Effect of rival males on the courtship of paedomorphic and metamorphic Triturus alpestris (Amphibia : Salamandridae)

Sexual behaviour; Alternative mating tactic; Competition; Ichthyosaura alpestris alpestris; Alpine newt; Lac de la Cabane; Courtship behaviour; Sexual interference; Mating; Behavior; Heterochrony; Secundary sexual trait; Facultative paedomorphosis; Polymorphism; Fitness; Mesotriton alpestris; Triturus alpestris; Triton alpestre; Comportement sexuel; Pédomorphose; Tactique

Abstract :

[en] Current theories on the alternative mating tactics suppose that individuals may opt for particular behavioral patterns depending of their morphological status. Facultative paedomorphosis in newts and salamanders is a suitable process to explore this question because it implies the coexistence of two different morphological morphs differing by the presence of gills and epigamic traits. The aim of this study was to find out whether paedomorphs and metamorphs use similar tactics to attract mates in the presence of a rival and whether there are differences in sexual activity and success between alternative morphs. Sexual interactions in triadic encounters were staged and analyzed in a standardized experimental design. The two kinds of males did not differ in terms of sexual activity, spermatophore deposition or female responsiveness. Both rival paedomorphic and metamorphic males exhibited sexual interference, but in most encounters, intruders just disturbed the courting pair. Sperm transfer success was lower in triadic encounters than in dyadic encounters. These results illustrate that intermorph breeding also occurs in the presence of competitors but that the success rate of the newts is considerably decreased in such competitive situations. Moreover, newts do not use alternative reproductive tactics depending on their status (i.e., paedomorph or metamorph).

Disciplines :

Animal psychology, ethology & psychobiology
Zoology

Author, co-author :

Denoël, Mathieu ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale

Language :

English

Title :

Effect of rival males on the courtship of paedomorphic and metamorphic Triturus alpestris (Amphibia : Salamandridae)

Publication date :

2003

Journal title :

Copeia

ISSN :

0045-8511

Publisher :

Amer Soc Ichthyologists Herpetologists, Charleston, United States - South Carolina

Volume :

2003

Issue :

Pages :

618-623

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://dx.doi.org/10.1643/CE-02-224R1

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Available on ORBi :

since 21 December 2008

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