zooplankton biomass ; long term changes ; seasonal cycles
Subject RIV
EG - Zoology
R&D Projects
GA206/01/1113 GA ČR - Czech Science Foundation (CSF)
CEZ
AV0Z6017912 - HBU-Z, BC-A
Annotation
In the narrow and deep Slapy reservoir in years 1964 - 2001. The chlorophyll-a increased relatively more than total phosphorus concentration. The relative increase of the biomass of crustaceoplankton larger than 0.2 mm was in-between. The biomass of copepods nearly equals that of cladocerans. The percentage of cladocerans larger than 0.71 mm (%LCl) determined in the period 1985 - 2001 decreased. and indicates an increase fraction of small fish. In the course of the year there are two subsequent high values of %LCl in spring, the relation of which differs in different years, and are probably due to the spawning activities of two groups of fish probably percids and cyprinids. The low %LCl in autumn can be connected with the increasing size and therefore increased feeding activity of the yearlings in the period of decreasing biomass of zooplankton. The later mild increase can be connected to the decreased activity of cyprinids in the period of decreasing temperature.
Workplace
Institute of Hydrobiology (until 2005)
Contact
Václava Lavičková, lavickova@hbu.cas.cz, Tel.: 387 775 889
Year of Publishing
2004
Number of the records: 1
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