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Marine Biology

, Volume 139, Issue 1, pp 75–93 | Cite as

Annual population development and production by Calanus finmarchicus, C. glacialis and C. hyperboreus in Disko Bay, western Greenland

Abstract.

The populations of the copepod species Calanus finmarchicus, 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 beginning of June (127 mg C m–3). From the end 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. finmarchicus, CIV and CV for C. glacialis and C. hyperboreus. Peak abundance of juvenile copepodites, representing the new generation, was in August for C. finmarchicus, 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. finmarchicus 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 specific 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 post-bloom. The estimates also indicated that grazing on ciliates and heterotrophic dinoflagellates contributes as an essential food source in the post-bloom period.

Keywords

Biomass Dinoflagellate Spring Bloom Secondary Production Population Development 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

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    • 1
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    • 2
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    • 1
  1. 1.Department of Life Sciences and Chemistry, Roskilde University, PO Box 260, 4000 Roskilde, Denmark
  2. 2.Department of Marine Ecology, National Environmental Research Institute, PO Box 358, Frederiksborgvej 399, 4000 Roskilde, Denmark

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