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Titolo:
The effects of habitat fragmentation on persistence of source-sink metapopulations in systems with predators and prey or apparent competitors
Autore:
Namba, T; Umemoto, A; Minami, E;
Indirizzi:
Osaka Womens Univ, Dept Nat Sci, Sakai, Osaka 5900035, Japan Osaka Womens Univ Sakai Osaka Japan 5900035 , Sakai, Osaka 5900035, Japan
Titolo Testata:
THEORETICAL POPULATION BIOLOGY
fascicolo: 1, volume: 56, anno: 1999,
pagine: 123 - 137
SICI:
0040-5809(199908)56:1<123:TEOHFO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION-DYNAMICS; ECOLOGICAL COMMUNITIES; SPATIAL HETEROGENEITY; PATCH CONNECTIVITY; MIGRATORY BIRDS; EXTINCTION; MODELS; CONSEQUENCES; ENVIRONMENTS; COEXISTENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
75
Recensione:
Indirizzi per estratti:
Indirizzo: Namba, T Osaka Womens Univ, Dept Environm Sci, Daison Cho 2-1, Sakai, Osaka 5900035, Japan Osaka Womens Univ Daison Cho 2-1 Sakai Osaka Japan 5900035 Japan
Citazione:
T. Namba et al., "The effects of habitat fragmentation on persistence of source-sink metapopulations in systems with predators and prey or apparent competitors", THEOR POP B, 56(1), 1999, pp. 123-137

Abstract

We consider systems with one predator and one prey, or a common predator and two prey species (apparent competitors) in source and sink habitats. In both models, the predator species is vulnerable to extinction, if productivity in the source is insufficient to rescue demographically deficient sink populations. Conversely, in the model with two prey species, if the source is too rich, one of the prey species may be driven extinct by apparent competition, since the predator can maintain a large population because of the alternative prey. Increasing the rate of predator movement from the source population has opposite effects on prey and predator persistence. High emigration rate exposes the predator population to danger of extinction, reducing the number of individuals that breed and produce offspring in the sourcehabitat. This may promote coexistence of prey by relaxing predation pressure and apparent competition between the two prey species. The number of sinks and spatial arrangement of patches, or connectivity between patches, also influence persistence of the species. More sinks favor the prey and fewersinks are advantageous to the predator. A linear pattern with the source at one end is profitable for the predator, and a centrifugal pattern in which the source is surrounded by sinks is advantageous to the prey. When the dispersal rate is low, effects of the spatial structure may exceed those of the number of sinks. In brief, productivity in patches and patterns of connectivity between patches differentially influence persistence of populations in different trophic levels. (C) 1999 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 11:23:47