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This dataset contains 8 layers showing current and predicted ranges of Pacific silver fir(Abies amabilis ). One layer demonstrates range according to current climate conditions averaged from the period 1950-1975. Six layers model predicted ranges according to two different IPCC scenarios according to their Canadian Climate Centre modeling and Analysis (CCCma) third generation general correlation models (CGCM3) A2 and B1, in the years 2020, 2050, and 2080. An 8th layer shows a continuous model of predicted occurrence for the period 1975-2006.
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These maps are a digital representation of the individual tree species range maps of the Atlas of the United States Trees by Elbert L. Little, Jr. The atlas shows the natural distribution or range of the native tree species of North America. These coverages represent 3 volumes of the atlas.
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Projected current and future distributions of Abies amabilis (Pacific silver fir), Abies grandis (Grand fir), Abies procera (Noble fir), Acer macophylla (Big leaf maple), Larix lyallii (Subalpine larch), Larix occidentalis (Western larch), Pinus albicaulis (Whitebark pine), Quercus garryana (Garry oak), Taxus brevifolia (Pacific yew), Thuja plicata (Western red cedar) based on empirical bioclimatic models. Tree distributions models were built using 42 climate and bioclimatic variables from Climate Western North America climate dataset (www.climatevulnerability.org). I used random forest to project USGS range maps (http://esp.cr.usgs.gov/data/little/) for historical (1961-1990) and five general circulation models...


    map background search result map search result map Pacific silver fir (Abies amabilis) extent, North America Modeled frequency and predicted range of Pacific silver fir (Abies amabilis) under various climate scenarios Projected baseline and future tree distributions in the Pacific Northwest for 10 species under five SRES A2 CMIP3 GCMs for 2070-2099 Pacific silver fir (Abies amabilis) extent, North America Modeled frequency and predicted range of Pacific silver fir (Abies amabilis) under various climate scenarios Projected baseline and future tree distributions in the Pacific Northwest for 10 species under five SRES A2 CMIP3 GCMs for 2070-2099