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The Seasonal Dynamics and Trophic Relations of the Plankton Components in Lake Peipsi (Peipus)

✍ Scribed by Tiina Nõges; Juta Haberman; Malle Timm; Peeter Nõges

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
394 KB
Volume
78
Category
Article
ISSN
1434-2944

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✦ Synopsis

The seasonal dynamics of the biomass and production of phyto-, zoo-and bacterioplankton was investigated during the vegetation periods (from May to November) in 1985 and 1986 in the pelagial of the large eutrophic lake Peipsi (Estonia). The average values of productions per vegetation period for the investigation years were as follows: phytoplanktion -203.5 gC. m-2; bacterioplankton -37.9 gC. m-2; filter-feeding zooplankton -20.6 gC* m-2 and predatory zooplankton -1.5 gC* m-2. The herbivorous zooplankton production constituted 10.1 46 of primary production. This ratio indicates a direct relationship between zoo-and phytoplankton in the food chainfiltrators are feeding mostly on living algae and the detrital food chain seems of little importance. The dominance of large forms (Melosiru sp., Aphunothece saxicolu), in the phytoplankton during the major part of the vegetation period is assumed to be a result of high grazing pressure on small algae. Zooplankton grazing was investigated in situ in a specially constructed twin bathometer. Experimental measurements revealed, that zooplanktion presence in the experimental vessel actually stimulated the phytoplankton growth in many casesthe negative grazing values have been registered. That could be caused by the stimulation effect of nutrients (N, P), excreted by the concentrated zooplankton in the grazing chamber, which led to an increase ofthe nongrazed phytoplankton production. Bacteria have satisfied the zooplankton food requirements on average by 11 Oh. Grazing on bacteria increased, when grazing on phytoplankton was somehow disturbed.

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