Characteristics of Forests at Spotted Owl Nest Sites in the Pacific Northwest

Abstract

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Diversity and Nest Characteristics of Owl Species Inhabiting Margalla Hills National Park Islamabad, Pakistan

“…So it is vital to study the nest characteristics of owl species. In the current study, most of the field sightings and owl nests were recorded on the lower slopes as reported by some earlier researchers (Blackesley et al, 1992;Seamans and Gutie'rrez, 1995;Hershey et al, 1998) that lower slopes and river terraces were the most productive habitats for owl nesting in northwestern California. Such areas usually have large trees and forest structure needed by spotted owls for nesting.…”

Functional–structural models optimize the placement of foliage units for multiple whole‐canopy functions

“…This provides an explanation for the structural diversity found in oldgrowth conifer forests, which is evident only when the multiple factors are optimized using Pareto optimality. This biodiversity and variability of the performance of plants in forest ecosystems yields further biodiversity in animal habitat, epiphytic distributions, arthropod diversity, and plant distributions (Schowalter 1989;McCune 1993;Hamer and Nelson 1995;Esseen et al 1996;Hershey et al 1998;Sillett and Rambo 2000;Lehmkuhl 2004;Ruth 2005).…”

Forest Structure Within Barred Owl (Strix varia) Home Ranges in the Eastern Cascade Range, Washington

“…Seventy-one percent of nests were in forests dominated by trees ≥ 100 cm dbh with multi-layered canopies; 19% were in forests dominated by trees 50-99 cm dbh with multi-layered canopies; 8% were in forests with a mosaic of small (13-49 cm dbh) and large (≥ 50 cm dbh) trees; 2% were in relatively even-aged forests of trees with dbh 50-99 cm. Hershey et al (1998) measured characteristics of 105 nest trees in four Provinces (Olympic Peninsula, Washington and Coast Range, Klamath and Western Cascades, Oregon). Eightyeight percent of nest trees in Oregon were Douglas fir.…”

“…Potential nest trees were defined as trees with either a cavity > 48 cm along the tree axis, a broken top > 53 cm diameter with live branches over it, or an existing platform nest > 60 cm diameter. Hershey et al (1998) Buchanan and Irwin (1998) by stratifying nests within five Fire Management Analysis Zones (FMAZ). FMAZ were designated by the Wenatchee National Forest based on vegetation associations, topography, precipitation, frequency of lightning strikes, and estimates of fuel loading and fire frequency.…”