Variability of life history traits in fragmented populations: breeding strategies in Parsley frog, Pelodytes punctatus (Anuran)

Détails

Ressource 1Télécharger: BIB_1AAF696ACE86.P001.pdf (9907.56 [Ko])
Etat: Public
Version: Après imprimatur
ID Serval
serval:BIB_1AAF696ACE86
Type
Thèse: thèse de doctorat.
Collection
Publications
Titre
Variability of life history traits in fragmented populations: breeding strategies in Parsley frog, Pelodytes punctatus (Anuran)
Auteur(s)
Jourdan Hélène
Directeur(s)
David Patrice
Codirecteur(s)
Pierre-André Crochet
Détails de l'institution
Université Montpellier 2
Statut éditorial
Acceptée
Date de publication
09/2010
Langue
anglais
Résumé
Phenotypic plasticity tends to increase in temporally and spatially variable environments. This thesis deals with the variability of life-history traits in fragmented populations. In Mediterranean regions, Parsley frog, Pelodytes punctatus, breeds both in spring and in autumn, in response to temporal variations of its environment. I studied the origin and evolutionary consequences of its breeding strategies.
Both breedin periods producs offspring (much more in autumn though) and spring tadpoles suffer from intraspecific competition with older autumn tadpoles. Autumn laid juveniles are buigger and emerged sooner from the ponds. These developmental differences are not due to genetic differences betwenn seasonal populations. They are explained by phenotypic plasticity in response to drastically different conditions. Even if it seems more favourable to breed in autumn, both strategies are maintained either by bet-hedging or pure opportunism.
Besides, fragmentation, which increases with global changes, tends to reduce population effective size and increase genetic heterogeneity within populations. However, no inbreeding was found in the studied populations bu a high family structure induced allele/fitness correaltions.
Together these results enlighten the variability of breeding strategies and larval traits in Parsley frog and indicate a high phenotypic plasticity in response to environmental variations.
Mots-clé
life-history traits, breeding phenology, larval development, phenotypic plasticity, fragmentation, genotype/phenotype correlation
Création de la notice
16/09/2011 12:55
Dernière modification de la notice
20/08/2019 12:51
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