Abstract
Context
Habitat fragmentation can alter species distributions and lead to reduced diversity at multiple scales. Yet, the literature describing fragmentation effects on biodiversity patterns is contradictory, possibly because most studies fail to integrate spatial scale into experimental designs and statistical analyses. Thus, it is difficult to extrapolate the effects of fragmentation to large-scaled systems in which conservation management is of immediate importance.
Objectives
To examine the influence of fragmentation on biodiversity across scales, we (1) estimated the effects of habitat area, connectivity, and quality at both local (i.e. community) and regional (i.e. metacommunity) scales; and (2) evaluated the direction, magnitude, and precision of these estimates at both spatial scales.
Methods
We developed a multi-region community occupancy model to analyze 13 years (2005–2017) of amphibian monitoring data within the National Capital Region, a network of U.S. National Parks.
Results
Overall, we found a positive effect of park size and a negative effect of isolation on species richness at the park-level (i.e. metacommunity), and generally positive effects of wetland area, connectivity, and quality on species richness at the wetland-level (i.e. community), although parameter estimates varied among species. Covariate effects were less precise, but effect sizes were larger, at the local wetland-level as compared to the park-level scale.
Conclusions
Our analysis reveals how scale can mediate interpretation of results from scientific studies, which might help explain conflicting narratives concerning the impacts of fragmentation in the literature. Our hierarchical framework can help managers and policymakers elucidate the relevant spatial scale(s) to target conservation efforts.
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Data availability
Code and data are available on Zenodo (https://doi.org/10.5281/zenodo.3600532) and on the Zipkin Quantitative Ecology Lab Github site (https://github.com/zipkinlab/Wright_etal_2020_LandEcol).
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Acknowledgements
We thank the NEARMI field crew, especially AE Dietrich, AB Brand, and C Shafer, and the NCRN Inventory & Monitoring Program for data collection and invaluable technical support. This project was funded by the NPS Inventory and Monitoring Program and the USGS Amphibian Research and Monitoring Initiative. This work was supported in part by Michigan State University through computational resources provided by the Institute for Cyber-Enabled Research. All data presented in this study were obtained in accordance with the USGS Patuxent Wildlife Research Center Animal Care and Use Committee protocol (2008-02). The authors declare that they have no conflict of interest. This paper was greatly improved by many thoughtful suggestions by Sarah P. Saunders, Deahn Donner, Adam Duarte, and one anonymous reviewer. This is contribution #681 of the U.S. Geological Survey, Amphibian Research and Monitoring Initiative (ARMI). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Wright, A.D., Grant, E.H.C. & Zipkin, E.F. A hierarchical analysis of habitat area, connectivity, and quality on amphibian diversity across spatial scales. Landscape Ecol 35, 529–544 (2020). https://doi.org/10.1007/s10980-019-00963-z
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DOI: https://doi.org/10.1007/s10980-019-00963-z