The scale of effect of landscape context varies with the species’ response variable measured - Landscape Ecology
- ️Fahrig, Lenore
- ️Mon Apr 01 2019
Abstract
Context
To detect an effect of landscape context on a species’ response, the landscape variables need to be measured within the appropriate distance from the species’ response, i.e. at the scale of effect. However, it is not clear what factors determine the scale of effect.
Objective
Our objective was to test the prediction that the scale of effect should be smallest when the species’ response is fecundity, larger for abundance, and larger still for occurrence.
Methods
We compared the scale of effect of two landscape variables (road density, forest proportion) on the three responses (fecundity, abundance, occurrence) for the wood frog (Lithobates sylvaticus) in eastern Ontario, Canada. We used egg mass surveys of 34 ponds to estimate fecundity (mean eggs/mass), abundance (number of masses), and occurrence (presence/absence of egg masses). We then empirically estimated the scale of effect of each landscape variable on each response.
Results
The scale of effect differed among responses, from 0.2 to 3.0 km radii; however, it did not vary in the predicted order. Furthermore, the order was not consistent between the two landscape variables.
Conclusions
Our results show that the scale of effect of a landscape variable on a given species can differ for different response variables. However, they also suggest that these differences in the scale of effect are not predictable. Thus, the most reliable way to ensure a landscape context study is conducted at the correct spatial extent is to estimate the scale of effect empirically, rather than ‘guesstimating’ the extent a priori.
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Acknowledgements
We thank the private landowners who let us sample their ponds. Erik Pervin and Caitlin Brunton were indispensable field assistants. We thank Joseph Bennett and Jeremy Kerr for helpful comments and suggestions. We also thank the associate editor and two anonymous reviewers for their comments on an earlier version of this paper. This work was supported by a Natural Sciences and Engineering Research Council of Canada Grant to Lenore Fahrig.
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Author notes
Andrew D. Moraga
Present address: School of Environment Resources and Sustainability, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
Authors and Affiliations
Geomatics and Landscape Ecology Research Laboratory, Department of Biology, Carleton University, 1125 Colonel By Dr., Ottawa, ON, K1S 5B6, Canada
Andrew D. Moraga, Amanda E. Martin & Lenore Fahrig
Environment and Climate Change Canada, National Wildlife Research Centre, 1125 Colonel By Dr., Ottawa, ON, K1S 5B6, Canada
Amanda E. Martin
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- Andrew D. Moraga
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- Lenore Fahrig
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Correspondence to Amanda E. Martin.
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The authors declare that they have no conflict of interest.
Ethical standard
All work complied with the Canadian Council on Animal Care requirements for the use of eggs in research (Category of Invasiveness A).
Data availability
The data sets generated during the current study are available in the Mendeley Data repository, https://doi.org/10.17632/ccw64rpj22.1.
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Moraga, A.D., Martin, A.E. & Fahrig, L. The scale of effect of landscape context varies with the species’ response variable measured. Landscape Ecol 34, 703–715 (2019). https://doi.org/10.1007/s10980-019-00808-9
Received: 06 September 2018
Accepted: 21 March 2019
Published: 01 April 2019
Issue Date: 15 April 2019
DOI: https://doi.org/10.1007/s10980-019-00808-9