Planktonic nutrient regeneration and cycling efficiency in temperate lakes

Jeff J. Hudson (), William D. Taylor and David W. Schindler
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Jeff J. Hudson: University of Alberta
William D. Taylor: University of Waterloo
David W. Schindler: University of Alberta

Nature, 1999, vol. 400, issue 6745, 659-661

Abstract: Abstract Planktonic nutrient regeneration is a fundamental process that maintains most of the primary productivity in marine and freshwater environments. However, there is no robust predictive model to describe the pattern and efficiency of nutrient cycling across aquatic systems. Based on rather weak evidence, the efficiency of nutrient regeneration is believed to decline along a gradient of productivity, so that nutrient-poor environments are assumed to be more efficient at cycling their nutrients than are nutrient-rich environments1,2,3,4,5. Here we measure phosphorus regeneration directly and show that cycling efficiency does not vary with phosphorus concentration. In addition, we confirm that the phosphorus supply for lake plankton comes primarily from within the plankton community, rather than from external loading or from larger organisms such as fish.

Date: 1999
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DOI: 10.1038/23240

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