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Keyword: Arizona

Fine-scale analysis of Mount Graham red squirrel habitat following disturbance

Publications Posted on: November 16, 2009
Habitat destruction and degradation are major factors in reducing abundance, placing populations and species in jeopardy. Monitoring changes to habitat and identifying locations of habitat for a species, after disturbance, can assist mitigation of the effects of humancaused or -amplified habitat disturbance.

Expanded home ranges in a peripheral population: Space use by endangered Mt. Graham red squirrels

Publications Posted on: November 16, 2009
Peripheral populations are often of increased conservation value; however, knowledge of the ecological and evolutionary consequences of a peripheral location is poor. Spatial dynamics are often interpreted as strategies to maximize access to fitness-limiting resources. Red squirrels Tamiasciurus hudsonicus are territorial in western portions of their range and exhibit overlapping home ranges in eastern forests. Endangered Mt.

Prescribed fire effects on wintering, bark-foraging birds in northern Arizona

Publications Posted on: September 21, 2009
We examined effects of prescribed fire on 3 wintering, bark-foraging birds, hairy woodpeckers (Picoides villosus), pygmy nuthatches (Sitta pygmaea), and white-breasted nuthatches (S. carolinensis), in ponderosa pine (Pinus ponderosa) forests of northern Arizona, USA. During winters of 2004-2006, we compared bird density, foraging behavior, and bark beetle activity among burned treatment and unburned control units.

Private-public collaboration to reintroduce fire into the changing ecosystems of the Southwestern Borderlands region

Publications Posted on: June 18, 2009
Fires caused by lightning or Native Americans were the major ecological factor in the borderlands region of Arizona, New Mexico, and Mexico prior to European settlement. Historical overgrazing and aggressive fire suppression have led to the encroachment of woody vegetation and accumulations of woody fuels in these grasslands.

A plan for landscape fire restoration in the Southwestern Borderlands

Publications Posted on: June 18, 2009
Fires were prevalent in the Southwestern Borderlands of Arizona and New Mexico prior to the arrival of European-American settlers in the 1880s. The almost total exclusion of fires for more than 100 years has been linked to declines in biological diversity and a loss of productivity associated with the encroachment of woody vegetation into the grasslands and open woodlands.

Dalmatian toadflax (Linaria dalmatica) response to wildfire in a Southwestern USA forest

Publications Posted on: May 05, 2009
Severe wildfires often facilitate the spread of exotic invasive species, such as Dalmatian toadflax (Linaria dalmatica). We hypothesized that toadflax growth and reproduction would increase with increasing burn severity in a ponderosa pine (Pinus ponderosa)-dominated forest. We measured toadflax density, cover, flowering stalks, and native species richness and cover on 327 plots for 3 y after a 2001 wildfire.

Invasive plants in Arizona's forests and woodlands

Publications Posted on: May 05, 2009
Climate is critically linked to vegetation dynamics at many different spatial and temporal scales across the desert Southwest. Small-scale, short duration monsoon season thunderstorms can bring much needed precipitation to small patches of vegetation or can initiate widespread flooding.

Pre-wildfire fuel treatments affect long-term ponderosa pine forest dynamics

Publications Posted on: May 05, 2009
The 2002 Rodeo-Chediski fire, the largest wildfire in south-western USA history, burned over treated stands and adjacent untreated stands in the Apache-Sitgreaves National Forest, setting the stage for a natural experiment testing the effectiveness of fuel reduction treatments under conditions of extraordinary fire severity.

Fuel-reduction treatment effects on avian community structure and diversity

Publications Posted on: April 03, 2009
We assessed responses of the breeding bird community to mechanical thinning and prescribed surface fire, alone and in combination, between 2000 and 2006 in ponderosa pine (Pinus ponderosa) forests in northern Arizona, USA. Fuel-reduction treatments did not affect species richness or evenness, and effects on density of 5 commonly detected species varied among species.

Prescribed fire effects on bark beetle activity and tree mortality in southwestern ponderosa pine forests

Publications Posted on: January 14, 2009
Prescribed fire is an important tool in the management of ponderosa pine (Pinus ponderosa Dougl. ex Laws.) forests, yet effects on bark beetle (Coleoptera: Curculionidae, Scolytinae) activity and tree mortality are poorly understood in the southwestern U.S.