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  • seasonal distribution  (1)
  • zooplankton  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Phytoplankton biomass in Lake Xolotlán (Managua): Its seasonal and horizontal distribution (1991)
    Springer
    Aquatic ecology 25 (1991), S. 125-131 
    Details
    ISSN: 1573-5125
    Keywords: biomass ; phytoplankton ; seasonal distribution ; tropical lake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02291243
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Natural diet of herbivorous zooplankton in Lake Xolotlán (Managua) (1991)
    Springer
    Aquatic ecology 25 (1991), S. 163-167 
    Details
    ISSN: 1573-5125
    Keywords: zooplankton ; food ; trophic relations ; gut contents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The natural diet of herbivorous zooplankton was analyzed for a better understanding of the trophic relationships in Lake Xolotlán (Managua). Gut content of the most common zooplankton species (Arctodiaptomus dorsalis, Moina micrura andDiaphanosoma fluviatile) were analyzed. The quality and the relative abundance of ingested algae was studied. The most consumed algae during the dry season (February) wereCyclotella, Oocystis andLyngbya, and during the rainy season (November)Cyclotella, Oocystis andChroococcus. The kind of food ingested byA. dorsalis andM. micrura was similar in both periods. There was no similarity with the diet ofD. fluviatile. During the dry season, when algal biomass in the lake was high,A. dorsalis andM. micrura ingested a higher proportion of diatoms. During the rainy season, when food was scarce, the diet was more diverse and bluegreen algae (Chroococcus) were ingested in a larger proportion.Diaphanosoma fluviatile ingested predominantly tiny particles (bacteria and detritus) and algal food consisted mainly of green algae (Oocystis) and probably (not studied) nanoplanktonic algae. The results were consistent with those obtained in other lakes, indicating the importance of diatoms and green algae for zooplankton nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02291249
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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