The variability in otolith shape of the tapertail anchovy Coilia ectenes was investigated as a tool for identifying its different ecotypes. The outlines of 350 sagittal otoliths of known ecotypes collected from seven sampling areas, covering most of the distributional range of the species in the Yangtze Basin, were digitized and analyzed. Canonical Discriminant Analysis (CDA) of the shape indices and Fourier descriptors pooled together showed three distinct clusters of individuals representing anadromous, land-locked, and freshwater-resident ecotypes. A test of the classification success of CDA indicated that individuals of the freshwater-resident ecotype could be efficiently discriminated from either the anadromous or the landlocked ecotypes. A high rate of misclassification of the anadromous ecotype as the land-locked ecotype indicated some weakness when distinguishing individuals of these two ecotypes from each other. Average otolith shapes of the anadromous and the land-locked ecotypes shared similarities in the form of the rostrum and antirostrum, while the freshwater-resident ecotype showed marked dissimilarity from them. The information generated in this study is useful in ecotype-adapted resource assessment and management of C. ectenes in the Yangtze Basin. (C) 2012 Elsevier B.V. All rights reserved.
英文摘要:
The variability in otolith shape of the tapertail anchovy Coilia ectenes was investigated as a tool for identifying its different ecotypes. The outlines of 350 sagittal otoliths of known ecotypes collected from seven sampling areas, covering most of the distributional range of the species in the Yangtze Basin, were digitized and analyzed. Canonical Discriminant Analysis (CDA) of the shape indices and Fourier descriptors pooled together showed three distinct clusters of individuals representing anadromous, land-locked, and freshwater-resident ecotypes. A test of the classification success of CDA indicated that individuals of the freshwater-resident ecotype could be efficiently discriminated from either the anadromous or the landlocked ecotypes. A high rate of misclassification of the anadromous ecotype as the land-locked ecotype indicated some weakness when distinguishing individuals of these two ecotypes from each other. Average otolith shapes of the anadromous and the land-locked ecotypes shared similarities in the form of the rostrum and antirostrum, while the freshwater-resident ecotype showed marked dissimilarity from them. The information generated in this study is useful in ecotype-adapted resource assessment and management of C. ectenes in the Yangtze Basin. (C) 2012 Elsevier B.V. All rights reserved.
1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Biodivers & Conservat Aquat Organisms, Wuhan 430072, Hubei, Peoples R China 2.S China Normal Univ, Sch Life Sci, Guangdong Prov Key Lab Hlth & Safe Aquaculture, Key Lab Ecol & Environm Sci Guangdong Higher Educ, Guangzhou 510631, Guangdong, Peoples R China 3.Chinese Acad Fishery Sci, E China Sea Fisheries Res Inst, Lab Fishery Resources, Shanghai 200090, Peoples R China 4.Natl Inst Oceanog, Reg Ctr, Kochi 682018, Kerala, India 5.Chinese Acad Sci, Inst Hydrobiol, Huaian Res Ctr, Huaian 223002, Jiangsu, Peoples R China 6.Virginia Polytech Inst & State Univ, Dept Fish & Wildlife Conservat, Blacksburg, VA 24061 USA
Recommended Citation:
Radhakrishnan, K. V.; Li, Yuxuan; Jayalakshmy, K. V.; Liu, Ming; Murphy, Brian R.; Xie, Songguang.Application of otolith shape analysis in identifying different ecotypes of Coilia ectenes in the Yangtze Basin, China,FISHERIES RESEARCH,2012,125():156-160
