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首页> 外文期刊>ICES Journal of Marine Science >First indications for reduced mortality of non-target invertebrate benthic megafauna after pulse beam trawling
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First indications for reduced mortality of non-target invertebrate benthic megafauna after pulse beam trawling

机译：降低非目标无脊椎动物底栖大型动物死亡率的第一个迹象

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Two alternative stimulation techniques to reduce mortality in benthic megafauna were tested relative to standard tickler chain beam trawling: longitudinal electrodes (pulse trawl) and longitudinal chains. Longitudinal chains caused higher mortality than pulse trawling in 3 species. Standard trawling gave higher mortality in Echinocardium cordatum than pulse trawling. Between longitudinal chain and standard trawling were no significant differences. This trend in decreasing mortality from longitudinal, to standard and then pulse trawling was confirmed by a similar decline in: i) numbers of significant species mortalities per trawl type, ii) average mortalities, i.e. longitudinal chain caused 41% more mortality than standard trawling and pulse trawling 43% less, iii) pre- and post-trawling community dissimilarities. A significant majority of species showed higher mortalities after longitudinal than after standard trawling and, conversely, lower mortalities after pulse trawling. Trawls with longitudinal chains instead of cross tickler chains increase megafaunal impact. On the contrary, pulse trawling can reduce the impact, although average mortality remains substantial (25%) even in impoverished benthic test assemblages in the southern North Sea. Power, generally was low and reference areas, free of (pulse) trawling, and inhabited by more vulnerable taxa will facilitate higher powered studies on the impact of standard and alternative trawling techniques.
机译：相对于标准的挠痒痒器链束拖网渔船，测试了两种可降低底栖大型动物死亡率的替代刺激技术：纵向电极（脉冲拖网）和纵向链。纵向链在3个物种中比脉冲拖网造成的死亡率更高。标准拖网比线拖网在心chin中的死亡率更高。纵向拖网和标准拖网之间没有显着差异。从纵向拖网到标准拖网，再到脉冲拖网的死亡率下降的趋势在以下方面得到了类似的确认：i）每种拖网类型的重要物种死亡数量，ii）平均死亡率，即纵向链条造成的死亡率比标准拖网高41％，脉冲拖网捕鱼减少了43％，iii）拖网前后的社区差异。与标准拖网捕捞相比，绝大部分物种的纵向死亡率更高，相反，在脉冲拖网捕捞之后，死亡率更低。具有纵向链条而不是交叉发痒器链条的拖网会增加大型动物的影响。相反，尽管在北海南部的底栖试验组合很差的情况下，尽管平均死亡率仍然很高（25％），但脉冲拖网可以减少影响。动力通常较低，而参考地区没有（脉冲）拖网，且居住在较脆弱的生物群中，这将有助于对标准拖网和替代拖网技术的影响进行更高动力的研究。

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