Elemental changes along a temporal and spatial gradient: Does it impact Daphnia-parasite interactions?
Results/Conclusions .Our results show that a higher nutrient availability in time induces a higher sensitivity of Daphnia with respect to changing N:P ratios, which in turn resulted in a higher parasite virulence for these sensitive clones. Secondly, we monitored changes in phytoplankton N- and P-concentration and ratio of 81 ponds. Our results indicate that on a local scale (within 9 km2), phytoplankton N-concentration and N:P ratio increased with the percentage of build-up area around the pond. This altered elemental context impacted the interaction of three different zooplankton species (Daphnia magna, D. pulex and Simocephalus vetulus) with their parasites.