title: Freshwater algae competition and correlation between their growth and microcystin production.
abstract: There are some different freshwater algae in Eutrophic reservoirs which bloom with specific environmental conditions, and some of them are cyanobacteria. In this investigation, we have cultivated microalgae present in natural water samples from a eutrophic reservoir. Variations in temperature and light were evaluated, as well as the competition among different green algae and cyanobacteria. There were three different freshwater algae growing together, Scenedesmus sp., Kirchneriella sp. and Microcystis aeruginosa, this cyanobacterium was the algae that reached the highest development and growth during the culture. While the algae grew, the concentration of toxin (microcystin-LR) increased until it reached the highest levels at 570 μg g-1. Blooms occurred at temperatures of 28 ± 1.5 °C and light cycles of longer hours of light than dark. This took place during the summer months, from June to September (in the study area). At temperatures below 18 °C, algae did not grow. Blooms were reproduced to a laboratory scale in different conditions in order to understand the development of freshwater algae, as well as to help decision-making about water supply from that reservoir.
authors: Engineering Department of Natural Resources and Environment, E.I. Forestal, University of Vigo, Campus A Xunqueira s/n, 36005, Pontevedra, Spain. giaf4_5@uvigo.es.
authors: Xana
authors: X
authors: Álvarez
authors: Engineering Department of Natural Resources and Environment, E.I. Forestal, University of Vigo, Campus A Xunqueira s/n, 36005, Pontevedra, Spain.
authors: Enrique
authors: E
authors: Valero
authors: Chemical Engineering Department, Industrial Engineering College, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Pontevedra, Spain.
authors: Ángeles
authors: Á
authors: Cancela
authors: Chemical Engineering Department, Industrial Engineering College, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Pontevedra, Spain.
authors: Ángel
authors: Á
authors: Sánchez
mesh_terms: D000460:Chlorophyta; D000458:Cyanobacteria / Q000254:growth & development; D017753:Ecosystem; D005068:Eutrophication; D005618:Fresh Water; D008387:Marine Toxins; D052998:Microcystins / Q000032:analysis / Q000378:metabolism*; D046931:Microcystis / Q000254:growth & development* / Q000378:metabolism; D017440:Photoperiod; D044444:Scenedesmus / Q000254:growth & development*; D012621:Seasons; D013696:Temperature; D014881:Water Supply
chemical_list: D008387:Marine Toxins; D052998:Microcystins; C078588:microcystin; C057862:cyanoginosin LR
keywords: Cyanobacteria; Kirchneriella sp.; Microcystin-LR; Microcystis aeruginosa; Scenedesmus sp.