INVESTIGADORES
PERILLO Gerardo Miguel E.
artículos
Título:
Biomass and microzooplankton seasonal assemblages in the Bahı´a Blanca Estuary, Argentinean Coast
Autor/es:
BARRÍA DE CAO, M.S.; PICCOLO, M.C.; PERILLO, G.M.E.
Revista:
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
Editorial:
CAMBRIDGE UNIV PRESS
Referencias:
Lugar: Cambridge; Año: 2011 vol. 91 p. 953 - 959
ISSN:
0025-3154
Resumen:
We investigated the occurrence and seasonal variation of the biomass of rotifers, tintinnids, the heterotrophic dinoflagellate
Gyrodinium fusus and copepod nauplii in the Bahı´a Blanca Estuary (38842′S61850 ′W), Argentina, during an annual cycle.
The rotifers fauna comprised three species, while the tintinnids were represented by sixteen species. The biomass of the rotifers
fluctuated between 0.62 and 8.90 mgC l21. The biomass of the tintinnids fluctuated between 0.13 and 9.37 mgC l21, the
biomass of the nauplii stages between 1.78 and 7.65 mgC l21; while the biomass of G. fusus varied from 0.26 and
7.94 mgC l21, these results are compared to estimates of microzooplankton in other regions. We analysed the presence of
the different groups in relation to the environmental variables, based on point-biserial correlation. Salinity fluctuated
between 25.14 and 36.64; temperature between 7.5 and 23.28C, solar radiation between 0.9 and 30.8 MJ m22d21 and
Secchi distance between 0.25 and 1.43 m. Rotifers were correlated positively with temperature, chlorophyll-a and Secchi
depth and negatively with salinity. The tintinnids were positively correlated with salinity. Gyrodinium fusus was positively
correlated with Secchi depth, and chlorophyll-a, and negatively with temperature and solar radiation. Nauplii stages were
negatively correlated with chlorophyll-a. Based on the occurrence of the microzooplankters in relation to the physico-chemical
variables, it was possible to establish two seasonal assemblages: (a) the co-occurrence of the rotifers and the heterotrophic
dinoflagellate G. fusus during the winter?spring; and (b) the tintinnids and nauplii larvae during the summer. We conclude
that, in this estuary, physico-chemical variables are the forcing factors that directly, or indirectly, influence the seasonal
assemblages of the microzooplankton.