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Driving factors affecting spatial and temporal variations in the structure of phytoplankton functional groups in a temperate reservoir

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2015
Authors
Ćirić, Miloš
Gavrilović, Bojan
Subakov-Simić, Gordana
Krizmanić, Jelena
Vidović, Milka
Zebic, Goran
Article (Published version)
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Abstract
During the twenty-five years of existence, water quality has declined and severe blooms of cyanobacteria have occurred in the Grliste Reservoir. Changes in phytoplankton functional groups over time and along horizontal and vertical gradients were investigated in the course of a one-year study in this water-supply reservoir. We identified 19 dominant taxa, classified into 12 phytoplankton associations. The presence of the codons C, P, D and S1 differentiated the transitional from the lacustrine part of the reservoir. The nitrogen-fixing cyanobacteria Dolichospermum viguieri dominated the phytoplankton community in the epilimnion during August and September, when the reservoir showed P-limitation, but the bloom was not observed. The driving factors that accounted for the main variability in phytoplankton functional groups along the seasonal and vertical profile were identified using the direct gradient analysis (RDA). Our results revealed the importance of two bipolar factors. The first ...factor explained the variability in phytoplankton due to thermal stratification and physical mixing, each process affecting the algal community in contrasting ways. The second factor was interpreted as reduction vs. oxidation processes. Positive correlation between stratification and water pumping by a drinking water plant indicated that human activities were not severe enough to break down the thermal stability of the reservoir and to cause a cyanobacterial bloom.

Keywords:
cyanobacteria / drinking water plant / functional groups / phytoplankton / reservoir
Source:
Oceanological and Hydrobiological Studies, 2015, 44, 4, 431-444
Publisher:
  • Walter De Gruyter Gmbh, Berlin
Projects:
  • Geologic and ecotoxicologic research in identification of geopathogen zones of toxic elements in drinking water reservoirs- research into methods and procedures for reduction of biochemical anomalies (RS-176018)

DOI: 10.1515/ohs-2015-0041

ISSN: 1730-413X

WoS: 000368444900001

Scopus: 2-s2.0-84950150965
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1649
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