Madsen, S.D., T.G. Nielsen & B.W. Hansen. (2001). Annual population development and production by Calanus finmarchicus, C. glacialis and C. hyperboreus in Disko Bay, western Greenland. Marine Biology, Berlin 139(1):75-93.

100835

Madsen, S.D., T.G. Nielsen & B.W. Hansen

2001

139(1):75-93.

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The populations of the copepod species Calanus ®nmarchicus, C. glacialis and C. hyperboreus were investigated in Disko Bay during a 14-month period in 1996± 1997. The three species were predominant in the copepod community. The biomass reached a maximum at the beginningof June (127 mg Cm±3 ). From theend of July until the end of April the following year, the biomass was <1±6 mg C m±3 . All three species showed seasonal ontogenetic migration. The spring ascent for all three species was just prior to or in association with the break-up of sea ice and the development of the spring bloom, whereas descent occurred over a larger time span during summer. The main overwintering stages were CV for C. ®nmarchicus, CIV and CV for C. glacialis and C. hyperboreus. Peak abundance of juvenile copepodites, representing the new generation, was in August for C. ®nmarchicus, in July for C. glacialis and in May/June for C. hyperboreus. From the timing of reproduction and the population development, the life cycles were deduced to be 1 year for C. ®nmarchicus and at least 2 years for C. glacialis and C. hyperboreus. Secondary production and potential grazing impact of the Calanus community were estimated by two methods based on speci®c egg-production rates and temperature-dependent production. The Calanus community was not able to control the primary producers during the spring bloom but probably did during postbloom. The estimates also indicated that grazing on ciliates and heterotrophic dino¯agellates contributes as an essential food source in the post-bloom period.

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