Extraterritorial Movements of a Forest Songbird in a Fragmented Landscape
From Pubwiki
[edit] Author(s)
- Norris, D. R.
- Stutchbury, B. J. M.
[edit] Journal
Conservation Biology 15.3 (2001): 729-36.
[edit] Keywords
male hooded warblers habitat fragmentation agricultural landscape natal dispersal breeding bird corridors success conservation passerines selection
[edit] Abstract
Forest isolation resulting from fragmentation is thought to impede the movement of forest songbirds. Because of the difficulty of tracking birds continuously however, few data exist documenting the influence of isolation and landscape features on avian movements. During the breeding season male Hooded Warblers (Wilsonia citrine) leave their small (<2.5 ha), isolated forest patches to travel between forest fragments. We documented a total of 106 forays (n = 20 males) and found that individuals traveled up to 2.5 km away from their resident forest patch, primarily to solicit covert extra-pair copulations Forays occurred despite the absence of forested corridors connecting fragments; even when corridors were present, males most often chose to fly directly across open fields. Resident patch size and distance to forests visited were not correlated with the frequency of forays. The maximum distance males flew over open fields did not exceed 465 m and longer distances likely inhibit males from traveling outside their woodlots. If territorial establishment depends on the availability of extra-pair partners, then higher degrees of isolation between forests could explain why some species avoid settling in extremely fragmented landscapes. Conservation efforts should limit isolation between forest stands, thereby preserving the ability of animals to move within fragmented landscapes during the breeding season.
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