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Titolo:
MULTISPECIES TERRITORIALITY AND DYNAMIC OF NEOTROPICAL FOREST UNDERSTOREY BIRD FLOCKS
Autore:
JULLIEN M; THIOLLAY JM;
Indirizzi:
ENS,INST ECOL,ECOL LAB,CNRS URA 258,46 RUE ULM F-75230 PARIS 05 FRANCE UNIV MONTANA,US NATL BIOL SERV,MONTANA COOPERAT WILDLIFE RES UNIT MISSOULA MT 59812
Titolo Testata:
Journal of Animal Ecology
fascicolo: 2, volume: 67, anno: 1998,
pagine: 227 - 252
SICI:
0021-8790(1998)67:2<227:MTADON>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAIN-FOREST; ORGANIZATION; CHICKADEES; COMMUNITY; SURVIVAL; DENSITY;
Keywords:
FOREST BIRDS; MIXED FLOCKS; NEOTROPICS; STABLE TERRITORIALITY; SURVIVAL RATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
M. Jullien e J.M. Thiollay, "MULTISPECIES TERRITORIALITY AND DYNAMIC OF NEOTROPICAL FOREST UNDERSTOREY BIRD FLOCKS", Journal of Animal Ecology, 67(2), 1998, pp. 227-252

Abstract

1, Eleven contiguous mixed-species bird flocks, with colour-banded individuals, were monitored continuously during 3 years in a 137-ha study area of primary rainforest in French Guiana. 2, Flock members were divided into six categories according to their flocking propensity and occurrence: 10 core or permanent species and 56 regular, occasional orincidental species. Each core species was represented by a single breeding pair with their fledglings and extra 'floaters' (unmated subadults and adults). 3, Flock home ranges overlapped slightly, but were communally defended by all core species in areas of overlap. Their size varied from 3.2 to 14.3 ha and was inversely correlated with vegetationdensity, but not flock size or species composition. 4, Flock number, size and composition, as well as boundaries were highly stable betweenseasons and years. Each flock had a single permanent gathering site and bathing site in late afternoon, the latter sometimes shared by 2-3 flocks.5, Core species produced 0.18-0.73 fledglings per pair per year, which stayed in their natal flock for 200 to over 421 days. Then, these individuals usually moved between two and six different flocks, sometimes for up to 3 years, before finding a mate and a flock where they could settle and breed. Once breeding, they probably remained for life in the same flock. The mean annual survival rate was at least 0.75,6, This highly evolved and stable organization, associated with a lowbreeding success and high survival rate was a critical factor maintaining low species density, delayed reproduction and a proportion of floating individuals buffering population fluctuations. 7, These social groups with their multi-species territoriality and co-evolved roles of flock members were similar to those described elsewhere in South America. They seem to be a general phenomenon in neotropical lowland rainforests.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 11:23:36