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Importance of copepods versus appendicularians in vertical carbon fluxes in a Swedish fjord

Artikel i vetenskaplig tidskrift
Författare C. A. Vargas
K. Tonnesson
A. Sell
M. Maar
E. F. Moller
T. Zervoudaki
A. Giannakourou
E. Christou
S. Satapoomin
J. K. Petersen
T. G. Nielsen
Peter Tiselius
Publicerad i Marine Ecology-Progress Series
Volym 241
Sidor 125-138
ISSN 0171-8630
Publiceringsår 2002
Publicerad vid Institutionen för marin ekologi
Sidor 125-138
Språk en
Länkar <Go to ISI>://000179145900011
Ämnesord carbon flux, appendicularians, copepods, faecal pellet production, marine snow, tunicate oikopleura-vanhoeffeni, particulate organic-carbon, zooplankton fecal pellets, northeast water polynya, marine snow, permanent station, tropical waters, grazing impact, growth-rates, spring bloom
Ämneskategorier Biologiska vetenskaper, Ekologi

Sammanfattning

We examined and quantified the contributions of copepods and appendicularians to the vertical flux of carbon during autumn and spring in Gullmar Fjord (west coast of Sweden). Faecal pellet-production rate was determined for major copepod and appendicularian species. In addition, house-production rates were estimated for the appendicularian Oikopleura dioica. Vertical flux of pigments, faecal carbon and appendicularian houses were measured using short-term (24 h) deployments of sediment traps at 2 depths (15 and 30 m). Copepods dominated the community biomass in both spring and autumn and their pellets dominated the faecal carbon flux. O. dioica houses with attached detritus were an important component of the biogenic carbon flux in October (15.3 mg C m(-2) d(-1)), equalling the contribution from copepods at 15 m and 50% of the flux at 30 m. At that time, we observed a loss rate of 70% d(-1) of the houses produced in the water column. In the spring, although Fritillaria borealis dominated the appendicularians, its houses did not appear to contribute to the biogenic flux. Our results suggest that oikopleurids and fritillariids may not operate equivalently in biogeochemical cycles. Because of the significant contribution of appendicularians to carbon fluxes, they should be incorporated in future flow models of coastal oceans.

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