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    Author(s): Tara M. Barrett; Greg Latta; Paul E. Hennon; Bianca N.I. Eskelson; Hailemariam Temesgen
    Date: 2012
    Source: Canadian Journal of Forestry Research. 42: 642-656
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (1.59 MB)


    Dwarf mistletoes (Arceuthobium species) influence many processes within forested ecosystems, but few studies have examined their distribution in relation to climate. An analysis of 1549 forested plots within a 14.5 million ha region of southeast Alaska provided strong indications that climate currently limits hemlock dwarf mistletoe (Arceuthobium tsugense (Rosendahl) G.N. Jones) to a subset of the range of its primary tree host, western hemlock (Tsuga heterophylla (Raf.) Sarg.), with infection varying from a high of 20% of trees at sea level to only 5% by 200 m elevation. Three types of modeling approaches (logistic, most similar neighbor, and random forests) were tested for the ability to simultaneously predict abundance and distribution of host and pathogen as a function of climate variables.

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    Barrett, Tara M.; Latta, Greg; Hennon, Paul E.; Eskelson, Bianca N.I.; Temesgen, Hailemariam. 2012. Host-parasite distributions under changing climate: Tsuga heterophylla and Arceuthobium tsugense in Alaska. Canadian Journal of Forestry Research. 42: 642-656.


    climate envelope models, species distribution modeling, climate niche, climate change, dispersal

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