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Lake level and trophic state variables among a population of shallow Florida lakes and within individual lakes

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Monthly total phosphorus, total nitrogen, and chlorophyll concentrations, Secchi depth, and lake water level data for 84 Florida lakes were used to examine relations between trophic state variables and water level fluctuation. Lake size averaged 566 ha (range 4.0 to 5609 ha), with the period of record for individual lakes averaging 57 months (range 7 to 175 months). Lake level fluctuation for individual lakes averaged 1.3 m (range 0.1 to 3.5 m). The lakes also ranged from oligotrophic to hypereutrophic, with average chlorophyll values for individual lakes ranging from 1 to 97 µg·L–1. No overall relation between trophic state variables and lake level fluctuation could be found among the population of lakes. However, individual lakes showed direct, inverse, or no significant relations between lake trophic state variables and water level fluctuation, regardless of the magnitude of water level fluctuation. These data suggest that predicting how water level fluctuations will impact trophic state variables among a population of lakes will be difficult, if not impossible, and that any accurate predictions will have to be made after first examining several mechanisms within individual lake systems.

Les concentrations mensuelles de phosphore total, d'azote total et de chlorophylle, les profondeurs de Secchi et les données de niveau des eaux dans 84 lacs de Floride nous ont servi à examiner les relations entre les variables du niveau trophique et les fluctuations du niveau d'eau. Les lacs ont en moyenne 566 ha de surface (4,0 ha à 5609 ha); ils ont été suivis individuellement en moyenne pendant 57 mois (7 mois à 175 mois). Les fluctuations des niveaux des lacs individuels sont en moyenne de 1,3 m (0,1 m à 3,5 m). Les lacs varient aussi d'oligotrophes à hypereutrophes et les valeurs moyennes des concentrations de chlorophylle dans les lacs individuels vont de 1 µg·L–1 à 97 µg·L–1. Nous ne trouvons pas de relation globale entre les variables de l'état trophique et les fluctuations des niveaux des lacs dans cet ensemble de lacs. Cependant, dans les lacs individuels, il y a des relations positives, négatives et (ou) non significatives entre les variables de l'état trophique et les fluctuations du niveau de l'eau, indépendamment de l'importance de la fluctuation du niveau de l'eau. Ces données laissent croire qu'il est difficile, voire impossible, de prédire comment les fluctuations du niveau de l'eau vont affecter les variables de l'état trophique dans un ensemble de lacs et que toute prédiction précise ne pourra se faire avant d'avoir d'abord examiné plusieurs mécanismes dans des systèmes de lacs individuels. [Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2005

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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