Original paper
The trophic transfer via a picoplankton-flagellate-copepod food chain during a picocyanobacterial bloom in Lake Biwa trab:4
Nagata, Toshi; Takai, Kenji; Kawabata, Kei-ichi; Nakanishi, Masami; Urabe, Jotaro
Archiv für Hydrobiologie Volume 137 Number 2 (1996), p. 145 - 160
41 references
published: Aug 14, 1996
DOI: 10.1127/archiv-hydrobiol/137/1996/145
ArtNo. ESP141013702000, Price: 29.00 €
Abstract
We examined whether or not the production of autotrophic picoplankton and heterotrophic bacteria (collectively, picoplankton) is funnelled up food web via a picoplankton-nanoflagellate-copepod food chain during a picocyanobacterial bloom in Lake Biwa. The experiment was carried out in late summer when the abundance of picocyanobacteria was of its seasonal maximum (7 x 105 cells ml-1) and copepods (Eodiaptomus japonicus) dominated the mesozooplankton assemblage. The grazing rates of a mesozooplankton assemblage on nanoflagellates and picoplankton were determined from changes in apparent growth rates of nanoflagellates and picoplankton with increasing mesozooplankton biomass in incubation bottles. Results indicated that the mesozooplankton assemblage consumed nanoflagellates but not picoplankton directly. Dilution culture experiments revealed that the production of picoplankton was mostly consumed by protozoan grazers in the cell-size fraction of <20 μm (nanoflagellates). carbon flux estimates indicated that of total carbon channelled from picoplankton to nanoflagellates (630 mg cm-2 day-1Keywords