Factors possibly affecting growth of Microcystis aeruginosa and M. flos aquae isolated from Wadi El-Raiyan Upper Lake Egypt under laboratory conditions | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Article 4, Volume 16, Issue 2, May 2012, Pages 35-46 PDF (290.66 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2012.2123 | ||
| Authors | ||
| Hoda Nasr1; Shymaa Zaher1; Ahmed El-Awamri2 | ||
| 1National Institute of Oceanography and Fisheries, Inland Water Branch, Hydrobiology | ||
| 2Botany Dept., Faculty of Science, Ain Shams Univ., Cairo, Egypt | ||
| Abstract | ||
| Experiments were carried out to determine the effects of some environmental factors causing the phenomenon of algal blooming in the upper lake of Wadi El-Raiyan under laboratory conditions. Microcystis aeruginosa and M. flos aquae were isolated from Wadi El-Raiyan Lakes. Mono-clonal culture of each species was kept in 100-ml BG11 media in the laboratory for 5 days. The algal growth was measured by the determination of chlorophyll a and cell count to understand the succession patterns of both species in relation to the tested environmental conditions. The best photoperiod cycle was found to be (14:10 hrs) and the growth of the two species increased with increasing light intensities up to 45μ E m -2 s -1. Salinity and the growth of tested species exhibited a significant inverse relationship, increased salinity inhibiting algal growth. Water pH range from 7 to11 was suitable for growth of both species, while a pH below or above this range caused a significant decrease in growth. High nitrogen sources entering into Wadi El-Raiyan Lake may be one of the reasons for the blooming of the tested microalgae. The toxic effects of the bloom-forming species impact the economic fish resources of the lake leading to fish kills. | ||
| Keywords | ||
| Microcystis aeruginosa; Microcystis flos aquae; Wadi El-Raiyan; Photoperiod; salinity; pH | ||
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