Data presented are 1.) the locations where Coastal Cactus Wren (Campylorhynchus brunneicapillus) genetic samples were collected in southern California, in 2011, 2012, and 2013; 2.) 2012 and 2013 survey results; 3.) the territory locations of all Cactus Wrens detected in 2011, 2012, and 2013 in Orange, Riverside, and San Diego counties; and 4.) dispersal results on a subset of Cactus Wrens color banded in 2011.

We used genome-wide single nucleotide polymorphism (SNP) data and capture-mark-recapture methods to evaluate the genetic diversity and demography within seven focal sites of the endangered San Francisco gartersnake (Thamnophis sirtalis tetrataenia). As Thamnophis sirtalis tetrataenia is listed as endangered by the U.S. Fish and Wildlife Service (USFWS), sensitive location information can be made available upon request by contacting Brian J. Halstead and/or Amy G. Vandergast.

We used genome-wide single nucleotide polymorphism (SNP) data and capture-mark-recapture methods to evaluate the genetic diversity and demography within seven focal sites of the endangered San Francisco gartersnake (Thamnophis sirtalis tetrataenia). As Thamnophis sirtalis tetrataenia is listed as endangered by the U.S. Fish and Wildlife Service (USFWS), sensitive location information can be made available upon request by contacting Brian J. Halstead and/or Amy G. Vandergast.

Data presented are results of surveys for California Gnatcatchers and vegetation sampling conducted in 2020 to address two inter-related questions: (1) How have gnatcatchers and their habitat recovered in areas burned by wildfires in 2003, 2007, and 2014?, and (2) What is the current regional occupancy of gnatcatchers throughout their southern California range? In 2020 a fifth fire category was added (2015-2019) which changed the sample sizes for the other fire categories: 2003-2006 (102 points), 2007-2010 (106 points), 2011-2014 (95 points), 2015-2019 (25 points), unburned (96 points). All post-fire study points were in San Diego County. The regional occupancy surveys included 327 points in 2020 throughout southern California. The post-fire and regional datasets are not mutually exclusive, with some points serving in both analyses. Vegetation data were collected at each point to facilitate analyses identifying habitat correlates of California gnatcatcher occurrence.

Data presented are results of surveys for California Gnatcatchers and vegetation sampling conducted in 2024 to address two inter-related questions: (1) How have gnatcatchers and their habitat recovered in areas burned by wildfires in 2003, 2007, and 2014, and (2) What is the current regional occupancy of gnatcatchers throughout their southern California range? In 2024 additional fire categories (2020-2023) were added as study plots burned between survey years, which resulted in new fire category sample sizes in 2024: 2003-2006 (102 points), 2007-2010 (106 points), 2011-2014 (86 points), 2015-2019 (19 points), 2020-2023 (18 points), unburned (93 points). All post-fire study points were in San Diego County. The regional occupancy surveys included 327 points in 2024 throughout southern California. The post-fire and regional datasets are not mutually exclusive, with some points serving in both analyses. Vegetation data were collected at each point in 2024 to facilitate analyses identifying habitat correlates of California Gnatcatcher occurrence.

Data presented are results of surveys for California Gnatcatchers and vegetation sampling conducted in 2024 to address two inter-related questions: (1) How have gnatcatchers and their habitat recovered in areas burned by wildfires in 2003, 2007, and 2014, and (2) What is the current regional occupancy of gnatcatchers throughout their southern California range? In 2024 additional fire categories (2020-2023) were added as study plots burned between survey years, which resulted in new fire category sample sizes in 2024: 2003-2006 (102 points), 2007-2010 (106 points), 2011-2014 (86 points), 2015-2019 (19 points), 2020-2023 (18 points), unburned (93 points). All post-fire study points were in San Diego County. The regional occupancy surveys included 327 points in 2024 throughout southern California. The post-fire and regional datasets are not mutually exclusive, with some points serving in both analyses. Vegetation data were collected at each point in 2024 to facilitate analyses identifying habitat correlates of California Gnatcatcher occurrence.

Data presented are results of surveys for California Gnatcatchers and vegetation sampling conducted in 2015 and 2016 to address two inter-related questions: (1) How have gnatcatchers and their habitat recovered in areas burned by wildfires in 2003, 2007, and 2014?, and (2) What is the current regional occupancy of gnatcatchers throughout their southern California range? Data for the post-fire study were collected in 2015 and 2016, while the regional occupancy survey was conducted in 2016. In 2015, Gnatcatcher occupancy as a function of fire history was derived from 324 points in the following fire categories: 2003-2006 (106 points), 2007-2010 (111 points), and 2011-2014 (107 points). In 2016, points representing a fourth category, unburned (i.e. before 2002) were added to the design, with the following numbers of points surveyed per category: 2003-2006 (107 points), 2007-2010 (111 points), 2011-2014 (106 points), and unburned (103 points). All post-fire study points were in San Diego County. The regional occupancy survey in 2016 included a total of 334 points throughout southern California. The post-fire and regional datasets are not mutually exclusive, with some points serving in both analyses. Vegetation data were coll

Data presented are results of surveys for California Gnatcatchers and vegetation sampling conducted in 2015 and 2016 to address two inter-related questions: (1) How have gnatcatchers and their habitat recovered in areas burned by wildfires in 2003, 2007, and 2014?, and (2) What is the current regional occupancy of gnatcatchers throughout their southern California range? Data for the post-fire study were collected in 2015 and 2016, while the regional occupancy survey was conducted in 2016. In 2015, Gnatcatcher occupancy as a function of fire history was derived from 324 points in the following fire categories: 2003-2006 (106 points), 2007-2010 (111 points), and 2011-2014 (107 points). In 2016, points representing a fourth category, unburned (i.e. before 2002) were added to the design, with the following numbers of points surveyed per category: 2003-2006 (107 points), 2007-2010 (111 points), 2011-2014 (106 points), and unburned (103 points). All post-fire study points were in San Diego County. The regional occupancy survey in 2016 included a total of 334 points throughout southern California. The post-fire and regional datasets are not mutually exclusive, with some points serving in both analyses. Vegetation data were coll

This project has two goals: Goal 1: The goal of this project is to conduct a statistically rigorous study of occupancy to determine the post-fire recovery of California Gnatcatchers and coastal sage scrub vegetation with the goal of informing management before, during, and after fire. Goal 2: The goal of this project is to conduct rangewide surveys to determine California Gnatcatcher occupancy at a regional scale. Because gnatcatchers will be managed through management of coastal sage scrub rather than through species-specific actions, it is necessary to determine their current status on protected lands in southern California to understand how gnatcatcher occupancy is related to coastal sage scrub plant composition, cover, and structure. This in turn will provide information on where and how coastal sage scrub could be managed and restored to benefit California Gnatcatchers and other inhabitants.

This project has two goals: Goal 1: The goal of this project is to conduct a statistically rigorous study of occupancy to determine the post-fire recovery of California Gnatcatchers and coastal sage scrub vegetation with the goal of informing management before, during, and after fire. Goal 2: The goal of this project is to conduct rangewide surveys to determine California Gnatcatcher occupancy at a regional scale. Because gnatcatchers will be managed through management of coastal sage scrub rather than through species-specific actions, it is necessary to determine their current status on protected lands in southern California to understand how gnatcatcher occupancy is related to coastal sage scrub plant composition, cover, and structure. This in turn will provide information on where and how coastal sage scrub could be managed and restored to benefit California Gnatcatchers and other inhabitants.