How do dispersal costs and habitat selection influence realized population connectivity?

Burgess, Scott C., Treml, Eric A. and Marshall, Dustin J. (2012) How do dispersal costs and habitat selection influence realized population connectivity?. Ecology, 93 6: 1378-1387. doi:10.1890/11-1656.1

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Author Burgess, Scott C.
Treml, Eric A.
Marshall, Dustin J.
Title How do dispersal costs and habitat selection influence realized population connectivity?
Journal name Ecology   Check publisher's open access policy
ISSN 0012-9658
Publication date 2012-06-01
Sub-type Article (original research)
DOI 10.1890/11-1656.1
Open Access Status File (Publisher version)
Volume 93
Issue 6
Start page 1378
End page 1387
Total pages 10
Place of publication Ithaca, NY, United States
Publisher Ecological Society of America
Language eng
Abstract Despite the importance of dispersal for population connectivity, dispersal is often costly to the individual. A major impediment to understanding connectivity has been a lack of data combining the movement of individuals and their survival to reproduction in the new habitat (realized connectivity). Although mortality often occurs during dispersal (an immediate cost), in many organisms costs are paid after dispersal (deferred costs). It is unclear how such deferred costs influence the mismatch between dispersal and realized connectivity. Through a series of experiments in the field and laboratory, we estimated both direct and indirect deferred costs in a marine bryozoan (Bugula neritina). We then used the empirical data to parameterize a theoretical model in order to formalize predictions about how dispersal costs influence realized connectivity. Individuals were more likely to colonize poor-quality habitat after prolonged dispersal durations. Individuals that colonized poor-quality habitat performed poorly after colonization because of some property of the habitat (an indirect deferred cost) rather than from prolonged dispersal per se (a direct deferred cost). Our theoretical model predicted that indirect deferred costs could result in nonlinear mismatches between spatial patterns of potential and realized connectivity. The deferred costs of dispersal are likely to be crucial for determining how well patterns of dispersal reflect realized connectivity. Ignoring these deferred costs could lead to inaccurate predictions of spatial population dynamics.
Keyword Brisbane
Bugula neritina
Deferred costs
Dispersal condition
Dispersal phenotype
Landscape structure
Larval quality
Marine bryozoans
Population connectivity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biological Sciences Publications
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