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


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).


biomass phytoplankton seasonal distribution tropical lake 


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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

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