Abstract
Seagrass and algal beds showed a variety of reponses when the water column was treated with low level additions of ammonium, nitrate and phosphate. The nutrients were added separately to 3 uniform seagrass beds of a temperature coastal lagoon during 1979 and 1980. (1) Ammonium caused the production of dense mats of free-floating green algae Enteromorpha plumosa and Ulva lactuca. It also stimulated growth in both the leaf and root-rhizome fractions of Zostera marina. This growth response in Z. marina was greater in the area where current reached 12 cm · s-1 than in the area with little or no current. The concentration of nitrogen in the tissue did not change. In contrast, where current was lacking, Z. marina growth increase with ammonium was small, but the concentration of nitrogen in the tissue doubled over that in control plots. The growth of Ruppia maritima was inversely related to the growth of green algae in the same plots. The red alga Gracilaria tikvahiae did not grow better in ammonium, but its tissue reddened. (2) Nitrate additions enhanced the growth of the green seaweeds Enteromorpha spp. and U. lactuca, but not Z. marina or R. maritima. G. tikvahiae, when fertilized in isolation from other plants, showed a marginal response to this nutrient, and the tissue always reddened. (3) Phosphate enhanced growth in Z. marina and R. maritima exposed to moderate current. G. tikvahiae growing alone showed a small growth response to phosphate. The phosphate made no difference in the growth of the green seaweeds. (4) None of the nutrient supplements noticeably altered the species composition of either epiphytic or planktonic algae associated with the beds, although we did detect small increases in their numbers. The rapid and dense growth of green algae in nitrogen-enriched water probably limited growth of adjacent seagrasses and red algae. Because these seaweeds did not use the phosphate, it became available to other plant components. The overall floral response to nutrient addition in seagrass communities depends, therefore, upon the particular nutrient supplied, the ability of alternate species in the area to compete for that nutrient and the velocity of current in the specific area.
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Literature Cited
Calabresse, G. and G. P. Felicini: Ricerche sui pigmenti delle alghe rosse. (1) Analisi qualitativa e quantitativa dei pigmenti di Pterocladia capillacea coltivata in presenza di alcune fonti minerali di azoto. Gion. Bot. Ital. 104, 81–89 (1970)
Chapman, A. R. O. and J. S. Craigie: Seasonal growth in Laminaria longicruris: relations with dissolved inorganic nutrients and internal reserves of nitrogen. Mar. Biol. 40, 197–205 (1977)
Conover, J. T.: The importance of natural diffusion gradients and transport of substances related to benthic plant metabolism. Botanica mar. 11, 1–9 (1968)
Enright, C. T.: Competitive interaction between Chondrus crispus (Rhodophyceae) and Ulva lactuca (Chlorophyceae) in Chondrus aquaculture. Proc. Int. Seaweed Symp. 9, 209–218 (1978)
Eppley, R. W.: Nitrate uptake. In: Handbook of phycological methods: physiological and biochemical methods. pp 401–409. Ed. by J. A. Hellebust and J. S. Craigie. Cambridge: Cambridge University Press 1978
Fitzgerald, George P.: Some factors in the competition or antagonism among bacteria, algae, and aquatic weeds. J. Phycol. 5, 351–359 (1969)
Guist, G. G. and H. J. Humm: Effects of sewage effluents on growth of Ulva lactuca. Florida Sci. 39, 267–271 (1976)
Harlin, M. M.: Nitrate uptake by Enteromorpha spp. (Chlorophyceae): applications to aquaculture systems. Aquaculture 15, 373–376 (1978)
Harlin, M. M., B. Thorne-Miller and G. B. Thursby: Ammonium uptake by Gracilaria sp. (Rhodophyceae) and Ulva lactuca (Chlorophyceae) in closed system fish culture. Proc. Int. Seaweed Symp. 9, 285–292 (1978)
Ho, Y. B.: Inorganic mineral nutrient level studies on Potomogeton pectinatus L. and Enteromorpha prolifera in Forfar Loch. Scotland. Hydrobiologia 62, 7–15 (1979)
Iizumi, H., A. Hattori and C. P. McRoy: Nitrate and nitrite in interstitial waters of eelgrass beds in relation to the rhizosphere. J. exp. mar. Biol. Ecol. 47, 191–201 (1980)
Jupp, B. P. and D. H. N. Spence: Limitations on macrophytes in a eutrophic lake. Loch Leven I. Effects of phytoplankton. J. Ecol. 65, 175–186 (1977)
Kindig, A. C. and M. M. Littler: Growth and primary productivity of marine macrophytes exposed to domestic sewage effluent. Mar. environ. Res. 3, 81–100 (1980)
Littler, M. M. and S. N. Murray: Impact of sewage on the distribution, abundance and community structure of rocky intertidal macro-organisms. Mar. Biol. 30, 277–291 (1975)
McRoy, C. P. and R. J. Barsdate: Phosphate absorption in eelgrass. Limnol. Oceanog. 15, 6–13 (1970)
Mendelssohn, I. A.: Nitrogen metabolism in the height forms of Spartina alterniflora in North Carolina. Ecology 60, 574–584 (1979)
Morris, I.: Nitrogen assimilation and protein synthesis. Ch. 21. In: Algal physiology and biochemistry. pp 583–609. Ed. by W. D. P. Stewart. Berkeley: U. Calif. Press 1974
Mulligan, H. F. and A. Baranowski: Growth of phytoplankton and vascular aquatic plants at different nutrient levels. Verh. Internat. Verein. Limnol. 17, 802–810 (1969)
Mulligan, H. F., A. Baranowski and R. Johnson: Nitrogen and phosphorus fertilization of aquatic vascular plants and algae in replicated ponds. I. Initial response to fertilization. Hydrobiologia 48, 109–116 (1976)
Murray, S. N. and M. M. Littler: Patterns of algal succession in a perturbated marine intertidal community. J. Phycol. 14, 506–512 (1978)
Nichols, D. S. and D. R. Keeney: Nitrogen nutrition of Myriophyllum spicatum: uptake and translocation of 15N by shoots and roots. Freshwater Biol. 6, 145–154 (1976)
Orth, R. J.: Effect of nutrient enrichment on growth of the eelgrass Zostera marina in the Chesapeake Bay, Virginia, USA. Mar. Biol. 44, 187–194 (1977)
Otie, G.: Investigations on the effects of domestic sewage on the benthic ecosystem of marine intertidal flats. Helgo. Wissen. Meeresunters. 32, 73–148 (1979)
Patriquin, D.: Estimation of growth rate, production and age of the marine angiosperm Thalassia testudinum Konig. Carib. J. Sci. 13, 111–123 (1973)
Phillips, G. L., D. Eminson and B. Moss: A mechanism to account for macrophyte decline in progressively eutrophicated freshwaters. Aquat. Bot. 4, 103–126 (1978)
Raymont, J. E. G.: A fish farming experiment in Scottish sea lochs. J. mar. Res. 67, 219–227 (1947)
Ryther, J. H. and W. M. Dunstan: Nitrogen, phosphorus, and eutrophication in the coastal marine environment. Science, NY 171, 1008–1013 (1971)
Sawyer, C. M.: The sea lettuce problem in Boston Harbor. J. Water Poll. Cont. Fed. 37, 1122–1133 (1965)
Sheath, R. G., J. A. Hellebust and T. Sawa: Changes in plastid structure, pigmentation and photosynthesis of the conchocelis stage of Porphyra leucosticta (Rhodophyta, Bangiophyceae) in response to low light darkness. Phycologia 16, 265–276 (1977)
Strickland, J. D. H. and T. R. Parsons: A practical handbook of seawater analysis. Fish. Res. Bd Can. Bull. 167, 310 pp (2nd ed) 1972
Tewari, A.: The effect of sewage pollution on Enteromorpha prolifera var. tubulosa growing under natural habitat. Bot. Mar. 15, 167 (1972)
Waite, T. and R. Mitchell: The effect of nutrient fertilization on the benthic alga Ulva lactuca. Bot. mar. 15, 151–156 (1972)
Wheeler, W. N.: Effect of boundary layer transport on the fixation of carbon by the giant kelp Macrocystis pyrifera. Mar. Biol. 56, 103–110 (1980)
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Communicated by S. K. Pierce, College Park
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Harlin, M.M., Thorne-Miller, B. Nutrient enrichment of seagrass beds in a rhode island coastal lagoon. Mar. Biol. 65, 221–229 (1981). https://doi.org/10.1007/BF00397115
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DOI: https://doi.org/10.1007/BF00397115