Ocean-scale modelling of the distribution, abundance, and seasonal dynamics of the copepod Calanus finmarchicus

D. Speirs, W.S.C. Gurney, M.R. Heath, W. Horbelt, S.N. Wood, B. de Cuevas

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

The copepod Calanus finmarchicus is widely distributed over the sub-polar Atlantic and dominates the mesozooplanktonic biomass in that region. Despite this, all previous C. finmarchicus population modelling studies have been spatially and temporally limited. In this paper we present results from a fully stage-resolved model in a domain spanning the entire geographic range of the species (30 to 80°N and 80°W to 90° E. The model was driven by temperature and transport from the Ocean Circulation and Climate Advanced Modelling project (OCCAM) and phytoplankton food derived from satellite (SeaWiFS) sea-surface colour observations. The resulting quasi-stationary yearly cycle was assessed against seasonally resolved maps of continuous plankton recorder observations, winter cruise data on the distribution of diapausers, and time series from locations distributed over the North Atlantic. The model's high computational efficiency permitted its free parameters to be selected to yield a good correspondence with the field data. We were also able to explore the effects of changing the assumptions regarding diapause and mortality. By falsifying alternative models we conclude that (1) a fixed fraction of each surface generation enters diapause, (2) overwintering individuals enter diapause at the end of the fifth copepodite stage, and (3) mortality is an increasing function of temperature. Finally, we demonstrate that the demographic impact of transport is limited, except in shelf seas and at the edges of the distribution; nevertheless, there is a very high level of population connectivity over the whole domain.
LanguageEnglish
Pages173-192
Number of pages19
JournalMarine Ecology Progress Series
Volume313
DOIs
Publication statusPublished - 2006

Fingerprint

Calanus finmarchicus
diapause
Copepoda
oceans
ocean
modeling
population modeling
mortality
SeaWiFS
shelf sea
overwintering
connectivity
plankton
sea surface
temperature
phytoplankton
time series
food
distribution
time series analysis

Keywords

  • calanus finmarchicus
  • structured population model
  • diapause
  • temperature dependent mortality
  • CPR
  • OCCAM
  • SeaWiFS

Cite this

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abstract = "The copepod Calanus finmarchicus is widely distributed over the sub-polar Atlantic and dominates the mesozooplanktonic biomass in that region. Despite this, all previous C. finmarchicus population modelling studies have been spatially and temporally limited. In this paper we present results from a fully stage-resolved model in a domain spanning the entire geographic range of the species (30 to 80°N and 80°W to 90° E. The model was driven by temperature and transport from the Ocean Circulation and Climate Advanced Modelling project (OCCAM) and phytoplankton food derived from satellite (SeaWiFS) sea-surface colour observations. The resulting quasi-stationary yearly cycle was assessed against seasonally resolved maps of continuous plankton recorder observations, winter cruise data on the distribution of diapausers, and time series from locations distributed over the North Atlantic. The model's high computational efficiency permitted its free parameters to be selected to yield a good correspondence with the field data. We were also able to explore the effects of changing the assumptions regarding diapause and mortality. By falsifying alternative models we conclude that (1) a fixed fraction of each surface generation enters diapause, (2) overwintering individuals enter diapause at the end of the fifth copepodite stage, and (3) mortality is an increasing function of temperature. Finally, we demonstrate that the demographic impact of transport is limited, except in shelf seas and at the edges of the distribution; nevertheless, there is a very high level of population connectivity over the whole domain.",
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Ocean-scale modelling of the distribution, abundance, and seasonal dynamics of the copepod Calanus finmarchicus. / Speirs, D.; Gurney, W.S.C.; Heath, M.R.; Horbelt, W.; Wood, S.N.; de Cuevas, B.

In: Marine Ecology Progress Series, Vol. 313, 2006, p. 173-192.

Research output: Contribution to journalArticle

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AU - Speirs, D.

AU - Gurney, W.S.C.

AU - Heath, M.R.

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AU - Wood, S.N.

AU - de Cuevas, B.

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