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MarBEF Data System |
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HABs taxon details
context source (ERMS)
Gkelis, S.; Ourailidis, I.; Panou, M.; Pappas, N. (2016). Cyanobacteria of Greece: an annotated checklist. <em>Biodiversity Data Journal.</em> 4: e10084., available online at https://doi.org/10.3897/bdj.4.e10084 [details]
basis of record
Guiry, M.D. & Guiry, G.M. (2023). AlgaeBase. <em>World-wide electronic publication, National University of Ireland, Galway.</em> searched on YYYY-MM-DD., available online at http://www.algaebase.org [details]
From regional or thematic species database
Description Colonies are free floating, microscopic to macroscopic, initially in the form of irregular, tightly aggregated, few-celled, three-dimensional clusters of cells, later more or less spherical or elongated with cells arranged evenly densely, mainly near the colonial surface (almost in a narrow layer), yellowish blue-green, olive-green, brownish to dark brown. The colonies sometimes appear “hollow”(with sparsely distributed cells inside the colonies). Old colonies are large, up to macroscopic, spherical-irregular to lobate with irregular indistinct holes, with cells arranged more or less evenly in fiat, superficial formations, sometimes in indistinct, short rows, but not strictly in one layer. Macroscopie colonies are “cloudy”, irregular, lobate, disintegrating. The margin of colonies (outline of cell agglomeration) is irregular, not distinctly delimited. Mucilage colourless, not extending beyond the cells (not forming a slimy margin around colonies), homogeneous, slightly visible, diffuse. Cells spherical, after division hemispherical, (2.5)3-4.6(4.8) μm diameter, always with numerous, small (“dot-like”) aerotopes. Cell division in very young colonies proceeds in three planes, but the arrangement of cells previously near the surface in old colonies and in indistinct short rows resembles a combination with more simple cell division. The obligatory regularity of cell division in three perpendicular planes in the genus Microcystis should, therefore, be revised. Reproduction occurs by disintegration of colonies into small, mucilaginous clusters of several cells, by solitary liberated cells enveloped by indistinct mucilaginous layer, or by spherical daughter colonies, liberated from the margin of large, old colonies. Examination of the fine structure of cells was difficult. We used the colonies from strain SPC 702, in which partly degraded gas vesicles were found repeatedly in all our specimens. However, the position of densely fasciculated thylakoids and numerous solitary gas vesicles was observed. No other substantial différences from M. protocystis were found.
[details]
Harmful effect Has been found to form microcystin in Lake Arancio in Italy [details]
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