How many cubs can a mum nurse? Maternal age and size influence litter size in polar bears.
作者： Dorinda Marie Folio , Jon Aars , Olivier Gimenez , Andrew E. Derocher , Øystein Wiig
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摘要: Life-history theory predicts that females' age and size affect the level of maternal investment in current reproduction, balanced against future reproductive effort, maintenance survival. U...
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