Abstract
Nearly half of all photosynthesis happens in the oceans, in communities of microscopic microbial plankton that can vary greatly in time and space. On the one hand these communities are ephemeral, changing with changing ocean conditions, but on the other they can be counted on to cycle in predictable patterns driven by seasons, weather, and ocean currents (1, 2). In PNAS, Sanudo-Wilhelmy et al. (3) explore vitamin concentrations in the oceans, showing that B vitamins are distributed in complex patterns and offering the idea that they might be important factors controlling microbial plankton community composition. The issue considered is not gross ocean productivity but rather the composition of plankton communities, which can impact geochemical cycles.
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