Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge
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-Sc...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2008
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Online Access: | https://orbit.dtu.dk/en/publications/5a0598ad-d3ef-42d9-98dd-f2775c0ec1c4 https://doi.org/10.1016/j.dsr.2007.12.009 |
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ftdtupubl:oai:pure.atira.dk:publications/5a0598ad-d3ef-42d9-98dd-f2775c0ec1c4 2023-05-15T15:47:57+02:00 Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge Jonasdottir, Sigrun Richardson, K. Heath, M.R. Ingvardsdottir, A. Christoffersen, Alice 2008 https://orbit.dtu.dk/en/publications/5a0598ad-d3ef-42d9-98dd-f2775c0ec1c4 https://doi.org/10.1016/j.dsr.2007.12.009 eng eng info:eu-repo/semantics/restrictedAccess Jonasdottir , S , Richardson , K , Heath , M R , Ingvardsdottir , A & Christoffersen , A 2008 , ' Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge ' , Deep Sea Research - Part I - Oceanographic Research Papers , vol. 55 , no. 4 , pp. 471-489 . https://doi.org/10.1016/j.dsr.2007.12.009 Erhvervsfiskeri article 2008 ftdtupubl https://doi.org/10.1016/j.dsr.2007.12.009 2023-02-08T23:52:56Z 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 (>30áeggsáfemale-1ád-1) and lowest in the Iceland Basin (10áeggsáfemale-1ád-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 1á[mu]gáL-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 Article in Journal/Newspaper Calanus finmarchicus Iceland Technical University of Denmark: DTU Orbit Faroe Shelf ENVELOPE(-6.000,-6.000,62.000,62.000) Deep Sea Research Part I: Oceanographic Research Papers 55 4 471 489 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Erhvervsfiskeri |
spellingShingle |
Erhvervsfiskeri Jonasdottir, Sigrun Richardson, K. Heath, M.R. Ingvardsdottir, A. Christoffersen, Alice Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge |
topic_facet |
Erhvervsfiskeri |
description |
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 (>30áeggsáfemale-1ád-1) and lowest in the Iceland Basin (10áeggsáfemale-1ád-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 1á[mu]gáL-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 |
format |
Article in Journal/Newspaper |
author |
Jonasdottir, Sigrun Richardson, K. Heath, M.R. Ingvardsdottir, A. Christoffersen, Alice |
author_facet |
Jonasdottir, Sigrun Richardson, K. Heath, M.R. Ingvardsdottir, A. Christoffersen, Alice |
author_sort |
Jonasdottir, Sigrun |
title |
Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge |
title_short |
Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge |
title_full |
Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge |
title_fullStr |
Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge |
title_full_unstemmed |
Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge |
title_sort |
spring production of calanus finmarchicus at the iceland-scotland ridge |
publishDate |
2008 |
url |
https://orbit.dtu.dk/en/publications/5a0598ad-d3ef-42d9-98dd-f2775c0ec1c4 https://doi.org/10.1016/j.dsr.2007.12.009 |
long_lat |
ENVELOPE(-6.000,-6.000,62.000,62.000) |
geographic |
Faroe Shelf |
geographic_facet |
Faroe Shelf |
genre |
Calanus finmarchicus Iceland |
genre_facet |
Calanus finmarchicus Iceland |
op_source |
Jonasdottir , S , Richardson , K , Heath , M R , Ingvardsdottir , A & Christoffersen , A 2008 , ' Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge ' , Deep Sea Research - Part I - Oceanographic Research Papers , vol. 55 , no. 4 , pp. 471-489 . https://doi.org/10.1016/j.dsr.2007.12.009 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2007.12.009 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
55 |
container_issue |
4 |
container_start_page |
471 |
op_container_end_page |
489 |
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1766382933094957056 |