Response of heterotrophic bacteria, autotrophic picoplankton andheterotrophic nanoflagellates to re-oligotrophication

Kamjunke, Norbert; Straile, Dietmar; Gaedke, Ursula

Response of heterotrophic bacteria, autotrophic picoplankton andheterotrophic nanoflagellates to re-oligotrophication

Dateien

2009_Kamjunke_Straile_etal_Response_of_heterotrophic_bacteria.pdfGröße: 452.59 KBDownloads: 417

Datum

2009

Autor:innen

Kamjunke, Norbert

Straile, Dietmar

Gaedke, Ursula

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Plankton Research. 2009, 31(8), pp. 899-907. ISSN 0142-7873. eISSN 1464-3774. Available under: doi: 10.1093/plankt/fbp037

Zusammenfassung

We investigated the response of the microbial components of the pelagic food web to re-oligotrophication of large, deep Lake Constance where total phosphorus concentrations during mixing decreased from a maximum of 2.81 μmol L-1 in 1979 via 1.87 μmol L-1 in 1987 to 0.26 μmol L-1 in 2007. Measurements of heterotrophic bacteria, autotrophic picoplankton (APP) and heterotrophic nanoflagellates (HNF) in 2006 and 2007 were compared to values from 1987 to 1997. We hypothesized that the biomass and seasonal variability of all groups will decrease under more oligotrophic conditions due to reduced resource availability, particularly for APP and HNF but less for the competitively stronger bacteria. Average bacterial biomass between spring and autumn was unrelated to phosphorus, whereas the ratio of bacterial biomass to chlorophyll a concentration increased with decreasing trophy due to declining chlorophyll concentrations. In contrast, a unimodal relationship was found between APP and phosphorus with low biomass at low and high phosphorus concentrations and maximum biomass in between. Average HNF biomass decreased strongly by a factor of 10 30 with decreasing trophy, and chlorophyll-specific HNF biomass was unimodally related to phosphorus. The relative seasonal biomass variability did not change for any group during re-oligotrophication. To conclude, HNF responded much more strongly and bacteria less so than chlorophyll concentrations to oligotrophication, whereas APP exhibited a more complex pattern.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

Lake Constance, ologotrophication, microbial loop, plankton succession, bacteria, APP, HNF

Zitieren

ISO 690

KAMJUNKE, Norbert, Dietmar STRAILE, Ursula GAEDKE, 2009. Response of heterotrophic bacteria, autotrophic picoplankton andheterotrophic nanoflagellates to re-oligotrophication. In: Journal of Plankton Research. 2009, 31(8), pp. 899-907. ISSN 0142-7873. eISSN 1464-3774. Available under: doi: 10.1093/plankt/fbp037

BibTex

@article{Kamjunke2009Respo-6521,
  year={2009},
  doi={10.1093/plankt/fbp037},
  title={Response of heterotrophic bacteria, autotrophic picoplankton andheterotrophic nanoflagellates to re-oligotrophication},
  number={8},
  volume={31},
  issn={0142-7873},
  journal={Journal of Plankton Research},
  pages={899--907},
  author={Kamjunke, Norbert and Straile, Dietmar and Gaedke, Ursula}
}

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Universitätsbibliographie

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