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首页> 外文期刊>Estuarine Coastal and Shelf Science >Effects of beach replenishment on intertidal invertebrates: A 15-month, eight beach study
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Effects of beach replenishment on intertidal invertebrates: A 15-month, eight beach study

机译：海滩补给对潮间带无脊椎动物的影响：一项为期15个月，八个海滩的研究

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摘要

Beach replenishment is an increasingly popular means to remediate coastal erosion, but no consensus exists regarding how long replenishment affects sandy beach intertidal invertebrates, key components of beach ecosystems. We monitored the intertidal invertebrate community for fifteen months following a replenishment project at eight beaches, each with replenished and control sections, across San Diego County. Nearly all taxa showed major declines in abundance immediately following replenishment. Populations of talitrid amphipods and the bean clam Donax gouldii recovered within one year, sooner than in previous studies. On some beaches, populations of the mole crab Emerita analoga bloomed four months after replenishment and were more numerous on replenished portions of beaches at that time. Mole crab populations subsequently declined and no longer differed by treatment. The polychaete community, composed of Scolelepis sp. and several other numerically important taxa, showed a strong replenishment-induced reduction in abundance that persisted through the end of the study. The large negative effect of replenishment on polychaetes, coupled with their overall importance to the invertebrate community, resulted in a more than twofold reduction in overall invertebrate abundance on replenished beaches at 15 months. Such reductions may have far reaching consequences for sandy beach ecosystems, as community declines can reduce prey availability for shorebirds and fish. As this and other recent studies have revealed longer times for the recovery of intertidal invertebrates than previously observed, longer study periods and more cautious estimates regarding the magnitude, variability, and duration of impacts of beach replenishment for management decision-making are warranted. (C) 2016 Elsevier Ltd. All rights reserved.
机译：海滩补给是补救海岸侵蚀的一种越来越流行的手段，但是关于补给多长时间影响沙滩潮间带无脊椎动物（海滩生态系统的关键组成部分）尚无共识。在圣地亚哥县的八个海滩进行了补给工程之后，我们对潮间带无脊椎动物社区进行了十五个月的监测。补充后，几乎所有的分类单元都显示出大量的大量下降。 talitarid amphipods和豆蛤Donax gouldii的种群在一年内恢复，比以前的研究要早。在一些海滩上，补充营养后四个月，the蟹Emerita Analoga的种群开始开花，而在当时的海滩补充区，种群数量更多。鼠的数量随后下降并且不再因治疗而异。多cha群落，由Scolelepis sp。组成。和其他几个在数字上很重要的分类单元，显示出强烈的补给引起的丰度降低，并一直持续到研究结束。补给对多毛cha的巨大负面影响，以及它们对无脊椎动物群落的总体重要性，导致在15个月补给的海滩上无脊椎动物的总体丰度降低了两倍以上。这种减少可能对沙滩生态系统产生深远的影响，因为社区的减少会减少水鸟和鱼类的猎物供应。由于这项研究和其他最近的研究表明，潮间带无脊椎动物的恢复时间比以前观察到的时间更长，因此有必要延长研究时间，并对海滩补给对管理决策的影响的大小，可变性和持续时间做出更加谨慎的估计。 （C）2016 Elsevier Ltd.保留所有权利。

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