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 & 15 others D.J. 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, NERC Marine Productivity Programme (Funder), The Scottish Executive Environment and Rural Affairs Department (Funder)

Research output: Contribution to journalArticle

39 Citations (Scopus)

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 G0 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 G0 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.
LanguageEnglish
Pages39-88
Number of pages49
JournalProgress in Oceanography
Volume76
Issue number1
DOIs
Publication statusPublished - 31 Jan 2008

Fingerprint

Calanus finmarchicus
demography
basins
plankton
overwintering
population dynamics
demographic statistics
climate
basin
production economics
Greenland
surface water
Copepoda
mortality
developmental stages
predation
North Atlantic Oscillation
sea
developmental stage
summer

Keywords

  • plankton
  • oceanography
  • Atlantic Ocean
  • Greenland
  • opepods
  • mortality
  • feeding
  • calanus finmarchicus
  • irminger sea

Cite this

Heath, M. R., Rasmussen, J., Ahmed, Y., Allen, J., Anderson, C. I. H., Brierley, A. S., ... The Scottish Executive Environment and Rural Affairs Department (Funder) (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
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, D.J. ; 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. ; NERC Marine Productivity Programme (Funder) ; The Scottish Executive Environment and Rural Affairs Department (Funder). / 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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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, NERC Marine Productivity Programme (Funder) & The Scottish Executive Environment and Rural Affairs Department (Funder) 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

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, D.J.; 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.; NERC Marine Productivity Programme (Funder); The Scottish Executive Environment and Rural Affairs Department (Funder).

In: Progress in Oceanography, Vol. 76, No. 1, 31.01.2008, p. 39-88.

Research output: Contribution to journalArticle

TY - JOUR

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, D.J.

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.

AU - NERC Marine Productivity Programme (Funder)

AU - The Scottish Executive Environment and Rural Affairs Department (Funder)

PY - 2008/1/31

Y1 - 2008/1/31

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 G0 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 G0 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.

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 G0 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 G0 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.

KW - plankton

KW - oceanography

KW - Atlantic Ocean

KW - Greenland

KW - opepods

KW - mortality

KW - feeding

KW - calanus finmarchicus

KW - irminger sea

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

T2 - Progress in Oceanography

JF - Progress in Oceanography

SN - 0079-6611

IS - 1

ER -

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 31;76(1):39-88. https://doi.org/10.1016/j.pocean.2007.10.001