Freshwater-microalgae

 Microalgae or microphytes are microscopic algae, classically found in freshwater and marine systems, living in both the water column and residue.They are unicellular species which exist independently, or in chains or groups. Dependent on the species, their sizes can range from a few micrometers (μm) to a few hundred micrometers. Different higher plants, microalgae do not have roots, stems, or leaves. They are specially altered to an environment dominated by viscous forces. Microalgae, proficient of performing photosynthesis, are important for life on earth; they produce around half of the atmospheric oxygen and use concurrently the greenhouse gas carbon dioxide to grow photoautotrophically. Microalgae, together with bacteria, system the base of the food web and afford energy for all the trophic stages above them. Microalgae biomass is often measured with chlorophyll a concentrations and can afford a useful index of potential production. The standing stock of microphytes is carefully related to that of its predators.  

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