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48 results for “Oceanic Dispersal”
Data from: Comparative population genomics reveals key barriers to dispersal in Southern Ocean penguins
The mechanisms that determine patterns of species dispersal are important factors in the production and maintenance of biodiversity. Understanding these mechanisms helps to forecast the responses of species to environmental change. Here we used a comparative framework and genome-wide data obtained through RAD-seq to compare the patterns of connectivity among breeding colonies for five penguin species with shared ancestry, overlapping distributions, and differing ecological niches, allowing an examination of the intrinsic and extrinsic barriers governing dispersal patterns. Our findings show that at-sea range and oceanography underlie patterns of dispersal in these penguins. The pelagic niche of emperor (Aptenodytes forsteri), king (A. patagonicus), Adélie (Pygoscelis adeliae) and chinstrap (P. antarctica) penguins facilitates gene flow over thousands of kilometres. In contrast, the coastal niche of gentoo penguins (P. papua) limits dispersal, resulting in population divergences. Oceanographic fronts also act as dispersal barriers to some extent. We recommend that forecasts of extinction risk incorporate dispersal and that management units are defined by at-sea range and oceanography in species lacking genetic data.
FIGURE 1 in Gone with the wind: westward dispersal across the Indian Ocean and island speciation in Hemicordulia dragonflies (Odonata: Corduliidae)
FIGURE 1. Secondary genitalia of Hemicordulia africana n. sp. in lateral view.
Figure 8. Energy Dispersive X in Morphological updates and molecular description of Heterosentis holospinus Amin, Heckmann, & Ha, 2011 (Acanthocephala, Arhythmacanthidae) in the Pacific Ocean off Vietnam
Figure 8. Energy Dispersive X-Ray spectrum of a Gallium cut hook tip of a Heterosentis holospinus specimen showing high levels of sulfur similar to those of the hook edge at mid-cut (Table 2). The X-ray data are the elemental analysis of the hook tip (see bolded figures in Table 2). Insert: SEM of a whole proboscis and cross sections near the hook tip of Gallium cut hooks showing the thick, high-sulfur hook edge.
Fig. 7 in Long distance dispersal and pseudo-cryptic species in Gastrotricha: first description of a new species (Chaetonotida, Chaetonotidae, Polymerurus) from an oceanic island with volcanic rocks
Fig. 7. Scanning electron microscopy. Polymerurus insularis sp. nov. A–B, D–E. Paratype (ZUEC GCH 59). C. Paratype (ZUEC GCH 60). A. Dorsal view of the body. B. Dorsolateral view of the head, showing the cephalion and its lateral projections. C. Lateral view of the head, highlighting the lateral pleurae. D–E. Dorsal trunk view, highlighting scale Type 1. Abbreviations: ce = cephalion; fr = furcal rami; lc = locomotory cilia; lce = lateral cephalic expansions; pl = pleurae; sc-1 = Type 1 scales. Scale bars: A = 40 µm; B–C = 5 µm; D = 20 µm; E = 10 µm.
Highly mobile seed predators contribute to interisland seed dispersal within an oceanic archipelago
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Data from: Comparative population genomics reveals key barriers to dispersal in Southern Ocean penguins
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Data from: Natatanuran frogs used the Indian Plate to step-stone disperse and radiate across the Indian Ocean
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Data from: Natatanuran frogs used the Indian Plate to step-stone disperse and radiate across the Indian Ocean
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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