Reference : Metamorphosis rate of paedomorphs in a natural newt population
Scientific congresses and symposiums : Poster
Life sciences : Zoology
http://hdl.handle.net/2268/70789
Metamorphosis rate of paedomorphs in a natural newt population
English
Denoël, Mathieu mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Lena, J. P. [Université Claude Bernard - Lyon 1 - UCLB > > > >]
Joly, Pierre [Université Claude Bernard - Lyon 1 - UCLB > > > >]
2007
Yes
No
International
14th European Congress of Herpetology
19-23 September 2007
Porto
Portugal
[en] Congress
[en] Facultative paedomorphis is a developmental process in which larvae opt for metamorphosis before maturity or reach sexual maturity while retaining larval traits (e.g., gills). Although metamorphosis is not reversible, the paedomorphic state is not a dead end as branchiate adults are able to metamorphose. However, the extent of this process has never been quantified in the wild. Our aim was then to estimate switching rate by carrying out a 3-year monitoring survey of a population of Alpine newts (Triturus alpestris) inhabiting an alpine lake. The data were analysed using a multi-state capture-recapture model. While morph switching did occur in this population, it involved only 12% of the paedomorphs each year (i.e., 17% of recaptured individuals), suggesting that metamorphosis was not favoured in this population during the study period. This rate is lower than in laboratory experiments during which newts from the same population were placed in water drying conditions, but as shown previously paedomorphs can avoid metamorphosis in migrating to permanent water bodies when their pond dries out. These results are in agreement with other studies showing an advantage of a dimorphism in heterogeneous habitats. The ontogenetic pathway of wild Alpine newts is thus characterised by two forks in the developmental pathway. The first occurs during the larval stage, and the second occurs in paedomorphic adults. Such a two-level decision process may allow individuals to cope with environmental uncertainty. This may be particularly adaptive as aquatic conditions can deteriorate over time as shown by yearly changes in body condition of newts
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/70789
http://hdl.handle.net/2268/3137

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
Abstract-2007-1-SEH.pdfThis is the pdf of the published abstract and the cover of the abstract bookPublisher postprint456.36 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.