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Seasonal Movement and Home Range of the Mariana Common Moorhen

The Condor

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Abstract

Adult Mariana Common Moorhens (Gallinula chloropus guami) were radio-marked on Guam (n = 25) and Saipan (n = 18) to determine home range, inter- and intraseasonal space use, and movement patterns among the Mariana Islands of Guam, Saipan, Tinian, and Rota. Birds were tracked throughout the dry and wet seasons in 2000 and 2001. During the dry season, no interisland movements were detected and most birds remained at a single wetland. However, some radio-marked adults on Guam (48%) and Saipan (11%) dispersed from their capture site to other wetland sites. Inter-and intraisland movements increased during the wet season. Interisland movement from Saipan to Tinian occurred at the onset of the wet season, although no birds were observed moving off Guam. Radio-marked adults on Guam (71%) and Saipan (70%) dispersed from their capture site to other wetlands. On Guam, moorhens moved farther in the wet season than the dry season. During the wet season frequency of movement among sites was inversely proportional to the average distance between wetlands. Guam moorhens used rivers more often during the wet season. Among nine dispersing adult moorhens captured during the wet season on Fena Reservoir, Guam, 67% returned to Fena Reservoir during the 2001 dry season. Home-range estimates on Guam averaged 3.1 A? 4.8 ha (SD) and did not differ significantly between sexes or seasons. However, during the dry season, females exhibited significantly smaller mean core areas than males.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seasonal Movement and Home Range of the Mariana Common Moorhen
Series title:
The Condor
Volume
106
Year Published:
2004
Language:
English
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
p. 652-663
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
652
Last page:
663
Number of Pages:
12