Cyanobacteria on a eutrophic lake shore
Numéro d’image : 11731383
| Cyanobacteria (blue-green algae) at the edge of a eutrophic lake. The picture shows patches of cyanobacteria,appearing as a green granular scum stranded on the surface of mud at the shoreline. 5-15cm in size,each patch contains millions of living cells Cyanobacteria are simple prokaryotic organisms lacking a cell nucleus,and are not correctly named algae. Many genera of cyanobacteria produce toxins which can affect the nerves,skin and liver of humans. The most commonly encountered freshwater genus is Microcystis; It produces a hepatotoxins called microcystins,which are cyclic peptides. Blooms occur after periods of hot weather,and are associated with eutrophication - an increase in nutrient levels in the water caused by factors such as pollution from wastewater,agricultural run-off,or large water bird populations | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 5212 px × 3468 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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