ARICE data

Egg production data of the Arctic copepods Calanus glacialis/marshallae, C. hyperboreus and Metridia longa in Amundsen Gulf

Ship: CCGS Amundsen CA
Expedition: Other
Principal Investigator: Louis Fortier
Start Date: 11-11-2007
End Date: 28-07-2008
Citation: Darnis, G., Unpublished data
Abstract: The time series was conducted from 11 November 2007 to 28 July 2008. Live samples for egg production experiments were collected weekly at sites in Amundsen Gulf. Females of all three species were present year round and reproduced successfully in the study region. For one experiment, thirty randomly selected females of each species were placed individually in 45-ml petri dishes filled with filtered sea water and incubated at in situ temperature for 24 h in the dark. At the end of the experiment, eggs produced were counted. Gonad maturation was assessed on the females that did not spawn. The data set provides a time series of egg production rates (EPR), clutch size and gonad maturation index for the three dominant Arctic copepods. The primarily herbivorous copepods Calanus glacialis and C. hyperboreus and the omnivorous Metridia longa make up the bulk of zooplankton biomass in Arctic pelagic ecosystems. They play a crucial role in the trophic flux of energy through the pelagic food web and in the vertical transport of carbon during their ontogenic vertical migration. From studies conducted in the Greenland Sea and northern Norway, the two Calanidae are known to have evolved different reproductive strategies to deal with the strong seasonality of food availability. Despite its importance in Arctic zooplankton assemblages, the annual reproductive cycle of M. longa is hardly documented. This dataset is aimed at studying the reproductive biology of these three dominant copepods over an annual cycle in the Canadian Arctic waters of the Beaufort Sea.
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