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Biological oceanography across the Southern Indian Ocean - basin scale trends in the zooplankton community
Stockholm University, Faculty of Science, Department of Systems Ecology.
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2013 (English)In: Deep Sea Research Part I: Oceanographic Research Papers, ISSN 0967-0637, E-ISSN 1879-0119, Vol. 75, 16-27 p.Article in journal (Refereed) Published
Abstract [en]

We present a study on the protozooplankton > 5 mu m and copepods larger than 50 mu m 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 mu m in size, dominated by nauplii, and smaller copepods, while 80% of the biomass (as mg C m(-3)) was larger than 1300 mu m 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 mu m 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.

Place, publisher, year, edition, pages
2013. Vol. 75, 16-27 p.
Keyword [en]
Mesozooplankton, Heterotrophic protists, Egg production, Grazing, Indian Ocean, Galathea 3
National Category
Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:su:diva-90184DOI: 10.1016/j.dsr.2013.01.011ISI: 000317888800002OAI: oai:DiVA.org:su-90184DiVA: diva2:623829
Note

AuthorCount:6;

Available from: 2013-05-28 Created: 2013-05-28 Last updated: 2017-12-06Bibliographically approved

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Department of Systems Ecology
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Deep Sea Research Part I: Oceanographic Research Papers
Oceanography, Hydrology, Water Resources

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