科研之友
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摘要
Understanding the basis of habitat choices has important implications in the formulation of practical conservation or management policies. Our objectives were: 1) to determine how Slender-billed Parakeets (Enicognathus leptorhynchus) used a fragmented agricultural landscape of southern Chile in terms of landscape cover and scattered tree elements, 2) to examine seasonal variations, and 3) to provide conservation recommendations to landowners and managers interested in conserving the species and the habitats it uses. We estimated parakeet abundances and landscape components by sampling 30 36-km(2) sites across a 50 by 80 km region, centered at Osorno. Landscape components were used in a multiple linear regression to detect associations between these elements and Slender-billed Parakeet abundances. The results obtained revealed the ability of the vulnerable Slender-billed Parakeet to utilize a mosaic landscape. Parakeets used the landscape differently according to seasons. Associations between parakeet abundances and landscape elements during the non-breeding season were not detected. However, large numbers of scattered trees appeared to be important to support larger parakeet abundances during the breeding season. Mature trees, available in the landscape only as scattered trees, benefit Slender-billed Parakeets as nesting and feeding places - the two most important determinants of their presence. Scattered trees can also benefit the species by facilitating movement across agricultural landscapes. The persistence of the Slender-billed Parakeet in this landscape is intrinsically linked to the conservation and perpetuation of any remaining portion of original old-growth forest, especially the scattered mature trees. Many alternatives and recommendations from this study may have applicability to similar landscapes throughout the world. Accepted 26 May 2012.
- 出版日期2012
