Title: Edge Effects and Ecological Traps: Effects on Shrubland Birds in Missouri
Author: Woodward, April A.; Fink, Alix D.; Thompson III, Frank R.;
Source: Journal of Wildlife Management. Vol. 65 no. 4.:p. 668-675. (2001)
Publication Series: Scientific Journal (JRNL)
Description: The effect of habitat edge on avian nesting success has been the focus of considerable debate. We studied relationships between habitat edges, locations of nests, and predation. We tested the ecological trap hypothesis for 5 shrubland bird species in the Missouri Ozarks. We compared habitat selection and daily nest predation rates among 3 distance-to-edge categories. Edge effects were species specific. Indigo bunting (Passerina cyanea) and northern cardinal (Cardinalis cardinalis) preferred nest sites that were close (Icteria virens)and prairie warbler (Dendroica discolor) preferred nest sites >20m from the edge. Field sparrow (Spizella pusilla) used habitat in proportion to availability. Daily nest predation varied by as much as 200-300% among distance-to-edge categories but did not decrease monotonically with distance from edge. The nest predation models without distance-to-edge categories were ranked the best models based on Akaike's Information Criterion; however, Akaike weights indicated some support for alternative models with distance-to-edge categories. Edges did not act as ecological traps for shrubland birds in this study because habitat preference was not positively correlated with nest predation across the 3 distance-to-edge categories. Researchers and land managers should not assume that shrubland birds respond to edges in the same way that forest species respond to edges. Furthermore, species with similar nesting ecology do not necessarily have similar nest-site preferences or nest predation rates in relation to distance to habitat edges.
Keywords: Cardinalis cardinalis, Dendroica discolor, ecological traps, edge effects, field sparrow, Icteria virens, indigo bunting, Missouri, nest predation, northern cardinal, Passerina cyanea, prairie warbler, Spizella pusilla, yellow-breasted chat
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
XML: View XML
Woodward, April A.; Fink, Alix D.; Thompson III, Frank R. 2001. Edge Effects and Ecological Traps: Effects on Shrubland Birds in Missouri. Journal of Wildlife Management. Vol. 65 no. 4.:p. 668-675. (2001)
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility