Copepoda 8 Oithona similis Biomass 4 Calanoida 4 Cyclopoida 4 Southern Ocean 4 abundance 4 dominance 4 sea surface temperature 4 Acartia tonsa 2 Appendicularia (class) 2 Beagle Channel 2 Calanus simillimus 2 Community structure 2 Copepods 2 Ctenocalanus citer 2 Density 2 Drake Passage 2 Drepanopus forcipatus 2 Feeding rates 2 Fritillaria borealis 2 Interannual fluctuations 2 Mesozooplankton 2 Oithonidae 2 Zooplankton 2 annual variation 2 biomass 2 community composition 2 community structure 2 crustacean 2