Data from: How many cubs can a mum nurse? Maternal age and size influence litter size in polar bears

Dorinda Marie Folio, Jon Aars, Olivier Gimenez, Andrew E. Derocher, Oystein Wiig & Sarah Cubaynes
Life history theory predicts that females' age and size affect the level of maternal investment in current reproduction, balanced against future reproductive effort, maintenance and survival. Using long-term (30 years) individual data on 193 female polar bears (Ursus maritimus), we assessed age- and size-specific variation on litter size. Litter size varied with maternal age, younger females had higher chances of losing a cub during their first months of life. Results suggest an improvement of reproductive...
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