Erik Matthysen (research group EVECO) is an expert in ecology and evolution of animal populations. Eriks research is aimed at the effect of habitat fragmentation and other human interventions in the landscape on the health and sustainability of populations. Eriks focus is on the "ecology of dispersal": how do behaviour and evolution affect mobility of individuals and populations? The research is performed in the context of rapid climate change, urbanization and invasive species. Work is performed at multiple scales: from the analysis of genetic variability to long-term datasets of the occurence and functioning of natural animal populations. Eriks group manages one of the longest running scientific observatories of populations of blue tits. The research is applied in multiple ways: the dispersal of invasive species or important parasites, including ticks.