Landscape Composition and Pattern around Northern Spotted Owl Nest Sites in Southwest Oregon

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

“…Failure of the model to perform well was likely due, at least in part, to the fact that habitat data used in the model were from 200 ha buffers around call point locations rather than owl roost or nest locations. Ripple et al (1997) found that an index to reproductive rates (see above) at 20 owl sites in the Klamath Province, Oregon, increased with increasing proportion of old conifer forest in the landscape (r = 0.64, P = 0.03). Old conifer forest included open (40 to 59%) and closed (≥ 60%) canopy stands dominated by conifers ≥ 50 cm dbh.…”

“…Neither Irwin et al (in press), Ripple et al (1997), nor Thome et al (1999) measured survival rates in relation to the same independent variables with which they measured reproductive rates, so it is unknown whether the factors positively associated with owl reproduction were also positively associated with owl survival.…”

Assessing the carrying capacity of Perinereis aibuhitensis in a Chinese estuarine wetland using a GIS-based habitat suitability index model

“…GIS has been utilized in ecological modeling as a means of producing the required modeling data on different spatial and temporal scales (Carter et al 2006, Mathys et al 2006. GIS acts as a platform on which models are run and data are stored (Brown et al 1994, Ripple et al 1997, and can be used as a tool for extrapolating the results from a point basis to a spatial basis (Littleboy et al 1996, Osborne et al 2001.…”

Quantifying landscape structure with vegetation inventory maps and remote sensing

“…• The northern spotted owl (Strix occidentalis caurina) : The linkages between population dynamics of the spotted owl (e.g., reproductive rates) and landscape structure have been clarified and used to develop recommendations concerning the amount and quality of old growth and mature forests surrounding nesting sites (Ripple et al 1991(Ripple et al , 1997Peery et al 1999). …”