Cyanobacteria from two subtropical water bodies in southernmost Brazil
Keywords:
artificial pond, environmental conditions, marsh, taxonomyAbstract
The research aimed to study the cyanobacterial flora of an artificial pond and marsh at the Lutheran University of Brazil (Canoas, Rio Grande do Sul State), while understanding the distribution and environmental conditions where these species occur. Samples were collected monthly between November 2009 and October 2010. Twentyfour species were identified, highlighting the colonial forms (50%), with the predominance of the order Chroococcales (67%). The identified filamentous cyanobacteria belonged to Oscillatoriales (25%), Nostocales (17%) and Pseudanabaenales (8%). Out of all the identified species, only six [Microcystis aeruginosa (Kützing) Kützing M. wesenbergi (Komárek) Komárek, Oscillatoria curviceps Agardh ex Gomont, O. tenuis Agardh ex Gomont, Cuspidothrix issatschenkoi (Usačev) Rajaniemi et al. and Cylindrospermopsis raciborskii (Woloszynska) Seenayya & Subba Raju] were observed in both analyzed water bodies. Over the study period, Cylindrospermopsis raciborskii blooms occurred in the pond, while blooms of Microcystis aeruginosa were observed in the marsh in spring and summer.
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