Biodiversity increases the productivity and stability of phytoplankton communities.

摘要: Global biodiversity losses provide an immediate impetus to elucidate the relationships between biodiversity, productivity and stability. In this study, we quantified effects of species richness combination on stability phytoplankton communities subject predation by a single rotifer species. We also tested one mechanism insurance hypothesis: whether large, slow-growing, potentially-defended cells would compensate for loss small, fast-growing, poorly-defended after predation. There were significant productivity, relative yield, cultures, but importance varied with response variables. Species drove patterns whereas was more important Polycultures containing most productive species, Dunaliella, consistently productive. Yet, rich cultures stable, having low temporal variability in measures biomass. recovered from short-term negative grazing effects, recovery not due compensation slow-growing fast-growing cells. Instead, polyculture result reduced rates persisting small within polycultures. Therefore, although effect polycultures found, indirect unrelated tolerance. hypothesize that diverse assemblages interfered efficient "interference effect" facilitated Dunaliella. summary, demonstrate both composition are driving stability, respectively, biodiverse can alteration consumer functioning. Our findings underscore predator-prey dynamics determining producer communities.