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Despite regional variation, pinyon jay densities generally increase with local pinyon–juniper cover and heterogeneous ground cover

By Fort Collins Science Center August 26, 2024

In this paper we describe a hierarchical model characterizing local-scale habitat features associated with high densities of pinyon jay (Gymnorhinus cyanocephalus), a species which has been proposed for listing under the Endangered Species Act. 

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a blue pinyon jay sits on a branch of pinyon juniper
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An adult pinyon jay (Gymnorhinus cyanocephalus) perched in a pinyon pine tree. Pinyon jays are a species of conservation concern due to ongoing population declines since at least the 1960s. As a result, land managers are seeking more information regarding pinyon jay habitat needs and how habitat enhancement projects can help bolster their populations. Photo by: Nico Lormand.

 

We used data from a broad-scale, integrated, point count monitoring program (Integrated Monitoring in Bird Conservation Regions; IMBCR), spanning 16 western states, to assess pinyon jay density responses to various ground, shrub, and tree composition and cover estimates collected by on-the-ground surveyors. 

Our results agree with prior research suggesting mechanical removal of pinyon pine and juniper trees may negatively affect pinyon jays, and our models provide guidance to support pinyon jay habitat management.

Full citation: Van Lanen, N.J., A.P. Monroe, and C.L. Aldridge. Despite regional variation, Gymnorhinus cyanocephalus (Pinyon Jay) densities generally increase with local pinyon–juniper cover and heterogeneous ground cover. 2024. Ornithological Applications. https://doi.org/10.1093/ornithapp/duae036 

 

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