Biotic and Abiotic Factors Affecting the Population Dynamics of <i>Ceratium</i> <i>hirundinella</i>, <i>Peridinium</i> <i>cinctum</i>, and <i>Peridiniopsis</i> <i>elpatiewskyi</i>
2019
Behrouz Zarei Darki | Alexandr F. Krakhmalnyi
The present research was conducted to assess the impact of abiotic and biotic factors on the growth of freshwater dinoflagellates such as <i>Ceratium hirundinella</i>, <i>Peridinium cinctum</i>, and <i>Peridiniopsis elpatiewskyi</i>, which reduce the quality of drinking water in the Zayandeh Rud Reservoir. To this end, 152 algal and zoological samples were collected from the reservoir located in the Central part of Iran in January, April, July, and October 2011. Abiotic factors such as pH, temperature, conductivity, transparency, dissolved oxygen, and nutrient concentration of the water were measured in all study stations. The results showed that the population dynamics of dinoflagellates in the Zayandeh Rud Reservoir was different depending on season, station, and depth. The findings proved that <i>C. hirundinella</i> was one of the dominant autumn planktons in the highest biovolume in the Zayandeh Rud Reservoir. While <i>P. elpatiewskyi</i> was present in the reservoir throughout a year with biovolume peak in summer. Accompanying bloom of <i>P. elpatiewskyi</i> and <i>C. hirundinella</i>, <i>P. cinctum</i> also grew in well-heated summer and autumn waters. It was further found that <i>Ceratium</i> density was positively correlated with sulfate ion concentrations, while the growth of <i>P. cinctum</i> and <i>P. elpatiewskyi</i> were associated, first and foremost, with NO<sub>2</sub><sup>−</sup> and Mn.
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