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首页> 外文期刊>ICES Journal of Marine Science >An experimental study of the ecological impacts of hydraulic bivalve dredging on maerl
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An experimental study of the ecological impacts of hydraulic bivalve dredging on maerl

机译：水力双瓣疏dr对黄泥生态影响的实验研究

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摘要

A short-term experiment to assess the ecological impact of a hydraulic blade dredge on a maerl community was carried out during November 2001 in the Clyde Sea area on the west coast of Scotland. A fluorescent sediment tracer was used to label dead maerl, which was then spread out on the surface of sediment to act as a proxy for living maerl. The fauna collected by the dredge was dominated by the bivalves Dosinia exoleta and Tapes rhomboides, which were found to be intact. The target razor clams Ensis spp. were caught in low numbers, which reflected the low abundance of this genus within the maerl habitat. The hydraulic dredge removed, dispersed and buried the fluorescent maerl at a rate of 5.2 kg m~(-2) and suspended a large cloud of sediment into the water column, which settled out and blanketed the seabed to a distance of at least 8 m either side of the dredge track. The likely ecological consequences of hydraulic dredging on maerl grounds are discussed, and a case is made for protecting all maerl grounds from hydraulic dredging and establishing them as reservoirs to allow for the recruitment of commercial bivalve populations at adjacent fished sites.
机译：2001年11月，在苏格兰西海岸的克莱德海地区进行了一项短期试验，以评估液压叶片挖泥机对泥石流社区的生态影响。使用荧光沉积物示踪剂标记死的大麦粒，然后将其散布在沉积物表面上，充当活体大麦粒的替代物。挖泥机收集的动物区系以发现完整的双壳类Dosinia exoleta和Tapes rhomboides为主。目标剃刀c蛤sis Ensis spp。被捕获的数量很少，这反映出该物种在梅尔栖息地中的丰度很低。水力挖泥机以5.2 kg m〜（-2）的速度清除，分散和掩埋了荧光粉，并将大量的沉淀物悬浮到水柱中，沉淀下来并覆盖海床至少8 m挖泥机轨道的两侧。讨论了在黄土地上进行水力疏dr的可能的生态后果，并提出了保护所有黄土地不进行水力疏and并将其建立为水库的条件，以允许在临近的捕鱼地点招募商业双壳类种群。

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