White et al.--Nutrient limitation in Lake Horowhenua

New Zealand Journal of Marine and Freshwater Research abstracts

Seasonal variation in nutrient limitation of the algal community in Lake Horowhenua, New Zealand

E. WHITE

G.PAYNE

S.PICKMERE

P. WOODS

Taupo Research Laboratory
DSIR Marine and Freshwater
Department of Scientific and Industrial Research
P. O. Box 415, Taupo, New Zealand

Abstract Nutrient limitation of growth of the algal community in Lake Horowhenua was assessed by: reference to nutrient concentrations; short-term physiological assays, which indicate nutrient deficiencies in algae; and a laboratory growth assay where the algal community responds with chlorophyll a production over a period of 4 days on relief of shortage of the limiting nutrient. Shortage of phosphorus limited algal growth during winter months whereas nutrient nitrogen shortage restricted growth in summer.

Keywords algae; ammonium enhancement; ammonium uptake; chlorophyll a; growth assay; hypertrophic; Lake Horowhenua; nitrate uptake; nutrient limitation; phosphorus uptake; plant nutrients

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