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Hydrobiologia

, Volume 644, Issue 1, pp 279–287 | Cite as

Long-term trends of epilimnetic and hypolimnetic bacteria and organic carbon in a deep holo-oligomictic lake

  • Roberto BertoniEmail author
  • Cristiana Callieri
  • Gianluca Corno
  • Serena Rasconi
  • Emanuele Caravati
  • Mario Contesini
Primary research paper

Abstract

We analysed the long-term dynamics (1980–2007) of hypolimnetic and epilimnetic bacterial abundances and organic carbon concentrations, both dissolved (DOC) and particulate (POC), in the deep holo-oligomictic Lake Maggiore, included in the Southern Alpine Lakes Long-Term Ecological Research (LTER) site. During the 28 years of investigation, bacterial abundance and POC concentrations did not decrease with declining phosphorus concentrations, while DOC concentrations showed a pronounced decrease in the epi- and hypolimnion. We used the annual mean total lake heat content and total annual precipitation as climate-related variables, and in-lake total phosphorus as a proxy for trophic state. The model (forward stepwise regression, FSR) showed that reduced anthropogenic pressure was more significant than climate change in driving the trend in DOC concentrations. Bacterial dynamics in the hypolimnion mirrored the fluctuations observed in the epilimnion, but average cell abundance was three times lower. The FSR model indicates that bacterial number variability was dependent on POC in the epilimnion and DOC in the hypolimnion. In the hypolimnion, cell biovolumes for rod and coccal morphotypes were significantly larger than in the epilimnion.

Keywords

Long-term dynamics DOC and POC Bacteria Cell biovolume Chlorophyll a Holo-oligomictic Lake Maggiore 

Notes

Acknowledgements

Some of the data presented came from research on Lake Maggiore supported by the International Commission for the Protection of Italian-Swiss Waters (CIPAIS). We are indebted to Michela Rogora for assistance during statistical analyses of long-term data and for providing data on phosphorus; and to Walter Ambrosetti, who provided data on the heat content of the lake and on annual precipitation.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Roberto Bertoni
    • 1
    Email author
  • Cristiana Callieri
    • 1
  • Gianluca Corno
    • 1
    • 2
  • Serena Rasconi
    • 3
  • Emanuele Caravati
    • 1
  • Mario Contesini
    • 1
  1. 1.CNR - Institute of Ecosystem StudyVerbania PallanzaItaly
  2. 2.Limnological Station, Institute of Plant BiologyUniversity of ZurichKilchbergSwitzerland
  3. 3.UMR CNRS 6023, Université B. PascalClermont FerrandFrance

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