Decisions made while searching for settlement sites (e.g., nesting, oviposition) often have major fitness implications. Despite numerous case studies, we lack theory to explain why some species are thriving while others are making poor habitat choices after environmental change. We develop a model to predict (1) which kinds of environmental change have larger, negative effects on fitness, (2) how evolutionary history affects susceptibility to environmental change, and (3) how much lost fitness can be recovered via readjustment after environmental change. We model the common scenario where animals search an otherwise inhospitable matrix, encountering habitats of varying quality and settling when finding a habitat better than a threshold quality level. We consider decisions and fitness before environmental change, immediately following change (assuming that animals continue to use their previously adaptive decision rules), and after optimal readjustment (e.g., via learning or evolution). We find that decreases in survival per time step searching and declines in habitat quality or availability generally have stronger negative effects than reduced season duration. Animals that were adapted to good conditions remained choosy after conditions declined and thus suffered more from environmental change than those adapted to poor conditions. Readjustment recovered much of the fitness lost through a reduction in average habitat quality but recovered much less following reductions in habitat availability or survival while searching. Our model offers novel predictions for empiricists to test as well as suggestions for prioritizing alternative mitigation steps.
|Number of pages||14|
|State||Published - May 1 2019|
Bibliographical noteFunding Information:
We thank Dave Westneat and the Crowley and Sih lab groups for comments and suggestions on these ideas and on the manuscript. Two anonymous reviewers, Pim Edelaar, Janneke Hille Ris Lambers, and Judith Bronstein provided well over 100 useful suggestions for revisions. We acknowledge grant support from National Science Foundation Integrative Organ-ismal Systems (1456724; A. S., principal investigator) and the German Research Foundation (DFG) as part of the SFB TRR (Sonderforschungsbereich/Transregio) 212 (NC³ [niche choice, niche conformance, niche construction]).
We thank Dave Westneat and the Crowley and Sih lab groups forcommentsand suggestionsonthese ideasand on the manuscript. Two anonymous reviewers, Pim Edelaar, Janneke Hille Ris Lambers, and Judith Bronstein provided well over 100 useful suggestions for revisions. We acknowledge grant support from National Science Foundation Integrative Organismal Systems (1456724; A. S., principal investigator) and the German Research Foundation (DFG) as part of the SFB TRR
© 2019 by The University of Chicago.
- Adaptive behavior
- Habitat loss
- Habitat selection
- Human-induced rapid environmental change (HIREC)
- Natal dispersal
- Search costs
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics