Data needs for avian conservation biology: have we avoided critical research?

Article Abstract:

A conservation strategy for the Northern Spotted Owl (Strix occidentalis caurina) proposes relatively large blocks of habitat suitable for multiple breeding pairs. These habitats should be distributed throughout the current range of the subspecies. They should be separated by distances consistent with observed dispersal distances of juvenile owls. All these should be embedded in a landscape of habitat that allows foraging, resting and cover by birds dispersing between flocks. Researches on important topics of conservation planning must be undertaken to help endangered species.

Planning, Endangered species, Wildlife conservation

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Habitat use and population characteristics of the white-tailed ptarmigan in the Sierra Nevada, California

Article Abstract:

White-tailed ptarmigan released in the Sierra Nevada colonized alpine habitats 114 km south and 79 km north of the release sites after 18 years. The composite population was 59.29% male and 40.71% female, with yearlings making up 30% of the breeding season population. Average annual brood size ranged from 2.6 to 2.8 chicks. The availability of mesic vegetation determined the distribution of ptarmigan. The birds preferred areas with dwarf willow cover near water sources during both breeding and nonbreeding seasons.

Bird populations, Habitat selection, Ptarmigans

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Foraging habitat and home-range characteristics of California spotted owls in the Sierra nevada

Article Abstract:

California spotted owls in the Sierra Nevada selected forests withlarger trees and canopy closures of at least 40%. Discriminant function analysis showed that the number of vegetative strata, large-tree basal areas and canopy closure were the most important characteristics of owl microhabitats. The median home range size was 1,439 hectares, similar to that of the northern spotted owl.

Analysis, Ecological research

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