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首页> 外文期刊>Estuarine Coastal and Shelf Science >Resource utilization and trophic niche width in sandy beach macrobenthos from an oligotrophic coast
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Resource utilization and trophic niche width in sandy beach macrobenthos from an oligotrophic coast

机译：贫营养化海岸沙滩大型底栖动物的资源利用和营养位宽度

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One of the paradigms underlying sandy beach ecology is the overriding control by physical processes; thus, biological interactions (i.e. food availability, competition and predation) are believed to play a role structuring macrofaunal communities only in benign habitats such as dissipative beaches. Moreover, sandy beaches are characterized by low in-situ productivity, so their food webs rely heavily on marine inputs. Studies have shown that estuarine organic matter plays a key role in influencing the dynamics of marine ecosystems. However, very few studies have tested the role of estuarine input on sandy beaches. Here, we aim to determine the impact of estuarine input on the food web of a sandy beach macrobenthic community. To this end, particulate organic matter (POM) samples from the marine environment and the estuary, as well as macrobenthic samples from the beach, were analysed for their stable isotope (SI) signature. Our results indicated that the POM SI signatures were not different along the beach, but differences were recorded between marine and estuarine sources. Bayesian mixing models indicated that the organisms did not make use of the estuarine POM at the beginning of the wet season, but relied more heavily on this resource towards the end of the wet season. This leads to the conclusion that changes in estuarine flow throughout the wet season can impact the trophic structure of macrobenthos communities, confirming a link between lotic and marine communities. Moreover, SI signatures suggest that the species collected here exhibit overlapping trophic niches, indicating high level of inter-specific competition. This highlights that species in low-productivity areas, such as the one studied here, can experience high levels of competition even in physically controlled environments such as sandy beaches. (C) 2016 Elsevier Ltd. All rights reserved.
机译：沙滩生态学的基本范式之一是通过物理过程进行的控制。因此，人们认为生物相互作用（即食物的可获得性，竞争性和掠食性）仅在良性生境（例如耗散的海滩）中构成了大型动物群落的构建者。此外，沙滩的原位生产力低，因此其食物网严重依赖海洋投入。研究表明，河口有机质在影响海洋生态系统动力学方面起着关键作用。但是，很少有研究测试河口输入在沙滩上的作用。在这里，我们旨在确定河口输入对沙滩大型底栖动物群落食物网的影响。为此，分析了来自海洋环境和河口的颗粒状有机物（POM）样品以及来自海滩的大型底栖动物样品的稳定同位素（SI）特征。我们的结果表明，沿海滩的POM SI签名没有差异，但是在海洋和河口源之间记录了差异。贝叶斯混合模型表明，生物体在雨季开始时并未利用河口的POM，但在雨季结束时更加依赖这种资源。由此得出结论，整个湿季的河口流量变化会影响大型底栖动物群落的营养结构，从而证实了水生生物群落与海洋生物群落之间的联系。此外，SI的特征表明这里收集的物种表现出重叠的营养生态位，表明种间竞争的水平很高。这突出表明，低生产力地区的物种（例如此处研究的物种）即使在人为控制的环境（例如沙滩）中，也可能经历高水平的竞争。 （C）2016 Elsevier Ltd.保留所有权利。

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