NDLI: Movements of cactus bugs: Patch transfers, matrix resistance, and edge permeability

Content Provider	Springer Nature Link
Author	Schooley, Robert L. Wiens, John A.
Copyright Year	2004
Abstract	Individual movement is a key process affecting the distribution of animals in heterogeneous landscapes. For specialist species in patchy habitat, a central issue is how dispersal distances are related to landscape structure. We compared dispersal distances for cactus bugs (Chelinidea vittiger) on two naturally fragmented landscapes (≤ 4% suitable habitat) with different matrix structures (i.e., vegetation height of nonsuitable habitat between suitable patches). Using mark-release-recapture studies, we determined that most transfers between cactus patches occurred during the mating season. Dispersal distances were reduced by > 50% on the landscape that had reduced structural connectivity due to relatively high matrix structure and low patch density. An experiment with detailed movement pathways demonstrated that greater matrix structure decreased mean step lengths, reduced directionality, and thus decreased net displacement by > 60%. However, habitat edges between two matrix elements that differed substantially in resistance to movement were completely permeable. Therefore, the difference in distributions of dispersal distances between the two landscapes mainly reflected the average resistance of matrix habitat and not the level of matrix heterogeneity per se. Our study highlights the merits of combining estimates of dispersal distances with insights on mechanisms from detailed movement pathways, and emphasizes the difficulty of treating dispersal distances of species as fixed traits independent of landscape structure.
Starting Page	801
Ending Page	810
Page Count	10
File Format	PDF
ISSN	09212973
Journal	Landscape Ecology
Volume Number	19
Issue Number	7
e-ISSN	15729761
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Animal movements Chelinidea vittiger Colorado USA Connectivity Dispersal Fragmentation Habitat boundaries Landscape structure Opuntia Patchy population Ecology Landscape Ecology Plant Ecology Forestry Forestry Management Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Geography, Planning and Development Ecology Nature and Landscape Conservation

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