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- W2166449342 abstract "Northern spotted owls (Strix occidentalis caurina) have been studied on Simpson Resource Company’s (formerly Simpson Timber Company) approximately 450,000 acres in coastal Del Norte and Humboldt Counties for the last 14 years. With the exception of a few small isolated old growth stands representing less than 1percent of the ownership, Simpson’s land base is made up of a mosaic of second and third growth forests. The primary silvicultural technique has been and continues to be even age management with clearcutting. Surveys for spotted owls on Simpson’s ownership have occurred continuously since 1989 when the first “hooting transects” were established. The following year in 1990, mark-recapture demography and population density studies were initiated. Since then, a Habitat Conservation Plan (HCP) was developed for the species in 1992 and two master’s studies were completed in 1993 and 1997. The first master’s study was done by Lee Folliard from the University of Idaho and focused on the nesting habitat associations of spotted owls. The data from this study provided much of the basis for the conservation strategy of the HCP. The second master’s study, which quantified the habitat associations of spotted owls with low versus high nesting success, was done by Darrin Thome from Humboldt State University (HSU). An “inhouse” radio telemetry study was conducted from 1998 to 2000 to quantify nighttime (“foraging”) habitat associations of spotted owls. As a corollary to the spotted owl studies, two master’s studies out of HSU were conducted on dusky-footed woodrats (Neotoma fuscipes); the primary prey of spotted owls in this region. Both of these studies estimated the abundance of woodrats in different aged stands. However, the first by Keith Hamm was conducted in coastal redwood (Sequoia sempervirens) forests, while the second thesis by Kevin Hughes was in the Douglas-fir (Pseudotsuga menziesii) zone. During the course of these studies, 783 nests have been located, 1,428 owls have been captured and banded, and movement and foraging data have been obtained using night vision scopes and telemetry on 35 owls. Some of the most important conclusions generated to date from the extensive dataset are as follows: 1. Despite extensive past and current timber harvesting activities, portions of the study area have the highest densities of spotted owls reported in the northwest. Landscapes with the highest densities of spotted owls are a mosaic of mature second growth and recently harvested clearcuts (Diller and Thome 1999)." @default.
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- W2166449342 date "2007-01-01" @default.
- W2166449342 modified "2023-09-26" @default.
- W2166449342 title "Ecology and Management of Northern Spotted Owls on Commercial Timberlands in Coastal Northern California" @default.
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