Spatial Data: Climate data from WorldClimSteven GrayNovember 5, 2015Data Category: Climate Data Data Description: WorldClim (also Bioclim) is a public resource that provides global climate data. Data Link: http://www.worldclim.org/ Data Use Policy: “This dataset is freely available for academic and other non-commercial use. Redistribution, or commercial use is not allowed without prior permission.” Use with R: WorldClim climate data can be downloaded directly by using several R packages. Here I will use the “raster” package, as shown below for annual precipitation, which I will subset for South Africa. For use with software other than R, browse “current” data here: http://www.worldclim.org/current
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Species Distribution Model: BioclimSteven GrayNovember 16, 2015Model Category: Climate-envelope-model Model Description: Bioclim compares values of environmental variables to the percentile distribution of values at occurence locations to determine similarity.Values around the median are deemed suitable locations with the tails of the percentile being less suitable. Model Assumptions: Species distribution is influenced by climatic variables and at the scale of climate variables, climate variables are normally distributed, and variables influence study species. Model Response Data: Presence-only. Model Explanatory Data: Mainly used for continuous climate variables. GARP was created as a model that has less restrictive assumptions than Bioclim. Model Links and Use with R: linked phrase linked phrase Example Papers: Thorne, J. H., Seo, C., Basabose, A., Gray, M., Belfiore, N. M., & Hijmans, R. J. (2013). Alternative biological assumptions strongly influence models of climate change effects on mountain gorillas. Ecosphere, 4(9), art108. Gomez, J. J., & Cassini, M. H. (2014). Analysis of environmental correlates of sexual segregation in northern elephant seals using species distribution models. Marine biology, 161(2), 481-487. Example with R:
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Spatial Ecology @ MSUClick on "Category" below to search for R code compiled by the Zarnetske Spatial & Community Ecology Lab and students in MSU's Spatial Ecology graduate course (FOR870/FW870) Category
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