Fritillaria borealis 10 Appendicularia (class) 8 Atlantic Ocean 6 Copepoda 6 Fritillaria (appendicularian) 6 Oikopleura dioica 6 Animalia 4 Atlantic Ocean (Southwest) 4 Oikopleura fusiformis 4 abundance 4 biomass 4 zooplankton 4 Appendicularia 2 Appendicularia sicula 2 Argentina 2 Argentine Shelf 2 Biomass 2 Calanoida 2 Community structure 2 Cyclopoida 2 Engraulidae 2 Engraulis anchoita 2 Feeding rates 2 Fritillaria borealis intermedia 2 Fritillaria borealis sargassi 2 Fritillaria borealis typica 2 La Plata River estuary 2 Mesozooplankton 2 Oithona similis 2 Oithonidae 2