Evolution of pinnipeds
WebApr 13, 2024 · Killer whales' diet estimates showed that populations seem to feed on a mix of cetaceans and pinnipeds in the western NA, a mix of pinnipeds and fish in the mid-NA, and a majority of fish with some marine mammals in the eastern NA. Yet, within most locations, individual feeding preferences were also observed. WebJan 31, 2024 · Yuan et al. sequenced the genomes of 17 marine mammals, providing an excellent basis to further elucidate mammalian aquatic evolution.Surprisingly, in their examination of the previously published Antarctic fur seal (Arctocephalus gazella) genome (), Yuan et al. report the pseudogenization of uncoupling protein 1 (UCP1), the key driver …
Evolution of pinnipeds
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WebThe oldest definitive pinniped fossils date from approximately 30.6–23 million years ago (Ma) in the North Pacific. Pinniped monophyly is consistently supported; the group … WebSep 1, 1999 · The origin of the amphibious lifestyle of pinnipeds occurred at a time when coastal upwelling intensified (White et al. 1992), resulting in an abundant, diverse marine food resource for which...
WebSome taxonomists maintained that pinnipeds are a diphyletic assemblage, and that the eared seals shared a common ancestry with the bears (family Ursidae), while the true seals were most closely related to the weasel group (family Mustelidae), or more specifically the otters (subfamily Lutrinae). WebSep 1, 1999 · In pinnipeds, there is general agreement that the distribution of key resources favors the ...
http://www.nhc.ed.ac.uk/index.php?page=493.172.293 WebApr 13, 2024 · The convergent evolution of a fusiform (spindle-shaped) body shape has occurred in many aquatic vertebrates from fish to mammals, both extant and extinct …
WebApr 11, 2024 · Multimodal imitation of actions, gestures and vocal production is a hallmark of the evolution of human communication, as both, vocal learning and visual-gestural imitation, were crucial factors that facilitated the evolution of speech and singing. Comparative evidence has revealed that humans are an odd case in this respect, as the …
WebJan 1, 2024 · Pinnipeds—fur seals and sea lions, walruses, and seals—are one of three major clades of extant marine mammals, having a fossil record going back at least to the … dynamics ax er diagramWebNov 15, 2024 · Our findings provide insight into the common features of pinniped genomes, which is less clear than the convergent evolution of pinnipeds. Pinnipeds are the most amphibious mammalian species. dynamics ax nettcp uriWebOrigins and evolution. Otarids, phocids and the walrus belong to a group of mammals known as pinnipeds (meaning feather-, fin- or web-footed). Pinnipeds are recognised as aquatic relatives of terrestrial members of the Order Carnivora and are thought to have diverged from an arctoid carnivore, belonging to the dog branch of Carnivorans. dynamics ax inventory block2.2Evolutionary history 3Anatomy and physiology Toggle Anatomy and physiology subsection 3.1Locomotion 3.2Senses 3.3Diving adaptations 3.4Thermoregulation 3.5Sleep 4Distribution and habitat 5Behavior and life history Toggle Behavior and life history subsection 5.1Foraging and predation … See more Pinnipeds , commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammals. They comprise the extant families Odobenidae (whose only living member is the See more Taxonomy The German naturalist Johann Karl Wilhelm Illiger was the first to recognize the pinnipeds as a distinct taxonomic unit; in 1811 he gave the name Pinnipedia to both a family and an order. American zoologist See more Living pinnipeds mainly inhabit polar and subpolar regions, particularly the North Atlantic, the North Pacific and the Southern Ocean. They are entirely absent from Indomalayan waters. Monk seals and some otariids live in tropical and subtropical waters. … See more Cultural depictions Various human cultures have for millennia depicted pinnipeds. The anthropologist, A. Asbjørn Jøn, has analysed beliefs of the Celts of Orkney and Hebrides who believed in selkies—seals that could change into humans and walk … See more The name "pinniped" derives from the Latin words pinna "fin" and pes, pedis "foot". The common name "seal" originates from the Old English word seolh, which is in turn derived from the See more Pinnipeds have streamlined, spindle-shaped bodies with reduced or non-existent external ear flaps, rounded heads, flexible necks, limbs modified into flippers, and small tails. … See more Pinnipeds have an amphibious lifestyle; they spend most of their lives in the water, but haul out to mate, raise young, molt, rest, thermoregulate or escape from aquatic predators. Several species are known to migrate vast distances, particularly in response to … See more dynamics ax jobs foWebApr 23, 2009 · The discovery suggests that the evolution of pinnipeds included a freshwater transitional phase, and may support the hypothesis that the Arctic was an early centre of pinniped evolution. dynamics ax filtersWebNov 9, 2007 · General structure of the supertree. Our preferred hypothesis of pinniped evolution is that derived from the molecular supertree with all genes analyzed individually (Fig. 1; see Methods).It agrees broadly with other recent studies (e.g., [10–15, 23, 24, 26, 32]).In particular, the monophyly of each of Pinnipedia, Otarioidea, Phocidae, Otariidae, … crysta pennington columbus ohioWebThe oldest pinnipeds, a paraphyletic group called the “enaliarctines”, are known from Oligocene-lower Miocene rocks in the North Pacific, are relatively small and ecologically generalized species intermediate in size … crysta pennington attorney