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稳定同位素揭示拖网渔业对商业开发物种饮食的影响。

Stable isotopes reveal the effect of trawl fisheries on the diet of commercially exploited species.

机构信息

Mediterranean Institute for Advanced Studies (UIB-CSIC), C/ Miquel Marquès, 21, 07190 Esporles, Balearic Islands, Spain.

Instituto Español de Oceanografía, Centro Oceanográfico de Baleares, Moll de Ponent s/n, 07015, Palma de Mallorca, Spain.

出版信息

Sci Rep. 2017 Jul 24;7(1):6334. doi: 10.1038/s41598-017-06379-6.

DOI:10.1038/s41598-017-06379-6
PMID:28740093
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5524968/
Abstract

Bottom trawling can change food availability for benthivorous demersal species by (i) changing benthic prey composition through physical seabed impacts and (ii) by removing overall benthic consumer biomass increasing the net availability of benthic prey for remaining individuals. Thus trawling may both negatively and positively influence the quantity and quality of food available. Using δ C and δ N we investigated potential diet changes of three commercially exploited species across trawling gradients in the Kattegat (plaice, dab and Norway lobster (Nephrops)) and the Irish Sea (Nephrops). In the Kattegat, trawling affected primarily the biomass of benthic consumers, lowering competition. Nephrops showed significant positive relationships for δ C and a domed relationship for δ N with trawling. In the Irish Sea, intense trawling had a negative effect on benthic prey. δ C and δ N thus showed the inverse relationships to those observed in the Kattegat. Plaice from the Kattegat, showed a significant relationship with trawling intensity for δ C, but not for δ N. No relationship was found for dab. Changes of δ C and δ N correlated with changes in condition of species. The results show that the removal of demersal competitors and benthos by trawling can change the diets of commercial species, ultimately affecting their body condition.

摘要

底拖网捕捞通过以下两种方式改变底栖生物的食物可利用性

(i) 通过物理海底影响改变底栖猎物的组成，(ii) 通过去除底栖消费者的整体生物量，增加底栖猎物对剩余个体的净可利用性。因此，拖网捕捞可能对食物的数量和质量产生负面影响和积极影响。利用 δC 和 δN，我们调查了 Kattegat（欧鲽、无须鳕和挪威海螯虾 (Nephrops)) 和爱尔兰海（挪威海螯虾）中三种商业开发物种在拖网梯度下的潜在饮食变化。在卡特加特，拖网捕捞主要影响底栖消费者的生物量，降低了竞争。Nephrops 表现出与 δC 显著正相关，与 δN 呈拱形关系。在爱尔兰海，密集的拖网捕捞对底栖猎物产生了负面影响。因此，δC 和 δN 显示出与在卡特加特观察到的相反的关系。来自卡特加特的欧鲽与拖网强度对 δC 表现出显著关系，但对 δN 没有关系。无须鳕没有发现这种关系。δC 和 δN 的变化与物种状况的变化相关。结果表明，底拖网捕捞去除底栖竞争者和底栖生物可以改变商业物种的饮食，最终影响它们的身体状况。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/651b4985e4ee/41598_2017_6379_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/564cf6431662/41598_2017_6379_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/02b3099870a4/41598_2017_6379_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/bbd234d596c1/41598_2017_6379_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/c697fd7a75a7/41598_2017_6379_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/651b4985e4ee/41598_2017_6379_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/564cf6431662/41598_2017_6379_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/02b3099870a4/41598_2017_6379_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/bbd234d596c1/41598_2017_6379_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/c697fd7a75a7/41598_2017_6379_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4032/5524968/651b4985e4ee/41598_2017_6379_Fig5_HTML.jpg

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