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Morph-specific variation in intersexual genetic correlations in an intra-specific mimicry system

Author:
  • Jessica Abbott
  • Erik Svensson
Publishing year: 2010
Language: English
Pages: 105-118
Publication/Series: Evolutionary Ecology Research
Volume: 12
Issue: 1
Document type: Journal article
Publisher: Evolutionary Ecology Ltd

Abstract english

Background: Positive intersexual genetic correlations are typically viewed as constraining the evolution of sexual dimorphism, when traits are subject to sexually antagonistic selection. Our study species, the damselfly Ischnura elegans, has a female-limited colour polymorphism with three female colour morphs (males are monomorphic), one of which is considered to be a male mimic. Questions: Are there morph-specific differences in the magnitude of intersexual genetic correlations in I. elegans? Specifically, do male-mimic (Androchrome) females have higher intersexual genetic correlations for morphological traits than non-mimic (Infuscans) females'? Methods: We collected copulating pairs in the field and raised offspring from these pairs in the laboratory. We measured five morphological traits in both parent and offspring generations and investigated their heritabilities and genetic correlations. Results: We found a negative overall relationship between the degree of sexual dimorphism for a trait and its intersexual genetic correlation. But the magnitude and direction of intersexual genetic correlations depended on the female morph. As expected, male mimic (Androchrome) females had higher intersexual genetic correlations. In addition, the genetic correlations between the morphs were in all cases significantly lower than unity. Male mimic (Androchrome) females had higher mother son covariances than the non-mimic (Infuscans) morph, and this difference is the proximate explanation for the difference in intersexual genetic correlations between the morphs.

Keywords

  • Biological Sciences
  • dimorphism
  • sexual
  • polymorphism
  • male mimic
  • damselflies
  • Ischnura elegans

Other

Published
  • ISSN: 1522-0613
erik_svensson
E-mail: erik [dot] svensson [at] biol [dot] lu [dot] se

Professor

Evolutionary ecology

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden