Positive interactions among alpine plants increase with stress Rii dataset.

The primary Rii data for the Callaway et al. Nature paper testing the stress-gradient hypothesis in the alpine via neighbourhood removals. Nature 417, 844-848 (20 June 2002) | doi:10.1038/nature00812; Received 20 February 2002; Accepted 25 March 2002 Positive interactions among alpine plants increase with stress Ragan M. Callaway1, R. W. Brooker2, Philippe Choler3, Zaal Kikvidze4, Christopher J. Lortie5, Richard Michalet6, Leonardo Paolini7, Francisco I. Pugnaire8, Beth Newingham1, Erik T. Aschehoug1,9, Cristina Armas8, David Kikodze4 & Bradley J. Cook1