between sexual dimorphism, habitat and maturity. Moreover, Brazilian common dolphins were compared with common dolphins from eastern North Pacific. The results suggest that there are two groups of common dolphins in Brazilian waters, one of them inhabiting shallow waters and another from deeper waters. However, the differences are not enough to propose the existence of two species in Brazilian waters like in the eastern North Pacific. In this manner, Brazilian common dolphins seem to be a single species (Delphinus delphis) presenting a wide phenotipical variation, and is distributed from Rio de Janeiro State (22°S) to the southern boundary with Uruguayan waters, in Rio Grande do Sul State.
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Natoli, Ada. "Molecular ecology of bottlenose (Tursiops sp.) and common (Delphinus sp.) dolphins." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/2983/.
Full textAbstract:
Bottlenose (Tursiops sp.) and common dolphins (Delphinus sp.) are amongst the most common small cetaceans. They both have a world-wide distribution from warm temperate to tropical waters inhabiting pelagic and coastal waters, and they both show high morphological variability throughout their range, leaving the taxonomic issues in both species unresolved. This thesis provides a comparative assessment of these two species, by molecular analysis, especially in the context of comparing coastal and pelagic populations of each species. The aim is to better understand the evolutionary processes and the factors involved in shaping the population structure in small delphinids. The strategy 1 followed was: 1) Analyse the population structure of the bottlenose and common dolphins on a worldwide scale and compare large scale patterns in the context of known similarities and differences with respect to life history. 2) Analyse populations on a smaller geographic scale (Mediterranean Sea and South Africa) to further understand the relationship between habitat and population generic structure. On a worldwide scale, bottlenose dolphins showed high genetic diversity and strong population structure, both between different and similar morphotypes, suggesting limited gene flow. Two populations, of the same morphotype, have diverged considerably to the extent that they should be considered different species. Common dolphins showed lower genetic diversity and weak population structure even over a large geographic range, suggesting higher level of gene flow. However, this species also has similar morphotypes that were genetically differentiated from one another. On a smaller geographic scale, we found a similar pattern of population structure, with the bottlenose dolphin showing higher population divergence than common dolphins. However, both species provided evidence supporting the role of habitat in defining population structure in these species. These findings should facilitate the development of effective conservation and management strategies for these species, especially for the specific case studies for populations in the Mediterranean Sea and off the Natal coast of South Africa.
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Viola, de Moura Andre Eurico. "Investigating the relative influence of genetic dritt and natural selection in shaping patterns of population structure in Delphmids (Delphinus delphis; Tursiops spp.)." Thesis, Durham University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534405.
Full textBooks on the topic "Delphinus"
1
Mayol, Jacques. Homo delphinus: The dolphin within man. Idelson-Gnocchi Publishers, 2000.
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Dizon, Andrew E. Stocks of dolphins (Stenella spp. and Delphinus delphis) in the eastern tropical Pacific: A phylogeographic classification. U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1994.
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United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Certificate of documentation for the vessel "Delphinus II": Report of the Senate Committee on Commerce, Science, and Transportation, on S. 2496. U.S. G.P.O., 1992.
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Royal Horticultural Society (Great Britain), ed. Delphiniums. 2nd ed. Cassell, 1992.
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Society, Royal Horticultural, ed. Delphiniums. Cassell (for) The Royal Horticultural Society, 1990.
Find full textBook chapters on the topic "Delphinus"
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Gilmour, Jess K. "Delphinus." In The Practical Astronomer’s Deep-sky Companion. Springer London, 2003. http://dx.doi.org/10.1007/978-1-4471-0071-3_18.
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Mashkovsky, M. D., and V. V. Churyukanov. "Delphinium Alkaloids." In New Neuromuscular Blocking Agents. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70682-0_16.
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Parajuli, Rabindra, Bishnu Timilsina, Hammad Ahmad Jan, et al. "Delphinium brunonianum Royle Delphinium himalayae Munz Delphinium roylei Munz Delphinium vestitum Wall. ex Royle Ranunculaceae." In Ethnobotany of the Himalayas. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45597-2_79-1.
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Jan, Hammad Ahmad, Hassan Sher, Ikram Ur Rahman, Wahid Hussain, Rainer W. Bussmann, and Narel Y. Paniagua-Zambrana. "Delphinium brunonianum Royle Delphinium himalayae Munz Delphinium roylei Munz Delphinium vestitum Wall. ex Royle Ranunculaceae." In Ethnobotany of the Himalayas. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45597-2_79-2.
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Jan, Hammad Ahmad, Hassan Sher, Ikram Ur Rahman, Wahid Hussain, Rainer W. Bussmann, and Narel Y. Paniagua-Zambrana. "Delphinium brunonianum Royle Delphinium himalayae Munz Delphinium roylei Munz Delphinium vestitum Wall. ex Royle Ranunculaceae." In Ethnobotany of the Himalayas. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57408-6_79.
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Bürge, Elisabeth, Irene Spirgi-Gantert, Irene Spirgi-Gantert, and Barbara Suppé. "Der Delphin." In FBL Klein-Vogelbach Functional Kinetics Ballübungen. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-22070-8_24.
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Spirgi-Gantert, Irene, Markus Oehl, and Elisabeth Bürge. "Der Delphin." In FBL Klein-Vogelbach Functional Kinetics: Ballübungen. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49478-3_26.
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Klein-Vogelbach, Susanne, Irene Spirgi-Gantert, and Barbara Werbeck. "Der Delphin." In Funktionelle Bewegungslehre Ballübungen. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-07342-1_7.
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Azimova, Shakhnoza S., and Anna I. Glushenkova. "Delphinium biternatum Huth." In Lipids, Lipophilic Components and Essential Oils from Plant Sources. Springer London, 2012. http://dx.doi.org/10.1007/978-0-85729-323-7_2193.
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Azimova, Shakhnoza S., and Anna I. Glushenkova. "Delphinium brunonianum Royle." In Lipids, Lipophilic Components and Essential Oils from Plant Sources. Springer London, 2012. http://dx.doi.org/10.1007/978-0-85729-323-7_2194.
Full textConference papers on the topic "Delphinus"
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Giardino, Gisela V., Elena Papale, Martina Gregorietti, et al. "The final call: evidence for stereotyped whistle of one dying common dolphin (Delphinus delphis) in Argentina." In 5th International Conference on the Effects of Noise on Aquatic Life. ASA, 2019. http://dx.doi.org/10.1121/2.0001033.
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THEUNISSEN, E. "D3S - The Delphins Display Design System." In Flight Simulation and Technologies. American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-3556.
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Barbosa, Carlos Eduardo, David S. Souza, Jonice Oliveira, and Jano Moreira De Souza. "Ontology to Recover Delphi's Decisions." In 2015 IEEE International Conference on Systems, Man and Cybernetics (SMC). IEEE, 2015. http://dx.doi.org/10.1109/smc.2015.61.
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Delorme, Delphine. "Modeling Driver Cognition Delphine Delorme." In Driving Assessment Conference. University of Iowa, 2001. http://dx.doi.org/10.17077/drivingassessment.1055.
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Gannier, Alexandre, Sandra Fuchs, and Julie N. Oswald. "Pelagic delphinids of the Mediterranean Sea have different whistles." In 2008 New Trends for Environmental Monitoring Using Passive Systems (PASSIVE 2008). IEEE, 2008. http://dx.doi.org/10.1109/passive.2008.4786982.
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Spegar, Timothy D., David Burke, and Lucille Lavan. "Delphi's Heated Injector Technology: The Efficient Solution for Fast Ethanol Cold Starts and Reduced Emissions." In SAE 2012 World Congress & Exhibition. SAE International, 2012. http://dx.doi.org/10.4271/2012-01-0418.
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Camba, Jorge D., Ana Cosin, and Manuel Contero. "An Evaluation of Formal Strategies to Create Stable and Reusable Parametric Feature-Based 3D Models." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37859.
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In this paper, we present a comparative review of publicly available and professionally accepted CAD modeling strategies and best practices for history-based parametric design that focus on reusability: Delphi’s horizontal modeling, explicit reference modeling, and resilient modeling. Some aspects considered in our study include the rationale to avoid the creation of unnecessary feature interdependencies, the sequence and selection criteria for those features, and the effects of parent/child relations on model reuse. We provide a preliminary evaluation of these strategies using a simple industrial CAD model. We analyze the internal structure of the models by comparing the robustness, flexibility, and complexity of the parametric representation. Finally, we provide a set of general guidelines to identify the best modeling strategy based on the characteristics of the design.
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Bittencourt, Lis, Jose Lailson-Brito, William Soares-Filho, et al. "Mapping delphinid occurrence using a passive acoustic monitoring system towed by an unmanned surface vehicle on the Southeast Coast of Brazil." In 2017 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics). IEEE, 2017. http://dx.doi.org/10.1109/rioacoustics.2017.8349714.
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Tursunkhodjaeva, Firuza, and Farkhad Dzhakhangirov. "Analgesic and anti-Inflammatory Activity of Diterpenoid Alkaloids Isolated from the Central Asian Species of Aconitum and Delphinium Plants." In 1st International Electronic Conference on Medicinal Chemistry. MDPI, 2015. http://dx.doi.org/10.3390/ecmc-1-a007.
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Ratchford, Rebecca A., and Patricia H. Mason. "PREDATION OR SCAVENGING? TOOTH-MARKED DELPHINID VERTEBRAE FROM THE MIOCENE OF THE CALVERT CLIFFS AND LEE CREEK MINE HINT AT POSSIBLE FEEDING HABITS OF CARCHAROCLES MEGALODON." In 67th Annual Southeastern GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018se-313231.
Full textReports on the topic "Delphinus"
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Romero, M. Alejandra, Ricardo Bastida, Roc�o LoizagadeCastro, and Guillermo Svendsen. Delphinus delphis. En: SAyDS�SAREM (eds.) Categorizaci�n 2019 de los mam�feros de Argentina seg�n su riesgo de extinci�n. Lista Roja de los mam�feros de Argentina, 2019. http://dx.doi.org/10.31687/saremlr.19.183.
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Turner, Jill. Cytogenetics of Delphinium (Ranunculaceae) Species Native to Oregon. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.6450.
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Root, K. G. Reinterpretation of the age of a succession of paleozoic strata, Delphine Creek, southeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120196.
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Bailey, Taylor. Delphinids on Display: The Capture, Care, and Exhibition of Cetaceans at Marineland of the Pacific, 1954-1967. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.6434.
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Wright, Kirsten. Collecting Plant Phenology Data In Imperiled Oregon White Oak Ecosystems: Analysis and Recommendations for Metro. Portland State University, 2020. http://dx.doi.org/10.15760/mem.64.
Full textAbstract:
Highly imperiled Oregon white oak ecosystems are a regional conservation priority of numerous organizations, including Oregon Metro, a regional government serving over one million people in the Portland area. Previously dominant systems in the Pacific Northwest, upland prairie and oak woodlands are now experiencing significant threat, with only 2% remaining in the Willamette Valley in small fragments (Hulse et al. 2002). These fragments are of high conservation value because of the rich biodiversity they support, including rare and endemic species, such as Delphinium leucophaeum (Oregon Department of Agriculture, 2020). Since 2010, Metro scientists and volunteers have collected phenology data on approximately 140 species of forbs and graminoids in regional oak prairie and woodlands. Phenology is the study of life-stage events in plants and animals, such as budbreak and senescence in flowering plants, and widely acknowledged as a sensitive indicator of environmental change (Parmesan 2007). Indeed, shifts in plant phenology have been observed over the last few decades as a result of climate change (Parmesan 2006). In oak systems, these changes have profound implications for plant community composition and diversity, as well as trophic interactions and general ecosystem function (Willis 2008). While the original intent of Metro’s phenology data-collection was to track long-term phenology trends, limitations in data collection methods have made such analysis difficult. Rather, these data are currently used to inform seasonal management decisions on Metro properties, such as when to collect seed for propagation and when to spray herbicide to control invasive species. Metro is now interested in fine-tuning their data-collection methods to better capture long-term phenology trends to guide future conservation strategies. Addressing the regional and global conservation issues of our time will require unprecedented collaboration. Phenology data collected on Metro properties is not only an important asset for Metro’s conservation plan, but holds potential to support broader research on a larger scale. As a leader in urban conservation, Metro is poised to make a meaningful scientific contribution by sharing phenology data with regional and national organizations. Data-sharing will benefit the common goal of conservation and create avenues for collaboration with other scientists and conservation practitioners (Rosemartin 2013). In order to support Metro’s ongoing conservation efforts in Oregon white oak systems, I have implemented a three-part master’s project. Part one of the project examines Metro’s previously collected phenology data, providing descriptive statistics and assessing the strengths and weaknesses of the methods by which the data were collected. Part two makes recommendations for improving future phenology data-collection methods, and includes recommendations for datasharing with regional and national organizations. Part three is a collection of scientific vouchers documenting key plant species in varying phases of phenology for Metro’s teaching herbarium. The purpose of these vouchers is to provide a visual tool for Metro staff and volunteers who rely on plant identification to carry out aspects of their job in plant conservation. Each component of this project addresses specific aspects of Metro’s conservation program, from day-to-day management concerns to long-term scientific inquiry.