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Allozyme and AFLP Analyses of Genetic Population Structure in the Hairy Edible Crab Cancer Setosus from the Chilean Coast

Allozyme and AFLP Analyses of Genetic Population Structure in the Hairy Edible Crab Cancer... Management plans and stock assessment of exploited marine invertebrates should consider information on the genetic population structure of the species. In this context, the genetic diversity within and between populations of the commercially exploited hairy edible crab Cancer setosus was investigated using allozyme and AFLP (Amplified Fragment Length Polymorphism) markers, covering a range of approximately 2500 km along the Chilean coast. Genetic diversity estimates within populations, such as polymorphism and average expected heterozygosity, were low from two polymorphic allozyme loci, PGM-1 and EST-1 ( P 0.99 = 8.7 %; H E = 2.5 %) but much higher for 190 AFLP loci ( P 0.99 = 52 %; H E = 18.7 %). Nevertheless, differentiation among samples was statistically significant for allozymes ( F ST = 0.026; P < 0.001), but not for AFLPs (AMOVA ϕ PT = 0.007; P = 0.118). Several possible causes of these differences are discussed in an evolutionary and oceanographic framework. AFLP also identified a sex-linked marker, present in 96 % of females but only 9 % of males. Relatively little is known about sex-determination in decapods, but these data suggest that in C. setosus , the mechanism is primarily genetic and that females may be the heterogametic sex. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Crustacean Biology Brill

Allozyme and AFLP Analyses of Genetic Population Structure in the Hairy Edible Crab Cancer Setosus from the Chilean Coast

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References (5)

Copyright
The Crustacean Society
Subject
CONTENTS
ISSN
0278-0372
eISSN
1937-240X
DOI
10.1651/0278-0372(2003)023(0486:AAAAOG)2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

Management plans and stock assessment of exploited marine invertebrates should consider information on the genetic population structure of the species. In this context, the genetic diversity within and between populations of the commercially exploited hairy edible crab Cancer setosus was investigated using allozyme and AFLP (Amplified Fragment Length Polymorphism) markers, covering a range of approximately 2500 km along the Chilean coast. Genetic diversity estimates within populations, such as polymorphism and average expected heterozygosity, were low from two polymorphic allozyme loci, PGM-1 and EST-1 ( P 0.99 = 8.7 %; H E = 2.5 %) but much higher for 190 AFLP loci ( P 0.99 = 52 %; H E = 18.7 %). Nevertheless, differentiation among samples was statistically significant for allozymes ( F ST = 0.026; P < 0.001), but not for AFLPs (AMOVA ϕ PT = 0.007; P = 0.118). Several possible causes of these differences are discussed in an evolutionary and oceanographic framework. AFLP also identified a sex-linked marker, present in 96 % of females but only 9 % of males. Relatively little is known about sex-determination in decapods, but these data suggest that in C. setosus , the mechanism is primarily genetic and that females may be the heterogametic sex.

Journal

Journal of Crustacean Biology – Brill

Published: May 1, 2003

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