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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 8 | PAGES 1527-1538 | 1998
© Oxford University Press

research-article

Experiments on nutrient limitation in bottles

D.H. Cushing and J.W. Horwood1

198 Yarmouth Road, Lowestoft, Suffolk NR32 4AB 1Centre for Environment, Fisheries and Aquaculture Science Pakefield Road, Lowestoft, Suffolk NR32 0HT, UK

; accepted on April 4, 1998 A simple model is used to illustrate the character of production, within an incubation bottle subject to addition of a potentially limiting nutrient, over time periods long relative to the algal dynamics (1–10 days). Grazing by microheterotrophs significantly affects algal and nutrient dynamics, and production reflects the integration over time of grazing and nutrient-regulated growth. Greater production is found with increased nutrient, but this increase continues into the region of luxuriant nutrient. Increased production per se cannot be used to determine whether a nutrient is limiting.


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