titoli, abstracts, parole chiave >>>
Female-female conflict in the harem of a snail cichlid (Lamprologus ocellatus): behavioural interactions and fitness consequences

Brandtmann, Gesine and Scandura, Massimo and Trillmich, Fritz (1999) Female-female conflict in the harem of a snail cichlid (Lamprologus ocellatus): behavioural interactions and fitness consequences. Behaviour, Vol. 136 (9), p. 1123-1144. ISSN 1568-539X. Article.

Full text not available from this repository.

DOI: 10.1163/156853999501793


Female intra-sexual competition plays an important role in the settlement process during pair or harem formation and in established harems of Lamprologus ocellatus , a small snail shell inhabiting cichlid from Lake Tanganyika. Larger females settle first and this could partly be due to male preference for larger females as shown in simultaneous choice tests but is also due to dominance of the larger female. Smaller females were unable to settle close to a larger one. Even when snail shells were not limiting the smaller was either unable to settle or had to settle at a considerable distance. This effect was independent of prior residence. Intense female-female aggression suggests that close settlement is disadvantageous to females. Genetic analyses of maternity using microsatellite length polymorphism at five loci showed a reproductive skew between females in a harem. Additionally, it proved brood mixing in aquaria as well as in the field. Brood mixing can be detrimental to female breeding success through interbrood cannibalism if size difference of juveniles amounts to 5 mm. Territoriality of juveniles, shown even between same-sized siblings, may cause indirect mortality through earlier dispersal of young. Females rejected experimentally added larger juveniles but accepted young smaller than their own fry. Acceptance of smaller juveniles could be advantageous through a dilution of predator attacks but it also appears to induce costs since females with young at the shell do not rear another brood. Large median distances of 91 cm maintained aggressively between breeding females in the field may serve to minimize the adverse effects of breeding in a harem.

Item Type:Article
ID Code:3653
Uncontrolled Keywords:Female-female competition, male choice, resource defence, microsatellite, sibling cannibalism, Lamprologus ocellatus, cichlid
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Zoologia e genetica evoluzionistica
Deposited On:30 Mar 2010 10:46

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page