Blue-green algae are represented by single-celled, filamentous and colonial forms.Their color depends on the level of pigments (chlorophyll, phycoerythrin, phycocyanin, carotene).Thus, they may be blue-green, olive green or yellow-green, for example.They have issued the nucleus and chromatophore.Blue-green algae are represented by the following genera Nostoc, oscillators, gleotrihiya, Annaba and other.All representatives of the sexual process, and there is no flagellate stage.
Rhode nostoc - Nostoc.These blue-green algae spread on the water plants in small size ponds, moist soil, included in the lichen.Power autotrophic them, it is to recycle organic inorganic substances.Reproduction occurs through spores or gormogoniev (multicellular fragments).These blue-green algae is used for human consumption and animals (water), and people.In Siberia and the European part of Russia lives Nostoc plum (edible).
representatives of this kind, as, indeed, most other blue-green algae form colonies.Colony - a cluster of individuals in very large numbers.All this is immersed in a cluster of mucous mass.
individual cells of algae collected in long chains.The number of basic cells are marked and colorless, larger intermediate.They perform a particular task at reproduction.Cells in the Nostoc filaments are separated all the time in half.Thus, the elongated chain and are generated from time to time, the border (intermediate cells).
mucus that surrounds the colony, has a special significance.So when come the adverse external conditions, such as dry pond slime dries, forming a "case."Wherein cells that are inside it, remain viable for a prolonged period, becoming resting spores which are immune or for drying or for cold.Upon the occurrence of the favorable conditions they continue to customary livelihoods.
Many of these blue-green algae can live on land.Their colonies are formed on the walls of houses, the bark of trees, in the body of other organisms (freshwater hydra, for example).
Rhode gloeotrichia - gleotrihiya.Quite common these blue-green algae in stagnant water bodies, they are also sometimes found in brackish and flowing waters.Representatives of this genus inhabit and aquatic plants, as well as live on the fallen leaves.Several different types of attached way of life, while others live freely in the water column.Eating these phototrophic algae is carried out.Reproduction occurs by means gormogoniev, can form spores.During the multiplication of algae in large quantities celebrated algal blooms.
Rhode anabaena - Annaba.This genus includes a fairly large number of species.These algae are common everywhere.They can be found in water bodies with a clay bottom, and in the lake prudnom plankton in the soil, in rain puddles.Eating these phototrophic algae.Reproduction of representatives of this kind carried out by gormogony.These algae bloom in the water provoking.It is found that the genus Anaba are capable of fixing atmospheric nitrogen.It is also known that certain types contain toxic compounds.
Rhode oscillatoria - oscillators.These algae are capable of forming a raid on an object at the bottom of reservoirs.Often the film oscillator can be seen on the water surface.Inhabit these algae standing water, wet walls, plankton, greenhouses and flower pots.Power phototrophic and reproduction - means gormogony.These algae are widespread and can be found in various regions of Russia.
