Skip Navigation

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (10)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Astthorsson, O. S.
Right arrow Articles by Gislason, A.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Astthorsson, O. S.
Right arrow Articles by Gislason, A.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Plankton Research Vol.25 no.7 pp.843-854, 2003
© Oxford University Press 2003

Seasonal variations in abundance, development and vertical distribution of Calanus finmarchicus, C. hyperboreus and C. glacialis in the East Icelandic Current

Olafur S. Astthorsson* and Astthor Gislason1

Marine Research Institute, PO Box 1390, Skulagata 4, 121 Reykjavik, Iceland

* Corresponding Author: osa{at}hafro.is

The seasonal variation in abundance and development of Calanus finmarchicus, Calanus hyperboreus and Calanus glacialis in relation to hydrography and chlorophyll (Chl) a was studied in the Arctic waters of the East Icelandic Current to the north-east of Iceland from March 1995 to February 1996. The sampling was carried out at approximately monthly intervals on a transect of five stations extending from 67°00'N, 13°55'W to 68°00'N, 12°40'W. In April, May and June, vertical distribution was also investigated. Spring warming of the surface waters began in May, with maximum temperatures recorded in August (~5°C, mean for uppermost 50 m). Below 75 m, temperature remained at <0°C throughout the year. The spring bloom of phytoplankton started in early May and the highest Chl a concentrations were measured during late May to early June (~1 mg Chl a m-3). Calanus finmarchicus dominated in terms of numbers (~75%), while C. hyperboreus dominated biomass (~76%). Calanus glacialis occurred only in low numbers (~1%) and was only a small portion of biomass (~0.7%). The abundance of all species was low during the winter and peaked once during summer: C. finmarchicus in July (~16 000 ind. m-2) and C. glacialis and C. hyperboreus in June (~370 and ~7700 ind. m-2, respectively). The biomass of C. finmarchicus had two maxima, in April (~1.9 g m-2) and July (~1.5 g m-2), while C. hyperboreus peaked in June (~12.3 g m-2). Calanus finmarchicus was estimated to spawn in early May at about the start of the spring bloom, while C. hyperboreus spawned prior to the spring bloom, in late February to early March. On the basis of copepod stage distribution, C. finmarchicus was considered to have a 1-year life cycle and C. hyperboreus at least a 2-year life cycle.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.