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Intra-habitat heterogeneity of microbial food web structure under the regime of eutrophication and sediment resuspension in the large subtropical shallow Lake Taihu, China

  • Qinglong L. WuEmail author
  • Yuwei Chen
  • Kuidong Xu
  • Zhengwen Liu
  • Martin W. Hahn
Part of the Developments in Hydrobiology book series (DIHY, volume 194)

Abstract

Planktonic microbial community structure and classical food web were investigated in the large shallow eutrophic Lake Taihu (2338 km2, mean depth 1.9 m) located in subtropical Southeast China. The water column of the lake was sampled biweekly at two sites located 22 km apart over a period of twelve month. Site 1 is under the regime of heavy eutrophication while Site 2 is governed by wind-driven sediment resuspension. Within-lake comparison indicates that phosphorus enrichment resulted in increased abundance of microbial components. However, the coupling between total phosphorus and abundance of microbial components was different between the two sites. Much stronger coupling was observed at Site 1 than at Site 2. The weak coupling at Site 2 was mainly caused by strong sediment resuspension, which limited growth of phytoplankton and, consequently, growth of bacterioplankton and other microbial components. High percentages of attached bacteria, which were strongly correlated with the biomass of phytoplankton, especially Microcystis spp., were found at Site 1 during summer and early autumn, but no such correlation was observed at Site 2. This potentially leads to differences in carbon flow through microbial food web at different locations. Overall, significant heterogeneity of microbial food web structure between the two sites was observed. Site-specific differences in nutrient enrichment (i.e. nitrogen and phosphorus) and sediment resuspension were identified as driving forces of the observed intra-habitat differences in food web structure.

Keywords

Microbial food web Eutrophication Resuspension Shallow lake Heterogeneity 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Qinglong L. Wu
    • 1
    • 2
    Email author
  • Yuwei Chen
    • 1
  • Kuidong Xu
    • 3
  • Zhengwen Liu
    • 1
    • 4
  • Martin W. Hahn
    • 2
  1. 1.Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjingP.R. China
  2. 2.Institute for LimnologyAustrian Academy of SciencesMondseeAustria
  3. 3.Institute of OceanographyChinese Academy of SciencesQingdaoP.R. China
  4. 4.Institute of HydrobiologyJinan UniversityGuangzhouP.R. China

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