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The role of post-natal ontogeny in the evolution of phenotypic diversity in Podarcis lizards.
Piras, P; Salvi, D; Ferrara, G; Maiorino, L; Delfino, M; Pedde, L; Kotsakis, T.
Afiliación
  • Piras P; Center for Evolutionary Ecology, Rome, Italy. ppiras@uniroma3.it
J Evol Biol ; 24(12): 2705-20, 2011 Dec.
Article en En | MEDLINE | ID: mdl-21954968
ABSTRACT
Understanding the role of the developmental pathways in shaping phenotypic diversity allows appreciating in full the processes influencing and constraining morphological change. Podarcis lizards demonstrate extraordinary morphological variability that likely originated in short evolutionary time. Using geometric morphometrics and a broad suite of statistical tests, we explored the role of developmental mechanisms such as growth rate change, ontogenetic divergence/convergence/parallelism as well as morphological expression of heterochronic processes in mediating the formation of their phenotypic diversity during the post-natal ontogeny. We identified hypermorphosis - the prolongation of growth along the same trajectory - as the process responsible for both intersexual and interspecific morphological differentiation. Albeit the common allometric pattern observed in both sexes of any species constrains and canalizes their cephalic scales variation in a fixed portion of the phenotypic space, the extended growth experienced by males and some species allows them to achieve peramorphic morphologies. Conversely, the intrasexual phenotypic diversity is accounted for by non-allometric processes that drive the extensive morphological dispersion throughout their ontogenetic trajectories. This study suggests a model of how simple heterochronic perturbations can produce phenotypic variation, and thus potential for further evolutionary change, even within a strictly constrained developmental pathway.
Asunto(s)

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Fenotipo / Evolución Biológica / Lagartos Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: J Evol Biol Asunto de la revista: BIOLOGIA Año: 2011 Tipo del documento: Article País de afiliación: Italia

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Fenotipo / Evolución Biológica / Lagartos Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: J Evol Biol Asunto de la revista: BIOLOGIA Año: 2011 Tipo del documento: Article País de afiliación: Italia