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1 March 2008 Picophytoplankton in Freshwater Ecosystems: The Importance of Small-Sized Phototrophs
Cristiana Callieri
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Abstract

About 40 years have passed since the discovery of picophytoplankton; the present knowledge of the taxonomy physiology and ecology of these tiny photoautotrophic cells offers new perspectives on the importance of the microbial contribution to global biogeochemical cycles and food webs. This review focuses on the relationships among the components of picophytoplankton (picocyanobacteria and the picoplanktic eukaryotes) and biotic and abiotic environmental factors. The dynamics of picophytoplankton in aquatic ecosystems are strictly dependent upon basin size and trophy, temperature, and nutrient and light limitation, but they are also regulated by grazing and viral-induced lysis. The review considers: the pros and cons of the molecular approach to the study of the taxonomy of freshwater Synechococcus spp.; the importance of ecological aspects in understanding the puzzle of picophytoplankton phylogeny (genotype vs ecotype); and the role of biotic vs abiotic interactions in controlling picophytoplankton dynamics. Biotic, top-down control mechanisms are reviewed as well as knowledge of other biological interactions.

© Freshwater Biological Association 2007
Cristiana Callieri "Picophytoplankton in Freshwater Ecosystems: The Importance of Small-Sized Phototrophs," Freshwater Reviews 1(1), 1-28, (1 March 2008). https://doi.org/10.1608/FRJ-1.1.1
Received: 20 April 2007; Accepted: 19 May 2007; Published: 1 March 2008
JOURNAL ARTICLE
28 PAGES

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KEYWORDS
ecology
freshwater autotrophic picoplankton
historical perspectives
phylogenetic diversity
Picocyanobacteria
picoeukaryotes
population dynamics
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