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首页> 外文期刊>ICES Journal of Marine Science >Scavenging on trawled seabeds can modify trophic size structure of bottom-dwelling fish
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Scavenging on trawled seabeds can modify trophic size structure of bottom-dwelling fish

机译：在被拖网的海床上清除可能会改变海底鱼类的营养大小结构

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摘要

Disturbance by towed bottom-fishing gears often kills larger sensitive benthos, leading to changes in the abundance, size, and species composition of benthic communities. Short-term availability of trawl-damaged prey, and longer-term shifts in benthic prey community composition, both have the potential to affect feeding opportunities and realized dietary p of bottom-feeding (benthivorous) fish. To investigate these effects of bottom-fishing activity (by otter trawls, beam trawls, and dredges) on the feeding of benthivorous fish, we compared the trophic level at body size and diets of four species in areas of the Celtic Sea subject to low, intermediate, and high fishing activity. Trophic level was estimated using nitrogen stable isotope analysis, and fishing activity was quantified with vessel monitoring system (VMS) data. For whiting (Merlangius merlangus) of all sizes, trophic level was slightly lower in areas of higher fishing activity. After accounting for the results of the diet analysis, we concluded that this reflected increased scavenging of benthic invertebrates in more intensively fished areas. For megrim (Lepidorhombus whiffiagonis), the rate of increase in trophic level with size was lower with increasing fishing activity, implying that megrim may also substitute fish with lower-trophic invertebrates that can be scavenged in more intensively fished areas. For plaice (Pleuronectes platessa) and lemon sole (Microstomus kitt), no significant effects of fishing activity on trophic level were detected. We conclude that differences in the intensity of fishing activity with towed bottom gears had small but variable effects of the trophic size structure of the four species, and that this primarily reflected scavenging rather than diet changes following longer-term shifts in composition of the prey community.
机译：拖曳的底部捕鱼装置造成的干扰通常会杀死较大的敏感底栖生物，导致底栖生物群落的数量，大小和物种组成发生变化。拖网损坏的猎物的短期供应以及底栖猎物群落组成的长期变化都可能影响进食机会，并实现底喂（食肉）鱼的日粮。为了研究底栖捕捞活动（由水獭拖网，beam拖网和挖泥船）对底栖鱼类摄食的影响，我们比较了凯尔特海地区低体重，四种鱼类的体型和饮食营养水平，中度和高钓鱼活动。使用氮稳定同位素分析估算营养水平，并使用船只监测系统（VMS）数据量化捕鱼活动。对于各种规模的白垩纪（Merlangius merlangus），在较高捕捞活动地区的营养水平略低。考虑到饮食分析的结果后，我们得出结论，这反映了在集约化捕鱼区对底栖无脊椎动物的清除增加。对于捕蝇类（Lepidorhombus whiffiagonis），随着捕捞活动的增加，营养水平随大小的增加速率较低，这意味着捕蝇类也可以用低营养的无脊椎动物代替鱼类，这些无脊椎动物可以在集约化捕鱼区进行捕捞。对于（Pleuronectes platesa）和柠檬lemon（Microstomus kitt），没有发现捕捞活动对营养水平有显着影响。我们得出的结论是，拖曳底具的捕捞活动强度差异对这四个物种的营养大小结构影响较小，但变化不定，这主要反映了捕食群落组成发生长期变化后的清除，而不是饮食变化。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第2期|398-405|共8页
  • 作者

    Samuel Shephard; Coilin Minto; Melanie Zoelck; Simon Jennings; Deirdre Brophy; David Reid;

  • 作者单位

    School of Biological Sciences, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK;

    Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

    Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

    Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK;

    Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

    Marine Institute, Rinville, Oranmore, County Galway, Ireland;

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  • 正文语种 eng
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  • 关键词

    benthos; δ~(15)N; food chain; size structure; trawling;

    机译：便当δ〜（15）N;食物链;尺寸结构;拖网;

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