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首页> 外文期刊>Marine ecology progress series >Variation in the diet of beluga whales in response to changes in prey availability: insights on changes in the Beaufort Sea ecosystem
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Variation in the diet of beluga whales in response to changes in prey availability: insights on changes in the Beaufort Sea ecosystem

机译：白鲸饮食的变异，以响应猎物可用性的变化：博览会发生洞察的洞察

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The eastern Beaufort Sea (EBS) beluga whale Delphinapterus leucas population has experienced a 20 yr decline in inferred growth rates of individuals, which is hypothesized to have resulted from changes in prey availability. We used fatty acid signatures and stable isotope ratios to reconstruct the proportional contributions of 14 prey species to the diets of 178 beluga whales from 2011 to 2014. Prey estimates using quantitative fatty acid signature analysis suggest that EBS beluga whales primarily consume Arctic cod Boreogadus saida, a species highly sensitive to climate change. Prey estimates varied with year and sex and size class of the whales, with large males consuming the highest proportions of Arctic cod, and females consuming the highest proportions of capelin Mallotus villosus. Estimated proportional contributions of Arctic cod to beluga diet decreased from 2011 to 2014, coinciding with an increase in capelin. Belugas consumed the highest proportions of capelin and the lowest proportions of cod in 2014, the same year in which body condition indices were lowest in the whales. We hypothesize that changing conditions in the Beaufort Sea ecosystem may result in a decreased consumption of Arctic cod by belugas and increased consumption of capelin, which may result in a decline in condition. This may predominately affect females and juveniles since they consume the highest proportions of capelin; however, long-term monitoring is needed for confirmation. Understanding inter-annual variation in prey, and the longer-term nutritional implications of shifting from an Arctic cod- to a capelindominated diet should be a priority for monitoring EBS predators.
机译：Eastern Beaufort Sea（EBS）Beluga Whale Delphinapterus Leucas人口在推断的个人推测增长率下降了20岁，这是假设的，这是由于猎物可用性的变化导致。我们使用脂肪酸签名和稳定的同位素比重建了2011至2014年的178名Beluga Whales饮食的比例贡献。使用定量脂肪酸签名分析的猎物估计表明EBS Beluga Whales主要消耗北极鳕鱼博罗阿·博罗加达群岛，一种对气候变化高度敏感的物种。猎物估计随着鲸鱼的年度和性别和大小阶级而变化，具有大的雄性，消耗最高比例的北极鳕鱼，以及消耗最高比例的羊毛林马洛洛斯·米洛斯的女性。从2011年到2014年估计北极鳕鱼到白氏饮食的比例贡献从2011年到2014年下降，同时随着Capelin的增加。白肉鲸消耗了最高比例的卡塞林和2014年的鳕鱼的最低比例，同年鲸鱼身体状况指数最低的同一年。我们假设Beaufort海洋生态系统中的变化条件可能导致Belugas的北极鳕鱼消耗降低，增加了Capelin的消耗，这可能导致条件下降。这可能主要影响女性和青少年，因为它们消耗了最高比例的卡塞林;但是，确认需要长期监测。了解猎物年间变异，以及从北极鳕鱼转移到五角素饮食的长期营养影响应该是监测EBS捕食者的优先事项。

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