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Titolo:
The genetic mating system and tests for cuckoldry in a pipefish species inwhich males fertilize eggs and brood offspring externally
Autore:
McCoy, EE; Jones, AG; Avise, JC;
Indirizzi:
Univ Georgia, Dept Genet, Athens, GA 30602 USA Univ Georgia Athens GA USA30602 eorgia, Dept Genet, Athens, GA 30602 USA
Titolo Testata:
MOLECULAR ECOLOGY
fascicolo: 7, volume: 10, anno: 2001,
pagine: 1793 - 1800
SICI:
0962-1083(200107)10:7<1793:TGMSAT>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEX-ROLE REVERSAL; PARENTAGE ANALYSIS; MATE CHOICE; MICROSATELLITE; EVOLUTION; SELECTION; MARKERS; SYNGNATHIDAE; ECOLOGY; SUNFISH;
Keywords:
microsatellites; maternity; Nerophis; paternity; Syngnathidae;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: McCoy, EE Univ Georgia, Dept Genet, Athens, GA 30602 USA Univ Georgia Athens GA USA 30602 pt Genet, Athens, GA 30602 USA
Citazione:
E.E. McCoy et al., "The genetic mating system and tests for cuckoldry in a pipefish species inwhich males fertilize eggs and brood offspring externally", MOL ECOL, 10(7), 2001, pp. 1793-1800

Abstract

Highly variable microsatellite loci were used to study the mating system of Nerophis ophidion, a species of pipefish in which pregnant males carry embryos on the outside of their body rather than in an enclosed brood pouch. Despite this mode of external fertilization and brooding, otherwise rare inthe family Syngnathidae, the genotypes of all embryos proved to be consistent with paternity by the tending male, thus indicating that cuckoldry by sneaker males is rare or nonexistent in this species. N. ophidion is a phylogenetic outlier within the Syngnathidae and its reproductive morphology is thought to be close to the presumed ancestral condition for pipefishes and seahorses. Thus, our genetic results suggest that the evolutionary elaboration of the enclosed brood pouch elsewhere in the family was probably not inresponse to selection pressures on pregnant males to avoid fertilization thievery. With regard to maternity assignments, our genotypic data are consistent with behavioural observations indicating that females sometimes mate with more than one male during a breeding episode, and that each male carries eggs from a single female. Thus, the polyandrous genetic mating system in this species parallels the social mating system, and both are consistent with a more intense sexual selection operating on females, and the elaboration of secondary sexual characters in that gender.

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Documento generato il 31/03/20 alle ore 10:10:44