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Journal of Plankton Research, Vol 21, 1133-1152, Copyright © 1999 by Oxford University Press
E Gaard
The Faroe shelf water is separated from the offshore water by a persistent
tidal front, which surrounds the islands. This shelf water contains a
neritic zooplankton community, which, regarding species composition,
production, seasonal development and environmental conditions, is quite
different from that in the surrounding ocean. While during spring and
summer the zooplankton in the oceanic environment are dominated by the
copepod Calanus finmarchicus, the zooplankton in the
shelf water are largely dominated by neritic copepods, mainly
Acartia longiremis and Temora longicornis.
Calanus finmarchicus occurs in interannually highly variable
abundance in the Faroe shelf ecosystem. Meroplanktonic larvae, mainly
Balanus spp, and decapod larvae, are also common in
the shelf water during spring and summer. During the period presented
(1989-1997), the Faroe shelf ecosystem has undergone very large changes in
abundance of different zooplankton species. The midsummer abundance of
C.finmarchicus, which originally is advected into the
shelf from the open ocean, fluctuated from
ORIGINAL ARTICLES
The zooplankton community structure in relation to its biological and physical environment on the Faroe shelf, 1989-1997
Fisheries Laboratory of the Faroes, Nóatún, PO Box 3051, FO-110 Tórhsavn, Faroe Islands
400 copepods
m-3 in 1989 to 25 copepods
m-3 in 1994, and at the same time the neritic
zooplankton increased from 120 m-3 in 1989
to 450 m-3 in 1994. Consequently, the midsummer
biomass in the shelf fluctuated by a factor of 10 during the same period.
It is presumed that this variability between oceanic- and neritic-dominated
zooplankton, their sizes and their biomass has greatly affected the entire
pelagic ecosystem.
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