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USF St. Petersburg campus Faculty Publications
Sedimentary diatom concentrations and accumulation rates as predictors of lake trophic state.
Document Type
Article
Publication Date
1991
ISSN
1573-5117
Abstract
Diatom concentrations in surface sediments are positively correlated with limnetic chlorophyll a concentrations in Florida (USA) lakes. Using this relationship, I examine models that provide quantitative inferences for trophic state in historical applications.
The best model predicts chlorophyll a trophic state index (TSI) values from log-transformed diatom concentrations and explains approximately half the variance in the dependent variable. Diatom accumulation rates are not better than sedimentary diatom concentrations as predictors of TSI. The entire diatom assemblage is as sensitive an indicator of TSI as are the planktonic diatoms alone. A model that considers the ecological preferences of specific taxa was found to be a better predictor than the model based on total diatom concentration.
The sedimentary diatom concentration model provides a useful method for assessing historical changes in primary productivity, except in lakes where factors (e.g., silica limitation, blue-green bacterial inhibition) limited diatom production, or post-depositional changes removed sedimentary diatoms. TSI inferences are presented for sediment cores from two Florida lakes, one of which demonstrates a problematic application, and the other of which does not.
Publisher
Springer
Recommended Citation
Whitmore, T.J. (1991). Sedimentary diatom concentrations and accumulation rates as predictors of lake trophic state. Hydrobiologia, 214(1), 163-169. doi:10.1007/BF00050946.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Comments
Abstract only. Full-text article is available through licensed access provided by the publisher. Published in Hydrobiologia, 214(1), 163-169. doi:10.1007/BF00050946. Members of the USF System may access the full-text of the article through the authenticated link provided.