Abstract
Monitoring is essential to track the long-term recovery of endangered species. Greater emphasis on habitat monitoring is especially important for taxa whose populations may be difficult to quantify (e.g., insects) or when true recovery (delisting) requires continuous species-specific habitat management. In this paper, we outline and implement a standardized framework to facilitate the integration of habitat monitoring with species recovery efforts. The framework has five parts: (1) identify appropriate sample units, (2) select measurable indicators of habitat requirements, (3) determine rating categories for these indicators, (4) design and implement appropriate data collection protocols, and (5) synthesize the ratings into an overall measure of habitat potential. Following these steps, we developed a set of recovery criteria to estimate habitat potential and initially assess restoration activities in the context of recovering an endangered insect, the Karner blue butterfly (Lycaeides melissa samuelis). We recommend basing the habitat potential grading scheme on recovery plan criteria, the latest information on species biology, and working hypotheses as needed. The habitat-based assessment framework helps to identify which recovery areas and habitat patches are worth investing in and what type of site-specific restoration work is needed. We propose that the transparency and decision-making process in endangered insect recovery efforts could be improved through adaptive management that explicitly identifies and tracks progress toward habitat objectives and ultimate population recovery.
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Acknowledgments
This work was made possible by a grant from the New York State Biodiversity Research Institute. We thank Kevin Bright, Jamie Deppen, Alina Leder, Peter Marozas, Jessica Nix, Philip Picotte, Amanda Schaller, and Micah Tavares for their dedication to the field work and data entry. Michael Morrison and several anonymous reviewers provided constructive feedback that led to substantial improvement of the manuscript, and David Braun and J. Michael Scott kindly reviewed an earlier draft. We also thank Brad Stratton for his help with GIS and for making the map figure. Sarah Clarkin and Stephanie Gifford contributed significantly to establishing the recovery criteria and maintaining the years of annual KBB surveys, and Robyn Niver provided support from the US Fish and Wildlife Service.
Ethical standards
All data collection and reporting comply with current US laws, including the Endangered Species Act.
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The authors declare that they have no conflict of interest.
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Bried, J., Tear, T., Shirer, R. et al. A Framework to Integrate Habitat Monitoring and Restoration with Endangered Insect Recovery. Environmental Management 54, 1385–1398 (2014). https://doi.org/10.1007/s00267-014-0351-6
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DOI: https://doi.org/10.1007/s00267-014-0351-6