Morphometric Study on stock discrimination of the swimming crabs,Charybdis natator in the Waters Surrounding Taiwan
Date Issued
2005
Date
2005
Author(s)
Li, Ming-cheng
DOI
zh-TW
Abstract
Multivariates morphometric analyses are used in this study for the purpose of examining the stock structure of the swimming crab ( Charybdis natator ) in the waters surrounding Northern and Western Taiwan. A total of 555 crabs, which belong to twenty independent crab samples (two samples from the south of the East China Sea and the rest eighteen samples from the inshore waters of Taiwan Strait) drawn from four main inshore regions nearby Taiwan, were collected from March to November of 2002. Crab body weight in company with other 47 morphometric characters of each specimen were carefully measured and provided for morphometric analyses. Principal components analysis, canonical discriminant analysis and cluster analysis were three major methods to be used in this study for among-independent-samples and between-sex comparisons.
Both canonical discriminant analysis and cluster analysis gave the same results that the swimming crab (male and female alike) resource in the inshore region of Taiwan can be grouped as the group of waters surrounding Peng-Hu islands and the group of inshore regions nearby Western Taiwan. Further, between-sex comparison on the relative growth of morphormetric characters versus carapace width indicates that the sexual dimorphism, particularly in the abdomen segment of the crab, appears very significant in this species of crab.
Subjects
善泳蟳
相對成長
形態測定學
系群判別
relative growth
Multivariates morphometric analyses
stock structure
Charybdis natator
Type
thesis
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