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Titolo:
EFFECTS OF RAIN-FOREST DISTURBANCE AND FRAGMENTATION - COMPARATIVE CHANGES OF THE RAPTOR COMMUNITY ALONG NATURAL AND HUMAN-MADE GRADIENTS IN FRENCH-GUIANA
Autore:
JULLIEN M; THIOLLAY JM;
Indirizzi:
ECOLE NORMALE SUPER,CNRS,URA 258,ECOL LAB,46 RUE ULM F-75230 PARIS 05FRANCE ECOLE NORMALE SUPER,CNRS,URA 258,ECOL LAB F-75230 PARIS 05 FRANCE
Titolo Testata:
Journal of biogeography
fascicolo: 1, volume: 23, anno: 1996,
pagine: 7 - 25
SICI:
0305-0270(1996)23:1<7:EORDAF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
CANONICAL CORRESPONDENCE-ANALYSIS; BIRD COMMUNITIES; VEGETATION STRUCTURE; ENVIRONMENT RELATIONSHIPS; HABITAT HETEROGENEITY; TROPICAL FOREST; DIVERSITY; AREA; CONSERVATION; TEMPERATE;
Keywords:
RAIN FOREST; BIRDS; FALCONIFORMS; HABITAT USE; DEFORESTATION; CONSERVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
71
Recensione:
Indirizzi per estratti:
Citazione:
M. Jullien e J.M. Thiollay, "EFFECTS OF RAIN-FOREST DISTURBANCE AND FRAGMENTATION - COMPARATIVE CHANGES OF THE RAPTOR COMMUNITY ALONG NATURAL AND HUMAN-MADE GRADIENTS IN FRENCH-GUIANA", Journal of biogeography, 23(1), 1996, pp. 7-25

Abstract

A density index of every diurnal raptor species (Falconiformes) was obtained on 101 400 ha sample plots distributed among eight natural habitats and five manmade habitats arranged along gradients of increasingforest degradation and fragmentation. The most significant structuralparameter affecting species distribution was the tall canopy forest cover. Species richness, diversity and density all decreased with this mature forest cover index. Individual species and overall community densities decreased along the deforestation gradient but the species richness was partly maintained by species turnover. Six groups of specieswere identified according to their natural habitat preferences. Theirdistribution along the deforestation gradient was correlated with their natural habitat selection pattern. Thus the community composition of each vegetation or landscape type was predictable. Fifty-six percentof the regional assemblage of species had their optimal density in the primary forest. A third of them were interior forest species highly sensitive to forest disturbance and opening. The other two-thirds wereupper canopy, gap or edge species more tolerant to forest fragmentation. The last twenty-one species were associated with various coastal habitats, from dense forest patches to mangrove and savanna. Again, onethird of them were strictly restricted to their specialized habitats while the last two-thirds colonized human-altered habitats and progressively replaced primary forest species with increasing deforestation. The maintenance of large areas of every natural habitat was essential for the conservation of (1) the whole population of a third of the total raptor diversity and (2) optimal and presumably potential source populations of most other species surviving in human-modified habitats.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 19:47:47