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Limnology

, Volume 16, Issue 3, pp 193–201 | Cite as

Linking summer conditions to CO2 undersaturation and CO2 influx in a subtropical coastal lake

  • Denise Tonetta
  • Maria Luiza S. Fontes
  • Mauricio Mello Petrucio
Research paper

Abstract

In this study, we tested the hypothesis that pCO2 and air–water CO2 fluxes in the surface waters of a subtropical lake vary on two time scales (diel and seasonally) and that CO2 concentrations would decrease during the day and in summer. We estimated the variability of pCO2 and the air–water CO2 flux from pH-alkalinity in four 48-h periods that were representative of each subtropical season. There was high variability in pCO2 and the air–water gas flux over 48 h, but there was no clear pattern between day and night. CO2 concentrations showed a strong positive correlation with heterotrophic bacterial biomass and a negative correlation with dissolved organic carbon concentrations and water temperature. The lake was predominantly diel and seasonally CO2 supersaturated; the highest CO2 efflux was observed in the spring and a CO2 influx was observed in summer. Our hypothesis was confirmed; pCO2 was lowest in summer and during the daytime in spring and summer due to physical and biological conditions that favoured photosynthetic activities. These findings suggest that temporal shifts in the microbial community and meteorological variables, which are indirectly related to temperature, may be important drivers of CO2 concentrations in Peri Lake. In conclusion, pCO2 and the air–water CO2 flux vary temporally (diel and seasonally) in the littoral zone of this subtropical coastal lake, with shifts between CO2 influx and efflux throughout the sampling periods.

Keywords

Bacterioplankton Gaseous exchanges Metabolism Heterotrophy 

Notes

Acknowledgments

We thank all of the reviewers whose suggestions greatly improved this manuscript. We also would like to thank Alex Pires De Oliveira Nuñer (LAPAD—UFSC) and Danilo Funke (FLORAM—Parque Municipal da Lagoa do Peri) for provision of lab and field equipment and the PPGECO—UFSC (Programa de Pós-graduação em Ecologia). This study was funded by CNPq—Brazil (Conselho Nacional de Desenvolvimento Científico e Tecnológico; Universal Process: 473572/2008-7) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).

Supplementary material

10201_2015_460_MOESM1_ESM.docx (16 kb)
Supplementary material 1 (DOCX 16 kb)

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Copyright information

© The Japanese Society of Limnology 2015

Authors and Affiliations

  • Denise Tonetta
    • 1
  • Maria Luiza S. Fontes
    • 2
  • Mauricio Mello Petrucio
    • 1
  1. 1.Laboratory of Freshwater EcologyFederal University of Santa CatarinaFlorianópolisBrazil
  2. 2.Plant Functional Biology and Climate Change Cluster, School of the EnvironmentUniversity of Technology SydneySydneyAustralia

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