Limiting levels of eicosapentaenoic acid: What do we really know?

comments on our original paper from almost 5 yr ago on the differential effects of phosphorus and fatty acids on Daphnia magna growth and reproduction (Becker and Boersma 2005). Brett’s comment gave us the opportunity to revisit the relevant literature, investigate the progress made in the meantime, and suggest directions for further research. One of the outcomes of this exercise was that it became very clear to us that progress in this field has been slower than expected given the methodology we have at hand. Moreover, there is a strong need for a comprehensive review on the effects of limiting resources on herbivorous zooplankton, something that we can obviously not deliver here. We do, however, briefly address those points that are in need of careful revision and further research. In the research field of food quality in aquatic foo