(Table 1) 100 m integrated temperature, chlorophyll a content and protist biomass during Leg 7 of Galathea 3 cruise (2006)

• Main Author: Jónasdóttir, Sigrún Huld
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Chlorophyll a; areal concentration; standard deviation; Copepoda; biomass as carbon; integrated; DATE/TIME; Depth; bottom/max; top/min; Event label; Galathea_3/7-1; Galathea_3/7-15; Galathea_3/7-18; Galathea_3/7-23; Galathea_3/7-28; Galathea_3/7-33; Galathea_3/7-8; Galathea 3; HDMS Vaedderen; Indian Ocean; International Polar Year (2007-2008); IPY; Latitude of event; Longitude of event; MULT; Multiple investigations; Protista; Temperature; water; Indian; International Polar Year; Copepods
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.835227; https://doi.org/10.1594/PANGAEA.835227

We present a study on the protozooplankton >5 µm and copepods larger than 50 µm at a series of contrasting stations across the Southern Indian Ocean (SIO). Numerically, over 80% of the copepod community across the transect was less than 650 µm in size, dominated by nauplii, and smaller copepods, while 80% of the biomass (as mg C/m**3) was larger than 1300 µm in body length. Predation by the carnivorous copepod Corycaeus sp. was estimated to be able to remove up to 2% /d of the copepods <1000 µm in size. By the help of grazing models we estimated that primary producers were mainly grazed upon by ciliates and heterotrophic dinoflagellates (40-80% /d combined) in temperate waters but appendicularians became increasingly important in the tropical waters grazing about 40% of the biomass per day. Despite their high abundance and biomass, copepods contributed less than 20% of the grazing at most stations. Secondary production was low (carbon specific egg production <0.14 /d) but typical for food limited oligotrophic oceans.