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Influence of terrestrial organic matter in marine food webs of the Beaufort Sea shelf and slope

机译：陆生有机质对波弗特海陆架和斜坡海洋食物网的影响

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ABSTRACT: Forecasted increases in terrestrial organic matter (OMterr) inputs to the Arctic Beaufort Sea necessitate a better understanding of the proportional contribution of this potential food source to the trophic structure of marine communities. This study investigated the relative ecological importance of OMterr across the Beaufort Sea shelf and slope by examining differences in community trophic structure concurrent with variation in terrestrial versus marine organic matter influence. Oxygen stable isotope ratios (δ18O) of surface water confirmed the widespread influence of Canada’s Mackenzie River plume across the Beaufort Sea. Carbon stable isotope ratios (δ13C) of pelagic particulate organic matter (pPOM) and marine consumers indicated a significant decrease in OMterr presence and utilization by consumers with increasing distance from the Mackenzie River outflow. Food web length, based on the nitrogen stable isotope ratios (δ15N) of marine consumers, was greater closer to the Mackenzie River outflow both in shelf and slope locations, due to relatively higher δ15N values of pelagic and benthic primary consumers. Strong microbial processing of OMterr in the eastern regions of the Beaufort Sea is inferred based on a trophic gap between assumed end members and lower trophic consumers. A greater proportion of relative epifaunal biomass occupying higher trophic levels suggests that OMterr as a basal food source can provide substantial energetic support for higher marine trophic levels. These findings challenge the current conception of low terrestrial matter usage in the Arctic marine food web, and indicate the need for a more specific understanding of energy transfer through the OMterr-associated microbial loop.
机译：摘要：预测到北极波弗特海的陆地有机物（OM terr ）输入量的增加，需要更好地了解这种潜在食物来源对海洋群落营养结构的比例贡献。这项研究通过研究群落营养结构的差异以及陆地和海洋有机质影响的变化，研究了整个波福尔海陆架和斜坡的OM terr 的相对生态重要性。地表水的氧稳定同位素比（δ 18 O）证实了加拿大Mackenzie河羽流在博福特海的广泛影响。上层颗粒有机物（pPOM）和海洋消费者的碳稳定同位素比（δ 13 C）表明，随着距消费者距离的增加，消费者OM terr 的存在和利用显着减少。麦肯齐河流出。基于海洋消费者氮稳定同位素比率（δ 15 N），食物网的长度在架子和斜坡位置都更接近麦肯齐河流出，这是由于δ相对较高中上层和底栖主要消费者的15 N值。根据假定的最终成员与较低营养消费者之间的营养差距，推断出在波弗特海东部地区对OM terr 的强大微生物加工作用。较高营养水平的相对表层生物量占较大比例，表明OM terr 作为基础食物来源可以为较高的海洋营养水平提供实质性的能量支持。这些发现挑战了目前北极海洋食物网中低地物使用的概念，并表明需要更具体地了解通过OM terr 相关微生物环的能量转移。

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