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Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge

Jonasdottir, S. and Richardson, K. and Heath, M.R. and Ingvarsdottir, A. and Christoffersen, A. and , European Union (Funder) (2008) Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge. Deep Sea Research, 55 (4). pp. 471-489. ISSN 0967-0637

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    Abstract

    Distribution and reproduction activity of the calanoid copepod Calanus finmarchicus were studied in the waters between Scotland and Iceland in April 1997 during the expected time of the animals' ascent to surface waters following diapause. Ascent was taking place on both sides of the Iceland-Scotland Ridge, apparently from two separate overwintering centers. The population on the Faroe Shelf (FS) most likely came from the overwintering population in the Faroe Shetland Channel (FSC). Per capita egg production was highest on the FS (> 30 eggs female -1d-1) and lowest in the Iceland Basin (10 eggs female -1d-1). The maximum clutch size recorded was on the FS (145 eggs). As the maximum clutch sizes that females produced were between 40% and 77% (area averages of the station maximum rates) of their size-specific reproduction potential, it is argued that egg production rates were generally food-limited. Chlorophyll a concentrations were, at all but one station, under 1 ugL-1. Chlorophyll-based ingestion could, theoretically, support the observed average egg production rates in the Iceland Basin and on the FS but only about 30% of the observed production at the stations in the East Icelandic Current (EIC). The carbon assimilated through ingestion of phytoplankton, Calanus own eggs and nauplii in the EIC was estimated to be too low to support the frequently observed production of clutches consisting of over 100 eggs. Cannibalism on eggs and nauplii was not likely to have constituted a significant component of dietary carbon intake. However, a combination of feeding and assimilation of reserved lipid remaining from overwintering could be sufficient to explain the observed per capita egg production rates. C. finmarchicus copepod stages 1-3 were only recorded in considerable numbers only on the FS. This suggests higher survival rates of eggs in the shelf waters.

    Item type: Article
    ID code: 18612
    Keywords: north atlantic, calanus finmarchicus, secondary production, fatty acids, hatching, lipid content, Mathematics, Oceanography, Aquatic Science
    Subjects: Science > Mathematics
    Department: Faculty of Science > Mathematics and Statistics
    Faculty of Engineering > Naval Architecture and Marine Engineering
    Related URLs:
      Depositing user: Mrs Ann Lynch
      Date Deposited: 07 Apr 2010 13:00
      Last modified: 05 Sep 2014 02:38
      URI: http://strathprints.strath.ac.uk/id/eprint/18612

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