IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
Brazilian Journal of Oceanography
Autor/es:
GUINDER, V.A.; POPOVICH, C.A.; PERILLO, G.M.E.
Revista:
Brazilian Journal of Oceanography
Editorial:
Universidade de São Paulo
Referencias:
Lugar: Sao Paulo; Año: 2009 vol. 57 p. 249 - 258
ISSN:
1679-8759
Resumen:
Hydrological processes such as advection,
resuspension, estuarine circulation, internal waves,
tidal stirring, vertical mixing and stratification are the
main physical forces affecting the phytoplankton
distribution in estuaries (DENMAN; GARGETT,
1983; CLOERN et al., 1989; CUSHING 1989; DE
JONGE; VAN BEUSEKOM, 1992). Vertical and
horizontal transport of phytoplankton in coastal areas
could be induced by winds, water mass intrusions
from the open sea, turbulence, freshwater inflow and
tides (CLOERN et al., 1989; LI; SMAYDA, 2001;
BRUNET; LIZON, 2003; HAGY III et al., 2005;
POPOVICH; MARCOVECCHIO, 2008; POPOVICH
et al., 2008b) and these sorts of transport are related to
biomass accumulation and dispersion. Many studies
have revealed intratidal variations in phytoplankton
dynamics (e.g. DEMERS; LEGENDRE, 1979;
DEMERS et al., 1986; DUSTAN; PINCKNEY, 1989;
BRUNET; LIZON, 2003) and even differences in
biomass between micro and macrotidal estuaries
(MONBET, 1992). Moreover, phytoplankton
patchiness in estuaries has been associated with the
physical influence of tides (DUSTAN; PINCKNEY,
1989). In estuaries characterized by high-tidal energy,
a steady phytoplankton composition over short time
periods might be expected owing to the intense mixing
processes continuously occurring in the water column.
However, heterogeneous distributions of
phytoplankton cells in the water column on different
temporal and spatial scales have been observed (e.g.
CUSHING, 1989; BRUNET; LIZON, 2003). Many
studies have used the biomass (estimated by the
chlorophyll a concentration) as the main intrinsic
property to describe the phytoplankton community
dynamics during tidal cycles (DENMAN, 1977;
FRÉCHETTE; LEGENDRE, 1982, CLOERN et al.,
1989; DUSTAN; PINCKNEY, 1989; MONBET
1992), without taking into consideration the speciesspecific
patterns related to these regular short-time
events. Hence, studies based only on phytoplankton
biomass variability throughout tidal cycles may
overlook the short-term temporal changes in the
species composition.