What determines dewlap diversity in Anolis lizards? An among-island comparison

Animal signalling systems are extremely diverse as they are under different, often conflicting, selective pressures. A classic textbook example of a diverse signal is the anoline dewlap. Both at the inter- and intraspecific levels, dewlap size, colour, shape and pattern vary extensively. Here, we at...

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Published in:Journal of evolutionary biology 2009-02, Vol.22 (2), p.293-305
Main Authors: VANHOOYDONCK, B, HERREL, A, MEYERS, J.J, IRSCHICK, D.J
Format: Article
Language:English
Subjects:
Animal biology
Animals
Anolis
Anolis sagrei
Biodiversity
Evolutionary biology
Female
Geography
interpopulation variation
Islands
Lacertilia
Leiocephalus
Life Sciences
Lizards - anatomy & histology
Lizards - physiology
Male
natural selection
Phenotype
Reptiles & amphibians
Selection, Genetic
sexual selection
Signal transduction
signals
species recognition
Species Specificity
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container_issue 2
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container_title Journal of evolutionary biology
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creator VANHOOYDONCK, B
HERREL, A
MEYERS, J.J
IRSCHICK, D.J
description Animal signalling systems are extremely diverse as they are under different, often conflicting, selective pressures. A classic textbook example of a diverse signal is the anoline dewlap. Both at the inter- and intraspecific levels, dewlap size, colour, shape and pattern vary extensively. Here, we attempt to elucidate the various factors explaining the diversity in dewlap size and pattern among seven Anolis sagrei populations from different islands in the Bahamas. The seven islands differ in the surface area, number and kind of predators, sexual size dimorphism and Anolis species composition. In addition, we investigate whether selective pressures acting on dewlap design differ between males and females. Whereas dewlap pattern appears to serve a role in species recognition in both sexes, our data suggest that relative dewlap size is under natural and/or sexual selection. We find evidence for the role of the dewlap as a pursuit-deterrence signal in both males and females as relative dewlap size is larger on islands where A. sagrei occurs sympatrically with predatory Leiocephalus lizards. Additionally, in males relatively large dewlaps seem to be selected for in a sexual context, whereas in females natural selection, for instance by other predators than Leiocephalus lizards, appears to constrain relative dewlap size.
doi_str_mv 10.1111/j.1420-9101.2008.01643.x
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source Wiley Online Library Journals Frontfile Complete; Oxford Journals Online
subjects Animal biology
Animals
Anolis
Anolis sagrei
Biodiversity
Evolutionary biology
Female
Geography
interpopulation variation
Islands
Lacertilia
Leiocephalus
Life Sciences
Lizards - anatomy & histology
Lizards - physiology
Male
natural selection
Phenotype
Reptiles & amphibians
Selection, Genetic
sexual selection
Signal transduction
signals
species recognition
Species Specificity
title What determines dewlap diversity in Anolis lizards? An among-island comparison
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