Department of Plant Physiology, University of Göteborg Carl Skottsbergs Gata 22, S-413 19 Göteborg, Sweden.
EFFECT OF NITROGEN AND PHOSPHORUS SUPPLY ON GROWTH AND TISSUE COMPOSITION OF ULVA FENESTRATA AND ENTEROMORPHA INTESTINALIS (ULVALES, CHLOROPHYTA)1
Article first published online: 28 OCT 2004
Journal of Phycology
Volume 26, Issue 4, pages 603–611, December 1990
How to Cite
Björnsäter, B. R. and Wheeler, P. A. (1990), EFFECT OF NITROGEN AND PHOSPHORUS SUPPLY ON GROWTH AND TISSUE COMPOSITION OF ULVA FENESTRATA AND ENTEROMORPHA INTESTINALIS (ULVALES, CHLOROPHYTA). Journal of Phycology, 26: 603–611. doi: 10.1111/j.0022-3646.1990.00603.x
Received 27 December 1989. Accepted 16 August 1990.
This work was supported by a grant from the Swedish-American Foundation to B. R. Björnsäter and in part by NSF grant OCE-8501369 to P. A. Wheeler and R. M. Fujita. Jane Lubchenco and S. V. Smith provided valuable comments on an earlier draft of the manuscript.
- Issue published online: 28 OCT 2004
- Article first published online: 28 OCT 2004
- Enteromorpha intestinals;
- growth rates;
- nutrient limitation;
- tissue nitrogen;
- tissue phosphorus;
- Ulva fenestrata
The chlorophyte macroalgae Ulva fenestrata (Postels and Ruprecht) and Enteromorpha intestinalis (Linnaeus) 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), whereas tissue P ranged from 0.21–0.56% P (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 < 16 was indicative of N-limitation. Tissue N:P 16–24 was optimal for growth and tissue N:P > 24 was indicative of P-limitation. Growth of U. fenestrata was hyperbolically related to tissue N but linearly related to tissue P. Phosphorus-limited U. fenestrata maintained high levels of tissue N, but N-limited algae became depleted of P. For E. intestinalis, tissue N remained at maximum levels during P-limitation whereas tissue P decreased to about 85% of maximal levels during N-limitation. Growth rates for U. fenestrata decreased faster during P-limitation than during N-limitation. Simultaneously, tissue P was depleted faster than tissue N. Our results suggest that comparing tissue N and P of macroalage grown in batch cultures is useful for monitoring the nutritional status of macroalgae.