INFORMING RESTORATION DESIGN: APPLYING CENTRAL VALLEY JOINT VENTURE POPULATION OBJECTIVES FOR GRASSLAND AND AT-RISK RIPARIAN BIRDS | |||
Michael Rogner; River Partners; mrogner@riverpartners.org; Erin Hagen, Sarah Gaffney, Kristen Dybala, Renee Cormier, Haley Mirts, Kim Armstrong | |||
The Central Valley has been dramatically transformed over the last century by human activities, resulting in once abundant bird populations reduced to relatively small populations or locally extinct. In order to inform restoration design and support conservation of Central Valley grassland and riparian birds, we evaluated the success of restoration sites in meeting Central Valley Joint Venture objectives for species' breeding densities. We visited 11 restoration sites in the Sacramento Valley that had both riparian and grassland vegetation, ranging in ages from 5 to 21 years old. Point count surveys were conducted twice in May-June 2023 at 42 riparian and 38 grassland locations. To evaluate the current contribution of each restoration site to meeting CVJV objectives, for each site and habitat type, we compared the mean density estimates ± SE for each species against the short-term (10-year) objectives. We found considerable variation among species, sites, and habitat types in terms of meeting short-term density objectives for focal species. While these evaluations can effectively support bird conservation, improved recommendations for restoration design will arise through increased survey effort and additional survey methods, additional sites across successional stages, evaluation of habitat covariates, indicator scores for biodiversity and consideration of multiple benefits or outcomes simultaneously. | |||
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