regional and/or local
2017, 2018, 2019
Management units: 2, 3, 4, 6
From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
||Collaborate with the Natural Community Coalition to repeat the 2012 Southern California Coastal Cactus Wren Genetics Study (Barr et al. 2013, 2015) for the Coastal Orange County-Camp Pendleton, San Diego/El Cajon, Otay, and San Pasqual genetic clusters. Evaluate whether the clusters with low effective population sizes and potential inbreeding have changed their levels of genetic diversity in the intervening 6 years with management to increase cactus scrub and improve connectivity, from translocating wrens between genetic clusters, or from population declines during a long and intense drought.
||Analyze genetic and reproduction data from Orange County and San Diego County studies to determine if reproduction may be adversely affected by inbreeding or low genetic diversity. If lack of genetic diversity and inbreeding show signs of depressing productivity, then evaluate and prioritize specific management recommendations to increase gene flow, such as switching eggs or translocating individuals between genetic clusters over the short term and restoring habitat to expand populations and improve connectivity within and between genetic clusters over the long term.
||Submit project metadata, datasets, analyses, and report with specific management recommendations to the MSP Web Portal.
|Genetic Study Completed and Report Submitted by 2020