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    Author(s): Quresh S. LatifVictoria A. Saab; Kim Mellen-Mclean; Jonathan G. Dudley
    Date: 2015
    Source: The Journal of Wildlife Management. 79: 263-273.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (390.6 KB)


    Habitat suitability models can provide guidelines for species conservation by predicting where species of interest are likely to occur. Presence-only models are widely used but typically provide only relative indices of habitat suitability (HSIs), necessitating rigorous evaluation often using independently collected presence-absence data. We refined and evaluated presence-only habitat suitability models for nesting white-headed woodpeckers (Picoides albolarvatus), a narrowly distributed species of conservation concern that occupies dry conifer forests of the Inland Pacific Northwest, USA. We developed 2 models using Mahalanobis D2 and Maxent techniques from nest location datasets collected on the eastside of the Cascade Mountain Range,Oregon (1 dataset in 1997–2004 and another, sampling a broader spatial extent, in 2010–2011). Consistent with known ecology of white-headed woodpeckers, both HSI models related positively with percent ponderosa pine, moderate levels of canopy cover (approx. 40%), and moderate-to-high levels of heterogeneity in forest structure. Unlike Mahalanobis HSIs, however, Maxent HSIs were consistently and positively related with nest prevalence and positively related with habitat use estimated with independent point count data. Locations with high MaxentHSIs were characterized by canopy openings adjacent to closed canopy forests. The fact that this habitat feature was described by MaxentHSIs but not by Mahalanobis HSIs possibly explains why MaxentHSIs better predicted white-headed woodpecker occurrence. Additionally, we used presence-absence data for model evaluation that sampled a broader spatial extent than nest surveys and therefore allowed us to demonstrate the generality ofMaxent HSIs. Additional nest location data collected across a broader portion of the species range would be valuable for further model improvement and evaluation, but until such data are available, we recommend use ofMaxentHSIs to guide habitat conservation and restoration efforts in unburned dry forests of Oregon. Published 2014. This article is a U.S. Government work and is in the public domain in the USA.

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    Latif, Quresh S.; Saab, Victoria A.; Mellen-Mclean, Kim; Dudley, Jonathan G. 2015. Evaluating habitat suitability models for nesting white-headed woodpeckers in unburned forest. The Journal of Wildlife Management. 79: 263-273.


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    forest restoration, Mahalanobis D2, Maxent, model validation, Picoides albolarvatus, presence-only models, species distributions

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