Abstract
Two of three Kenyan lakes studied between November 1979 and October 1980 have very short 33PO4 turnover times, indicating a high phosphorus (P) demand throughout the year. The P turnover time in Lakes Oloidien and Sonachi is as rapid as in the most P deficient temperate zone lakes. The third lake, Lake Naivasha, has a lower overall P demand and a wide seasonal range, with lowest demand between November 1979 and February 1980 when a P deficiency was unlikely. On an annual basis the Lake Naivasha status is, however, not statistically different from that recorded during the summer in Lake Memphremagog, a generally P-limited temperate zone lake. Lake Naivasha and Lake Oloidien fit well to the line of best fit for the Dillon-Rigler relationship relating total phosphorus (TP) and chlorophyll a derived in temperate zone lakes. Thus, temperate zone models predicting aspects of lake behaviour on the basis of TP may also be applicable to these two tropical lakes. Saline lake Sonachi had not only a short P turnover time but also responded dramatically to the fertilization of enclosures with P. However, it does not fit the TP-chla or the total nitrogen-chla plots from the temperate zone. This suggests that, in this saline lake at least, much of the TP is unavailable to the algae, with some of it in a particulate form that is readily extracted with boiling water. The epilimnetic N:P ratios also characterize lakes Oloidien and Sonachi lakes as highly P deficient and lake Naivasha as more moderately P limited. A single set of measurements in Winam Gulf (Lake Victoria) also showed a rapid P turnover time and thus P limitation, but as in lake Sonachi much of the TP was in a non-algal particulate form. Occasional measurements in three other hypertrophic and saline lakes suggest them to be primarily light limited on the basis of their very high photosynthetic cover. These findings support the hypothesis of a primary P limitation for those lakes not light limited, and contradicts literature suggestions that nitrogen is the primary limiting element in tropical lakes.
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References
Ahlgren, G., 1970. Limnological studies of lake Norviken, a eutrophicated Swedish lake. 2. Phytoplankton and its production. Schweiz Z. Hydrol. 32: 353–396.
Bergman, M. & Peters, R. H., 1980. A simple reflectance method for the measurement of particulate pigment in lake water and its application to phosphorus-chlorophyll seston relationships. Can. J. Fish. aquat. Sci. 37: 111–114.
Burgis, M. J., Darlington, J. P. E., Dunn, I. G., Ganf, G. G., Gwahaba, J. J. & McGowan, L. M., 1973. The biomass and distribution of organisms in Lake George, Uganda. Proc. R. Soc. Lond. B. 184: 271–298.
Conover, W. J., 1971. Practical nonparametric statistics. J. Wiley & Sons, N.Y., 462 pp.
Dillon, P. J. & Rigler, F. H., 1974. The phosphorus-chlorophyll relationship in lakes. Limnol. Oceanogr. 19: 767–773.
Dufour, P., Lemasson, L. & Cremoux, J. L., 1981. Contrôle nutritif de la biomasse du seston dans une lagune tropicale de côte de'ivoire. 2. Variations geographiques et saisonnières. J. exp. mar. Biol. Ecol. 51: 269–284.
Fitzgerald, G. P. & Nelson, T. C., 1966. Extractive and enzmatic analysis for limiting or surplus phosphorus in algae. J. Phycol. 2: 32–37.
Forsberg, C. & Ryding, S. O., 1980. Eutrophication parameters and trophic state indices in 30 Swedish waste-receiving lakes. Arch. Hydrobiol. 84: 189–207.
Gaudet, J. J., 1979. Seasonal changes in nutrients in tropical swamp water. J. Ecol. 67: 953–981.
Gaudet, J. J. & Melack, J. M., 1981. Major ion chemistry in a tropical African lake basin. Freshwat. Biol. 11: 309–333.
Gerhart, D. Z. & Likens, G. E., 1975. Enrichment experiments for determining nutrient limitation: four methods compared. Limnol. Oceanogr. 20: 679–653.
Hanson, J. M. & Leggett, W. C., 1982. Empirical prediction of fish biomass and yield. Can. J. Fish. aquat. Sci. 39: 257–263.
Johnson, D. L., 1971. Simultaneous determination of arsenate and phosphorus. Envir. Sci. Technol. 5: 411–414.
Lean, D. R. S. & Nalewajko, C., 1979. Phosphorus turnover time and phosphorus demand in large and small lakes. Arch. Hydrobiol. Beih. 13: 120–132.
Lewis, W. M., 1974. Primary production in the plankton community of a tropical lake. Ecol. Monogr. 44: 377–409.
MacIntyre, S. & Melack, J. M., 1982. Meromixisin an equatorial African soda lake. Limnol. Oceanogr. 27: 595–609.
McCauley, E. & Kalff, J., 1981. Empirical relationships between phytoplankton and zooplankton biomass in lakes. Can. J. Fish. aquat. Sci. 38: 458–463.
Melack, J. M. & Kilham, P., 1974. Photosynthetic rates of phytoplankton in East African alkaline, saline lakes. Limnol. Oceanogr. 19: 743–755.
Melack, J. M., 1979. Photosynthesis rates in four tropical African freshwaters. Freshwat. Biol. 9: 535–571.
Melack, J. M., 1981. Photosynthetic activity of phytoplankton in tropical African soda lakes. Hydrobiologia 81: 71–85.
Melack, J. M., Kilham, P. & Fisher, T. R., 1982. Responses of phytoplankton to experimental fertilization with ammonium and phosphate in an African soda lake. Oecologia 55: 1–6.
Milbrink, G., 1977. On the limnology of two alkaline lakes (Nakuru and Naivasha) in the east rift valley system in Kenya. Int. Revue. ges. Hydrobiol. 62: 1–17.
Moss, B., 1969. Limitation of algal growth in some central African waters. Limnol. Oceanogr. 14: 591–601.
Peters, R. H., 1975. Orthophosphate turnover in central European Lakes. Mem. Ist. ital. Idrobiol. 32: 297–311.
Peters, R. H. & MacIntyre, S., 1976. Orthophosphate turnover in East African lakes. Oecologia 25: 313–319.
Peters, R. H., 1979. Concentration and kinetics of phosphorus fraction along the trophic gradient of lake Memphremagog. J. Fish. Res. Bd Can. 36: 970–979.
Pettersson, K., 1980. Alkaline phosphatase activity and algal surplus phosphorus as phosphorus-deficiency indicators in Lake Erken. Arch. Hydrobiol. 89: 54–87.
Richardson, J. L. & Richardson, A. E., 1972. History of an African lake and its climatic implications. Ecol. Monogr. 42: 499–534.
Rigler, F. H., 1964. The phosphorus fractions and the turnover time of inorganic phosphorus in different types of lakes. Limnol. Oceanogr. 9: 511–518.
Rigler, F. H., 1966. Radiobiological analysis of inorganic phosphorus in lake water. Verh. int. Ver. Limnol. 16: 465–470.
Robarts, R. D. & Southall, G. C., 1977. Nutrient limitation phytoplankton growth in seven tropical man-made lakes, with special reference to Lake McIlwaine, Rhodesia. Arch. Hydrobiol. 79: 1–35.
Sakamoto, M., 1966. Primary production by phytoplankton community in some Japanese lakes and its dependence on lake depth. Arch. Hydrobiol. 62: 1–28.
Scheiner, D., 1974. A modified version of the sodium salicylate method for the analysis of wastewater nitrates. Wat. Res. 8: 835–840.
Schindler, D. W., 1975. Whole-lake eutrophication experiments with phosphorus, nitrogen, carbon. Verh. int. Ver. Limnol. 19: 3221–31.
Smith, V. H., 1982. The nitrogen and phosphorus dependence of algal biomass in lakes: an empirical and theoretical analysis. Limnol. Oceanogr. 27: 1101–1112.
Sproule, J. L. & Kalff, J., 1978. Seasonal cycles in the phytoplankton phosphorus status of a north temperate zone lake (Lake Memphremagog, Qué.-Vt.), plus a comparison of techniques. Verh. int. Ver. Limnol. 20: 2681–2688.
Storch, T. A. & Dietrich, G. A., 1979. Seasonal cycling of algal nutrient limitation in Chautauqua Lake, New York. J. Phycol. 15: 399–405.
Strickland, J. D. H. & Parsons, T. R., 1972. A practical handbook of seawater analysis. Bull. Fish. Res. Bd 167, 310 pp.
Talling, J. F., 1965. The photosynthetic activity of phytoplankton in East African lakes. Int. Revue. ges. Hydrobiol. 50: 1–32.
Talling, J. F. & Talling, I. B., 1965. The chemical composition of African lake water. Int. Revue ges. Hydrobiol. 50: 421–463.
Talling, J. F., 1966. The annual cycle of stratification and phytoplankton growth in Lake Victoria (East Africa). Int. Revue ges. Hydrobiol. 51: 545–621.
Talling, J. F. & Rzoska, J., 1967. The development of plankton in relation to the hydrological regime in the Blue Nile. J. Ecol. 55: 637–662.
Talling, J. F., 1970. Generalized and special feature of phytoplankton as a form of photosynthetic cover. pp. 431–445. In prediction and measurement of photosynthetic productivity. C. A. P. Wageningen, 632 pp.
Viner, A. B., 1969. The chemistry of the water of Lake George, Uganda. Verh. Int. Ver. Limnol. 17: 289–296.
Viner, A. B., 1973. Responses of a mixed phytoplankton population to nutrient enrichments of ammonia and phosphate, and some associated ecological implications. Proc. r. Soc. B. 183: 351–376.
Vollenweider, R. A., 1968. Scientific fundamentals of the eutrophication of lakes and flowing waters, with particular references to nitrogen and phosphorus as factors in eutrophication. Org. Econ. Coop. Dev. DAS/CSI/68.27 Rep. Paris, 253 pp.
Watson, S. & Kalff, J., 1981. Relationships between nannoplankton and lake trophic status. Can. J. Fish. aquat. Sci. 38: 960–967.
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Kalff, J. Phosphorus limitation in some tropical African lakes. Hydrobiologia 100, 101–112 (1983). https://doi.org/10.1007/BF00027425
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DOI: https://doi.org/10.1007/BF00027425