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Keyword: Arizona

Geologic influences on Apache trout habitat in the White Mountains of Arizona

Publications Posted on: March 14, 2008
Geologic variation has important influences on habitat quality for species of concern, but it can be difficult to evaluate due to subtle variations, complex terminology, and inadequate maps. To better understand habitat of the Apache trout (Onchorhynchus apache or O.

Hydrology of southwestern encinal oak ecosystems: A review and more

Publications Posted on: March 13, 2008
Information about the hydrology of oak ecosystems of the southwestern United States and northern Mexico is lacking (Lopes and Ffolliott 1992, Baker et al. 1995) even though the woodlands and savannas cover more than 31,000 square miles. These ecosystems generally are found between 4,000 and 7,300 feet in elevation. Precipitation occurs in the winter and summer and averages between 15 and 20 inches annually.

Chapter 6: Research needs for the conservation of the cactus ferruginous pygmy-owl in Arizona

Publications Posted on: December 13, 2007
In this chapter, we describe research needs for the conservation of the cactus ferruginous pygmy-owl (Glaucidium brasilianum cactorum) in Arizona. Estimates of population size, structure, and dynamics, as well as demographic data, are needed for the recovery team to formulate sound population objectives.

Chapter 4: The ferruginous pygmy-owl in the tropics and at the northern end of its range: Habitat relations and requirements

Publications Posted on: December 13, 2007
The habitat needs of the ferruginous pygmy-owl (Glaucidium brasilianum) are poorly understood. In the tropics, this common bird of prey inhabits many distinct vegetation communities or environments (e.g., Monroe 1968, Meyer de Schauensee 1970, Stiles and Skutch 1989, Sick 1993). A resident of woodlands and open forests, it is also found in the open, perched on telephone lines or fence posts (Ridgely 1976).

Chapter 3: The status of the cactus ferruginous pygmy-owl in Arizona: Population surveys and habitat assessment

Publications Posted on: December 13, 2007
In 1993, the Arizona Game and Fish Department (AGFD) began formal population surveys in an attempt to document the numbers and distribution of cactus ferruginous pygmy-owls (Glaucidium brasilianum cactorum) in Arizona. Surveys were initiated to gather information on this little-known subspecies which was considered for listing at the time.

Chapter 2: A historical perspective on the population decline of the cactus ferruginous pygmy-owl in Arizona

Publications Posted on: December 13, 2007
The cactus ferruginous pygmy-owl (Glaucidium brasilianum cactorum) was discovered in the U.S. by Bendire in 1872 in the Tucson area (Coues 1872). During the next five decades, naturalists collected many specimens of this owl and typically described the subspecies as common or fairly common along some streams and rivers of central and southern Arizona.

Chapter 1: The cactus ferruginous pygmy-owl: Taxonomy, distribution, and natural history

Publications Posted on: December 13, 2007
The cactus ferruginous pygmy-owl (Glaucidium brasilianum cactorum) is a small, cryptic owl that is often difficult to observe. Its natural history and conservation needs are poorly understood. Despite ongoing research in Texas and Arizona, the available information remains limited.

Introduction

Publications Posted on: December 13, 2007
In March 1997, the U.S. Fish and Wildlife Service listed the Arizona population of the cactus ferruginous pygmy-owl (Glaucidium brasilianum cactorum) as endangered under the Endangered Species Act (U.S. Fish and Wildlife 1997). Federal listing for the owl in Arizona resulted from a petition submitted in 1992 to the U.S. Fish and Wildlife Service (Galvin et al. 1992, U.S. Fish and Wildlife 1994).

Ecology and conservation of the cactus ferruginous pygmy-owl in Arizona

Publications Posted on: December 12, 2007
This report is the result of a cooperative effort by the Rocky Mountain Research Station and the USDA Forest Service Region 3, with participation by the Arizona Game and Fish Department and the Bureau of Land Management. It assesses the state of knowledge related to the conservation status of the cactus ferruginous pygmy-owl in Arizona.

Snowpack-runoff relationships for mid-elevation snowpacks on the Workman Creek watersheds of Central Arizona

Publications Posted on: December 11, 2007
Snowpacks in the southwestern United States melt intermittently throughout the winter. At some mid-elevation locations, between 7,000 and 7,500 ft, snowpacks appear and disappear, depending on the distribution of storms during relatively dry winters. Some winter precipitation can occur as rain during warm storms and is not reflected in the snow course data.

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