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Freshwater Picocyanobacteria: Single Cells, Microcolonies and Colonial Forms

  • Cristiana Callieri
  • Gertrud Cronberg
  • John G. Stockner
Chapter

Summary

This chapter deals with some taxonomic and ecological aspects of picocyanobacteria (Pcy) single-cells, microcolonies and other colonial (CPcy), that are common in lakes throughout the world, and abundant across a wide spectrum of trophic conditions. We discussed phenotypic diversity of Pcy in conjunction with a genotypic approach in order to resolve whether a similar morphology also reflects a phylogenetic relationship. Microcolonies of different size (from 5 to 50 cells) constitute a gradient without a net separation from single-celled types and should be considered Pcy, as transition forms from single-cell to colonial morphotypes. The single-celled Pcy populations tend to be predominant in large, deep oligo-mesotrophic lakes, while the CPcy find optimal conditions in warmer, shallower and more nutrient rich lakes. The knowledge of Pcy diversity in pelagic and littoral zone habitats is a key to understand the dominance of certain genotypes in the water column and of their ubiquity. We devoted some paragraphs to analyse the factors (biotic and abiotic) which can influence the dynamics of the different Pcy forms and we have approached the study of their common ecology.

Keywords

Cyanobacterial Bloom Oligotrophic Lake Dissolve Organic Phosphorus Deep Chlorophyll Maximum Synechococcus Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

Pcy

picocyanobacteria

CPcy

colonial picocyanobacteria

PE-rich

phycoerythrin containing Pcy

PC-rich

phycocyanin containing Pcy

Chl

chlorophyll a

HNF

heterotrophic nanoflagellates

ITS-1

internal transcribed spacer region between the 16S rRNA and 23S rRNA genes

T-RFLP

terminal restriction fragment length polymorphism

DGGE

denaturating gradient gel electrophoresis

ARISA

automated ribosomal intergenic spacer analyses

DCM

deep chlorophyll maximum

OTU

operational taxonomic unit

RT-qPCR

real-time quantitative polymerase chain reaction

FDC

frequency of dividing cells

RUBISCO

ribulose-1,5-bisphosphate carboxylase oxygenase

ELF

enzyme labelled fluorescence

APA

extracellular phosphatase activity

DOP

dissolved organic phosphorus

CPD

cyclobutane pyrimidine dimer

BWF

biological weighting functions

MAAs

mycosporine-like amino acid compounds

Kd

extinction coefficient of photosynthetically active radiation

Notes

Acknowledgements

The authors thank colleagues of the Microbial Ecology group of CNR-ISE Verbania, Italy, for their collaboration and strong support, and equally the Department of Fisheries and Oceans in British Columbia for supporting food chain research in lakes over the past three decades, including the special efforts of staff of Plankton Ecology Laboratory, West Vancouver, notably Ken Shortreed, Erland MacIsaac and Bruce Nidle. We also thank David Scanlan for valuable comments during preparation of the chapter, Roberto Bertoni for providing laboratory facilities in the microbial ecology laboratory at Verbania and Mario Contesini for technical assistance and field work on Lago Maggiore. A special thank to Brian Whitton for his untiring help to improve the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Cristiana Callieri
    • 1
  • Gertrud Cronberg
    • 2
  • John G. Stockner
    • 3
  1. 1.National Research CouncilInstitute of Ecosystem StudyVerbania PallanzaItaly
  2. 2.Aquatic Ecology, Ecology BuildingUniversity of LundLundSweden
  3. 3.Eco-Logic Ltd.West VancouverCanada

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