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Träfflista för sökning "WFRF:(Jónasdóttir Sigrún H.) "

Search: WFRF:(Jónasdóttir Sigrún H.)

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1.
  • Friis Møller, Eva, et al. (author)
  • Production and fate of copepod fecal pellets acrossthe Southern Indian Ocean
  • 2011
  • In: Marine Biology. - : Springer Science and Business Media LLC. - 0025-3162 .- 1432-1793. ; 158:3, s. 677-688
  • Journal article (peer-reviewed)abstract
    • The vertical distribution of copepods, fecal pellets and the fecal pellet production of copepods were measured at seven stations across the Southern Indian Ocean from productive areas off South Africa to oligotrophic waters off Northern Australia during October/November 2006. We quantified export of copepod fecal pellet from surface waters and how much was retained. Furthermore, the potential impact of Oncaea spp. and harpacticoid copepods on fecal pellets degradation was evaluated and found to be regional substantial. The highest copepod abundance and fecal pellet production was found in the western nutrient-rich stations close to South Africa and the lowest at the central oligotrophic stations. The in situ copepod fecal pellet production varied between 1 and 1,000 mu g C m(-3) day(-1). At all stations, the retention of fecal pellets in the upper 400 m of the water column was more than 99% and the vertical export of fecal pellets was low (< 0.02 mg m(-2) day(-1)).
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2.
  • Møller, Eva Friis, et al. (author)
  • The effect of changes in temperature and food on the development of calanus finmarchicus and Calanus helgolandicus populations
  • 2012
  • In: Limnology and Oceanography. - : Wiley. - 0024-3590. ; 57, s. 211-220
  • Journal article (peer-reviewed)abstract
    • We studied the response in development times of Calanus finmarchicus and Calanus helgolandicus to changes in temperature and food conditions. Grazing experiments were performed at different temperatures for both species, and the results were implemented in a stage-resolved zooplankton population model that predicted development times from biomass increments controlled by ingestion and metabolic losses. Predictions were validated against development data from the literature, and show that C. finmarchicus develops faster than C. helgolandicus below 11 °C and slower above. The different relative development rates of the species are related to different temperature responses in ingestion rates. A temperature increase of 1 °C to 2 °C may have consequences for the relative contribution of C. helgolandicus and C. finmarchicus to the copepod community, and both seasonal and spatial displacements of the Calanus populations can be expected under climate change.
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