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Anthropogenic transport of macrofauna through a sand transfer plant

机译：大型动物的人为运输通过输沙厂

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The South Lake Worth Inlet Sand Transfer Plant in Palm Beach County, Florida pumps subtidal sediment from the upcurrent to the downcurrent side of the jetty to correct jetty-induced sediment transport disruption. This pumping accounts for 35% of the overall net longshore transport. We investigated if living macrofauna could survive the sediment pumping process. We also examined the effects this activity had on the subtidal macro faunal invertebrate communities. Subtidal sediment cores were taken near the intake pipe, at the outflow pipe, and just outside the direct effects of the sand transfer plant. Benthic macrofauna and sand grain size were examined and compared. Macrofauna, live and preserved, were confirmed exiting the outflow pipe. Low diversity, low abundance macrofaunal communities were found at all sample sites. Macrofaunal abundance was primarily isopods (79%) and polychaetes (14%). Three isopod and one polychaete species constituted 89% of the community diversity. Both inflow borrow pit and outflow deposition sampling sites exhibited different community structure compared to adjacent control sites. The inflow borrow pit presented a high population of the isopod Eurydice personata. The outflow deposition site had the highest species diversity. The outflow deposition site also showed much coarser mean sediment grain size compared to other sites. The differences found at the sites direct associated with the sand transfer plant demonstrated localized disturbance. We concluded that although the plant disturbs the adjacent community it also helps maintain the macrofaunal community structure and sand grain size on the downdrift side of the South Lake Worth Inlet. Further studies integrating abiotic and biotic components will assist in management practices and our understanding of nearshore systems.
机译：佛罗里达州棕榈滩县的南湖沃思湾进沙输沙厂将潮间带沉积物从码头的上游流向下游流向，以纠正码头引起的沉积物运输中断。抽水量占总净长岸运输量的35％。我们调查了活的大型动物是否可以在泥沙泵送过程中幸存下来。我们还检查了该活动对潮下大型动物无脊椎动物群落的影响。潮下带沉积物岩心取自进水管附近，流出管处，并且正好在输沙厂直接作用的外部。检查并比较了底栖大型动物和沙粒大小。活体和保存完好的大型动物被确认从流出管中流出。在所有采样点都发现了低多样性，低丰度的大型动物群落。大型动物的丰度主要是等足动物（79％）和多足动物（14％）。 3个等足类和1个多毛类物种构成了社区多样性的89％。与相邻的控制站点相比，流入借矿坑和流出沉积采样站点都表现出不同的群落结构。流入的取土场呈现出大量的等足类Eurydice体。流出沉积点的物种多样性最高。与其他位置相比，流出沉积位置的平均沉积物粒度也大得多。在直接与输沙厂相关的地点发现的差异表明存在局部干扰。我们得出的结论是，尽管该植物扰乱了邻近的社区，但它也有助于维持南湖沃思湾入口下游侧的大型动物群落结构和沙粒大小。将非生物和生物成分整合在一起的进一步研究将有助于管理实践和我们对近岸系统的理解。

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