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Titolo:
Choosy females and indiscriminate males: mate choice in mixed populations of sexual and hybridogenetic water frogs (Rana lessonae, Rana esculenta)
Autore:
Engeler, B; Reyer, HU;
Indirizzi:
Univ Zurich, Inst Zool, CH-8057 Zurich, Switzerland Univ Zurich Zurich Switzerland CH-8057 Zool, CH-8057 Zurich, Switzerland
Titolo Testata:
BEHAVIORAL ECOLOGY
fascicolo: 5, volume: 12, anno: 2001,
pagine: 600 - 606
SICI:
1045-2249(200109/10)12:5<600:CFAIMM>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPERM-DEPENDENT PARTHENOGENESIS; MITOCHONDRIAL-DNA; MATING-BEHAVIOR; BUFO-AMERICANUS; AUSTRALIAN FROG; SELECTION; TOADS; COEXISTENCE; POECILIIDAE; EVOLUTION;
Keywords:
coexistence; fitness; hybridogenesis; male competition; mate choice; population dynamics; reproductive success;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
75
Recensione:
Indirizzi per estratti:
Indirizzo: Reyer, HU Univ Zurich, Inst Zool, Winterthurerstr 190, CH-8057 Zurich, Switzerland Univ Zurich Winterthurerstr 190 Zurich Switzerland CH-8057 land
Citazione:
B. Engeler e H.U. Reyer, "Choosy females and indiscriminate males: mate choice in mixed populations of sexual and hybridogenetic water frogs (Rana lessonae, Rana esculenta)", BEH ECOLOGY, 12(5), 2001, pp. 600-606

Abstract

For several decades, behavioral ecologists have studied the effects of theenvironment on the behavior of individuals; but only fairly recently they have started to ask the reverse question: how do the behavioral strategies of individuals affect the composition and dynamics of populations and communities? Although intuitively obvious, this feedback From individual to higher levels is difficult to demonstrate, except in systems with exceptionallyfast and marked responses of the populations to the behavior of its members. Such a system exists in sperm-dependent species. In European water frogs, for instance, successful reproduction of a hybrid species (R. esculenta, genotype LR) requires mating with one of its parental species (R. lessonae,genotype LL), except in the rare cases where hybrids are triploid. The sexual host LL, however, should avoid matings with the sexual parasite LR, because the resulting LR offspring will eliminate the L genome from their. germ line. In this study we investigate how this conflict is solved. Since water frog hybrids come in both sexes, rather than as females only like in other sperm-dependent systems, we performed the tests with both females and males. One individual was given a choice between two individuals of the opposite sex, one an LL and the other an LR. In both species, females showed thepredicted preference for LL males, whereas males did not discriminate between LL and LR females. On the individual level, we interpret the sex difference in choosiness by the lower costs from mating with the wrong species (LR) and the higher benefits from mating with large individuals in males thanin females. In "normal" species, male preference for large (i.e. more fecund) females is advantageous, but in this system such a choice can result inmating with the larger LR females. With respect to the structure and dynamics of mixed populations, we discuss that the observed female preference isconsistent with the higher mating success of LL males found in nature. Hence, mate female choice is a strong candidate for a mechanism promoting coexistence of the sperm-dependent hybrid and its sexual host. This confirms predictions from previous theoretical models.

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Documento generato il 01/10/20 alle ore 07:41:08