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Sedimentary Cladoceran remains and their relationship to nutrients and other limnological variables in 53 lakes from British Columbia, Canada

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Abstract:

To develop models to predict past lake-water nutrient levels, the sedimentary remains of Cladocera were sampled from 53 lakes in central British Columbia, Canada. At the same time, the lakes were sampled for a suite of chemical variables. In addition, a host of physical and spatial explanatory variables were collected from each site. Canonical correspondence analysis showed that total phosphorus (TP), which ranged from 5 to 146 µg·L–1, was the measured environmental variable that best described the differences in species composition among the lakes. Additionally, lake depth and surface water temperature were also important in explaining the distribution of cladoceran taxa. Chydorus brevilabris, Daphnia ambigua, Daphnia cf. pulex, and Graptoleberis testudinaria had a preference for eutrophic lakes, whereas Acroperus harpae, Alonella nana, Alonella excisa, Chydorus piger, Daphnia cf. dentifera, and Eubosmina spp. were found in the less productive lakes. Predictive models to estimate TP from species abundance data were developed using weighted averaging techniques. This research has produced strong and significant inference models, which can now be used to reconstruct past changes in lake trophic status from remains of Cladocera in sediment cores.

Des prélèvements de restes de cladocères dans les sédiments de 53 lacs du centre de la Colombie Britannique, Canada, nous ont servi à mettre au point des modèles pour évaluer les concentrations passées des nutriments dans l'eau des lacs. Au même moment, nous avons aussi mesuré une série de variables chimiques et noté plusieurs variables explicatives physiques et spatiales à chacun des sites. Une analyse canonique des correspondances révèle que le phosphore total (TP), qui varie de 5 à 146 µg·L–1, est la variable environnementale mesurée qui explique le mieux les différences de composition en espèces entre les lacs; la profondeur du lac et la température de surface de l'eau sont aussi des facteurs explicatifs importants de la répartition des taxons de cladocères. Chydorus brevilabris, Daphnia ambigua, Daphnia cf. pulex et Graptoleberis testudinaria préfèrent les lacs eutrophes, alors que Acroperus harpae, Alonella nana, Alonella excisa, Chydorus piger, Daphnia cf. dentifera et Eubosmina spp. se retrouvent dans les lacs moins productifs. Nous avons développé des modèles prédictifs qui permettent d'estimer TP d'après l'abondance des espèces à l'aide de techniques des moyennes pondérées. Ces modèles d'inférence solides et significatifs peuvent servir à déterminer le statut trophique antérieur des lacs, à partir des restes de cladocères dans des carottes de sédiments.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-10-01

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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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