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Thin layers of phytoplankton are important hotspots of ecological activity that are found in the coastal ocean, meters beneath the surface, and contain cell concentrations up to two orders of magnitude above ambient concentrations. Current interpretations of their formation favor abiotic processes, yet many phytoplankton species found in these layers are motile. We demonstrated that layers formed when the vertical migration of phytoplankton was disrupted by hydrodynamic shear. This mechanism, which we call gyrotactic trapping, can be responsible for the thin layers of phytoplankton commonly observed in the ocean. These results reveal that the coupling between active microorganism motility and ambient fluid motion can shape the macroscopic features of the marine ecological landscape.

Original publication

DOI

10.1126/science.1167334

Type

Journal article

Journal

Science

Publication Date

20/02/2009

Volume

323

Pages

1067 - 1070

Keywords

Animals, Biomechanical Phenomena, Cell Shape, Chlamydomonas, Ecosystem, Flagella, Gravitation, Movement, Phytoplankton, Water, Water Movements