Phenotypic plasticity in insects: the effects of substrate color on the coloration of two ground-hopper species.
Identifieur interne : 000623 ( PubMed/Corpus ); précédent : 000622; suivant : 000624Phenotypic plasticity in insects: the effects of substrate color on the coloration of two ground-hopper species.
Auteurs : Axel Hochkirch ; Jana Deppermann ; Julia GröningSource :
- Evolution & development [ 1525-142X ]
English descriptors
- KwdEn :
- MESH :
- geographic : Germany.
- physiology : Adaptation, Physiological, Body Temperature Regulation, Orthoptera, Pigmentation.
- Analysis of Variance, Animals, Color, Ecosystem, Phenotype, Species Specificity, Temperature.
Abstract
The question of how phenotypic variation is maintained within populations has long been a central issue in evolutionary biology. Most of these studies focused on the maintenance of genetic variability, but the phenotype of organisms may also be influenced by environmental cues experienced during ontogeny. Color polymorphism has received particular attention in evolutionary studies as it has strong fitness consequences. However, if body coloration is influenced by the environment, any conclusions on evolutionary consequences of fitness trade-offs can be misleading. Here we present data from a laboratory experiment on the influence of substrate color on three aspects of the coloration of two ground-hopper species, Tetrix subulata and Tetrix ceperoi. We reared hatchlings either on dark or on light substrates, using a split-brood design. Although the type of pronotal pattern changed mainly in response to nymphal development, the basic color was strongly influenced by the substrate color. In both species, black and dark olive color morphs were found more frequently on the dark substrate, whereas the gray color morph dominated on the light substrate. These findings have considerable implications for our understanding of color morph evolution as they show that color polymorphism may not only be maintained by natural selection acting on discrete color morphs, but also by phenotypic plasticity, which enables organisms to adjust to the environmental conditions experienced during ontogeny. This facultative morphology is opposing to the prevailing view of color morph adaptation, which assumes a purely genetic determination and co-evolution of discrete color morphs with life history traits.
DOI: 10.1111/j.1525-142X.2008.00243.x
PubMed: 18460096
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Most of these studies focused on the maintenance of genetic variability, but the phenotype of organisms may also be influenced by environmental cues experienced during ontogeny. Color polymorphism has received particular attention in evolutionary studies as it has strong fitness consequences. However, if body coloration is influenced by the environment, any conclusions on evolutionary consequences of fitness trade-offs can be misleading. Here we present data from a laboratory experiment on the influence of substrate color on three aspects of the coloration of two ground-hopper species, Tetrix subulata and Tetrix ceperoi. We reared hatchlings either on dark or on light substrates, using a split-brood design. Although the type of pronotal pattern changed mainly in response to nymphal development, the basic color was strongly influenced by the substrate color. In both species, black and dark olive color morphs were found more frequently on the dark substrate, whereas the gray color morph dominated on the light substrate. These findings have considerable implications for our understanding of color morph evolution as they show that color polymorphism may not only be maintained by natural selection acting on discrete color morphs, but also by phenotypic plasticity, which enables organisms to adjust to the environmental conditions experienced during ontogeny. This facultative morphology is opposing to the prevailing view of color morph adaptation, which assumes a purely genetic determination and co-evolution of discrete color morphs with life history traits.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">18460096</PMID><DateCreated><Year>2008</Year><Month>05</Month><Day>07</Day></DateCreated><DateCompleted><Year>2008</Year><Month>08</Month><Day>05</Day></DateCompleted><DateRevised><Year>2008</Year><Month>05</Month><Day>07</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1525-142X</ISSN><JournalIssue CitedMedium="Internet"><Volume>10</Volume><Issue>3</Issue><PubDate><MedlineDate>2008 May-Jun</MedlineDate></PubDate></JournalIssue><Title>Evolution & development</Title><ISOAbbreviation>Evol. 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Here we present data from a laboratory experiment on the influence of substrate color on three aspects of the coloration of two ground-hopper species, Tetrix subulata and Tetrix ceperoi. We reared hatchlings either on dark or on light substrates, using a split-brood design. Although the type of pronotal pattern changed mainly in response to nymphal development, the basic color was strongly influenced by the substrate color. In both species, black and dark olive color morphs were found more frequently on the dark substrate, whereas the gray color morph dominated on the light substrate. These findings have considerable implications for our understanding of color morph evolution as they show that color polymorphism may not only be maintained by natural selection acting on discrete color morphs, but also by phenotypic plasticity, which enables organisms to adjust to the environmental conditions experienced during ontogeny. 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