Attractive sinks, or how individual behavioural decisions determine source-sink dynamics

Gundersen et al. (2001, Source-sink dynamics: how sinks affect demography o f sources. Ecol. Lett., 4, 14-21.) suggested that sinks can severely affect the demography of populations in source habitats. We propose this is a com mon result when animals lack cues associated with reduced fitness inside si nks and consequently select habitat inappropriately. These attractive sinks can result either from undetected risks of mortality (as in the experiment of Gundersen et al. 2001) or from undetected poor breeding probabilities ( due to bioaccumulation of pesticides, for instance). Thus, individual habit at choice is a key process underlying source-sink dynamics.