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Keyword: Arizona

Deciphering the complexity of historical fire regimes: Diversity among forests of western North America [Chapter 8]

Publications Posted on: October 02, 2019
Wildfire is a key disturbance agent in forests worldwide, but recent large and costly fires have raised urgent questions about how different current fire regimes are from those of the past. Dendroecological reconstructions of historical fire frequency, severity, spatial variability, and extent, corroborated by other lines of evidence, are essential in addressing these questions.

Increasing trends in high-severity fire in the southwestern USA from 1984 to 2015

Publications Posted on: August 19, 2019
In the last three decades, over 4.1 million hectares have burned in Arizona and New Mexico and the largest fires in documented history have occurred in the past two decades. Changes in burn severity over time, however, have not been well documented in forest and woodland ecosystems in the southwestern US.

Interior West Forest Inventory & Analysis: Arizona

Pages Posted on: July 09, 2019
Inventory and monitoring efforts conducted by Rocky Mountain Research Station scientists present a systematic compilation of forest statistics of the state.

Dietary overlap between sympatric Mexican spotted and great horned owls in Arizona

Publications Posted on: August 01, 2018
We estimated diet composition of sympatric Mexican spotted (Strix occidentalis lucida, n = 7 pairs of owls) and great horned owls (Bubo virginianus, n = 4 pairs) in ponderosa pine (Pinus ponderosa) - Gambel oak (Quercus gambelii) forest, northern Arizona. Both species preyed on mammals, birds, and insects; great horned owls also ate lizards. Mammals dominated the diet of both species.

Calling behavior of spotted owls in Northern Arizona

Publications Posted on: August 01, 2018
I studied the calling behavior of radio-tagged Mexican Spotted Owls (Strix occidentalis lucida) in northern Arizona. Owls used a variety of calls, with three call types (Four-note Location Call, Contact Call, and Bark Series) accounting for 86% of calling bouts heard. These calls were used by both sexes, but in significantly different proportions.

Arizona’s forest resources, 2001-2014

Publications Posted on: June 06, 2018
This report presents a summary of the most recent inventory of Arizona’s forests based on field data collected between 2001 and 2014. The report includes descriptive highlights and tables of forest and timberland area, numbers of trees, biomass, volume, growth, mortality, and removals. Most sections and tables are organized by forest type or forest-type group, species group, diameter class, or owner group.

Tree demography records and last recorded fire dates from the Pinaleño Demography Project, Arizona USA

Documents and Media Posted on: November 06, 2017
Enter summary (recommended) or leave this area entirely blank (delete this content) Text in the summary field displays in listings and provides more information to people browsing the site. Text in the summary field does not appear in the body of the page. Document Type: Other Documents

Spatial patterns of ponderosa pine regeneration in high-severity burn patches

Publications Posted on: September 28, 2017
Contemporary wildfires in southwestern US ponderosa pine forests can leave uncharacteristically large patches of tree mortality, raising concerns about the lack of seed-producing trees, which can prevent or significantly delay ponderosa pine regeneration.

Long-term demography of the Northern Goshawk in a variable environment

Publications Posted on: May 17, 2017
The Nearctic northern goshawk (Accipiter gentilis atricapillis) is a resident of conifer, broadleaf, and mixed forests from the boreal to the southwestern montane regions of North America.

Changes in snag populations on National Forest System lands in Arizona, 1990s to 2000s

Publications Posted on: December 30, 2016
Snags receive special management attention as important components of forest systems. We used data from the US Department of Agriculture (USDA) Forest Service Forest Inventory and Analysis Program, collected during two recent time periods (1995 to 1999 and 2001 to 2010), to evaluate trends in snag populations in two forest types in Arizona. Densities of snags ≥4 in.