Abstract Long-term effects of bottom trawling on large sponges in the Gulf of Alaska
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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Long-term effects of bottom trawling on large sponges in the Gulf of Alaska
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Long-term effects of bottom trawling on large sponges in the Gulf of Alaska

机译：阿拉斯加海湾大海绵底部拖网的长期影响

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AbstractManipulative studies that characterize short-term effects of bottom trawls on seafloor habitats are numerous, but studies that examine long-term effects are rare. The long-term (13 years) effects of a single bottom trawl on large (>20cm) erect sponges were investigated by revisiting the site of prior experimental trawling studies. In prior studies, large sponges were assessed immediately after trawling and 1yr post-trawling. Thirteen years post-trawling, the average density of large sponges was 31.7% lower (range 1.5–53.0%) and the incidence of sponge damage (torn, necrotic, missing tissue, prone) was 58.8% higher within strip transects in trawled versus untrawled reference areas. For all sponge species combined, the mean density of large sponges was 3.19 individuals 100m?2in trawled areas and 4.67 individuals 100m?2in reference areas. The most abundant sponge species in both trawled and reference areas wasRhabdocalyptus dawsoni. Mean density of this species differed greatly between trawled (1.57 individuals 100m?2) and reference areas (2.91 individuals 100m?2). Thirteen years after trawling, the mean percentage of damaged sponges on strip transects was 15.3% in trawled areas and 6.3% in reference areas. The rate of damage in trawled areas was less than that observed both immediately after trawling and 1 year later. The persistence of damage (lower sponge densities and higher rates of injury in trawled areas) and the potential resultant changes to benthic communities where deepwater habitat-forming biota, such as large erect sponges, are present
机译：<！[cdata [ 抽象 操纵研究，表征海底栖息地底拖网的短期效果很多，但研究长期效果的研究是罕见的。通过重新探测现有的实验牵引研究的部位来研究长期（13岁）对大（> 20cm）直立海绵的单个底部拖网的影响。在现有研究中，在拖网后立即进行大型海绵，并在拖网后1 ry。拖网后十三年，大海绵的平均密度降低了31.7％（1.5-53.0％）和海绵损伤的发生率（撕裂，坏死，缺失的组织，易于缺失）在拉伸与未经控制的与拉伸与横切之间的58.8％。参考领域。对于所有海绵物种组合，大海绵的平均密度为3.19个体100米？2 在拖拉区域和4.67个体100米？2 在参考区域。拖网和参考领域的最丰富的海绵物种是 rhabdocalyptus dawsoni 。在拖延之间的平均密度大大差异（1.57个体100m ？2 ）和参考区域（2.91个体100m 2 ）。拖网后十三年，条带越野的损坏海绵的平均百分比为15.3％，在拖拉地区为15.3％，参考区域为6.3％。拖延地区的损坏率小于拖网和1年后立即观察到的速度。存在损害的持续性（较低的海绵密度和拖延地区的伤害率较高）以及对Benthic Compyities的潜在所得改变，其中深水栖息地形成生物群（如大型直立海绵）存在

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