The role of zooplankton grazing in the formation of 'clear water phase' in a shallow charophyte-dominated lake

Autor: Helen Künnap, Ilmar Tõnno, Tiina Nõges
Rok vydání: 2003
Předmět:
Zdroj: Hydrobiologia. :353-358
ISSN: 0018-8158
DOI: 10.1023/b:hydr.0000008579.99831.57
Popis: In Chara-dominated shallow eutrophic Lake Prossa (Estonia), the collapse of spring phytoplankton community occurred in late May after which both primary production (PP) and phytoplankton biomass (Bp) stayed at a very low level. By mid-June the Secchi depth had increased up to 2.6 m indicating the achievement of the `clear water phase', which persisted thoughout the rest of the vegetation period. The biomass of `edible' phytoplankton formed on average 53% of the total phytoplankton biomass, and the share of herbivorous zooplankton was on average 61% of the total zooplankton biomass. In spring zooplankton removed daily 27% of the total Bp and 29% of PP by grazing while in summer these values rarely exceeded 5%. Zooplankton grazing was responsible for the decrease of `edible' (
Databáze: OpenAIRE
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