Spatial demography of Calanus finmarchicus in the Irminger Sea

M. R. Heath, J. Rasmussen, Y. Ahmed, J. Allen, C. I. H. Anderson, A. S. Brierley, L. Brown, A. Bunker, K. Cook, R. Davidson, S. Fielding, W. S. C. Gurney, R. Harris, S. Hay, S. Henson, A. G. Hirst, N. P. Holliday, A. Ingvarsdottir, X. Irigoien, P. Lindeque & 13 others Daniel Justin Mayor, D. Montagnes, C. Moffat, R. Pollard, S. Richards, R. A. Saunders, J. Sidey, G. Smerdon, D. Speirs, P. Walsham, J. Waniek, L. Webster, D. Wilson

Research output: Contribution to journalArticle

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Abstract

Continuous Plankton Recorder data suggest that the Irminger Sea supports a major proportion of the surface-living population of the copepod Calanus finmarchicus in the northern North Atlantic, but there have been few studies of its population dynamics in the region. In this paper, we document the seasonal changes in the demographic structure of C finmarchicus in the Irminger Sea from a field programme during 2001/2002, and the associations between its developmental stages and various apparent bio-physical zones. Overwintering stages were found widely at depth (>500 m) across the Irminger Sea, and surviving females were widely distributed in the surface waters the following spring. However, recruitment of the subsequent generation was concentrated around the fringes of the Irminger Sea basin, along the edges of the Irminger and East Greenland Currents, and not in the central basin. In late summer animals were found descending back to overwintering depths in the Central Irminger Sea. The key factors dictating this pattern of recruitment appear to be (a) the general circulation regime, (b) predation on eggs in the spring, possibly by the surviving GO stock, and (c) mortality of first feeding naupliar stages in the central basin where food concentrations appear to be low throughout the year.

We compared the demographic patterns in 2001/2002 with observations from the only previous major survey in 1963 and with data from the Continuous Plankton Recorder (CPR) surveys. In both previous data sets, the basic structure of GO ascent from the central basin and G1 recruitment around the fringes was a robust feature, suggesting that it is a recurrent phenomenon. The Irminger Sea is a complex mixing zone between polar and Atlantic water masses, and it has also been identified as a site of sporadic deep convection. The physical oceanographic characteristics of the region are therefore potentially sensitive to climate fluctuations. Despite this, the abundance of C finmarchicus in the region, as measured by the CPR surveys, appears not to have responded to climate factors linked to the North Atlantic Oscillation Index, in contrast with the stocks in eastern Atlantic areas. We speculate that this may because biological factors (production and mortality), rather than transport processes are the key factors affecting the population dynamics in the Irminger Sea. (c) 2007 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)39-88
Number of pages50
JournalProgress in Oceanography
Volume76
Issue number1
DOIs
Publication statusPublished - Jan 2008

Keywords

  • plankton
  • oceanography
  • Atlantic Ocean
  • Greenland
  • copepods
  • mortality
  • feeding
  • North-Atlantic oscillation
  • plankton recorder survey
  • stage-specific mortality
  • scale physical controls
  • frequency time-series
  • egg-production
  • labrador sea
  • life-cycle
  • hatching success
  • fatty-acids

Cite this

Heath, M. R., Rasmussen, J., Ahmed, Y., Allen, J., Anderson, C. I. H., Brierley, A. S., ... Wilson, D. (2008). Spatial demography of Calanus finmarchicus in the Irminger Sea. Progress in Oceanography, 76(1), 39-88. https://doi.org/10.1016/j.pocean.2007.10.001

Spatial demography of Calanus finmarchicus in the Irminger Sea. / Heath, M. R.; Rasmussen, J.; Ahmed, Y.; Allen, J.; Anderson, C. I. H.; Brierley, A. S.; Brown, L.; Bunker, A.; Cook, K.; Davidson, R.; Fielding, S.; Gurney, W. S. C.; Harris, R.; Hay, S.; Henson, S.; Hirst, A. G.; Holliday, N. P.; Ingvarsdottir, A.; Irigoien, X.; Lindeque, P.; Mayor, Daniel Justin; Montagnes, D.; Moffat, C.; Pollard, R.; Richards, S.; Saunders, R. A.; Sidey, J.; Smerdon, G.; Speirs, D.; Walsham, P.; Waniek, J.; Webster, L.; Wilson, D.

In: Progress in Oceanography, Vol. 76, No. 1, 01.2008, p. 39-88.

Research output: Contribution to journalArticle

Heath, MR, Rasmussen, J, Ahmed, Y, Allen, J, Anderson, CIH, Brierley, AS, Brown, L, Bunker, A, Cook, K, Davidson, R, Fielding, S, Gurney, WSC, Harris, R, Hay, S, Henson, S, Hirst, AG, Holliday, NP, Ingvarsdottir, A, Irigoien, X, Lindeque, P, Mayor, DJ, Montagnes, D, Moffat, C, Pollard, R, Richards, S, Saunders, RA, Sidey, J, Smerdon, G, Speirs, D, Walsham, P, Waniek, J, Webster, L & Wilson, D 2008, 'Spatial demography of Calanus finmarchicus in the Irminger Sea', Progress in Oceanography, vol. 76, no. 1, pp. 39-88. https://doi.org/10.1016/j.pocean.2007.10.001
Heath MR, Rasmussen J, Ahmed Y, Allen J, Anderson CIH, Brierley AS et al. Spatial demography of Calanus finmarchicus in the Irminger Sea. Progress in Oceanography. 2008 Jan;76(1):39-88. https://doi.org/10.1016/j.pocean.2007.10.001
Heath, M. R. ; Rasmussen, J. ; Ahmed, Y. ; Allen, J. ; Anderson, C. I. H. ; Brierley, A. S. ; Brown, L. ; Bunker, A. ; Cook, K. ; Davidson, R. ; Fielding, S. ; Gurney, W. S. C. ; Harris, R. ; Hay, S. ; Henson, S. ; Hirst, A. G. ; Holliday, N. P. ; Ingvarsdottir, A. ; Irigoien, X. ; Lindeque, P. ; Mayor, Daniel Justin ; Montagnes, D. ; Moffat, C. ; Pollard, R. ; Richards, S. ; Saunders, R. A. ; Sidey, J. ; Smerdon, G. ; Speirs, D. ; Walsham, P. ; Waniek, J. ; Webster, L. ; Wilson, D. / Spatial demography of Calanus finmarchicus in the Irminger Sea. In: Progress in Oceanography. 2008 ; Vol. 76, No. 1. pp. 39-88.
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T1 - Spatial demography of Calanus finmarchicus in the Irminger Sea

AU - Heath, M. R.

AU - Rasmussen, J.

AU - Ahmed, Y.

AU - Allen, J.

AU - Anderson, C. I. H.

AU - Brierley, A. S.

AU - Brown, L.

AU - Bunker, A.

AU - Cook, K.

AU - Davidson, R.

AU - Fielding, S.

AU - Gurney, W. S. C.

AU - Harris, R.

AU - Hay, S.

AU - Henson, S.

AU - Hirst, A. G.

AU - Holliday, N. P.

AU - Ingvarsdottir, A.

AU - Irigoien, X.

AU - Lindeque, P.

AU - Mayor, Daniel Justin

AU - Montagnes, D.

AU - Moffat, C.

AU - Pollard, R.

AU - Richards, S.

AU - Saunders, R. A.

AU - Sidey, J.

AU - Smerdon, G.

AU - Speirs, D.

AU - Walsham, P.

AU - Waniek, J.

AU - Webster, L.

AU - Wilson, D.

PY - 2008/1

Y1 - 2008/1

N2 - Continuous Plankton Recorder data suggest that the Irminger Sea supports a major proportion of the surface-living population of the copepod Calanus finmarchicus in the northern North Atlantic, but there have been few studies of its population dynamics in the region. In this paper, we document the seasonal changes in the demographic structure of C finmarchicus in the Irminger Sea from a field programme during 2001/2002, and the associations between its developmental stages and various apparent bio-physical zones. Overwintering stages were found widely at depth (>500 m) across the Irminger Sea, and surviving females were widely distributed in the surface waters the following spring. However, recruitment of the subsequent generation was concentrated around the fringes of the Irminger Sea basin, along the edges of the Irminger and East Greenland Currents, and not in the central basin. In late summer animals were found descending back to overwintering depths in the Central Irminger Sea. The key factors dictating this pattern of recruitment appear to be (a) the general circulation regime, (b) predation on eggs in the spring, possibly by the surviving GO stock, and (c) mortality of first feeding naupliar stages in the central basin where food concentrations appear to be low throughout the year.We compared the demographic patterns in 2001/2002 with observations from the only previous major survey in 1963 and with data from the Continuous Plankton Recorder (CPR) surveys. In both previous data sets, the basic structure of GO ascent from the central basin and G1 recruitment around the fringes was a robust feature, suggesting that it is a recurrent phenomenon. The Irminger Sea is a complex mixing zone between polar and Atlantic water masses, and it has also been identified as a site of sporadic deep convection. The physical oceanographic characteristics of the region are therefore potentially sensitive to climate fluctuations. Despite this, the abundance of C finmarchicus in the region, as measured by the CPR surveys, appears not to have responded to climate factors linked to the North Atlantic Oscillation Index, in contrast with the stocks in eastern Atlantic areas. We speculate that this may because biological factors (production and mortality), rather than transport processes are the key factors affecting the population dynamics in the Irminger Sea. (c) 2007 Elsevier Ltd. All rights reserved.

AB - Continuous Plankton Recorder data suggest that the Irminger Sea supports a major proportion of the surface-living population of the copepod Calanus finmarchicus in the northern North Atlantic, but there have been few studies of its population dynamics in the region. In this paper, we document the seasonal changes in the demographic structure of C finmarchicus in the Irminger Sea from a field programme during 2001/2002, and the associations between its developmental stages and various apparent bio-physical zones. Overwintering stages were found widely at depth (>500 m) across the Irminger Sea, and surviving females were widely distributed in the surface waters the following spring. However, recruitment of the subsequent generation was concentrated around the fringes of the Irminger Sea basin, along the edges of the Irminger and East Greenland Currents, and not in the central basin. In late summer animals were found descending back to overwintering depths in the Central Irminger Sea. The key factors dictating this pattern of recruitment appear to be (a) the general circulation regime, (b) predation on eggs in the spring, possibly by the surviving GO stock, and (c) mortality of first feeding naupliar stages in the central basin where food concentrations appear to be low throughout the year.We compared the demographic patterns in 2001/2002 with observations from the only previous major survey in 1963 and with data from the Continuous Plankton Recorder (CPR) surveys. In both previous data sets, the basic structure of GO ascent from the central basin and G1 recruitment around the fringes was a robust feature, suggesting that it is a recurrent phenomenon. The Irminger Sea is a complex mixing zone between polar and Atlantic water masses, and it has also been identified as a site of sporadic deep convection. The physical oceanographic characteristics of the region are therefore potentially sensitive to climate fluctuations. Despite this, the abundance of C finmarchicus in the region, as measured by the CPR surveys, appears not to have responded to climate factors linked to the North Atlantic Oscillation Index, in contrast with the stocks in eastern Atlantic areas. We speculate that this may because biological factors (production and mortality), rather than transport processes are the key factors affecting the population dynamics in the Irminger Sea. (c) 2007 Elsevier Ltd. All rights reserved.

KW - plankton

KW - oceanography

KW - Atlantic Ocean

KW - Greenland

KW - copepods

KW - mortality

KW - feeding

KW - North-Atlantic oscillation

KW - plankton recorder survey

KW - stage-specific mortality

KW - scale physical controls

KW - frequency time-series

KW - egg-production

KW - labrador sea

KW - life-cycle

KW - hatching success

KW - fatty-acids

U2 - 10.1016/j.pocean.2007.10.001

DO - 10.1016/j.pocean.2007.10.001

M3 - Article

VL - 76

SP - 39

EP - 88

JO - Progress in Oceanography

JF - Progress in Oceanography

SN - 0079-6611

IS - 1

ER -