Treesearch

A small population of Burrowing Owls (Speotyto cunicularia) is found in the San Francisco Bay Area, particularly in Santa Clara County. These owls utilize habitat that is dispersed throughout this heavily urbanized region. In an effort to establish a conservation plan for Burrowing Owls in Santa Clara County, a spatial analysis of owl distribution and habitat was performed using remote sensing and geographic information system (GIS) technologies. Land areas that could provide valuable habitat for owls in the future and that could link together groups of owls throughout the region, were...

The proceeding contains 91 papers authored by 143 people from 13 countries covering biology, ecology, monitoring, habitat-use, status conservation, education, genetics, toxicology, diet, migration, mortality and related topics concerning owls of the Northern Hemisphere. Thirty-three owl species are discussed. Information presented will be useful in owl conservation, management, identifying research needs and defining conservation priorities.

An incomplete albino Great Gray Owl (Strix nebulosa) was observed in Vesanto and Kajaani, Finland, 1994-1995. The literature pertaining to albinism in owls indicates that total and incomplete albinism has only been reported in 13 different owl species, the Great Gray Owl being the only species with more than five records. Thus six to seven incomplete albino Great Grays have been recorded since 1980 in Canada, Finland, and the United States.

The Yukon's boreal forest is a slow-growing yet dynamic system greatly affected by wildfire. Trees of a diameter and age to accommodate cavity-nesting owls and other larger birds should be rare. An experiment was conducted by erecting just over 100 nest boxes throughout the southern Yukon to test the availability of nest holes for small owls. After 5 years an insignificant 1 percent of boxes have been used by Boreal Owls (Aegolius funereus). Apparently adequate natural cavities exist. Unique old growth riparian forests are suggested, apparently protected from fire by wetlands. Management...

We studied the nocturnal hunting behavior of eight radio-tagged Eastern Screech-owls (Otus asio; five females and three males) during the period from November 1994 through March 1995. Screech-owls selected low perches when hunting (x = 1.66 m), presumably to obtain a clear view of the ground and an unobstructed flight path to prey. Low perches may also improve the ability of screech-owls to hear and locate prey. Screech-owls used perches at different heights when hunting different types of prey and also tended to perch higher when moonlight was available, perhaps because increased light...

Thank you Mr. Chairman and thank you, Dr. Shoesmith, for your greetings and comments. On behalf of the Wildlife Branch, I, too, want to welcome everyone to Manitoba. I must say that I am overwhelmed by the extent to which the interest and excitement in northern forest owls that we saw here in 1987 has grown since that time. A lot has happened in owl research throughout the world, and a lot has happened in the management of Manitoba's natural resources in the last 10 years.

Forest fragmentation through timber harvesting, agricultural clearing, and other industrial activities is increasing on the Canadian landscape. This study was conducted in order to gain an understanding of habitat requirements for breeding Great Gray Owls (Strix nebulosa) in the forest fragments of central Alberta.

Owlaholics are people who collect anything with an owl on it. This paper gives the most common reasons how and why people become addicted to owls and shows their known distribution. Although thousands of owl collectors and enthusiasts reside all over the world, the majority live in Europe and the United States. While no evidence exists of owl collecting clubs in Latin and South America or Africa and Asia, loads of owlaholics live in Australia. Even such far-flung places as Japan and Fiji can claim a few. Since owlaholics are social, active people, this addiction will probably spread even...

We monitored the threatened Northern Spotted Owl (Strix occidentalis caurina) in Olympic National Park from 1992 through 1996. We used a stratified random sampling scheme to survey 35 plots totaling 236 km?, approximately 10 percent of the forested area of the park.

During the past 9 years we have collected data from calling owls at over 400 sites.