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Zusammenfassung:
Phytoplankton communities within the photic zones of the oceans and lakes are characterized by highly complex assemblages of unicellular microalgae and associated bacteria. The interconnected evolutionary history of algae and bacteria allowed the formation of a wide spectrum of associations defined by orchestrated nutrient exchange, mutual support with growth factors, quorum sensing mediation, and episodic killing of the partners to obtain more resources. Here we discuss how these cross‐kingdom interactions shape plankton communities that undergo annual, seasonal switching between alternative states with balanced multi species consortia. We illustrate how these microscopic interactions can have consequences that scale‐up to influence global element cycling.
