Read the paper: http://onlinelibrary.wiley.com/doi/10.1111/j.2041-210X.2011.00121.x/abstract
Nicholas Gotelli, University of Vermont, and Fernando T. Maestre, Universidad Rey Juan Carlos, discuss the introduction of simple randomization tests for quantifying the effect of species on ecosystem variables, formalising the use of "natural experiments" to explore their contribution to ecosystem function.
Music © 2008 DoKashiteru: http://ccmixter.org/files/DoKashiteru/16396, Licensed under: http://creativecommons.org/licenses/by/2.5/
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