Mesozooplankton beneath the summer sea ice in McMurdo Sound,Antarctica: abundance,species composition,and DMSP content |
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Authors: | David T Elliott Kam W Tang Amy R Shields |
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Institution: | (1) Virginia Institute of Marine Science, College of William and Mary, Gloucester Pt., Williamsburg, VA 23062, USA;(2) Present address: Water Quality Management Branch, Water, Wetlands, and Pesticides Division, USEPA Region 7, 901 North 5th Street, Kansas City, KS 66101, USA |
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Abstract: | The summer Phaeocystis antarctica bloom increases under-ice phytoplankton biomass in McMurdo Sound, Antarctica. The magnitude of mesozooplankton grazing on
this bloom is unknown, and determines whether this production is available to the pelagic food web. We measured mesozooplankton
abundance and body content of dimethylsulfoniopropionate (DMSP) during the McMurdo Sound austral summer (2006 and 2006–2007).
Abundance varied from 20 to 4,500 ind. m−3 (biomass 0.02–274.0 mg C m−3), with peaks in mid-December and late-January/February. Abundance was higher but total zooplankton biomass lower in our study
compared to previous reports. Copepods and the pteropod Limacina helicina dominated the zooplankton in both abundance and biomass. DMSP was detected in all zooplankton groups, with highest concentrations
in copepod nauplii and L. helicina (95 and 54 nmol mg−1 body C, respectively). Experiments suggested that L. helicina obtains DMSP by directly grazing on P. antarctica, which often accumulates to high biomass under the summer sea ice in McMurdo Sound. |
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Keywords: | Zooplankton DMSP Pteropod Copepod Sea ice |
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