期刊
ECOLOGICAL INDICATORS
卷 70, 期 -, 页码 348-356出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecolind.2016.06.029
关键词
Bohai Strait; Fishing periods; Predation; Stable isotopes; Trophic levels
资金
- Public Science and Technology Research Funds Project of Ocean [201305009-4, 201305030]
- NSFC-Shandong Joint Funds Project Marine Ecology and Environmental Sciences [U1406403]
- National Natural Science Foundation of China [41476091]
- Qingdao Municipal Science and Technology Plan Project [13-1-4-234-jch]
- Qingdao Government
Fishing is the most widespread human exploitation of marine resources, which has an annual cyclical influence on aquatic species in Chinese offshore waters. This study used carbon and nitrogen isotopic ratios as tracers to reveal the changes in trophic level and dietary composition of offshore organisms during four cruises in March, June, August and November 2014. The results indicated that the trophic levels of fishes declined during two fishing periods, from March (average trophic level = 3.36) to June (3.01), and from August (2.99) to November (2.57), while most invertebrates did not show this trend. The self-restoring ability of this ecosystem was reflected in the trophic level changes after the closed fishing season (from June 1 to September 1). The trophic levels of fishes remained stable, and some species even recovered such as Enchelyopus elongates (trophic level increased from 2.84 in June to 2.86 in August), Cryptocentrus filifer (from 3.10 to 3.12), and Ernogrammus hexagrammus (from 2.91 to 2.96). According to the trophic results, we selected the invertebrates Octopus minor and Asterias arnurensis from the top trophic levels for dietary composition analysis. The composition of their diets changed significantly after fishing periods, and the proportions of some smaller and non-commercial species increased, such as No toacmea schrenckii and Chlorostoma rustica. After the closed fishing season, the larger and commercial species contributed a greater proportion to their diet composition. These results indicated that the closed fishing season should be prolonged to give the ecosystem enough time to restore itself and further halt the trend of this fishery towards environment deterioration. (C) 2016 Elsevier Ltd. All rights reserved.
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