Title
What determines dewlap diversity in Anolis lizards? An among-island comparison What determines dewlap diversity in Anolis lizards? An among-island comparison
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Basel ,
Subject
Biology
Source (journal)
Journal of evolutionary biology. - Basel
Volume/pages
22(2009) :2 , p. 293-305
ISSN
1010-061X
ISI
000262516800006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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.
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