Title: Foray search: an effective systematic dispersal strategy in fragmented landscapes
Author: Conradt, L.; Zollner, P.A.; Roper, T.J.; Thomas, C.D.;
Source: The American Naturalist, vol. 161, no. 6 905-915 June 2003
Publication Series: Scientific Journal (JRNL)
Description: In the absence of evidence to the contrary, population models generally assume that the dispersal trajectories of animals are random, but systematic dispersal could be more efficient at detecting new habitat and may therefore constitute a more realistic assumption. Here, we investigate, by means of simulations, the properties of a potentially widespread systematic dispersal strategy termed ``foray search.`` Foray search was more efficient in detecting suitable habitat than was random dispersal in most landscapes and was less subject to energetic constraints. However, it also resulted in considerably shorter net dispersed distances and higher mortality per net dispersed distance than did random dispersal, and it would therefore be likely to lead to lower dispersal rates toward the margins of population networks. Consequently, the use of foray search by dispersers could crucially affect the extinction-colonization balance of metapopulations and the evolution of dispersal rates. We conclude that population models need to take the dispersal trajectories of individuals into account in order to make reliable predictions.
Keywords: Colonization dynamics, dispersal behavior, dispersal patterns, habitat fragmentation, metapopulation ecology
- 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
Conradt, L.; Zollner, P.A.; Roper, T.J.; Thomas, C.D. 2003. Foray search: an effective systematic dispersal strategy in fragmented landscapes. The American Naturalist, vol. 161, no. 6 905-915 June 2003
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility