Variations in fish community composition and trophic structure under multiple drivers in the Beibu Gulf
文献类型： 外文期刊
作者： Peng, Shuai 1 ; Wang, Xuehui 1 ; Du, Feiyan 1 ; Sun, Dianrong 1 ; Wang, Yuezhong 1 ; Chen, Pimao 1 ; Qiu, Yongsong 1 ;
作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou, Peoples R China
2.Shanghai Ocean Univ, Coll Marine Sci, Shanghai, Peoples R China
3.Natl Digital Fisheries Marine Ranching Innovat Sub, Guangzhou, Peoples R China
4.Minist Agr & Rural Affairs, Key Lab Marine Ranching, Guangzhou, Peoples R China
5.Minist Agr & Rural Affairs, Sci Observing & Expt Stn South China Sea Fishery R, Guangzhou, Peoples R China
6.Guangdong Engn Technol Res Ctr Marine Recreat Fish, Guangzhou, Peoples R China
7.Chinese Acad Fishery Sci, Key Lab Marine Ranching Technol, Guangzhou, Peoples R China
8.Sanya Trop Fisheries Res Inst, Sanya, Peoples R China
关键词： fish community; diversity; trophic level; human activities; Beibu Gulf; South China Sea
期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：3.7； 五年影响因子：4.7 ）
ISSN：
年卷期： 2023 年 10 卷
页码：
收录情况： SCI
摘要： IntroductionBeibu Gulf is a semi-enclosed bay with important ecological and economic value of the northwestern South China Sea (SCS). It proved to be a stressed ecosystem and therefore clearly vulnerable to further external disturbances. MethodsData from 26 fishery bottom trawl surveys in the Beibu Gulf from 2006 to 2018 are analyzed to reveal changes in the fish abundance, dominant species composition, diversity, mean trophic level (MTL), and fishing-in-balance (FiB) index. ResultsFish abundance decreased significantly (p< 0.05) with increased anthropogenic disturbance (e.g., fishing intensity and land-derived pollutants), with catch per unit effort (CPUE) decreasing from 40.69 kg center dot h(-1) in 2006 to 15.84 kg center dot h(-1) in 2018. Dominant species composition has changed dramatically from 2006 to 2018, with fish communities shifting from demersal to pelagic species, and from large and high-trophic-level species to small and low-trophic-level species. Meanwhile, Margalef's richness and Shannon-Wiener diversity indexes trend downward. The MTL declines from 3.82 in 2006 to 3.71 in 2018 (at 0.08 trophic level per decade), and decreasing with the decrease of the proportion of high-trophic fish and demersal fish in total catch (p< 0.05). A FiB index tends to be less than 0, this index declines with decreasing MTL and fish abundance (p< 0.05). DiscussionOverall, fish stocks in the Beibu Gulf continue to decline and are currently overexploited. Multiple external disturbances, such as fishing (including overfishing, dominance of trawl fishery, and 'skipper effect'), habitat disturbance, pollution, and temperature changes, may have contributed to significant changes in fish communities and trophic structure in the Beibu Gulf.
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