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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46015

Title: Trophic size-structure of sailfish Istiophorus platypterus in eastern Taiwan estimated by stable isotope analysis.
Authors: Tsai CN
Chiang WC
Sun CL
Shao KT
Chen SY
Yeh SZ
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: pelagic food web
ecosystem structure
apex predator
ontogenetic changes
Date: 2014
Issue Date: 2018-04-23T03:00:56Z
Publisher: Journal Fish Biology
Abstract: Abstract: To examine trophic dynamics over different size classes, an isotopic study of sailfish Istiophorus platypterus life-history stages was carried out. Samples were collected from eastern Taiwan and the South China Sea during April 2009 and February 2012. A total of 263 samples (111-245 cm, lower jaw fork length, LLJFL ) were examined for changes in trophic structure in relation to LLJFL by using stable isotope analysis of carbon (δ(13) C) and nitrogen (δ(15) N). The δ(15) N values for I. platypterus ranged from 7·51 to 14·19‰ (mean ± s.d. = 12·06 ± 1·16‰) and the δ(13) C values ranged from -22·04 to -15·48‰ (mean ± s.d. = -17·62 ± 1·10‰). The δ(15) N values were positively dependent on LLJFL (r(2)  = 0·377), whereas δ(13) C were negatively dependent on LLJFL (r(2)  = 0·063). There were significantly different seasonal changes in nitrogen and carbon isotopic concentration, but no significant differences in concentrations between eastern Taiwan and the South China Sea were reported. The trophic level (TL ) of each LLJFL class was correlated, starting from 2·84 TL for size class I (LLJFL  < 140 cm) and reaching 5·03 TL for size class VI (LLJFL > 221 cm). The mean ± s.d. TL was 4·43 ± 0·19 for all samples. The results reveal that I. platypterus occupies a wide range of trophic levels and different size classes occupy different trophic positions in the pelagic ecosystem.
Relation: 84(2) pp.354-371
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46015
Appears in Collections:[海洋生物研究所] 期刊論文

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