Polar bears ( Ursus maritimus ) mating during late June on the pack ice of northern Svalbard, Norway
作者： Thomas G. Smith , Jon Aars
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摘要: Polar bears are seasonal breeders and typically mate from late March to early May. Implantation is, however, delayed until autumn, which can allow plasticity in the date of mating. As for other breeders, a rapid return estrus after loss dependent offspring be expected, even into summer. A few earlier observations dissections dead animals suggest that polar able We report on mating incident 29 June 2014, first documented this season among wild bears. The female had lost her cub during period prior event. speculate she season, entered successfully mated June. Keywords: bear; season; behaviour; Svalbard; Arctic. (Published: 2 2015) Citation: Research 2015, 34 , 25786, http://dx.doi.org/10.3402/polar.v34.25786
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