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Hydrobiologia

, Volume 661, Issue 1, pp 5–20 | Cite as

Hypolimnetic phosphorus and nitrogen dynamics in a small, eutrophic lake with a seasonally anoxic hypolimnion

  • Deniz ÖzkundakciEmail author
  • David P. Hamilton
  • Max M. Gibbs
LAKE RESTORATION

Abstract

In situ estimates of sediment nutrient flux are necessary to understand seasonal variations in internal loading in lakes. We investigated the sources and sinks of nutrients in the hypolimnion of a small (0.33 km2), relatively shallow (18 m max. depth), eutrophic lake (Lake Okaro, New Zealand) in order to determine changes in sediment nutrient fluxes resulting from a whole lake sediment capping trial using a modified zeolite phosphorus inactivation agent (Z2G1). Sediment nutrient fluxes in the hypolimnion were estimated as the residual term in a nutrient budget model that accounted for mineralisation of organic nutrients, nutrient uptake by phytoplankton and mixing, nitrification, adsorption/desorption and diffusion of dissolved nutrients at the thermocline. Of the total hypolimnetic phosphate and ammonium fluxes during one period of seasonal stratification (2007–08), up to 60 and 50%, respectively, were derived from the bottom sediments, 18 and 24% were due to mineralisation of organic species, 36 and 28% were due to phytoplankton uptake and 9 and 6% were from diffusion across the thermocline. Adsorption/desorption of phosphate to suspended solids and nitrification were of minor (<8%) importance to the total fluxes. Any reduction in sediment nutrient release by Z2G1 was small compared with both the total sediment nutrient flux and the sum of other hypolimnetic fluxes. Uneven sediment coverage of Z2G1 may have been responsible for the limited effect of the sediment capping layer formed by Z2G1.

Keywords

Eutrophication Lake Okaro Internal loading Lake restoration Sediment capping Mineralisation 

Notes

Acknowledgements

The first author was funded with a Ph.D. scholarship within the Lake Biodiversity Restoration program funded by the N.Z. Foundation of Research, Science and Technology (Contract UOWX 0505). We thank Dennis Trolle for assistance with the modelling and Michael Landman for helpful comments on an earlier manuscript draft. We gratefully acknowledge Environment Bay of Plenty and Scion (Rotorua) for additional funding. We are grateful to the two anonymous referees whose comments greatly improved the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Deniz Özkundakci
    • 1
    Email author
  • David P. Hamilton
    • 1
  • Max M. Gibbs
    • 2
  1. 1.Centre for Biodiversity and Ecology Research, University of WaikatoHamiltonNew Zealand
  2. 2.NIWA, National Institute of Water and Atmospheric Research LtdHamiltonNew Zealand

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