|Authors||Brewer, M.J., O'Hara, R.B., Anderson, B.J. and Ohlemüller, R.|
|Publication details||In "26th International Workshop on Statistical Modelling", 93-98. Eds. Conesa, D., Forte, A., López-Quílez, A. and Muñoz, F.. IWSM 2011, Valencia, Spain.|
|Publisher details||IWSM 2011, Valencia, Spain|
|Keywords||climate envelope; niche modelling; species distribution|
Spatial models of species distribution often include attempts to describe relationships with climate variables via low-degree spline curves; these are commonly termed "climate envelopes". Such curves should typically be either unimodal or monotonic. We propose a simple parametric alternative to spline curves which appeals to biological plausibility and can capture common expected features of species' presence/climate relationships. Furthermore, the methodology can be extended to the multivariate case in a straightforward manner.