Birds of Indian Subcontinent

Territorial Responses of Boreal Forest Birds to Habitat Gaps

Publication Type:Journal Article
Year of Publication:1997
Authors:Rail, J-F, Darveau, M, Desrochers, A, Huot, J
Journal:The Condor
Date Published:1997
ISBN Number:00105422
Keywords:Acanthopneuste nitida, Catharus, Catharus ustulatus, Dendroica, Dendroica virens, Emberizidae, Hylocichla, Hylocichla ustulata, Junco, Junco hyemalis, Parulidae, Phylloscopus, Phylloscopus nitidus, Regulidae, Regulus, Regulus satrapa, Satrapa, Seicercus, Seicercus nitidus, Setophaga, Setophaga virens, Turdidae, Zonotrichia, Zonotrichia albicollis
Abstract:We used playback trials to determine whether birds will cross treeless gaps to respond to simulated territorial intruders. We evaluated the effect of gap width on responses by five forest bird species. We found that for forest specialists such as the Swainson's Thrush (Catharus ustulatus), Golden-crowned Kinglet (Regulus satrapa), and the Black-throated Green Warbler (Dendroica virens), the probability of crossing gaps decreased sharply with gaps 25-40 m wide. By contrast, control trials showed no significant decrease in their probability of response up to 100 m through continuous stands. Habitat generalists such as the White-throated Sparrow (Zonotrichia albicollis) and the Dark-eyed Junco (Junco hyemalis) were more prone to cross treeless gaps than forest specialists. Playback studies provide a new tool for understanding birds' responses to microscale habitat discontinuities.
Short Title:The Condor
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith