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• W2312675285 abstract "Foraging success is the first indicator of food availability which in turn is a major determinant of clutch size, timing and output of reproduction as well as habitat selection, density and survival. Yet it has been rarely investigated among insectivorous birds and never along a latitudinal gradient. To allow a meaningful comparison between a tropical and a temperate guild of small foliage gleaners, the data were recorded in similar conditions and restricted to adult birds actively foraging, in the understory of primary rain forest (French Guiana) and old stands of broad leaved forest (France) during the breeding season. The mean attack rate of tropical species is 4 to 6 times lower than that of their temperate equivalents. The differences are highly significant, consistent over every species, and cannot be attributed to the birds' body size or prey size. The temperate species are more specialized on caterpillars and their foraging success has a lower variance than that of tropical species, suggesting that food resources may be on average higher, richer and more evenly distributed in temperate forests. Foraging speed is significantly higher in temperate than in tropical species and is correlated with attack rate and body size only among the latter. There are no consistent relationships between attack rate and foraging height, capture techniques or substrates used. Tropical species make a greater use of dead leaves and epiphytes than do temperate ones, as well as of the most expensive capture modes (probing, striking, sallying). They also take more prey under the leaf surface and have a larger foraging niche breadth than their temperate counterparts. Contrary to the widely assumed superabundance and stability of food resources in the tropics, it is suggested that a reduced prey availability (density, detectability, distribution, seasonality) may be a major cause of the lower foraging success of rain forest birds. Accordingly this constraint is likely to limit their reproductive rate and would in part explain their very low clutch size." @default.
• W2312675285 created "2016-06-24" @default.
• W2312675285 creator A5077277171 @default.
• W2312675285 date "1988-07-01" @default.
• W2312675285 modified "2023-10-14" @default.
• W2312675285 title "Comparative Foraging Success of Insectivorous Birds in Tropical and Temperate Forests: Ecological Implications" @default.
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• W2312675285 doi "https://doi.org/10.2307/3565658" @default.
• W2312675285 hasPublicationYear "1988" @default.
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