Hydrobiological Bulletin

, Volume 25, Issue 2, pp 125–131 | Cite as

Phytoplankton biomass in Lake Xolotlán (Managua): Its seasonal and horizontal distribution

  • E. Hooker
  • S. Hernandez
Article

Abstract

Seasonal changes in the pytoplankton community was studied in Lake Xolotlán (Managua). Cyanophyta were found to be dominant throughout the year. Phytoplankton biomass was estimated by volume (wet weight) and by chlorophyll-a at two localities. Seasonal biomass fluctuations were monthly measured for two years. The lowest annual phytoplankton biomass was observed at the end of the rainy season (October-November), and the highest during the dry period (January–February). Short-term studies (3–14 days) on daily biomass changes were also performed. Significant variations in total biomass over short time spans were detected at both localities. Horizontal distribution of phytoplankton was also determined during 30 months. It proved that the lake was quite homogeneous. The results also revealed a great homogeneity with regard to species composition throughout the year. Biomass was permanently high (15.75±5.89 mg.l−1 wet weight, annual average) in front of Managua city where anthropogenic influence is more immediate, whereas the north central region has a comparatively lower biomass (9.07±2.4 mg.l). Lake Xolotlán may be considered as hypertrophic, taking into account its high chlorophyll-a concentration (79 μg.l−1 as annual average for 1987–1988).

Keywords

biomass phytoplankton seasonal distribution tropical lake 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. ANTIA, N.J. and J.Y. CHENG, 1970. The survival of axenic cultures of marine planktonic algae from prolonged exposure to darkness at 20°C. Phycologia, 9: 179–183.Google Scholar
  2. BURGIS, M.J., J.P. DARLINGTON, I.G. DUNN, G.G. GANF, J.G. GWAHABA and L.M. MCGOWAN, 1973. The biomass and distribution of organisms in Lake George, Uganda. Proc. Roy. Soc Lond. B., 184: 271–298.Google Scholar
  3. DOKULIL, M., 1971. Respiration and resistancy against anaerobiosis of freshwater algae. Int. Revue ges. Hydrobiol. Hydrogr., 56: 751–768.Google Scholar
  4. DOKULIL, M., 1979. Seasonal pattern of phytoplankton. In: H. Loeffler, Ed., Neusiedlersee: The limnology of a shallow Lake in Central Europe. Dr. W. Junk Publishers. The Hague, p. 203–231.Google Scholar
  5. DOKULIL, M., K. BAUER and I. SILVA, 1983. An assessment of the phytoplankton biomass and primary productivity of Parakrama Samudra, a shallow man-made Lake in Sri Lanka. In: F. Schiemer, Ed., Limnology of Parakrama Samudra-Sri Lanka. Dr W. Junk Publishers, The Hague, p. 49–74.Google Scholar
  6. HECKY, R.E., E.J. FEE, H. KLING and J.W. RUDD, 1978. Studies on the planktonic ecology of Lake Tanganyika. Can. Fish. Mar. Serv. Tech. Rep. 816, 51 pp.Google Scholar
  7. HUTCHINSON, G.E., 1967. A Treatise on Limnology, vol. II. Introduction to lake biology and the limnoplankton. Wiley and Sons, New York.Google Scholar
  8. IRENA, 1986. Estudio del fitoplancton del lago de Managua. Informe final, no publicado.Google Scholar
  9. KALFF, J. and S. WATSON, 1986. Phytoplankton and its dynamics in two tropical lakes: a tropical and temperate zone comparison. Hydrobiologa, 138: 161–176.Google Scholar
  10. LEWIS, W. Jr., 1978. A compositional, phytogeographical and elementary structural analysis of the phytoplankton in a tropical lake: Lake Lanao, Philippines. J. Ecol., 66: 213–226.Google Scholar
  11. LEWIS, W.L. and W. RIEHL, 1982. Phytoplankton composition and morphology in Lake Valencia, Venezuela. Int. Revue ges. Hydrobiol., 67: 297–322.Google Scholar
  12. LEWIS, W. Jr., 1986. Phytoplankton succession in Lake Valencia, Venezuela. Hydrobiologia, 138: 189–203.Google Scholar
  13. MONTENEGRO-GUILLEN, S., 1991. Limnological perspective of Lake Xolotlán (Managua): The PLALM. Hydrobiol. Bull., 25: 105–109.Google Scholar
  14. NUSCH, E.A. and G. PALME, 1975. Biologische Methoden für der Praxis der Gewässeruntersuchung, Bestimmung des Chlorophyll-a and Phaeopigment-gehaltes in Oberflachenwässer. GWF-Wasser/Abwässer, 116: 562–565.Google Scholar
  15. SALAS, H. and P. MARTINO, 1990. Metodologias simplificadas para la evoluación de eutroficación en lagos cálidos tropicales. Programa Regional CEPIS/OPS/PE, pp. 51Google Scholar
  16. SERRUYA, C.L. and U. POLLINGHER, 1977. Lowering of water level and algal biomass in Lake Kinneret. Hydrobiologia, 54: 73–80.Google Scholar
  17. TALLING, J.F., 1965. Comparative problems of phytoplankton production and photosynthetic productivity in a tropical and a temperature lake. Mem. Ist. Ital. Idrobiol., 18: 399–424.Google Scholar
  18. TALLING, J.F., 1986. The seasonality of phytoplankton in African lakes. Hydrobiologia, 138: 139–160.Google Scholar
  19. UTERMOEHL, H., 1958. Zur Vervollkommnung der quantitativen Phytoplanktonmethodik. Mitt. internat. Verein. Limnol., 9: 1–38.Google Scholar
  20. WETZEL, R.G., 1983. Limnology. Second edition. Saunders College Publishing, U.S.A.Google Scholar

Copyright information

© Netherlands Hydrobiological Society 1991

Authors and Affiliations

  • E. Hooker
    • 1
  • S. Hernandez
    • 1
  1. 1.Centro para la investigacion en recursos acuaticos de nicaraguaManaguaNicaragua

Personalised recommendations