Most studies about benthic community use small-scale sampling methods focused on the infauna such as grabs or box-corers. The benthic data collected by scientific trawl surveys in all European waters, in the frame of the Common Fishery Policy Data Collection Multiannual Program, can be used to study the impact of large-scale fisheries such as trawling. However, the catchability of trawls is very dependent on the nature of the seabed as well as resulting ground-gear adaptations. Due to its non-destructive nature and its ability to focus on benthic macro-epifauna, towed video sampling appears to be a good alternative to monitor the impact of trawling on benthic communities. In the present work, we studied the influence of fishery induced seabed abrasion and video characteristics on nine indices, which can be used to monitor the effect of trawling on benthic communities, was studied. Among them, three indices specific to fishery effect detection based on biological traits appeared to be the best performing benthic indices with video data: modified-Trawling Disturbance Index, partial-Trawling Disturbance Index, and modified sensitivity index. The effectiveness of these indices to monitor the effect of trawling was evaluated and compared between trawl and video sampling. This work has highlighted that video sampling could be a good alternative, or at least a complementary method, to scientific trawling to monitor the effect of trawling on benthic communities in European waters.

中文翻译：

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评估拖网对底栖巨型动物的影响：视频调查与科学拖网的比较研究

大多数关于底栖生物群落的研究使用小规模抽样方法，重点是动物群，如抓斗或箱形取芯器。在共同渔业政策数据收集多年计划的框架内，通过科学拖网调查在所有欧洲水域收集的底栖数据可用于研究拖网等大型渔业的影响。然而，拖网的可捕获性在很大程度上取决于海床的性质以及由此产生的地面设备适应性。由于其非破坏性和专注于底栖大型表皮动物的能力，拖曳视频采样似乎是监测拖网捕捞对底栖生物群落影响的一个很好的选择。在目前的工作中，我们研究了渔业引起的海底磨损和视频特征对九个指标的影响，可用于监测拖网捕捞对底栖生物群落的影响进行了研究。其中，基于生物性状的渔业效应检测的三个指标似乎是视频数据中表现最好的底栖生物指标：修正拖网干扰指数、部分拖网干扰指数和修正敏感性指数。评估了这些指标监测拖网捕捞效果的有效性，并在拖网和视频采样之间进行了比较。这项工作强调了视频采样可能是科学拖网捕捞的一种很好的替代方法，或者至少是一种补充方法，以监测拖网捕捞对欧洲水域底栖生物群落的影响。基于生物学特征的渔业影响检测的三个指标似乎是视频数据中表现最好的底栖生物指标：改良拖网干扰指数、部分拖网干扰指数和改良敏感性指数。评估了这些指标监测拖网捕捞效果的有效性，并在拖网和视频采样之间进行了比较。这项工作强调了视频采样可能是科学拖网捕捞的一种很好的替代方法，或者至少是一种补充方法，以监测拖网捕捞对欧洲水域底栖生物群落的影响。基于生物学特征的渔业影响检测的三个指标似乎是视频数据中表现最好的底栖生物指标：改良拖网干扰指数、部分拖网干扰指数和改良敏感性指数。评估了这些指标监测拖网捕捞效果的有效性，并在拖网和视频采样之间进行了比较。这项工作强调了视频采样可能是科学拖网捕捞的一种很好的替代方法，或者至少是一种补充方法，以监测拖网捕捞对欧洲水域底栖生物群落的影响。