Cell Size as a Key Determinant of Phytoplankton Metabolism and Community Structure

Annual Review of Marine Science - Tập 7 Số 1 - Trang 241-264 - 2015
Emilio Marañón1
1Departamento de Ecología y Biología Animal, Universidade de Vigo, 36310 Vigo, Spain

Tóm tắt

Phytoplankton size structure controls the trophic organization of planktonic communities and their ability to export biogenic materials toward the ocean's interior. Our understanding of the mechanisms that drive the variability in phytoplankton size structure has been shaped by the assumption that the pace of metabolism decreases allometrically with increasing cell size. However, recent field and laboratory evidence indicates that biomass-specific production and growth rates are similar in both small and large cells but peak at intermediate cell sizes. The maximum nutrient uptake rate scales isometrically with cell volume and superisometrically with the minimum nutrient quota. The unimodal size scaling of phytoplankton growth arises from ataxonomic, size-dependent trade-off processes related to nutrient requirement, acquisition, and use. The superior ability of intermediate-size cells to exploit high nutrient concentrations explains their biomass dominance during blooms. Biogeographic patterns in phytoplankton size structure and growth rate are independent of temperature and driven mainly by changes in resource supply.

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Annual Review of Marine Science

Tập 7 Số 1

241-264

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