Evolution of pinnipeds
WebApr 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. WebJan 29, 2014 · Pinnipeds are uniquely suited to unravel the causal relationships between SSD and harem size. Although this monophyletic group comprises only 35 extant species (Berta and Churchill 2012), these vary greatly in both SSD and the degree of polygyny.Additionally, a wealth of information is available including ecological (Caro et al. …
Evolution of pinnipeds
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WebMay 3, 2024 · The life history of pinnipeds is especially multidimensional because they are amphibious marine mammals that carry out critical life functions both on land and in the water. Their evolutionary ties to their terrestrial ancestors are demonstrated by their dependence on the sea for foraging while often breeding and giving birth on land. WebMar 21, 2012 · Pinnipeds are semi-aquatic and all pinnipeds retain hind limbs. In pinnipeds, both the fore and hindlimbs are modified into flippers. Most pinnipeds retain a substantial coat of hair, although not ...
WebSep 9, 2024 · We selected three Ruminantia species, three cetacean species, three Canidae species, three pinniped species, an elephant, and a manatee. (C) … WebFeb 18, 2014 · Here, we report on evidence for the early evolution of dimorphism within a model mammal group, the pinnipeds. Pinnipeds show a range of sexual dimorphism and mating systems that span the extremes of modern mammals, from monomorphic taxa with isolated and dispersed mating to extreme size dimorphism with highly ordered …
WebThe 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 … WebFeb 20, 2014 · Darwin's Theory of Evolution. Since there is proof of evolution, there is proof of natural selection in pinnipeds because they had to adapt to an aquatic lifestyle instead of one on land. Evidence of …
WebJan 1, 2024 · Pinniped life histories have evolved under a combination of factors that are broadly based around the need for animals to balance their energy budgets. A common feature in the life history across all of the seals is the necessity for a terrestrial or pagophilic (ice-associated) phase during the reproductive cycle.
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). remove directory in linux forcefullyWebMay 7, 2013 · We showed that pinniped cranial morphology is very strongly influenced by phylogenetic history, with the three pinniped families, Phocidae (seals), Otariidae (fur … remove diffuser from led for more lightWebPuijila darwini was a semi-aquatic carnivore which represents a morphological link in early pinniped evolution. Its fossil remains demonstrate the presence of enlarged, probably webbed feet, robust forelimbs and an unspecialized tail. This suggests that Puijila swam quadrupedally using its webbed fore and hind feet for propulsion. Phylogenetic studies … remove directors on cipcWebIn the present study, a series of phylogenetic analyses of morphological, molecular, and combined morphological-molecular datasets were conducted to investigate the relationships of 23 extant and 44 fossil caniforme genera, in order to test the phylogenetic position of putative stem pinniped Puijila within a comprehensive evolutionary framework. With … remove directory in linux rmWebJun 7, 2024 · Modern pinnipeds (true and eared seals) employ two radically different swimming styles, with true seals (phocids) propelling themselves primarily with their hindlimbs, whereas eared seals (otariids) rely on their wing-like foreflippers. 1,2 Current explanations of this functional dichotomy invoke either pinniped diphyly 3-5 or … lahaina united methodist church websiteWebNov 2, 2024 · Pinnipeds -- a group including seals, sea lions and walruses -- are relatively recently derived marine mammals that evolved from terrestrial carnivorans and … remove diction from iphone keyboardWebto pinnipeds: “With Enaliarctos considered the earliest pinniped, there exists a major transformational gap between a terrestrial ancestor and the appearance of flippered pinnipeds. Indeed, most studies of pinniped relationships and evolution do not consider the critical first evolutionary stages, that ultimately gave rise to this remove dictionary