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Integrating Ecosystem Engineering and Food Web Ecology: Testing the Effect of Biogenic Reefs on the Food Web of a Soft-Bottom Intertidal Area

机译：整合生态系统工程和食物网生态学：测试生物礁对潮间带底部食物网的影响

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The potential of ecosystem engineers to modify the structure and dynamics of food webs has recently been hypothesised from a conceptual point of view. Empirical data on the integration of ecosystem engineers and food webs is however largely lacking. This paper investigates the hypothesised link based on a field sampling approach of intertidal biogenic aggregations created by the ecosystem engineer Lanice conchilega (Polychaeta, Terebellidae). The aggregations are known to have a considerable impact on the physical and biogeochemical characteristics of their environment and subsequently on the abundance and biomass of primary food sources and the macrofaunal (i.e. the macro-, hyper- and epibenthos) community. Therefore, we hypothesise that L. conchilega aggregations affect the structure, stability and isotopic niche of the consumer assemblage of a soft-bottom intertidal food web. Primary food sources and the bentho-pelagic consumer assemblage of a L. conchilega aggregation and a control area were sampled on two soft-bottom intertidal areas along the French coast and analysed for their stable isotopes. Despite the structural impacts of the ecosystem engineer on the associated macrofaunal community, the presence of L. conchilega aggregations only has a minor effect on the food web structure of soft-bottom intertidal areas. The isotopic niche width of the consumer communities of the L. conchilega aggregations and control areas are highly similar, implying that consumer taxa do not shift their diet when feeding in a L. conchilega aggregation. Besides, species packing and hence trophic redundancy were not affected, pointing to an unaltered stability of the food web in the presence of L. conchilega.
机译：从概念的观点来看，最近假设了生态系统工程师修改食物网的结构和动力学的潜力。但是，很大程度上缺乏有关生态系统工程师和食物网整合的经验数据。本文基于生态系统工程师Lanice conchilega（Polychaeta，Terebellidae）创建的潮间带生物聚集的现场采样方法，研究了假想的联系。已知这些聚集体对其周围环境的物理和生物地球化学特征以及随后对主要食物来源和大型动物（即大型，超大型和上底栖动物）群落的丰度和生物量具有相当大的影响。因此，我们假设L. conhilega聚集体影响软底潮间带食品网的消费者组合的结构，稳定性和同位素位。在法国沿海的两个软底潮间带区域取样了乳白乳杆菌聚集体和控制区域的主要食物来源和底栖上层消费者组合，并分析了它们的稳定同位素。尽管生态系统工程师对相关的大型动物群落产生了结构性影响，但乳头球菌的聚集对软底潮间带食物网结构的影响很小。乳杆菌聚集体和控制区的消费者群落的同位素生态位宽度非常相似，这意味着食用豆荚聚集体时，消费者分类群不会改变其饮食。此外，物种的包装和营养上的冗余都没有受到影响，这表明在乳杆菌的存在下食物网的稳定性没有改变。

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