TY - JOUR T1 - Bacterioplankton Activity in a Meso-eutrophic Subtropical Coastal Lagoon A1 - Schmitz Fontes,Maria L. A1 - Fernandes,Heloísa A1 - Brandão,Manoela A1 - Hennemann,Mariana Coutinho A1 - Aparecida Loss,Raquel A1 - de Souza Grinevicius,Valdelúcia Maria Alves A1 - Tonetta,Denise A1 - Cesca,Karina A1 - Hessel Silveira,Mônica A1 - Bedin,Mara A1 - Recouvreux,Derce A1 - Vasconcellos Antônio,Regina AD - Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil AD - PPGOCEANO, Departamento de Geociências, Centro de Filosofia e Ciências Humanas, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil AD - Departamento de Engenharia Sanitária, Centro Tecnológico, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil AD - Departamento de Engenharia Química e Engenharia de Alimentos, Centro Tecnológico, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil AD - Departamento deBioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, 88040-970 Florianópolis, SC, Brazil AD - Campus Araranguá, Universidade Federal de Santa Catarina, Trindade, 88000-000 Araranguá, SC, Brazil UR - https://archimer.ifremer.fr/doc/00597/70922/ DO - 10.1155/2018/3209605 N2 - 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. Y1 - 2018/10 PB - Hindawi Limited JF - International Journal of Microbiology SN - 1687-918X VL - 2018https://w3. IS - 3209605 ID - 70922 ER -