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Journal of Plankton Research, Vol 21, 1977-1991, Copyright © 1999 by Oxford University Press
E Garces, M Delgado, M Maso and J Camp
Gyrodinium corsicum Paulmier produced massive blooms
in Alfacs Bay (Ebro Delta, NW Mediterranean Sea) from December 1994 to
April 1995, a period characterized by an initial period of water stability
and low outward flux of water during subsequent months. The highest cell
densities of G.corsicum were found at the bottom of
the bay during the population maintenance period (from January to March).
During the day, no differences in the vertical distribution of
G.corsicum were observed and no diel in
situ vertical migration of the population was recorded. The
in situ growth rate of G.corsicum
was estimated using the cell cycle method since the cell division cycle was
well phased with the daily light cycle. The S phase fraction of
G.corsicum reached a maximum near the middle of the
dark period. The G2M peak usually occurred in the dark period. The duration
of the S phase was 2.1-8.7 h and the duration of the G2M phase was 2.6-7.7
h. The estimated specific in situ growth rate of
G.corsicum ranged from 0.94
day-1 during the initial phases of the bloom to 0.3
day-1 when the bloom was well developed. Growth
rates, measured in different locations at the same time, varied by a factor
of 1.5, suggesting that different parts of the same blooming population
were at different stages of growth. The persistence of the
G.corsicum bloom with high cell densities
(105-106 cells
l-1) at the bottom of the bay is discussed in
relation to the low cell losses by physical dispersion in this area and the
lack of upward vertical migration of G.corsicum.
ORIGINAL ARTICLES
In situ growth rate and distribution of the ichthyotoxic dinoflagellate Gyrodinium corsicum Paulmier in an estuarine embayment (Alfacs Bay, NW Mediterranean Sea)
Institut de Ciències del Mar, P/Joan de Borbó, s/n, 08039 Barcelona, Spain
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