Fish communities in the Anthropocene: detecting drivers of changes in the deep peri-alpine Lake Geneva

AbstractClimate forcing, in combination with local anthropogenic pressures, has drastically modified the physical and chemical properties of lakes worldwide, affecting the abundance and diversity of fish populations. In the context of these combined changes, understanding the interactions between global and local forcing has become a major challenge for developing sustainable fisheries. We analyzed commercial landing statistics of Lake Geneva to describe the long-term changes in the abundance of exploited fish species and to identify mechanisms responsible for fish population changes. We showed a significant relationship between the decrease in phosphorus concentrations and structural changes in the composition of the fish community. Local management of reducing phosphorus loadings played a major role in the recovery of whitefish (Coregonus lavaretus) spawning areas and slowed the process toward more climate-induced percid and cyprinid communities. In addition, rising spring water temperatures have increa...