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Titolo:
Ecologically determined natal philopatry within a colony of great cormorants
Autore:
Schjorring, S;
Indirizzi:
Aarhus Univ, Inst Biol Sci, Dept Zool, DK-8000 Aarhus C, Denmark Aarhus Univ Aarhus Denmark C l Sci, Dept Zool, DK-8000 Aarhus C, Denmark
Titolo Testata:
BEHAVIORAL ECOLOGY
fascicolo: 3, volume: 12, anno: 2001,
pagine: 287 - 294
SICI:
1045-2249(200105/06)12:3<287:EDNPWA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
INBREEDING AVOIDANCE; TERRITORY QUALITY; BREEDING SUCCESS; REPRODUCTIVE SUCCESS; POPULATION-DYNAMICS; KIN RECOGNITION; CLIFF SWALLOWS; DISPERSAL; BIRDS; CONSEQUENCES;
Keywords:
great comorants; habitat selection; kin selection; natal dispersal distance; Phalacrocorax carbo sinensis; philopatry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Schjorring, S Max Planck Inst Limnol, Dept Evolutionary Ecol, August Thienemann Str 2, D-24306 Plon, Germany Max Planck Inst Limnol August ThienemannStr 2 Plon Germany D-24306
Citazione:
S. Schjorring, "Ecologically determined natal philopatry within a colony of great cormorants", BEH ECOLOGY, 12(3), 2001, pp. 287-294

Abstract

Dispersal patterns of individuals within populations have implications forthe social and genetic structure of local populations. Knowing what factors determine individual dispersal behavior is essential for predicting how the population structure will be influenced by environmental and demographicchanges. In this study, I investigated whether the settling pattern of individuals breeding for the first time a colony of great cormorants was determined by ecological or genetic factors. Furthermore, I examined the possible effects of age and gender. First-time breeders that came back to breed within their natal colony showed strong philopatry toward their natal breeding sites. Because of the simultaneous strong fidelity of breeders toward their former breeding sites, this caused kin to cluster to some extent around the natal site. However, genetic factors (attraction to close kin) are lesslikely to explain natal philopatry than ecological ones (attraction to thenatal site itself). Younger first-time breeders were more philopatric thanolder ones, in accordance with a decrease in the predictability of the quality of breeding sites with increasing time lags. Furthermore, males dispersed farther from the natal breeding site than females. This result is contrary to what is generally expected for a breeding system where the male is dependent on a breeding territory for mate acquisition I suggest that this sex difference could arise because first-time breeding males are constrainedfrom settling in the natal site by interference competition with older males or because males are better informed about alternative breeding sites ofhigh quality within the colony.

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Documento generato il 29/09/20 alle ore 21:36:56