Lake selection by Madagascar Fish-Eagles

Citation
J. Berkelman et al., Lake selection by Madagascar Fish-Eagles, AUK, 116(4), 1999, pp. 976-983
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
AUK
ISSN journal
0004-8038 → ACNP
Volume
116
Issue
4
Year of publication
1999
Pages
976 - 983
Database
ISI
SICI code
0004-8038(199910)116:4<976:LSBMF>2.0.ZU;2-Y
Abstract
We investigated fish abundance and habitat characteristics at 32 lakes occu pied by Madagascar Fish-Eagles (Haliaeetus vociferoides) and 32 randomly se lected unoccupied lakes between Morondava and Boriziny in western Madagasca r from May to November 1995. We measured lake and shoreline habitat charact eristics and used gill nets to sample fish populations. Compared with unocc upied lakes, lakes occupied by fish-eagles were deeper and clearer, had mor e shoreline perch trees, and yielded gill-net catches with more fish, a hig her total fish mass, and more fish species. A logistic regression model wit h number of shoreline perch trees and number of fish species caught in gill nets as independent variables correctly classified fish-eagle use for 76.6 % of the lakes in the study. A model with number of shoreline perch trees a lone was 71.9% accurate, suggesting that perch-tree availability is the mos t important factor limiting populations of Madagascar Fish-Eagles. The resu lts indicate that Madagascar Fish-Eagles require bodies of water with large shoreline trees and ample populations of fish.