首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Carbon source and trophic position of pelagic fish in coastal waters of south-eastern Izu Peninsula,Japan, identified by stable isotope analysis
Authors:Noriyuki Takai  Noriyuki Hirose  Takuya Osawa  Kazuyuki Hagiwara  Takahito Kojima  Yuji Okazaki  Tomohiro Kuwae  Toru Taniuchi  Kiyoshi Yoshihara
Institution:Shimoda Marine Biological Station, College of Bioresource Sciences, Nihon University, Shimoda, Shizuoka 415-0014,;Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa 252-8510,;Tohoku National Fisheries Research Institute (TNFRI), Shiogama, Miyagi 985-0001, and;Port and Airport Research Institute (PARI), Yokosuka, Kanagawa 239-0826, Japan
Abstract:ABSTRACT:   It is important to clarify trophic dynamics in marine ecosystems for management of the fishing ground. Organic carbon sources and trophic position of pelagic fishes in the coastal waters of the south-eastern Izu Peninsula, Japan, were examined on the basis of carbon and nitrogen stable isotope distributions. The δ13C of the fishes was mostly distributed from ?19 to ?16‰ for nektonic fishes (13 species of adults and immatures) and planktonic fishes (10 species of larvae and juveniles), close to the δ13C values of particulate organic matter and planktonic decapods. These δ13C signatures for the inhabitants of the water column were in contrast with the high δ13C values (mainly ?16 to ?13‰) for demersal fishes of Scorpaeniformes and benthic polychaetes collected in the surf zone. These results indicate that nektonic and planktonic fishes depend on phytoplankton for carbon supply. The δ15N signatures suggest that the trophic position ranged 3.1–4.5 for the nektonic fishes and 2.9–3.7 for the planktonic fishes, premised on trophic level 3 for larval Japanese anchovy Engraulis japonicus . Thus, planktivorous fishes should be mainly assigned to trophic levels 3 and 4 in this area.
Keywords:carbon source  δ13C  δ15N  Izu Peninsula  pelagic fish  stable isotope  trophic position
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号