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首页> 外文期刊>Estuarine Coastal and Shelf Science >The Food Web of Potter Cove (Antarctica): complexity, structure and function
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The Food Web of Potter Cove (Antarctica): complexity, structure and function

机译：波特湾食物网（南极洲）：复杂性，结构和功能

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Knowledge of the food web structure and complexity are central to better understand ecosystem functioning. A food-web approach includes both species and energy flows among them, providing a natural framework for characterizing species' ecological roles and the mechanisms through which biodiversity influences ecosystem dynamics. Here we present for the first time a high-resolution food web for a marine ecosystem at Potter Cove (northern Antarctic Peninsula). Eleven food web properties were analyzed in order to document network complexity, structure and topology. We found a low linkage density (3.4), connectance (0.04) and omnivory percentage (45), as well as a short path length (1.8) and a low clustering coefficient (0.08). Furthermore, relating the structure of the food web to its dynamics, an exponential degree distribution (in- and out-links) was found. This suggests that the Potter Cove food web may be vulnerable if the most connected species became locally extinct. For two of the three more connected functional groups, competition overlap graphs imply high trophic interaction between demersal fish and niche specialization according to feeding strategies in amphipods. On the other hand, the prey overlap graph shows also that multiple energy pathways of carbon flux exist across benthic and pelagic habitats in the Potter Cove ecosystem. Although alternative food sources might add robustness to the web, network properties (low linkage density, connectance and omnivory) suggest fragility and potential trophic cascade effects. (C) 2017 Elsevier Ltd. All rights reserved.
机译：对食物网结构和复杂性的了解对于更好地了解生态系统功能至关重要。食物网方法同时包括物种和能量流，为描述物种的生态作用和生物多样性影响生态系统动态的机制提供了自然框架。在这里，我们首次展示了位于南极半岛北部波特湖的海洋生态系统的高分辨率食物网。分析了11个食物网的属性，以记录网络的复杂性，结构和拓扑。我们发现链接密度低（3.4），连通性（0.04）和杂食率（45），路径长度短（1.8）和聚类系数低（0.08）。此外，将食物网的结构与其动力学相关联，发现了指数级分布（内链和外链）。这表明，如果联系最紧密的物种在当地灭绝，波特湖的食物网可能会变得脆弱。对于另外三个相连的功能组中的两个，竞争重叠图表明根据两栖类动物的摄食策略，深海鱼类与生态位特化之间的高营养相互作用。另一方面，猎物重叠图还显示，在波特湾生态系统的底栖和中上生境中存在多种碳通量能量路径。尽管其他食物来源可能会增加网络的健壮性，但网络属性（低链接密度，连通性和杂食性）表明其脆弱性和潜在的营养级联效应。 （C）2017 Elsevier Ltd.保留所有权利。

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