species richness

Anderson, B.J., Armsworth, P.R., Eigenbrod, F., Thomas, C.D., Gillings, S., Heinemeyer, A., Roy, D.B. & Gaston, K.J. (2009) Spatial covariance between biodiversity and other ecosystem service priorities. Journal of Applied Ecology, 46, 888-896.
Menéndez, R., González-Megías, A., Hill, J.K., Braschler, B., Willis, S.G., Collingham, Y.C., Fox, R., Roy, D.B. & Thomas, C.D. (2006) Species richness changes lag behind climate change. Proceedings of the Royal Society B: Biological Sciences, 273, 1465-1470.