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Open-File Report 2015–1017

Prepared in cooperation with the California Landscape Conservation Cooperative, California Department of Fish and Wildlife, and U.S. Fish and Wildlife Service

A Framework for Modeling Anthropogenic Impacts on Waterbird Habitats—Addressing Future Uncertainty in Conservation Planning

By Elliott L. Matchett, Joseph P. Fleskes, Charles A. Young, and David R. Purkey


The amount and quality of natural resources available for terrestrial and aquatic wildlife habitats are expected to decrease throughout the world in areas that are intensively managed for urban and agricultural uses. Changes in climate and management of increasingly limited water supplies may further impact water resources essential for sustaining habitats. In this report, we document adapting a Water Evaluation and Planning (WEAP) system model for the Central Valley of California. We demonstrate using this adapted model (WEAP-CVwh) to evaluate impacts produced from plausible future scenarios on agricultural and wetland habitats used by waterbirds and other wildlife. Processed output from WEAP-CVwh indicated varying levels of impact caused by projected climate, urbanization, and water supply management in scenarios used to exemplify this approach. Among scenarios, the NCAR-CCSM3 A2 climate projection had a greater impact than the CNRM-CM3 B1 climate projection, whereas expansive urbanization had a greater impact than strategic urbanization, on annual availability of waterbird habitat. Scenarios including extensive rice-idling or substantial instream flow requirements on important water supply sources produced large impacts on annual availability of waterbird habitat. In the year corresponding with the greatest habitat reduction for each scenario, the scenario including instream flow requirements resulted in the greatest decrease in habitats throughout all months of the wintering period relative to other scenarios. This approach provides a new and useful tool for habitat conservation planning in the Central Valley and a model to guide similar research investigations aiming to inform conservation, management, and restoration of important wildlife habitats.

First posted February 2, 2015

For additional information, contact:
Director, Western Ecological Research Center
U.S. Geological Survey
3020 State University Drive East
Sacramento, California 95819

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Suggested citation:

Matchett, E.L., Fleskes, J.P., Young, C.A., and Purkey, D.R., 2015, A framework for modeling anthropogenic impacts on waterbird habits—Addressing future uncertainty in conservation planning: U.S. Geological Survey Open-File Report 2015-1017, 40 p.,

ISSN 2331-1258 (online)









References Cited

Appendix A. Description of Water Evaluation and Planning System Model for the Central Valley (WEAP-CV) and Adapted for Waterbird Habitats (WEAP-CVwh) Used in Scenario Modeling

Appendix B. Information Used in Producing Water Evaluation and Planning System Model for the Central Valley of California Adapted for Waterbird Habitat (WEAP-CVwh) for the Scenario Modeling Approach

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