title: Euglenoid blooms in the floodplain wetlands of Barak Valley, Assam, North eastern India.
abstract: Red blooms of Euglena sp. in the floodplain wetland ecosystems of Barak Valley, Assam, India, were found to be induced by high concentrations of NH3-N, NO3, Fe, Mg and to some extent, PO4, Cu and Zn in their water. The trace elements were rapidly accumulated by the bloom organisms to high levels, whereby their concentrations in the water declined, leading to a collapse of the bloom, which tended to reappear as decomposition again led to the release of the nutrients. The bloom also harboured fairly high density of certain other algae and zooplankton, thereby acting as a sub-system within the wetland ecosystem. The bloom is non-toxic and is exploited as a fish food by the fish-farmers who artificially induce a bloom for augmenting the growth of surface-feeding species of fishes.
authors.affiliation: Dept of Ecology and Environmental Science, Assam University, Silchar-788 011, India.
authors.forename: S
authors.initials: S
authors.lastname: Duttagupta
authors.forename: Susmita
authors.initials: S
authors.lastname: Gupta
authors.forename: Abhik
authors.initials: A
authors.lastname: Gupta
mesh_terms: D000641:Ammonia / Q000032:analysis; D000818:Animals; D017753:Ecosystem; D004777:Environment; D005055:Euglena / Q000187:drug effects / Q000254:growth & development*; D056890:Eukaryota / Q000187:drug effects / Q000378:metabolism; D005247:Feeding Behavior; D005399:Fishes; D005618:Fresh Water / Q000382:microbiology*; D007194:India; D009566:Nitrates / Q000032:analysis; D010710:Phosphates / Q000032:analysis; D010839:Phytoplankton / Q000187:drug effects / Q000378:metabolism; D011156:Population Density; D014131:Trace Elements / Q000032:analysis / Q000633:toxicity; D014873:Water Pollutants / Q000032:analysis* / Q000633:toxicity; D015048:Zooplankton / Q000187:drug effects / Q000378:metabolism
chemical_list: D009566:Nitrates; D010710:Phosphates; D014131:Trace Elements; D014873:Water Pollutants; D000641:Ammonia