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

Chaparral

Vegetation


Short-lobed phacelia
(Phacelia brachyloba)


Fairy lantern (Calochortus albus)

Resprouting chamise
(Adenostoma fasciulatum)

Because recovery of the vegetation will be critical to the patterns of recovery seen among mammals we are also monitoring postfire recovery of plants. Typically, recovery of chaparral includes resprouting of some shrubs from underground root stocks and the emergence of new individuals from seeds surviving in the soil or produced by the resprouting individuals. Herbs may be particularly abundant in the first few years after fire, declining thereafter. This typical pattern, however, may vary in with the fire’s severity (e.g., Moreno and Oechel 1994), and this variation may affect mammals’ recovery.


Methods

We survey vegetation each spring on the 40 plots used for rodent surveys. On each plot we established two permanent 100 m × 1 m belt transects parallel to and 5 m away from the trap lines for rodents. During each vegetation survey we estimate (a) number of plant species (species richness) within each belt transect; (b) plant cover and height along each transect, using a point-intercept sampling method; and (c) density of resprouted shrubs and seedling within ten 1-m2 quadrats along each transect. Within each 1-m2 quadrat we also visually estimate the percentage of the quadrat covered by plants within 10 cm of the ground surface and the vertical density of vegetation to assess the relative “openness” of the habitat from the perspective of rodents.

During the first sampling period in spring 2005, we measured the smallest remaining stems of burned chamise (Adenostoma fasciculatum) to quantify the fire’s severity on each plot (Keeley 1998; Moreno and Oechel 1989). We also noted the presence of possible refugia from the fire, such as large boulders or riparian areas, on or near each plot and collected soil samples to determine soil texture.

Vegetation-sampling transect in burned chaparral within Cleveland National Forest.
Vegetation-sampling transect in burned chaparral within Cleveland National Forest.


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