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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2012 Vol.31 No.5

Population Differentiation of Xenocypris argentea in Poyang Lake and Adjacent Drainages
Author of the article:HU Yu-ting1, 2, 3, YANG Shao-rong1, 2, 3, LI Ming-zheng1, 2, 3, CAO Wen-xuan1, 2*, LIU Huan-zhang1,
Author's Workplace:(1. Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; 2. The Key Laboratory of Aquatic Biodiversity and Conservation, Chinese Academy of Sciences, Wuhan 430072, China; 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
Key Words:Xenocypris argentea; Poyang Lake; morphological variation; Cyt b; population differentiation
Abstract:

 In the present study, 228 samples of Xenocypris argentea were collected from 7 localities of Poyang Lake and its adjacent drainages (Ganjiang River and Dongting Lake), which were analyzed through morphological and molecular methods to investigate population differentiation. The results of Principal Component Analysis showed that populations morphological differences of X. argentea, especially the samples from Ganjiang River was significantly distinguished from the others. Discriminatory analysis showed that the discriminant accuracy of populations were high, particularly for Ganjiang population, which was 100%. Morphological analysis indicated that there were differences among populations. The 1131 bp of mitochondrial cytochrome b (Cyt b) gene sequences of all X. argentea individuals were used for molecular differentiation analysis. Among the 228 sequences, 107 haplotypes were identified with 62 parsimony informative sites detected. All the 7 populations were characterized with high haplotype diversity (0.96471~0.99310) and low nucleotide diversity (0.00419~0.00560). Analysis of molecular variance (AMOVA) of the 7 populations showed that the genetic variance mainly presented in individuals within populations, and there were no genetic differences among populations. Exact test also showed that the haplotype distribution had no significant difference between each pairs of populations. Therefore, based on molecular analysis, the investigated populations showed extensive gene flow to each other and no genetic differences. This inconsistence between morphological and molecular results was probably ascribed to populations’ morphological adaptations to different environments in the course of growth and development.

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