Effects of large nongrazable particles on zooplankton clearance and swimming behaviour

Benni Hansen, Per Juel Hansen, Torkel Gissel Nielsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Latex beads (diameter 45 μm) were used to mimic pelagic particle composition dominated by large nongrazable particles and to examine their effect on clearance and swimming behaviour of a tintinnid, Favella ehrenbergii, a rotifer, Brachionus plicatilis, a gastropod veliger, Philine aperta, and copepodites of the neritic copepod Acartia tonsa. Clearance was measured as a function of bead concentration and compared with swimming patterns and grazing behaviour. The ciliates and the rotifers were not sensitive to mechanical obstruction by the polystyrene beads. The gastropod veligers and the copepodites, however, change swimming behaviour by increasing and jumping frequencies accompanied by a significant reduction in clearance. These observations imply nthat laboratory grazing rates may overestimate in situ grazing activity if larger, noningestible particles are present in the water coloumn.
Original languageEnglish
JournalJournal of Experimental Marine Biology and Ecology
Volume152
Issue number2
Pages (from-to)257-269
ISSN0022-0981
DOIs
Publication statusPublished - 1991
Externally publishedYes

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