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THE PARADOX OF THE PLANKTON: COMMUNITY STRUCTURE PROMOTES BLOOMS
Citation:
ORME-ZAVALETA, J., P. ELDRIDGE, AND P. A. ROSSIGNOL. THE PARADOX OF THE PLANKTON: COMMUNITY STRUCTURE PROMOTES BLOOMS. Presented at NAB Conference 2007, Columbia, SC, June 03 - 07, 2007.
Impact/Purpose:
Presentation
Description:
ABSTRACT: The 'paradox of the plankton' refers to commensalism as well as symbiosis, predation, and impacts of non equilibrium conditions between two planktonic
competitors. In regards to commensalism, phytoplankton can release organic carbon that enhances growth of its bacterial competitor when both consume a common resource. As such, commensalism creates a three-variable cycle that is potentially destabilizing to the community. However, the loss of stability comes from overcorrection rather than to loss of negative feedback, which is actually enhanced. Although less stable than a three-variable
straight-chain predator-prey system, the 'paradox of the plankton structure' has higher turnover and density levels. Perturbation to this system, whether from above or
below, can lead to loss of regulation; densities and turnover rates increase, leading to an explosive bloom. Our model provides a parsimonious explanation for harmful algal blooms. We discuss similar structures found in various ecological systems.