The effects of nutrient, pH and herbicide levels on algal growth

Differential Effects of Thiobencarb Toxicity on Growth and Photosynthesis of Anabaena variabilis with Changes in Phosphate Level

“…There were no di!erences in growth of A. variabilis (control set) when treated with di!erent levels of phosphate. These "ndings are in agreement with results obtained by Tubea et al (1981).…”

“…Ryan et al (1972) found that increased levels of dissolved nutrients can change the aquatic ecosystem by stimulating algal growth. Many studies concerning the toxic e!ects of pesticides in the presence of various levels of nutrients in culture media have been conducted (Tubea et al, 1981;Kashyap and Pandey, 1982;Harrison et al, 1990;Mohapatra and Mohanty, 1992). Corbett et al (1984) and Tomlin (1994), reported that thiobencarb herbicide inhibited protein synthesis, which in turn can exert many secondary e!ects on growth.…”

Effect of Pendimethalin on Growth and Photosynthetic Activity of Protosiphon botryoides in Different Nutrient States

“…These data are contrary to those reported by Tubea et al (1981), who found that the toxicity of herbicides to N. muscorum was reduced when the alga was provided with higher doses of phosphate or nitrate. On the other hand, gross photosynthesis and dark respiration decreased when high nitrate levels interacted with high pendimethalin concentration, indicating that there is a correlation between biomass yield of Protosiphon and its photosynthetic activity, which con-"rms the "ndings El-Sheekh et al (1994) and contradicts those of Stratton (1984), who reported that no correlation appears to exist between photosynthetic activity and growth patterns.…”

“…There are some reports related to the toxic e!ects of herbicides and pesticides in the presence of various levels of nutrients in culture medium (Tubea et al, 1981;Singh et al, 1983;Pandey et al, 1984;Mishra and Pandey, 1989;Mohapatra and Mohanty, 1992). The aim of the present study was to investigate the toxicity of pendimethalin to growth and photosynthesis of the green alga Protosiphon botryoides and the e!ect of nitrate and phosphate nutrients on herbicide toxicity.…”

The Influence of the Zebra Mussel (Dreisena Polymorhpa) on Magnesium and Calcium Concentration in Water

“…Although, magnesium is not considered a pollutant, reduction of excessive Mg input to water bodies may be important for water quality, because magnesium, a main component of chlorophyll, has a stimulating effect on algal and cyanobacterial growth (e.g. TUBEA et al 1981;UTKILEN 1982). However, magnesium may be only one of the factors contributing to algal blooms -the most important seem to be nitrogen and phosphorus, both of which amplify the symptoms of eutrophication.…”