Many (see below)
Microcystis is a microcystin producing genus of freshwater cyanobacteria which includes the harmful algal bloom Microcystis aeruginosa. Cyanobacteria produce two groups of toxin, neurotoxins and peptide hepatotoxins, such as microcystin and cyanopeptolin.
The generic moniker Microcystis derives from the Greek mikros ("small") + kystis ("bladder")
As the etymological derivation implies, Microcystis is characterized by small cells (a few micrometers in diameter), which lack individual sheaths. The cells are usually organized into colonies (large colonies of which may be viewed with the naked eye) that begin in a spherical shape, but losing their coherence to become perforated or irregularly shaped over time. The coloration of the protoplast is a light blue-green, appearing dark or brown due to optical effects of gas-filled vesicles; this can be useful as a distinguishing characteristic when using light microscopy.
Among Microcystis species are the following:
- Microcystis aeruginosa
- Microcystis argentea
- Microcystis elongata
- Microcystis holsatica
- Microcystis lutescens
- Microcystis marina
- Microcystis pallida
- Microcystis salina
- Microcystis thermalis
- Microcystis viridis
- Oberholster, PJ. "Microcystis aeruginosa: source of toxic microcystins in drinking water". African Journal of Biotechnology March 2004 Volume 3 pp 159-168. Retrieved August 4, 2014.
- "On the Evolution of Nonribosomal Peptide Synthetase Gene Clusters in Cyanobacteria". University of Oslo. 2007.
- Karl Gademann, Cyril Portmann, Judith F. Blom, Michael Zeder and Friedrich Jüttner (2010). "Multiple Toxin Production in the Cyanobacterium Microcystis: Isolation of the Toxic Protease Inhibitor Cyanopeptolin 1020". J. Nat. Prod. doi:10.1021/np900818c.
- "Cyanobacteria: Microcystis". The Silica Secchi Disk. Connecticut College: The SilicaSecchi Disk. Retrieved 24 June 2011.[dead link]
- "Taxonomy Browser Genus: Microcystis". Taxonomy Browser Genus: Microcystis. AlgaeBase. Retrieved 24 June 2011.
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