Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic
Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic
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加拿大北极地区巴芬湾春季深海底栖大型动物对冰源有机物的依赖通过多个营养标记突出
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
P. Archambault
中科院分区：
文献类型：
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作者：
G. Yunda;T. Brown;L. Michel;B. Saint;Rémi Amiraux;C. Nozais;P. Archambault
底栖生物主要依赖于来自初级生产者的有机物的季节性脉冲。在北极，气候变暖导致的海冰减少可能会导致食物供应发生变化，对底栖营养动态的影响尚不清楚。 2016 年春季，在巴芬湾季节性冰雪覆盖区域，深度为 199 至 2,111 m 的站位对底栖消费者饮食和食物网结构进行了研究。我们使用高度支化类异戊二烯 (HBI) 脂质生物标志物和稳定同位素比（δ13C、δ15N）的新型组合来更好地了解春季海底碳源的可用性与其在底栖食物网内的同化和转移之间的关系。海冰中的有机碳（交感碳 [SC]）是底栖消费者的重要食物来源。脂质生物标志物分析显示沉积物中 SC（平均 SC% ± 标准差 [SD] = 86% ± 16.0，n = 17）和底栖消费组织（平均 SC% ± SD = 78% ± 19.7，n = 159）中的相对贡献较高。我们还检测到海冰浓度对沉积物和底栖消费者中 SC 的相对贡献的影响。聚类分析根据大型底栖动物同化SC的相对比例将研究区域分为三个不同的区域。我们观察到不同区域之间底栖食物网的变化，海冰浓度较低的区域生态位宽度增加，表明消费者吸收的碳源具有更大的多样性。在海冰浓度较高的地区，SC 的可用性较高，增强了初级消费者在推动营养物质向更高营养级更强转移方面所发挥的生态作用。根据我们的研究结果，SC是巴芬湾北极深海底栖生物的重要能源，因此春季海冰物候的变化可能会改变底栖食物网结构。
Benthic organisms depend primarily on seasonal pulses of organic matter from primary producers. In the Arctic, declines in sea ice due to warming climate could lead to changes in this food supply with as yet unknown effects on benthic trophic dynamics. Benthic consumer diets and food web structure were studied in a seasonally ice-covered region of Baffin Bay during spring 2016 at stations ranging in depth from 199 to 2,111 m. We used a novel combination of highly branched isoprenoid (HBI) lipid biomarkers and stable isotope ratios (δ13C, δ15N) to better understand the relationship between the availability of carbon sources in spring on the seafloor and their assimilation and transfer within the benthic food web. Organic carbon from sea ice (sympagic carbon [SC]) was an important food source for benthic consumers. The lipid biomarker analyses revealed a high relative contribution of SC in sediments (mean SC% ± standard deviation [SD] = 86% ± 16.0, n = 17) and in benthic consumer tissues (mean SC% ± SD = 78% ± 19.7, n = 159). We also detected an effect of sea-ice concentration on the relative contribution of SC in sediment and in benthic consumers. Cluster analysis separated the study region into three different zones according to the relative proportions of SC assimilated by benthic macrofauna. We observed variation of the benthic food web between zones, with increases in the width of the ecological niche in zones with less sea-ice concentration, indicating greater diversity of carbon sources assimilated by consumers. In zones with greater sea-ice concentration, the higher availability of SC increased the ecological role that primary consumers play in driving a stronger transfer of nutrients to higher trophic levels. Based on our results, SC is an important energy source for Arctic deep-sea benthos in Baffin Bay, such that changes in spring sea-ice phenology could alter benthic food-web structure.
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通过脂质生物标志物分析确定太平洋北极大陆架底栖大型和巨型动物群落的冰藻资源利用
DOI：
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发表时间：
2020
期刊：
Marine ecology
影响因子：
--
作者：
Wegner Koch, C.;Cooper, L. W.;Grebmeier, J. M.;Frey, K. E.;Brown, T. A.
通讯作者：
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影响因子：
3.1
作者：
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通讯作者：
Ingle, Rebecca
影响因子：
2.8
作者：
Grebmeier, Jacqueline M.;Frey, Karen E.;Kedra, Monika
通讯作者：
Kedra, Monika
影响因子：
3
作者：
Belt, Simon T.;Masse, Guillaume;LeBlanc, Bernard
通讯作者：
LeBlanc, Bernard