1. California Gnatcatcher
Jacob Grisham, Kristen Murray, Teague Corning

2. Objectives
Identify nesting habitat suitability for california gnatcatcher (CAGN)
Qualitatively compare presence survey data on CAGN spatial distribution with our
habitat suitability model.

3. Introduction
Land managers use the California Gnatcatcher as an indicator species for CSS health
and as an umbrella species for conserving CSS biodiversity.
Before agriculture and urban development, CSS range was 90% LARGER 50-100
years ago than it is today.
This species remains listed as threatened by the USFWS since 1993.
In Orange and San Diego county, what are the suitable habitat areas for the California
Gnatcatcher so that planners can prioritize conservation of core areas and land
managers can plan restoration efforts.

4. Study Area
Orange County and San Diego
County
Polioptila californica californica is
1 of 3 subspecies. This is the
coastal ranging subspecies
Only found data of CAGN
presence for Orange and San
Diego Counties

5. Methods (sources)
Data Basin (database) for
Vegtype
Data.gov
for Gnatcatcher presence surveys
dfg.ca.gov/biogeodata/gis/clearinghouse for streams
frap.cdf.ca.gov/data/frapgisdata for fire perimeters
USGS
for elevation
pre-installed data

8. Streams

9. Stream Buffer

10. Elevation (m)

11. Slope
HUGE MISTAKE

13. Fire Sage Scrub Age