Bacterioplankton Activity in a Meso-eutrophic Subtropical Coastal Lagoon
Type | Article | ||||||||
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Date | 2018-10 | ||||||||
Language | English | ||||||||
Author(s) | Schmitz Fontes Maria L.1, 2, Fernandes Heloísa3, Brandão Manoela1, Hennemann Mariana Coutinho1, Aparecida Loss Raquel4, de Souza Grinevicius Valdelúcia Maria Alves5, Tonetta Denise1, Cesca Karina4, Hessel Silveira Mônica1, Bedin Mara1, Recouvreux Derce4, Vasconcellos Antônio Regina6 | ||||||||
Affiliation(s) | 1 : Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil 2 : PPGOCEANO, Departamento de Geociências, Centro de Filosofia e Ciências Humanas, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil 3 : Departamento de Engenharia Sanitária, Centro Tecnológico, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil 4 : Departamento de Engenharia Química e Engenharia de Alimentos, Centro Tecnológico, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil 5 : Departamento deBioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil 6 : Campus Araranguá, Universidade Federal de Santa Catarina, Trindade, 88000-000 Araranguá, SC, Brazil |
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Source | International Journal of Microbiology (1687-918X) (Hindawi Limited), 2018-10 , Vol. 2018https://w3. , N. 3209605 , P. 8p. | ||||||||
DOI | 10.1155/2018/3209605 | ||||||||
Abstract | The aim of this study was to investigate whether the bacterioplankton activity in the meso-eutrophic Conceição Lagoon would increase significantly under allochthonous inputs of inorganic nutrients and organic carbon. Abundance and biomass of bacterioplankton were evaluated under three treatments: light (14 h light/10 h dark), complete darkness (dark-control), and nutrient (C + N + P—dark, 100 : 10 : 1) enrichments during 72 h. Nutrient enrichments promoted a significant increase in abundance (maximum of 19.0 ×109 cells·L−1 in the first 32 hours) and biomass of the heterotrophic bacterioplankton, which induced the formation of large clusters. Bacterial biomass remained constant in the non-enriched incubations (dark-control and light). Bacterial growth rates were significantly higher after nutrient additions (1.35 d−1), followed by control (0.79 d−1), and light (0.63 d−1) treatments, which were statistically equal (). Bacterial production rates were also significantly higher under nutrient additions (1.28 d−1), compared to the control and light (0.50 d−1 and 0.44 d−1, respectively), demonstrating that bacterial growth and production in this meso-eutrophic lagoon are under an immediate “bottom-up” regulation, followed by a potential top-down effect. These facts reinforce the urgency on improving the local wastewater management plan in order to prevent further expansion of anoxic waters. |
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