Genetic Analysis of Twinning in Antarctic Fur Seals (Arctocephalus gazella)
نویسندگان
چکیده
منابع مشابه
Ecological implications of body composition and thermal capabilities in young antarctic fur seals (Arctocephalus gazella).
In comparison with other homeotherms, young recently weaned marine mammals in high latitudes face exceptional energetic demands when foraging and thermoregulating. Lipids are an important source of energy and a major component of insulation that allows them to meet these demands. To examine the role of lipid stores in a high-latitude pinniped, we measured the body composition and thermoregulato...
متن کاملNo relationship between microsatellite variation and neonatal fitness in Antarctic fur seals, Arctocephalus gazella.
Published studies of wild vertebrate populations have almost universally reported positive associations between genetic variation measured at microsatellite loci and fitness, creating the impression of ubiquity both in terms of the species and the traits involved. However, there is concern that this picture may be misleading because negative results frequently go unpublished. Here, we analyse t...
متن کاملTop-down and bottom-up influences on demographic rates of Antarctic fur seals Arctocephalus gazella.
Two major drivers in population dynamics are bottom-up processes, such as environmental factors that affect foraging success, and the top-down impacts of predation. Many populations of marine mammal and seabird species appear to be declining in response to reductions in prey associated with the bottom-up effects of climate change. However, predation, which usually occurs at sea and is difficult...
متن کاملGetting long in the tooth: a strong positive correlation between canine size and heterozygosity in Antarctic fur seals Arctocephalus gazella.
Most studies of heterozygosity-fitness correlations (HFCs) in natural populations relate to fitness traits expressed early in life, whereas traits that are often more difficult to measure such as longevity and adult body size remain elusive. Teeth provide a window on an individual's life history, allowing the reliable estimation of both age and body size. Consequently, we collected paired upper...
متن کاملThe metabolic characteristics of the locomotory muscles of grey seals (Halichoerus grypus), harbour seals (Phoca vitulina) and Antarctic fur seals (Arctocephalus gazella).
It is not known precisely how marine mammals are able to maintain muscle function during active swimming in breath-hold dives, when ventilation stops and heart rate falls. Examination of muscle biochemistry and histochemistry can provide information on the relative importance of different metabolic pathways, the contractile potential of the muscle fibres, the oxygen storage capacity of the musc...
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ژورنال
عنوان ژورنال: Journal of Mammalogy
سال: 2009
ISSN: 0022-2372,1545-1542
DOI: 10.1644/08-mamm-a-264r1.1