Habitat choice by allelic variants in Xiphophorus variatus (Pisces

Poeciliidae) and implications for maintenance of genetic polymorphism

Research output: Contribution to journalArticle

Abstract

Stream pools in NE Mexico exhibit gradients in dissolved oxygen (DO) concentration with low DO at the upstream ends. These pools contain populations of variable platyfish which are polymorphic at an autosomal locus that affects tailspot pigmentation. Adult males of the cut-crescent morph have a lower metabolic rate than wild type males. Among adult males, all morphs were found in equal proportions at the upstream and downstream ends of the pools, except cut-crescents, which were distributed preferentially toward the upstream ends. The opposite distributional pattern was found among adult females. Habitat choice may contribute to the stability of the tailspot polymorphism, especially because preferences differing between the sexes can lead to disassortative mating -from Author

Original languageEnglish (US)
Pages (from-to)1338-1345
Number of pages8
JournalEvolution
Volume44
Issue number5
StatePublished - 1990

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Cyprinodontiformes
Poeciliidae
Genetic Polymorphisms
Pisces
Ecosystem
polymorphism
Maintenance
genetic polymorphism
dissolved oxygen
habitat
habitats
Oxygen
Pigmentation
morphs
Mexico
pigmentation
loci
gender
Population
Xiphophorus variatus

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)
  • Genetics(clinical)
  • Ecology
  • Genetics

Cite this

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abstract = "Stream pools in NE Mexico exhibit gradients in dissolved oxygen (DO) concentration with low DO at the upstream ends. These pools contain populations of variable platyfish which are polymorphic at an autosomal locus that affects tailspot pigmentation. Adult males of the cut-crescent morph have a lower metabolic rate than wild type males. Among adult males, all morphs were found in equal proportions at the upstream and downstream ends of the pools, except cut-crescents, which were distributed preferentially toward the upstream ends. The opposite distributional pattern was found among adult females. Habitat choice may contribute to the stability of the tailspot polymorphism, especially because preferences differing between the sexes can lead to disassortative mating -from Author",
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