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6 results for “Mirounga angustirostris”
Sexual dimorphism of head, teeth, flipper, and body size in northern elephant seals (<em>Mirounga angustirostris</em>) throughout ontogeny
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Data from: Molecular population genetics of the northern elephant seal Mirounga angustirostris
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Data from: Climate change and the northern elephant seal (Mirounga angustirostris) population in Baja California, Mexico
The Earth′s climate is warming, especially in the mid- and high latitudes of the Northern Hemisphere. The northern elephant seal (Mirounga angustirostris) breeds and haul-outs on islands and the mainland of Baja California, Mexico, and California, U.S.A. At the beginning of the 21st century, numbers of elephant seals in California are increasing, but the status of Baja California populations is unknown, and some data suggest they may be decreasing. We hypothesize that the elephant seal population of Baja California is experiencing a decline because the animals are not migrating as far south due to warming sea and air temperatures. Here we assessed population trends of the Baja California population, and climate change in the region. The numbers of northern elephant seals in Baja California colonies have been decreasing since the 1990s, and both the surface waters off Baja California and the local air temperatures have warmed during the last three decades. We propose that declining population sizes may be attributable to decreased migration towards the southern portions of the range in response to the observed temperature increases. Further research is needed to confirm our hypothesis; however, if true, it would imply that elephant seal colonies of Baja California and California are not demographically isolated which would pose challenges to environmental and management policies between Mexico and the United States.
On following pages: 3. Northern Elephant Seal (Mirounga angustirostris); 4. Southern Elephant Seal (Mirounga leonina). in Phocidae
On following pages: 3. Northern Elephant Seal (Mirounga angustirostris); 4. Southern Elephant Seal (Mirounga leonina).
Data from: Climate change and the northern elephant seal (Mirounga angustirostris) population in Baja California, Mexico
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Data from: Density-dependent effects on reproductive output in a capital breeding carnivore, the northern elephant seal (Mirounga angustirostris)
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