Evidence of constrained phenotypic evolution in a cryptic species complex of Agamid lizards

Smith, Katie L., Harmon, Luke J., Shoo, Luke P. and Melville, Jane (2011) Evidence of constrained phenotypic evolution in a cryptic species complex of Agamid lizards. Evolution, 65 4: 976-992. doi:10.1111/j.1558-5646.2010.01211.x


Author Smith, Katie L.
Harmon, Luke J.
Shoo, Luke P.
Melville, Jane
Title Evidence of constrained phenotypic evolution in a cryptic species complex of Agamid lizards
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
1558-5646
Publication date 2011-04
Sub-type Article (original research)
DOI 10.1111/j.1558-5646.2010.01211.x
Volume 65
Issue 4
Start page 976
End page 992
Total pages 17
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Collection year 2012
Language eng
Formatted abstract
Lineages that exhibit little morphological change over time provide a unique opportunity to explore whether nonadaptive or adaptive processes explain the conservation of morphology over evolutionary time scales. We provide the most comprehensive evaluation to date of the evolutionary processes leading to morphological similarity among species in a cryptic species complex, incorporating two agamid lizard species (Diporiphora magna and D. bilineata). Phylogenetic analysis of mitochondrial (ND2) and nuclear (RAG-1) gene regions revealed the existence of eight deeply divergent clades. Analysis of morphological data confirmed the presence of cryptic species among these clades. Alternative evolutionary hypotheses for the morphological similarity of species were tested using a combination of phylogenetic, morphological, and ecological data. Likelihood model testing of morphological data suggested a history of constrained phenotypic evolution where lineages have a tendency to return to their medial state, whereas ecological data showed support for both Brownian motion and constrained evolution. Thus, there was an overriding signature of constrained evolution influencing morphological divergence between clades. Our study illustrates the utility of using a combination of phylogenetic, morphological, and ecological data to investigate evolutionary mechanisms maintaining cryptic species.
Keyword Agamidae
Morphological evolution
Morphological stasis
Nonadaptive
Phylogenetics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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