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Titolo:
The effects of two acanthocephalan parasites, Pomphorhynchus laevis and Polymorphus minutus, on pairing success in male Gammarus pulex (Crustacea : Amphipoda)
Autore:
Bollache, L; Gambade, G; Cezilly, F;
Indirizzi:
Univ Bourgogne, CNRS, UMR 5561 Biogeosci, Lab Ecol Evolut, F-21000 Dijon, France Univ Bourgogne Dijon France F-21000 b Ecol Evolut, F-21000 Dijon, France
Titolo Testata:
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
fascicolo: 4, volume: 49, anno: 2001,
pagine: 296 - 303
SICI:
0340-5443(200103)49:4<296:TEOTAP>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEROTONIN-LIKE IMMUNOREACTIVITY; MATE CHOICE; PARADOXUS ACANTHOCEPHALA; OLFACTORY INTERNEURONS; INSENSIBILIS AMPHIPODA; INTERSEXUAL CONFLICT; PRECOPULA DURATION; AMOROUS GAMMARUS; SEXUAL SELECTION; BEHAVIOR;
Keywords:
male competition; reproductive success;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Cezilly, F Univ Bourgogne, CNRS, UMR 5561 Biogeosci, Lab Ecol Evolut, 6 Bld Gabriel, F-21000 Dijon, France Univ Bourgogne 6 Bld Gabriel Dijon FranceF-21000 ijon, France
Citazione:
L. Bollache et al., "The effects of two acanthocephalan parasites, Pomphorhynchus laevis and Polymorphus minutus, on pairing success in male Gammarus pulex (Crustacea : Amphipoda)", BEHAV ECO S, 49(4), 2001, pp. 296-303

Abstract

Parasites can decrease male mating success in host species in various ways, in particular by affecting male competitive ability for access to females. However, male-male competition can take different forms (i.e. interference vs exploitation competition) and which type of competition is most affected by parasites is not always clear. We investigated the influence of two acanthocephalan parasites Pomphorhynchus laevis and Polymorphus minutus on the pairing success of their intermediate host, Gammarus pulex, using field-based studies and complementary laboratory-based studies. We first studied male pairing success in the field using four large samples of paired and unpaired individuals collected at different dates. In three of the samples, the effects of size and parasite infection were significant, whereas for onesample only male size had a significant effect. There was no difference insize distributions between infected and uninfected gammarids. Large males were paired more often than smaller males, and uninfected males were pairedmore frequently than infected males, the pairing success of P. minutus-infected males being more severely affected than that of P. laevis-infected males. We then experimentally tested the ability to enter into precopula witha receptive female in the presence or absence of competitors. In competitive situations, the pairing success of P. laevis- and P. minutus-infected males was significantly lower than that of uninfected males, with pairing success being more affected in P. laevis-infected than in P. minutus-infected males. In the absence of competition, males infected with P. laevis were significantly less likely to enter into precopula compared with uninfected males and P. minutus-infected males, whereas there was no difference between uninfected and P. minutus-infected males in their inclination to pair with a receptive female. However, for both parasites, latency time to pair formation was significantly shorter for uninfected than for infected males. In athird experiment, we tested for a potential effect of vertical segregationon the pairing success of infected and uninfected males, but found no evidence for it. We conclude that infected males may be less competitive than uninfected males in competition by exploitation between males for females.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/20 alle ore 01:27:44