23
2 Eutrophication: Global Scenario and Local Threat to Dynamics of Aquatic Ecosystems
was very low and average temperature and pH were very
high (Table 2). The duckweeds in these two summer months
did not survive. It is likely that reduction in area, depth and
volume of water body in the summer may have increased
turbidity and nutrient concentrations in the water body. The
nutrients bound in the plants were released after decay of
duckweeds and advected to upper surface in summer. High
pH, nutrient, turbidity and temperature were feasibly far
above the optimum requirement of the duckweeds and may
have increased their mortality. In microcosm experiments,
Fig. 2.1 Population of Eichornia crassipes on eastern side of the pond
(a), Blooming of duckweeds ( Lemna and Spirodela) in the open part
of western side (b), Duckweeds in the drying stage (c), Algal bloom in
small patches (d), Eichornia crassipes and Paspalum paspaloides (e),
Dried part of the pond in May 2004 (f)
2 Eutrophication: Global Scenario and Local Threat to Dynamics of Aquatic Ecosystems
was very low and average temperature and pH were very
high (Table 2). The duckweeds in these two summer months
did not survive. It is likely that reduction in area, depth and
volume of water body in the summer may have increased
turbidity and nutrient concentrations in the water body. The
nutrients bound in the plants were released after decay of
duckweeds and advected to upper surface in summer. High
pH, nutrient, turbidity and temperature were feasibly far
above the optimum requirement of the duckweeds and may
have increased their mortality. In microcosm experiments,
Fig. 2.1 Population of Eichornia crassipes on eastern side of the pond
(a), Blooming of duckweeds ( Lemna and Spirodela) in the open part
of western side (b), Duckweeds in the drying stage (c), Algal bloom in
small patches (d), Eichornia crassipes and Paspalum paspaloides (e),
Dried part of the pond in May 2004 (f)