Affiliations: Department of Environmental Sciences, M.L.Sukhadia
University, Udaipur-313001, India | Department of Botany, G.N.Girls College,
Udaipur-313002, India
Note: [] Corresponding author
Abstract: The cyanobacteria and physico-chemical environments of six tropical
fresh water lakes of Udaipur, India were investigated. These lakes receive
varying nutrient inputs from different sources. Altogether 51 species of
cyanobacteria were recorded. Species composition varied between lakes and
between seasons. Lake VI (Baghdara), which receives nutrients from natural
sources only, differed considerably from the others in water chemistry and
composition of dominant species. Lake II (Swaroop Sagar), eutrophied due to
sewage inputs, was species poor. Non-diazotrophs, represented by 27 species,
dominated during summer. With few exceptions, N_2-fixing species, both
heterocystous and unicellular diazotrophs (represented by 24 species), were
dominant during winter. Microcystis aeruginosa, Phormidium sp. and Anabaena
flos-aque were the dominant taxa of lakes characterized by sewage
eutrophication. The study shows that both, species diversity and community
composition were affected by water chemistry.
Keywords: species diversity, eutrophication, Cyanobacteria
