A century of chasing the ice: delayed colonisation of ice-free sites by ground beetles along glacier forelands in the Alps

Climate change is aff ecting species distribution, composition of biological communities, and species traits. Despite the growing body of knowledge on the reaction of species to climate change, the potentially delayed response of species is still severely understudied. In this paper we modelled the time needed by ground-living invertebrates to eff ectively react to habitat modifi cation induced by climate change in relation to dispersal abilities. We analyzed the occurrence pattern of alpine ground beetles (carabids) along areas recently freed by retreating glaciers in the central-eastern Italian Alps, to test how the synergic eff ects of time since deglaciation and environmental factors may aff ect the colonisation process. Diff erent times of response to climate change in ground beetles were found. Sites already hosting the land cover type suitable for our study taxon, but ice-free for less than 100 yr, are mainly colonised by winged carabid beetles (which have high dispersal abilities and are mostly habitat generalists). No, or very few, wingless species (slow colonizers and ecologically specialized) occur within those sites. " e overall pattern suggests that within a site, suitable land cover is established prior to colonization, due to a strong joint eff ect of time since deglaciation and land cover type. Long-lasting habitat development at the fi ne scale is likely to result in a lack of specifi c resources (e.g. food items, or microhabitat), which is likely to contribute to delayed colonisation, which potentially could be tied also to dispersal abilities. Whatever the reason, the existence of a time-lag often equal to or greater than 100 yr in species colonisation implies caution in predicting species ’ occurrence shifts following climate change.