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Fine-scale movement decisions of tropical forest birds in a fragmented landscape

2011; Wiley; Volume: 21; Issue: 3 Linguagem: Inglês

10.1890/09-2090.1

1939-5582

Cameron S. Gillies, Hawthorne L. Beyer, Colleen Cassady St. Clair,

Wildlife-Road Interactions and Conservation

Ecological ApplicationsVolume 21, Issue 3 p. 944-954 Article Fine-scale movement decisions of tropical forest birds in a fragmented landscape Cameron S. Gillies, Cameron S. Gillies Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9 Canada Present address: Tierra Environmental Consulting, 4711 Galena St., Windermere, BC V0B 2L2 Canada. E-mail: [email protected]Search for more papers by this authorHawthorne L. Beyer, Hawthorne L. Beyer Ecology and Evolutionary Biology, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ Scotland, United KingdomSearch for more papers by this authorColleen Cassady St. Clair, Colleen Cassady St. Clair Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9 CanadaSearch for more papers by this author Cameron S. Gillies, Cameron S. Gillies Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9 Canada Present address: Tierra Environmental Consulting, 4711 Galena St., Windermere, BC V0B 2L2 Canada. E-mail: [email protected]Search for more papers by this authorHawthorne L. Beyer, Hawthorne L. Beyer Ecology and Evolutionary Biology, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ Scotland, United KingdomSearch for more papers by this authorColleen Cassady St. Clair, Colleen Cassady St. Clair Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9 CanadaSearch for more papers by this author First published: 01 April 2011 https://doi.org/10.1890/09-2090.1Citations: 44 Corresponding Editor: T. R. Simons. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The persistence of forest-dependent species in fragmented landscapes is fundamentally linked to the movement of individuals among subpopulations. The paths taken by dispersing individuals can be considered a series of steps built from individual route choices. Despite the importance of these fine-scale movement decisions, it has proved difficult to collect such data that reveal how forest birds move in novel landscapes. We collected unprecedented route information about the movement of translocated forest birds from two species in the highly fragmented tropical dry forest of Costa Rica. In this pasture-dominated landscape, forest remains in patches or riparian corridors, with lesser amounts of living fencerows and individual trees or “stepping stones.” We used step selection functions to quantify how route choice was influenced by these habitat elements. We found that the amount of risk these birds were willing to take by crossing open habitat was context dependent. The forest-specialist Barred Antshrike (Thamnophilus doliatus) exhibited stronger selection for forested routes when moving in novel landscapes distant from its territory relative to locations closer to its territory. It also selected forested routes when its step originated in forest habitat. It preferred steps ending in stepping stones when the available routes had little forest cover, but avoided them when routes had greater forest cover. The forest-generalist Rufous-naped Wren (Campylorhynchus rufinucha) preferred steps that contained more pasture, but only when starting from non-forest habitats. Our results showed that forested corridors (i.e., riparian corridors) best facilitated the movement of a sensitive forest specialist through this fragmented landscape. They also suggested that stepping stones can be important in highly fragmented forests with little remaining forest cover. We expect that naturally dispersing birds and species with greater forest dependence would exhibit even stronger selection for forested routes than did the birds in our experiments. Literature Cited Akaike, H. 1973. Information theory as an extension of the maximum likelihood principle. Pages 267– 281. in B. N. Petrov and F. Csaki . editors. 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