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Spatial and temporal variability in ringed seal (Pusa hispida) stable isotopes in the Beaufort Sea

机译：波弗特海环斑海豹（Pusa hispida）稳定同位素的时空变化

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Arctic ecosystem dynamics are shifting in response to warming temperatures and sea ice loss. Such ecosystems may be monitored by examining the diet of upper trophic level species, which varies with prey availability. To assess interannual variation in the Beaufort Sea ecosystem, we examined spatial and temporal trends in ringed seal ( ) δ C and δ N in claw growth layers grown from 1964 to 2011. Stable isotopes were correlated with climate indices, environmental conditions, seal population productivity, and geographic location. Sex and age did not influence stable isotopes. Enriched C was linked to cyclonic circulation regimes, seal productivity, and westward sampling locations. Higher δ N was linked to lower sea surface temperatures, a higher percentage of pups in the subsistence harvest, and sample locations that were eastward and further from shore. From the 1960s to 2000s, ringed seal niche width expanded, suggesting a diversification of diet due to expansion of prey and/or seal space use. Overall, trends in ringed seal stable isotopes indicate changes within the Beaufort Sea ecosystem affected by water temperatures and circulation regimes. We suggest that continued monitoring of upper trophic level species will yield insights into changing ecosystem structure with climate change.
机译：北极生态系统的动态响应温度升高和海冰流失而发生变化。可以通过检查高营养级别物种的饮食来监测此类生态系统，这些物种随猎物的可用性而变化。为了评估波弗特海生态系统的年际变化，我们研究了从1964年到2011年生长的爪状生长层中环形海豹（）δC和δN的时空趋势。稳定的同位素与气候指数，环境条件，海豹种群生产力相关以及地理位置。性别和年龄均未影响稳定同位素。富集的碳与旋风的循环方式，海豹的生产力和向西采样的位置有关。较高的δN与较低的海面温度，较低的自给性收获中的幼仔比例以及向东且离海岸较远的采样位置有关。从1960年代到2000年代，环状海豹的生态位宽度不断扩大，这表明由于猎物和/或海豹的使用空间扩大，饮食结构变得多样化。总体而言，环形海豹稳定同位素的趋势表明，波弗特海生态系统内的变化受到水温和循环制度的影响。我们建议继续监测营养级别较高的物种将有助于洞察随着气候变化而变化的生态系统结构。

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