San Diego Natural History Museum--Your Nature Connection[BRCC San Diego Natural History Museum: Herpetology Department]

BRCC
Birds and Mammals
Post-fire Studies

Birds
 -Introduction
 -Species Tables
 -Species Graphs
 -Species Groupings
 -Census Routes
     Pines Fire Table
     Pines Fire Map
     Cuyamaca Map
     Cedar Fire Table
     Cedar Fire Map
 -Conclusions
 -Acknowledgements

Mammals
 -Introduction
 -Chaparral
     Rodents
     Carnivores
     Bats
     Vegetation
 -Coastal Sage      Rodents
     Vegetation

Field Guide


CONTACT:
Phil Unitt
619.255.0235
fax: 619.232.0248
birds@sdnhm.org

Coastal Sage Scrub

Small Mammals (Rodents)

The northwestern San Diego pocket mouse (Chaetodipus fallax fallax) has been found throughout Rancho Jamul Ecological Reserve.
The northwestern San Diego pocket mouse (Chaetodipus fallax fallax) has been found throughout Rancho Jamul Ecological Reserve

Our study focuses on the demography of small mammals. We are evaluating changes in speciesí spatial distributions and population dynamics (age structure, sex ratios, etc.) through time before and after fire. We are also examining whether demographic patterns are related to the abundance of exotic plants before or after the fire.


Methods

Locations of study plots in Rancho Jamul Ecological Reserve.
Locations of study plots in Rancho Jamul Ecological Reserve.

Our surveys on Rancho Jamul began in 2002, one year before the Otay Fire. Since then, we have been sampling rodents four times per year (in winter, spring, summer, and fall) at each of the 11 plots (9 of which burned in 2003). We added the two additional unburned plots in 2005. During each survey, at each plot, we set out 49 baited Sherman live traps, arranged 1 m apart in a grid of 7 m ◊ 7 m, set for three consecutive nights.


We are currently analyzing the data. Results will follow soon.