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Keyword: California

Prescribed fire effects on field-derived and simulated forest carbon stocks over time

Publications Posted on: May 19, 2014
To better understand the impact of prescribed fire on carbon stocks, we quantified aboveground and belowground carbon stocks within five pools (live trees and coarse roots, dead trees and coarse roots, live understory vegetation, down woody debris, and litter and duff) and potential carbon emissions from a simulated wildfire before and up to 8 years after prescribed fire treatments.

Modeling seasonal detection patterns for burrowing owl surveys

Publications Posted on: January 28, 2014
To guide monitoring of burrowing owls (Athene cunicularia) in the Coachella Valley, California, USA, we analyzed survey-method-specific seasonal variation in detectability. Point-based call-broadcast surveys yielded high early season detectability that then declined through time, whereas detectability on driving surveys increased through the season. Point surveys without call-broadcasts yielded the lowest detectability rates overall.

Spatial regression methods capture prediction uncertainty in species distribution model projections through time

Publications Posted on: June 27, 2013
The uncertainty associated with species distribution model (SDM) projections is poorly characterized, despite its potential value to decision makers. Error estimates from most modelling techniques have been shown to be biased due to their failure to account for spatial autocorrelation (SAC) of residual error.

Estimating abundance and survival in the endangered Point Arena Mountain beaver using noninvasive genetic methods

Publications Posted on: June 27, 2013
The Point Arena mountain beaver (Aplodontia rufa nigra) is federally listed as an endangered subspecies that is restricted to a small geographic range in coastal Mendocino County, California. Management of this imperiled taxon requires accurate information on its demography and vital rates.

Small geographic range but not panmictic: how forests structure the endangered Point Arena mountain beaver (Aplodontia rufa nigra)

Publications Posted on: August 23, 2012
The landscape genetics framework is typically applied to broad regions that occupy only small portions of a species' range. Rarely is the entire range of a taxon the subject of study. We examined the landscape genetic structure of the endangered Point Arena mountain beaver (Aplodontia rufa nigra), whose isolated geographic range is found in a restricted (85 km2) but heterogenous region in California.

Quantifying the consequences of fire suppression in two California national parks

Publications Posted on: December 04, 2009
Excluding fire can have untold ecological effects. Decades of fire suppression in national parks and other protected areas have altered natural fire regimes, vegetation, and wildlife habitat (Chang 1996; Keane et al. 2002).

Long-term kinematics and sediment flux of an active earthflow, Eel River, California

Publications Posted on: December 02, 2009
Although earthflows are the dominant erosion mechanism in many mountainous landscapes, estimates of long-term earthflow-driven sediment flux remain elusive because landslide displacement data are typically limited to contemporary time periods.

Lichens, ozone, and forest health - exploring cross-indicator analyses with FIA data

Publications Posted on: July 20, 2009
Does air pollution risk represented by a lichen bioindicator of air pollution, an ozone bioindicator, or a combination of both, correlate with forest health as reflected by condition of tree crowns and other variables? We conducted pilot analyses to answer this question using Forest Inventory and Analysis (FIA) data from the Sierra Nevada region of California and the New England region; they have very different environments.

Determining the population boundaries of a narrowly endemic perennial plant, Lane Mountain milk-vetch, in San Bernardino County, California

Publications Posted on: April 01, 2008
The Lane Mountain milk-vetch (Astragalus jaegerianus) is a federally endangered species. It was first discovered in 1939 by Edmund Jaeger in the central Mojave Desert of California. This plant species was not collected again until the army became interested in expanding Fort Irwin’s western boundary in the 1980’s. Following its rediscovery, volunteers eventually found a few scattered plants in three populations within a 10-mile radius.

Efficacy of the California Bureau of Land Management Community Assistance and Hazardous Fuels Programs

Publications Posted on: September 19, 2007
This study provides a framework for assessing the social and environmental benefits and public education outcomes associated with the U.S. Department of the Interior, Bureau of Land Management’s Community Assistance and Hazardous Fuel Programs in California.