Abstract. Many human activities in the margin of Choghakhor wetland, (Iran) causes evaluation of the
phytoplankton status in relation to the physico-chemical parameters in different seasons of 2011 in 5
marginal stations of the wetland. Water samples prepared in triplicate and temperature, pH, dissolved
oxygen, nitrate and phosphate concentration were measured using APHA methods. The phytoplankton
identified, counted and Shannon diversity index (Hʹ). Phytoplankton community included 59 genera, 43
families and 6 divisions, among which Bacillariophyta was the most common (46.6%) followed by
Chlorophyta (32.0%), Cyanophyta (13.3%), Dinophyta (4.4%), Euglenophyta (3.0%) and Chrysophyta
(0.8%). Phytoplankton density, nitrate, and phosphate concentration were different in different stations
and seasons (P < 0.05). The highest density was recorded for Nitzschia followed by Cosmarium,
Microcystis, Peridinium, Euglenaria and Dinobryon. Also, Microcystis density was maximum in station 5
[S5]. There were significant correlations between the phytoplankton density and nitrate concentration
(r = 0.6, P < 0.01), Chlorophyta and phosphate concentration (r = 0.3, P < 0.01), Cyanophyta and
phosphate concentration (r = 0.2, P < 0.05). Although wetland water was still clean (Hʹ > 3), high density
of Nitzschia and Microcystis as eutrophication bio-indicators showed starting of eutrophication.
Microcystis as the most abundant genus of Cyanophyta must be seriously controlled to avoid blooms in
the wetland.
Keywords: phytoplankton composition, physico-chemical parameters, Choghakhor wetland, nitrate,

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