Special issue on restoration of aquatic ecosystems

Quinn, John M.

doi:10.1080/00288330909510031

Cited by 4 publications

(1 citation statement)

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“…Steps are beginning to be taken to redress the decline in water quality, including changing land use around some lakes (Quinn 2009). Amongst the Te Arawa lakes, there has been an intensive restoration programme in Lake Okaro, the focal lake in this study, which commenced in 2003.…”

Section: Introductionmentioning

confidence: 99%

Modelling the response of a highly eutrophic lake to reductions in external and internal nutrient loading

Özkundakci

Hamilton

Trolle

2011

New Zealand Journal of Marine and Freshwater Research

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The reduction of macronutrients to levels that limit primary production is often a critical element of mitigating eutrophication and reducing the potential for algal blooms. Lake Okaro has remained highly eutrophic despite an intensive catchment and in-lake restoration programme, including implementation of a constructed wetland, riparian protection, an alum application and application of a modified zeolite mineral (Z2G1) to reduce internal nutrient loading. A onedimensional process-based ecosystem model (DYRESM-CAEDYM) was used in this study to investigate the need for further nutrient loading reductions of both nitrogen (N) and phosphorus (P). The model was calibrated against field data for a 2-year period and validated over two separate 1-year periods. Model simulations suggest that the trophic status of the lake, measured quantitatively with the Trophic Level Index (TLI), could shift from highly eutrophic to mesotrophic with external and internal loads of both N and P reduced by 75Á90%. The magnitude of the nutrient load reductions is indicative of a major challenge in being able to effect transitions across trophic state categories for eutrophic lakes.

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Section: Introductionmentioning

confidence: 99%