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- Title
EFFECT OF NITROGEN AND PHOSPHORUS SUPPLY ON GROWTH AND TISSUE COMPOSITION OF <em>ULVA FENESTRATA</em> AND <em>ENTEROMORPHA INTESTINALIS</em> (ULVALES, CHLOROPHYTA).
- Authors
Björnsäter, Bo R.; Wheeler, Patricia A.
- Abstract
The chlorophyte macroalgae Ulva fenestrata (Psotels and Ruprecht) and Enteromorpha intestinalis (Linaeus) Link were grown under various nutrient regimes in indoor semi-continuous and batch cultures. Tissue nitrogen contents ranged from 1.3-5.4% N (dry wt). Growth in low nitrogen medium resulted in N:P ratios of 5-8, whereas growth in high nitrogen medium resulted in N:P ratios of 21-44. For U. fenestrata, tissue N:P &lt 16 was indicative of N-limitation. Tissue N:P 16-24 was optional for growth and tissue N:P > 24 was indicative of Plimitation. Growth of U. fenestrata was kyperbolicailly related to tram, N but linearly related to tissue P. Phosphorus-tissued U. fenestrata maintained high levels of ti.cnw N. but N-limited algae became, depleted of P. For E. intestinalis, tisse N remained at maximum levels during P-limitation whereas gust P decreased to about 85% of maxima; levels during N-limitation. Growth rates for U. fenestrata decreased faster during P-litaion than during N-limitation. Simultaneously, tissue P was depleted faster than tissue N. Our results suggest that comparing tissue N and P of uscroalgue grown in batch cultures is useful for monitoring the nutritional status of macroalgae.
- Subjects
ENTEROMORPHA; ULVACEAE; ALGAE; CRYPTOGAMS; NITROGEN-fixing algae
- Publication
Journal of Phycology, 1990, Vol 26, Issue 4, p603
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.0022-3646.1990.00603.x