Year-to-year changes in abundance of the copepod Calanus finmarchicus
in the North Atlantic are studied by means of the Continuous Plankton
Recorder (CPR). Using data collected during the years 1962 to 1974, th
e spatial heterogeneity of long-term trends is studied by numerical an
alysis: Mantel test, Mantel correlogram, and spatio-temporal clusterin
g. Results reveal that (1) interannual changes of C. finmarchicus abun
dance are spatially autocorrelated; (2) the spatial structures have a
radius varying between 400 and 1100 km; and (3) there is a high variab
ility in the annual changes observed between the different zones detec
ted by clustering. These results show that observations made in the No
rtheast Atlantic cannot be extrapolated to the whole North Atlantic ba
sin, and suggest that identification of the size and location of an ''
homogeneous zone for long-term changes'' should be taken into account
when determining factors responsible for year-to-year fluctuations in
abundance of C. finmarchicus.