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20 results for “Stenella”
Fig 2. Three dwarf spinner dolphins, Stenella l in Cetacean Diversity And Habitat Preferences In Tropical Waters Of East Kalimantan, Indonesia
Fig 2. Three dwarf spinner dolphins, Stenella l. roseiventris with obscure, lateral color pattern, photographed in the Berau Archipelago, October 2003. Photo: Budiono.
Data from: Structure and phylogeography of two tropical predators, spinner (Stenella longirostris) and pantropical spotted (S attenuata) dolphins, from SNP data
Little is known about global patterns of genetic connectivity in pelagic dolphins, including how circumtropical pelagic dolphins spread globally following the rapid and recent radiation of the subfamily delphininae. In this study, we tested phylogeographic hypotheses for two circumtropical species, the spinner dolphin (Stenella longirostris) and the pantropical spotted dolphin (Stenella attenuata), using >3,000 nuclear DNA single nucleotide polymorphisms (SNPs) in each species. Analyses for population structure indicated significant genetic differentiation between almost all subspecies and populations in both species. Bayesian phylogeographic analyses of spinner dolphins showed deep divergence between Indo-Pacific, Atlantic, and eastern tropical Pacific Ocean (ETP) lineages. Despite high morphological variation, our results show very close relationships between endemic ETP spinner subspecies in relation to global diversity. The dwarf spinner dolphin is a monophyletic subspecies nested within a major clade of pantropical spinner dolphins from the Indian and western Pacific Ocean populations. Population-level division among the dwarf spinner dolphins was detected–with the northern Australia population being very different from that in Indonesia. In contrast to spinner dolphins, the major boundary for spotted dolphins is between offshore and coastal habitats in the ETP, supporting the current subspecies-level taxonomy. Comparing these species underscores the different scale at which population structure can arise, even in species that are similar in habitat (i.e., pelagic) and distribution.
Seascape genetics of the Atlantic spotted dolphin (Stenella frontalis) based on mitochondrial DNA
<p>The Atlantic spotted dolphin (Stenella frontalis) is endemic to tropical, subtropical, and warm temperate waters of the Atlantic Ocean. Throughout its distribution, both geographic distance and environmental variation may contribute to population structure of the species. In this study we follow a seascape genetics approach to investigate population differentiation of Atlantic spotted dolphins based on a large worldwide dataset and the relationship with marine environmental variables. The results revealed that the Atlantic spotted dolphin exhibits population genetic structure across its distribution based on mitochondrial DNA control region (mtDNA-CR) data. Analyses based on the contemporary landscape suggested, at both the individual and population-level, that the population genetic structure is consistent with the isolation-by-distance model. However, because geography and environmental matrices were correlated, and because in some, but not all analyses, we found a significant effect for the environment, we cannot rule out the addition contribution of environmental factors in structuring genetic variation. Future analyses based on nuclear data are needed to evaluate whether local processes, such as social structure and some level of philopatry within populations, may be contributing to the associations among genetic structure, geographic, and environmental distance.</p>
Seascape genetics of the Atlantic spotted dolphin (Stenella frontalis) based on mitochondrial DNA
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Data from: Structure and phylogeography of two tropical predators, spinner (Stenella longirostris) and pantropical spotted (S attenuata) dolphins, from SNP data
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On following pages: 19. Striped Dolphin (Stenella coeruleoalba); 20. Atlantic Spotted Dolphin (Stenella frontalis); 21. Spinner Dolphin (Stenella longirostris); 22. Rough-toothed Dolphin (Steno bredanensis). in Delphinidae
On following pages: 19. Striped Dolphin (Stenella coeruleoalba); 20. Atlantic Spotted Dolphin (Stenella frontalis); 21. Spinner Dolphin (Stenella longirostris); 22. Rough-toothed Dolphin (Steno bredanensis).
Figure 6 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 6. Scopaegorgia liouvillei comb. nov., holotype (MNHN Oct.0000–0233): (A) body scales; (B) coenenchymal scales.
Figure 5 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 5. Scopaegorgia liouvillei comb. nov., holotype (MNHN Oct.0000–0233): (A) opercular scales; (B) marginal scales.
Figure 4 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 4. Scopaegorgia liouvillei comb. nov., holotype (MNHN Oct.0000–0233). Whorl on abaxial view, stereo pair.
Figure 8 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 8. Fannyella abies, holotype (B970): (A) whorl of polyps, stereo pair; (B) whorl on oral view, stereo pair; (C) polyp on outer-lateral view; (D) polyp on adaxial view.
Figure 11 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 11. Bottlebrush colony shape variability in Fannyella abies: (A) CRO-0049, preserved material; (B) MNA 2463, living material; (C) CRO-0048, living material.
Figure 7 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 7. Fannyella abies, holotype (B970): (A) detail of a brachlet; (B) whole colony. Photo: Åse Wilhelmsen NHM, Oslo.
Figure 1 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 1. Distribution of Primnoid species examined in this paper: circle, Scopaegorgia liouvillei comb. nov.; square, Fannyella abies. Empty symbols represent the respective holotypes.
Figure 2 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 2. Scopaegorgia liouvillei comb. nov., holotype (MNHN Oct.0000–0233): (A) whole colony; (B) detail of a whorl. Photo: Aude Andouche, MNHN, Paris.
Data from: The importance of spinner dolphin (Stenella longirostris) resting habitat: implications for management
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Data from: Chronic exposure of Hawaii Island spinner dolphins (Stenella longirostris) to human activities
Habitat selection is strongly influenced by spatial variations in habitat quality and predation risk. Repeated exposure of wildlife to anthropogenic activities in important habitats may affect habitat selection, leading to negative biological consequences. We quantified the cumulative human exposure of a small, genetically-isolated and behaviourally-constrained spinner dolphin (Stenella longirostris) population, off Hawaii Island, and exposure effects on their daytime cumulative activity budget. Dolphins were exposed to human activities within 100m for 82.7% of the daytime, with a median duration of 10 min between exposure events. Individual dolphins spent on average 61.7% (SD=6.5) of their daytime resting. Of their total rest time, >90% occurred inside sheltered bays. Despite high levels of human exposure, we did not observe an effect on dolphin resting behaviour. The short intervals between exposure events likely prevent dolphins from returning to a natural resting state before the next event. Consequently, 'control' observations may represent a resting behaviour of a more vigilant nature. Chronic levels of exposure to human activities could lead to rest deprivation, displacement from preferred resting habitats and ultimately negative population level effects. These results have implications for new proposed legislation aiming to reduce dolphin exposure to human activities.
Figure 9 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 9. Fannyella abies, holotype (B970): (A) opercular scales; (B) marginal scales.
Figure 10 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 10. Fannyella abies, holotype (B970): (A) body scales; (B) coenenchymal scales.
Data from: Chronic exposure of Hawaii Island spinner dolphins (Stenella longirostris) to human activities
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Figure 3 in Designation of Thouarella abies Broch, 1965 as the type species of the subgenus Fannyella (Scyphogorgia) Cairns and Bayer, 2009, and description of a new genus for Stenella (Dasystenella) liouvillei Gravier, 1913 (Octocorallia: Primnoidae)
Figure 3. Scopaegorgia liouvillei comb. nov., holotype (MNHN Oct.0000–0233): (A, B) polyps on lateral view; (C) polyp on adaxial view.
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