Experiments were conducted during cruises of the RRS
Discovery to the NE Atlantic (D262, Mar 2002) and the
RRS James Clark Ross to the Scotia Sea (JR82, Jan
2003). Pulse-chase experiments were conducted
whereby zooplankton were initially fed liposomes in filtered
seawater for 24 h after which animals were transferred
to ambient seawater containing a mixed
community of microplankton equally dominated by
phototrophic flagellates and diatoms (BAS unpublished
data). Zooplankton were collected using vertical hauls
of WP2 nets (200 mm mesh) and sorted under a binocular
microscope immediately after capture. They were
initially placed in 500 mL Duran bottles containing
0.2 mm filtered seawater to which the liposome suspension
(870 mg 500 mL21) had been added