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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Displacement of epifauna from seagrass blades by boat wake
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Displacement of epifauna from seagrass blades by boat wake

机译：船尾使海草刀片上的表生动物移位

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摘要

Due to the increasing accessibility of waterways under coastal development, recreational boating is among the growing disturbances to seagrasses at the local scale. While previous studies indicate that in decreasing and fragmenting seagrass habitat, boating can impact the diverse faunal assemblages associated with this habitat, direct impacts of boat wake on phytal invertebrates have not been assessed. By sampling seagrass blades twice before, immediately after and 1 h after exposure to recreational boat wake, this study documented the displacement of macroinvertebrates from flapping seagrass blades. At wake-exposed sites, up to five-fold decreases in the total abundances of amphipods and polychaetes and two-fold deceases in taxon richness were evident from immediately before to immediately after the disturbance of wake. By contrast, at control sites, the abundance and richness of these taxa remained fairly unchanged during the study and in some cases even increased. Although many of the displaced taxa were mobile, additional sampling indicated that they did not completely recolonize seagrass patches within 1 h of the disturbance. Thus, in places where boat traffic is relatively frequent, permanent depression of abundances of macroinvertebrates in seagrass may occur. This is of concern given that macroinvertebrates fuel fisheries productivity. Thus, in areas with frequent and or intense boating activity, nursery functions of seagrass beds may be severely compromised.
机译：由于沿海开发条件下水路的可及性日益增加，娱乐性划船已成为当地范围内对海草日益严重的干扰之一。尽管先前的研究表明，在减少和碎片化海草栖息地的过程中，划船会影响与此栖息地相关的各种动物群落，但尚未评估划船对植物无脊椎动物的直接影响。通过在接触休闲船尾之前，之后和之后的1小时内对海草叶片进行两次采样，这项研究记录了扑动的海草叶片中大型无脊椎动物的位移。在受尾流影响的位置，从尾流受到干扰之前到之后，两栖动物和多毛类动物的总丰度最多下降了五倍，而分类生物的丰富度却下降了两倍。相比之下，在对照地点，这些分类单元的丰度和丰富度在研究期间保持相当的水平，在某些情况下甚至有所增加。尽管许多流离失所的分类单元是可移动的，但进一步采样表明，它们在干扰后1小时内并未完全重新定殖海草斑块。因此，在船只交通相对频繁的地方，海草中大量无脊椎动物的数量可能会永久减少。鉴于大型无脊椎动物为渔业带来生产力，这值得关注。因此，在划船活动频繁或激烈的地区，海草床的育苗功能可能会严重受损。

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