Understanding demography in an advective environment: Modelling Calanus finmarchicus in the Norwegian Sea

D. Speirs, W.S.C. Gurney, S.J. Holmes, M.R. Heath, S.N. Wood, E.D. Clarke, I.H. Harms, H. Hirche, E. McKenzie

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Attempts to understand the demography of natural populations from time-series can be hampered by the fact that changes due to births and deaths may be confounded with those due to movement in and out of the sampling area. We illustrate the problem using a stage-structured time-series of the marine copepod Calanus finmarchicus sampled in the vicinity of a fixed location but where the demography is shown to be inconsistent with the assumption of a closed population. Using an empirical relationship between C. finmarchicus egg production and the abundance of phytoplanktonic food, the spatio-temporal patterns in chlorophyll a can be inferred. The distributions during the spring bloom are spatially heterogeneous, and we estimate that the phytoplankton patches are of the order of 30 km across. This result is robust to substantial variations in the assumed stage-dependent mortalities. We conclude that information on advective transport can be used to make testable predictions about the scale of spatial heterogeneities. These, in turn, imply the appropriate spatial scale over which time-series might be replicated in order to obtain more information about unknown processes such as mortality.
LanguageEnglish
Pages897-910
Number of pages13
JournalJournal of Animal Ecology
Volume73
DOIs
Publication statusPublished - 2004

Fingerprint

Calanus finmarchicus
demography
time series analysis
time series
modeling
mortality
egg production
chlorophyll a
Copepoda
algal bloom
advection
phytoplankton
death
chlorophyll
prediction
food
sampling
Norwegian Sea
sea

Keywords

  • ecology
  • oceanography
  • fish
  • marine environment
  • calanus finmarchicus

Cite this

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Understanding demography in an advective environment: Modelling Calanus finmarchicus in the Norwegian Sea. / Speirs, D.; Gurney, W.S.C.; Holmes, S.J.; Heath, M.R.; Wood, S.N.; Clarke, E.D.; Harms, I.H.; Hirche, H.; McKenzie, E.

In: Journal of Animal Ecology, Vol. 73, 2004, p. 897-910.

Research output: Contribution to journalArticle

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AU - Gurney, W.S.C.

AU - Holmes, S.J.

AU - Heath, M.R.

AU - Wood, S.N.

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