White-beaked dolphins trapped in the ice and eaten by polar bears

Polar research

Agnès Brenière¹  Samuel Blanc¹  Magnus Andersen²  Jon Aars³ 

[1] 49 chemin des Combes, FR-38760 Saint Paul de Varces, France;Norwegian Polar InstituteFram Centre, P.O. Box 6606 Langnes, NO-9296 Tromsø, Norway;Norwegian Polar InstituteFram Centre, P.O. Box 6606 Langnes, NO-9296 Tromsø, NorwayCorrespondence

关键词: White-beaked dolphin;    polar bear;    caching;    Arctic;    Svalbard;   

DOI  :  10.3402/polar.v34.26612

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Polar bears (Ursus maritimus) depend on sea ice, where they hunt ice-associated seals. However, they are opportunistic predators and scavengers with a long list of known prey species. Here we report from a small fjord in Svalbard, Norwegian High Arctic, a sighting of an adult male polar bear preying on two white-beaked dolphins (Lagenorhynchus albirostris) on 23 April 2014. This is the first record of this species as polar bear prey. White-beaked dolphins are frequent visitors to Svalbard waters in summer, but have not previously been reported this far north in early spring. We suggest they were trapped in the ice after strong northerly winds the days before, and possibly killed when forced to surface for air at a small opening in the ice. The bear had consumed most parts of one dolphin. When observed he was in the process of covering the mostly intact second dolphin with snow. Such caching behaviour is generally considered untypical of polar bears. During the following ice-free summer and autumn, at leas...

【 授权许可】

CC BY-NC