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Population Variability and Extinction in the Avifauna of a Tropical Land Bridge Island

Population Variability and Extinction in the Avifauna of a Tropical Land Bridge Island Ecology, 63(6), 1982, pp. 1975-1978 22 000-ha tract of lowland forest on the mainland ad­ © 1982 by the Ecological Society of America jacent to BCI. At its nearest point, BCI is =200 m from a peninsular extension of that forest, although less-disturbed forest is not so close. As many as 50-- 60 species of forest birds are missing from BCI (Karr POPULATION VARIABILITY AND 1982), well above earlier conclusions that 15-18 forest EXTINCTION IN THE AVIFAUNA OF species are extinct on BCI (Terborgh 1974, Willis 1974, A TROPICAL LAND BRIDGE ISLAND Wilson and Willis 1975, Willis and Eisenmann 1979). The approach used in earlier estimates of avian ex­ James R. Karr tinctions on BCI led to underestimation of extinction rates. Further, the high extinction rate seems to be Newly created oceanic islands slowly accumulate due to the restricted habitat mosaic of BCI relative to species. In contrast, habitat islands created by rising that found on a similar-sized mainland area. Under­ water level or by human reduction of the area of a growth and ground species and species associated with habitat (for example, by deforestation) support a full foothill forest are especially prone to extinction (Karr complement of local http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecology Wiley

Population Variability and Extinction in the Avifauna of a Tropical Land Bridge Island

Karr, James R.
Ecology , Volume 63 (6) – Dec 1, 1982
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References (6)

Publisher
Wiley
Copyright
© Society for Community Research and Action
ISSN
0012-9658
eISSN
1939-9170
DOI
10.2307/1940137
Publisher site
See Article on Publisher Site

Abstract

Ecology, 63(6), 1982, pp. 1975-1978 22 000-ha tract of lowland forest on the mainland ad­ © 1982 by the Ecological Society of America jacent to BCI. At its nearest point, BCI is =200 m from a peninsular extension of that forest, although less-disturbed forest is not so close. As many as 50-- 60 species of forest birds are missing from BCI (Karr POPULATION VARIABILITY AND 1982), well above earlier conclusions that 15-18 forest EXTINCTION IN THE AVIFAUNA OF species are extinct on BCI (Terborgh 1974, Willis 1974, A TROPICAL LAND BRIDGE ISLAND Wilson and Willis 1975, Willis and Eisenmann 1979). The approach used in earlier estimates of avian ex­ James R. Karr tinctions on BCI led to underestimation of extinction rates. Further, the high extinction rate seems to be Newly created oceanic islands slowly accumulate due to the restricted habitat mosaic of BCI relative to species. In contrast, habitat islands created by rising that found on a similar-sized mainland area. Under­ water level or by human reduction of the area of a growth and ground species and species associated with habitat (for example, by deforestation) support a full foothill forest are especially prone to extinction (Karr complement of local

Journal

Ecology – Wiley

Published: Dec 1, 1982

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