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- Title
The influence of calcium on the chlorophyll-phosphorus relationship and lake Secchi depths.
- Authors
Håkanson, Lars; Blenckner, Thorsten; Bryhn, Andreas C.; Hellström, Sara-Sofia
- Abstract
The basic aim of this study was to analyse the influence of calcium on the Chl-TP relationship and to apply the findings to improve dynamic (mechanistically-based) modelling of phosphorus and lake eutrophication. We have analysed long-term data from 73 lakes. The influences of calcium found in these statistical analyses have been integrated into a dynamic foodweb model, the LakeWeb-model, which also includes a mass-balance model for phosphorus. Differences in the model outcome between simulations without and with considerations to the role of calcium are discussed. We can conclude that calcium is an important factor influencing both the Chl-TP relationship and Secchi depths in mesotrophic and eutrophic lakes. Our results also indicate that lakes with long-term median Ca-concentration between 10-30?mg/l function as hardwater lakes. The results also stress the importance of taking a holistic view of lakes since the bedrock, soils and land-use activities in the catchment influence the calcium concentration in lakes and therefore the phosphorus cycle, water clarity and the productivity of a given lake. The predictive power of the Chl-TP regression increases markedly if hardwater lakes are omitted from the model domain. For lake foodweb and mass-balance modelling, we show that the inclusion of the presented calcium moderator clearly improved the predictions of lake TP-concentrations in water and sediments, chlorophyll and Secchi depths in Lake Erken, a hardwater lake in Sweden.
- Subjects
FISHES; CALCIUM; RADIOACTIVE pollution of water; LAKE restoration; CHLOROPLAST pigments; TETRAPYRROLES
- Publication
Hydrobiologia, 2005, Vol 537, Issue 1-3, p111
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-004-2605-4