@article {Perkins014852, author = {T. Alex Perkins and Carl Boettiger and Benjamin L. Phillips}, title = {After the games are over: decay of the Olympic Village effect following invasion implies a trade-off between dispersal and fitness}, elocation-id = {014852}, year = {2015}, doi = {10.1101/014852}, publisher = {Cold Spring Harbor Laboratory}, abstract = {Dispersal is apt to evolve upwards on invasion fronts due to assortative mating by dispersal, a phenomenon known as the {\textquotedblleft}Olympic Village effect{\textquotedblright} or spatial sorting. But what happens after the invasion front has passed? Empirical and theoretical studies have suggested a decline in dispersal following invasion, but hypotheses about what drives this decline have not been clearly articulated or tested. Here we use a simple model of the spatiotemporal dynamics of two dispersal phenotypes to propose a general explanation. Following invasion, spatial sorting drives dispersal of its inhabitants downwards. This shift is fleeting, however, as a mixture of fast and slow phenotypes sets in as equilibrium densities are attained. Afterwards, dispersal only continues to evolve downwards if there is a trade-off between dispersal and fitness at high density. We conclude that empirical observations of declines in dispersal following invasion imply the existence of a trade-off between dispersal and fitness.}, URL = {https://www.biorxiv.org/content/early/2015/02/04/014852}, eprint = {https://www.biorxiv.org/content/early/2015/02/04/014852.full.pdf}, journal = {bioRxiv} }