Parent Layer: Environmental Reference Data

Name: NWFP Northern Spotted Owl Nesting Roosting 2012

Display Field: HabitatClass

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Description: This raster map is a mosaic product of six different species distribution model [averaged] outputs produced by machine learning methods implemented in software Maxent (Philips and Dudík 2008). Model outputs were reclassified into four habitat classes as follows (see Davis et al. (2016) pages 7-11 for more details):1 = Unsuitable—Represents the lowest nesting/roosting suitability class, and northern spotted owls (NSOs) will normally avoid using it for nesting and roosting. 2 = Marginal—Represents a condition approaching what NSOs will nest and roost in. Occasionally, these habitat characteristics are associated with nesting and roosting NSOs; however, this could be due to occurrence of legacy habitat features such as large trees, extreme rarity of suitable nesting/roosting habitat, or perhaps interspecific competition with barred owls. 3 = Suitable—Represents the “average” environmental condition associated with the NSO training data. This habitat class represents stand structure and species composition conditions where the probability of NSO presence is higher than expected by random chance and up to average conditions associated with nesting and roosting. 4 = Highly suitable—Represents the most suitable, or “above average,” stand structure and species composition conditions used by nesting and roosting territorial NSO pairs.References:Phillips, S.; Dudík, M. 2008. Modeling of species distributions with maxent: new extensions and a comprehensive evaluation. Ecography. 31: 161–175.

Copyright Text: Davis, Raymond J.; Hollen, Bruce; Hobson, Jeremy; Gower, Julia E.; Keenum, David. 2016. Northwest Forest Plan—the first 20 years (1994–2013): status and trends of northern spotted owl habitats. Gen. Tech. Rep. PNW-GTR-929. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 54 p.

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• Value: Unsuitable
  Label: Unsuitable
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• Value: Marginal
  Label: Marginal
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• Value: Highly Suitable
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