文章基本信息

标题：Relationship Between Length of Food Chain of the South-west Caspian Sea and the Abundance of Captured Fish
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作者：A. Mirzajani ; A. H. Hamidian ; M. Karami 等
期刊名称：Iranian Journal of Applied Ecology
印刷版ISSN：2476-3128
电子版ISSN：2476-3217
出版年度：2017
卷号：6
期号：2
页码：15-26
DOI：10.18869/acadpub.ijae.6.2.15
出版社：Isfahan University of Technology
摘要：The fishery activities affect the lives of millions of people who live near the south of Caspian Sea, where the aquatic stocks have sophisticated ecological relationships. In this study, carbon and nitrogen stable isotope technique was applied as an ecological tool to interpret the fish catch values of different areas in relation to food chain. The average values of Captured bony fishes in six regions of Guilan province, including Astara, Hashtpar, Anzali, Kiashahr, Langroud and Chaboksar, were compared. For calculating food chain length using nitrogen stable isotope; Cerastoderma glucaum was considered as primary consumers for baseline values and two species Sander lucioperca and Alosa braschnokowi as top predators. The results showed that stable isotope ratios of δ 13 C and δ 15 N varied in different regions. The δ 13 C value was the lowest and the highest in Astara and Chaboksar (-21.7 ‰ and -20.1 ‰, respectively) while the δ 15 N value was the highest (5.7 ‰) in Astara and the lowest (4.2 ‰) in Chaboksar and Kiashahr. The highest calculated food chain length among the regions belonged to Kiashahr. Although a schematic correlation was observed between the aboundance of Captured fish and the length of food chain in different regions, the role of releasing millions of fish fries annually is also crucial in fish stock rehabilitation.
关键词：Stable isotope; Carbon and nitrogen; Trophic level; Fishing