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Mercury and stable isotope (δ13C and δ15N) trends in decapods of the Beaufort Sea
Polar Biology ( IF 1.5 ) Pub Date : 2020-03-21 , DOI: 10.1007/s00300-020-02646-x
A. Loria , P. Archambault , A. Burt , A. Ehrman , C. Grant , M. Power , G. A. Stern

To date, limited data are available on mercury (Hg) concentrations in Arctic benthos. It is important that we establish baseline Hg concentrations in benthic communities to improve our understanding of Hg within the Arctic marine ecosystem because they are food sources of key species, such as beluga whales, which are consumed by Inuit as a part of their traditional diet. In this study, we present Hg concentrations (total and monomethyl—THg and MMHg) in three shrimp species in the Canadian Beaufort Sea region: Eualus gaimardii, Sclerocrangon boreas and Sclerocrangon ferox. We compared the variability between the three species and investigated whether it could be accounted for by regional (depth, latitude, longitude) or biological indices (stable isotope, SI, ratios of nitrogen and carbon). E. gaimardii exhibited the lowest mean δ15N and δ13C values and mean THg and MMHg concentrations, whereas S. boreas had the highest mean δ15N value and S. ferox had the highest mean δ13C value and mean THg and MMHg concentrations. Differences in SI and Hg data among the three species were attributed to their different trophic functional groups, regional features and relative incidences of species collected at our sampling sites. The determination of baseline THg and MMHg concentrations and insight on how concentrations vary with geographical correlates reported here among three common Arctic decapod species will contribute to closing the Hg-benthos knowledge gaps within the Arctic food web.

中文翻译:

波弗特海十足目动物的汞和稳定同位素(δ13C 和 δ15N)趋势

迄今为止,关于北极底栖生物中汞 (Hg) 浓度的可用数据有限。我们必须在底栖群落中建立基线汞浓度,以提高我们对北极海洋生态系统中汞的了解,因为它们是关键物种的食物来源,例如白鲸,因纽特人将其作为传统饮食的一部分食用。在这项研究中,我们展示了加拿大波弗特海地区三种虾类的汞浓度(总和单甲基-THg 和 MMHg):Eualus gaimardii、Sclerocrangon borea 和 Slerocrangon ferox。我们比较了三个物种之间的变异性,并研究了它是否可以通过区域(深度、纬度、经度)或生物指数(稳定同位素、SI、氮和碳的比率)来解释。E. gaimardii 表现出最低的平均 δ15N 和 δ13C 值以及平均 THg 和 MMHg 浓度,而 S. borea 的平均 δ15N 值最高,而 S. ferox 的平均 δ13C 值和平均 THg 和 MMHg 浓度最高。这三个物种之间 SI 和 Hg 数据的差异归因于它们不同的营养功能组、区域特征和我们采样地点收集的物种的相对发生率。确定基线 THg 和 MMHg 浓度以及了解浓度如何随这里报告的三种常见北极十足动物物种的地理相关性而变化,将有助于缩小北极食物网中的汞-底栖动物知识差距。ferox 具有最高的平均 δ13C 值和平均 THg 和 MMHg 浓度。这三个物种之间 SI 和 Hg 数据的差异归因于它们不同的营养功能组、区域特征和我们采样地点收集的物种的相对发生率。确定基线 THg 和 MMHg 浓度以及了解浓度如何随这里报告的三种常见北极十足动物物种的地理相关性而变化,将有助于缩小北极食物网中的汞-底栖动物知识差距。ferox 具有最高的平均 δ13C 值和平均 THg 和 MMHg 浓度。这三个物种之间 SI 和 Hg 数据的差异归因于它们不同的营养功能组、区域特征和我们采样地点收集的物种的相对发生率。确定基线 THg 和 MMHg 浓度以及了解浓度如何随这里报告的三种常见北极十足动物物种的地理相关性而变化,将有助于缩小北极食物网中的汞-底栖动物知识差距。
更新日期:2020-03-21
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