Article (Scientific journals)
Neoteny and progenesis as two heterochronic processes involved in paedomorphosis in Triturus alpestris (Amphibia: Caudata)
Denoël, Mathieu; Joly, Pierre
2000In Proceedings of the Royal Society. Biological Sciences, 267 (1451), p. 1481-1485
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Keywords :
Heterochrony; Paedomorphosis; Neoteny; Progenesis; Development; Evolution; Amphibian; Salamandridae; Mesotriton alpestris; Alpine newt; Age structure; Size structure; Processes; Demography; Skeletochronology; First reproduction; Early maturity; Population size; Ichthyosaura alpestris; Lac de la cabane; Apennines; Growth; Ichthyosaura alpestris alpestris; Ichthyosaura alpestris apuanus; France; Italy
Abstract :
[en] Current theories on the evolution of paedomorphosis suppose that several ontogenetic pathways have appeared according to different selective pressures. The aim of this study was to find out whether two distinct processes can lead to paedomorphosis in the Alpine newt, Triturus alpestris. In this respect, we compared age structures of paedomorphic and metamorphic individuals in two newt populations where the two forms lived syntopically. Whereas paedomorphosis resulted in a slower rate of somatic development in one population, it resulted in an acceleration of sexual maturation in the other population. These processes correspond to neoteny and progenesis, respectively. These results suggest that phenotypic plasticity can result from contrasted ontogenetic pathways between two populations of the same species. They give support to models that consider gonadic development as the target of selection under different environmental pressures.
Disciplines :
Zoology
Life sciences: Multidisciplinary, general & others
Environmental sciences & ecology
Author, co-author :
Denoël, Mathieu  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale
Joly, Pierre;  Université Claude Bernard - Lyon 1 - UCLB - France
Language :
English
Title :
Neoteny and progenesis as two heterochronic processes involved in paedomorphosis in Triturus alpestris (Amphibia: Caudata)
Publication date :
2000
Journal title :
Proceedings of the Royal Society. Biological Sciences
ISSN :
0962-8452
eISSN :
1471-2954
Publisher :
The Royal Society, United Kingdom
Volume :
267
Issue :
1451
Pages :
1481-1485
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
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