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High interindividual variability in habitat selection and functional habitat relationships in European nightjars over a period of habitat change

Mitchell, Lucy J.; Kohler, Tim; White, Piran C. L.; Arnold, Kathryn E.

Authors

Tim Kohler

Piran C. L. White

Kathryn E. Arnold



Abstract

An animal's choice of foraging habitat reflects its response to environmental cues and is likely to vary among individuals in a population. Analyzing the magnitude of individual habitat selection can indicate how resilient populations may be to anthropogenic habitat change, where individually varying, broadly generalist populations have the potential to adjust their behavior. We collected GPS point data from 39 European nightjars (Caprimulgus europaeus) at a UK breeding site where restoration measures have altered large areas of habitat between breeding seasons. We calculated individual habitat selection over four breeding seasons to observe changes that might align with change in habitat. We also analyzed change in home range size in line with change in habitat availability, to examine functional relationships that can represent trade‐offs made by the birds related to performance of the habitat.

Individual explained more of the variation in population habitat selection than year for most habitat types. Individuals differed in the magnitude of their selection for different habitat types, which created a generalist population composed of both generalist and specialist individuals. Selection also changed over time but only significantly for scrub habitat (60% decrease in selection over 4 years). Across the population, individual home range size was 2% smaller where availability of cleared habitat within the home range was greater, but size increased by 2% where the amount of open water was higher, indicating the presence of trade‐offs related to habitat availability. These results highlight that using individual resource selection and specialization measures, in conjunction with functional responses to change, can lead to better understanding of the needs of a population. Pooling specialist and generalist individuals for analysis could hide divergent responses to change and consequently obscure information that could be important in developing effective conservation strategies.

Citation

Mitchell, L. J., Kohler, T., White, P. C. L., & Arnold, K. E. (in press). High interindividual variability in habitat selection and functional habitat relationships in European nightjars over a period of habitat change. Ecology and Evolution, https://doi.org/10.1002/ece3.6331

Journal Article Type Article
Acceptance Date Apr 14, 2020
Online Publication Date May 7, 2020
Deposit Date May 10, 2020
Publicly Available Date May 12, 2020
Journal Ecology and Evolution
Electronic ISSN 2045-7758
Publisher Wiley
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1002/ece3.6331
Keywords Caprimulgus; Functional response; GPS tracking; Habitat selection; Individual behavior
Public URL https://hull-repository.worktribe.com/output/3504358
Publisher URL https://onlinelibrary.wiley.com/doi/10.1002/ece3.6331
Additional Information Received: 2019-09-16; Accepted: 2020-04-14; Published: 2020-05-07

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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.© 2020 The Authors.





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