Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge. / Jonasdottir, Sigrun; Richardson, K.; Heath, M.R.; Ingvardsdottir, A.; Christoffersen, Alice.

In: Deep Sea Research - Part I - Oceanographic Research Papers, Vol. 55, No. 4, 2008, p. 471-489.

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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Author

Jonasdottir, Sigrun; Richardson, K.; Heath, M.R.; Ingvardsdottir, A.; Christoffersen, Alice / Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge.

In: Deep Sea Research - Part I - Oceanographic Research Papers, Vol. 55, No. 4, 2008, p. 471-489.

Publication: Research - peer-reviewJournal article – Annual report year: 2008

Bibtex

@article{5a0598add3ef42d998ddf2775c0ec1c4,
title = "Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge",
keywords = "Erhvervsfiskeri",
publisher = "Pergamon",
author = "Sigrun Jonasdottir and K. Richardson and M.R. Heath and A. Ingvardsdottir and Alice Christoffersen",
year = "2008",
doi = "10.1016/j.dsr.2007.12.009",
volume = "55",
number = "4",
pages = "471--489",
journal = "Deep Sea Research - Part I - Oceanographic Research Papers",
issn = "0967-0637",

}

RIS

TY - JOUR

T1 - Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge

A1 - Jonasdottir,Sigrun

A1 - Richardson,K.

A1 - Heath,M.R.

A1 - Ingvardsdottir,A.

A1 - Christoffersen,Alice

AU - Jonasdottir,Sigrun

AU - Richardson,K.

AU - Heath,M.R.

AU - Ingvardsdottir,A.

AU - Christoffersen,Alice

PB - Pergamon

PY - 2008

Y1 - 2008

N2 - 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

AB - 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

KW - Erhvervsfiskeri

U2 - 10.1016/j.dsr.2007.12.009

DO - 10.1016/j.dsr.2007.12.009

JO - Deep Sea Research - Part I - Oceanographic Research Papers

JF - Deep Sea Research - Part I - Oceanographic Research Papers

SN - 0967-0637

IS - 4

VL - 55

SP - 471

EP - 489

ER -