Biological oceanography across the Southern Indian Ocean - basin scale trends in the zooplankton community

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• 作者：Sigrú ; n Huld Jó ; nasdó ; ttir^a ; ^{sjo@aqua.dtu.dk} ; Torkel Gissel Nielsen^a ; Christian Marc Andersen Borg^a ; ^b ; Eva Friis Mø ; ller^c ; Hans Henrik Jakobsen^c ; Suree Satapoomin^d
• 关键词：Mesozooplankton ; Heterotrophic protists ; Egg production ; Grazing ; Indian Ocean ; Galathea 3
• 刊名：Deep Sea Research Part I: Oceanographic Research Papers
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：75
• 期：Complete
• 页码：16-27
• 全文大小：1513 K

文摘

We present a study on the protozooplankton >5 ¦Ìm and copepods larger than 50 ¦Ìm 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 ¦Ìm in size, dominated by nauplii, and smaller copepods, while 80 % of the biomass (as mg C m^?3) was larger than 1300 ¦Ìm in body length. Predation by the carnivorous copepod Corycaeus sp. was estimated to be able to remove up to 2 %  d^?1 of the copepods <1000 ¦Ìm 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^?1 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^?1) but typical for food limited oligotrophic oceans.