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Anabaena spiroides

caption Anabaena spiroides (Cyanobacteria, Nostocales). A filamentous, N-fixing cyanobacterium. Two heterocytes (cells in which N fixation takes place) are seen in this coiled chain as clear, lighter-colored cells, whereas the vegetative cells are darker with more texture, partly due to presence of aerotopes (gas vesicles). This species is rarely found in Lake Kinneret, more often in the littoral.
author aalster and tzohary
copyright A Alster & T Zohary, Kinneret Limnological Laboratory, IOLR
observation details click here
image notes Photo taken with an Olympus BX50 Microscope equipped with DIC optics and PixeLink digital camera, mag. X100
image sets   Lake Kinneret planktonic life forms