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首页> 外文OA文献 >Impacts of a novel shellfishing gear on macrobenthos in a marine protected area: pump-scoop dredging in Poole Harbour, UK
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Impacts of a novel shellfishing gear on macrobenthos in a marine protected area: pump-scoop dredging in Poole Harbour, UK

机译：新型贝类渔具对海洋保护区大型底栖动物的影响：英国普尔港的泵挖式挖泥

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摘要

Understanding the impact of bottom-fishing gears at various scales and intensities on habitats and species is necessary to inform management. In Poole Harbour, UK, a multiple use marine protected area, fishermen utilise a unique “pump-scoop” dredge to harvest the introduced Manila clam Ruditapes philippinarum. Managers need to balance the socio-economic benefits of the fishery with ecological concerns across the region, which has required a revision of by-laws that include both spatial and temporal measures. Within an operational fishery, we used a Before-After-Control-Impact sampling design to assess the impacts of pump-scoop dredging on benthic physical characteristics and community structure in an area where there was no dredging, an area newly opened to dredging and an area subject to high levels of historic dredging. A sampling grid was used in each area to best capture any fishing effort in the newly opened area. Core samples were taken to a depth of 30 cm within intertidal mudflats. A significant loss of fine sediments was observed in the site subject to high intensity dredging and a significant change in community structure also occurred in both dredged sites throughout the study period. In the newly opened site this was characterised by a relative increase in species richness, including increased abundance of annelid worms, notably Hediste diversicolor and Aphelochaeta marioni and a decline in the abundance of the bivalve mollusc Abra tenuis. These changes, albeit relatively small, are attributed to physical disturbance as a direct result of pump-scoop dredging, although no difference in the classification of the biotope of the site was observed. This is of particular interest to managers monitoring site condition within areas under the new bylaws as the Manila clam is spreading to other protected estuaries in the region.
机译：必须了解各种规模和强度的海底渔具对生境和物种的影响，才能为管理工作提供信息。在英国多用途海洋保护区普尔港，渔民利用独特的“水瓢”挖泥机来收获引进的马尼拉蛤仔菲律宾蛤仔（Ruditapes philippinarum）。管理人员需要在整个地区的渔业社会经济利益与生态问题之间取得平衡，这要求修订包括时空措施在内的法规。在一个可操作的渔业中，我们使用了“控制前-影响后”抽样设计，以评估无挖泥区，新近开放挖泥区和底栖区的底栖疏on对底栖物理特征和群落结构的影响。该地区需进行高水平的历史性疏ed。每个区域都使用了一个采样网格，以最好地捕获新开放区域中的任何捕鱼活动。取岩心样品至潮间带泥滩内30厘米的深度。在整个研究期间，在经过高强度疏ging的地点，观察到细颗粒沉积物的大量流失，而且两个疏both点的群落结构也发生了重大变化。在新开放的地点，其特点是物种丰富度相对增加，其中包括网纹蠕虫的丰富度增加，特别是杂色花丝绒线虫和麻疯树（Aphelochaeta marioni）的丰富度，双壳软体动物Abra tenuis的丰度下降。这些变化尽管相对较小，却是由于泵挖挖疏direct的直接结果而造成的物理干扰，尽管未观察到该地点生物群落分类的差异。随着马尼拉蛤lam正在向该地区的其他受保护河口扩散，管理人员特别关注根据新规章监控区域内的现场状况。

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