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Cylindrospermopsis raciborskii

caption Cylindrospermopsis raciborskii was the second N2-fixing filamentous cyanobacterium that invaded Lake Kinneret. It was first observed in 2000 and by 2005 has replaced A. ovalisporum as the dominant N2 fixer in summer-fall. The thin (1.5 - 3 um), delicate filaments of this species are characterized by drop-shaped heterocytes, and when they don\'t appear, pointed terminal cells. In summer 2005 this species formed a massive bloom with > 30,000 filaments/mL.
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. X40
image sets   Lake Kinneret planktonic life forms