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Nutrient ratios, differential retention, and the effect on nutrient limitation in a deep oligotrophic lake

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Abstract

Nutrient ratios have been related to nutrient limitation of algal growth in lakes. Retention of nutrients in lakes, by sedimentation and by denitrification, reduces the nutrient concentrations in the water column, thereby enhancing nutrient limitation. Differential retention of nitrogen and phosphorus alters their ratios in lakes and thereby contributes to determine whether nitrogen or phosphorus limits algal growth. We examined the relationships between differential nutrient retention, nutrient ratios, and nutrient limitation in Lake Brunner, a deep oligotrophic lake. The observed retention of nitrogen (20%) and phosphorus (47%) agreed with predictions by empirical equations from literature. As a result of differential retention with a much larger proportion of phosphorus retained than that of nitrogen, the nitrogen:phosphorus ratio was higher in the lake (69) than in the inflows (46). While the mean ratio in the inflows suggested no or only moderate phosphorus limitation, the lake appeared to be severely phosphorus limited. Combining empirical equations from literature that predict nitrogen and phosphorus retention suggests that the nitrogen:phosphorus ratio is enhanced by greater retention of phosphorus compared to nitrogen only in deep lakes with relatively short residence times, such as Lake Brunner. In contrast, in most lakes differential retention is expected to result in lower nitrogen:phosphorus ratios.

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Acknowledgments

This study was funded by two Envirolink Grants from the Ministry of Environment (748-WCRC66 and 886-WCRC776) and by Ministry of Business, Innovation and Employment (MOBIE) program C01X1005. We thank Brent Beadle, Jack Grinstead, Casey Beel, and Steffi Henkel for help with data collection. Water samples were analyzed by NIWA water quality laboratory in Christchurch until 2006 and by NIWA Hamilton since then.

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Correspondence to P. Verburg.

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Verburg, P., Horrox, J., Chaney, E. et al. Nutrient ratios, differential retention, and the effect on nutrient limitation in a deep oligotrophic lake. Hydrobiologia 718, 119–130 (2013). https://doi.org/10.1007/s10750-013-1609-3

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  • DOI: https://doi.org/10.1007/s10750-013-1609-3

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