Demographic and life history characteristics influence the cytonuclear composition of mosquitofish populations

By:  and 
Edited by: A. Beaumont

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Abstract

Experimental laboratory crosses and population experiments reveal significant differences in individual life-history traits and population demography between two related species of mosquitofish, Gambusia affinis and G. holbrooki. With respect to life-history traits, progeny from G. holbrooki exhibit larger size at birth and earlier age at sexual maturity than do progeny from G. affinis parents. With respect to demography, populations of G. holbrooki exhibit higher recruitment and carrying capacity and loser overwinter mortality than do populations of G. affinis. These differences help t explain the dramatic changes in cytonuclear genotype frequency observed in replicated experimental hybrid populations of Gambusia monitored over 52 weeks. These experimental results are interpreted in the context of introgression patterns previously studied indirectly from distributions of cytonuclear genotypes in a natural mosquitofish hybrid zone.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Demographic and life history characteristics influence the cytonuclear composition of mosquitofish populations
Chapter 5.5
ISBN 978-0-412-49370-6
Year Published 1994
Language English
Publisher Chapman and Hall
Publisher location London, UK
Contributing office(s) Alaska Science Center
Description 11 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Genetics and evolution of aquatic organisms
First page 280
Last page 290
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