Journal Title
Title of Journal: Mar Biol
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Abbravation: Marine Biology
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Publisher
Springer Berlin Heidelberg
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Authors: A Schiariti A D Berasategui D A Giberto R A Guerrero E M Acha H W Mianzan
Publish Date: 2006/02/01
Volume: 149, Issue: 3, Pages: 483-489
Abstract
The Río de la Plata is one of the main estuarine systems of South America It is characterized by a salt wedge regime a welldeveloped bottom salinity front and a maximum turbidity zone associated with it We described for the first time the spatial distributional patterns of Neomysis americana the most abundant mysid and the main food item for juvenile fishes in this estuary We analyzed the link between mysid distribution and abundance and the bottom salinity gradient A total of 242 plankton samples were taken from the Río de la Plata estuary in spring and fall between 1991 and 2001 Bottom salinity gradient was quantified from grids created on the basis of 348 oceanographic stations The N americana population was characterized by high abundances up to 2500 ind m−3 with juveniles males gravid and nongravid females present in both spring and fall of different years N americana distribution followed the position of the bottom salinity front in different years and seasons Pearson’s correlation analysis between mysid abundance and bottom salinity gradient confirmed the association of mysids with the bottom salinity front maximum salinity gradient No correlation was detected between mysid abundance and salinity per se or temperature neither in spring nor in fall We speculate that mysids concentrated at the front could take advantage of the high concentration of detrital material for feeding The results of our work highlight the importance of the magnitude of salinity gradient for the ecological processes of a saltwedge estuary like the Río de la Plata The analysis of the spatial distribution of gradient values presented in this work also constitutes a useful tool to locate key ecological areas such as frontsWe would like to thank to MC Rodríguez and J Dadón for their helpful comments on the manuscript to MD Viñas for their assistance and to FC Ramírez for their help on the mysid species identification Satellite image was acquired by the CONAE Falda del Carmen Córdoba Argentina and processed by DA Gagliardini This work was partially supported by UNMdP EXA 277/03 Fundación Antorchas N° 1390013 Agencia PICT 2000 N° 0708424 and PICT 2003 N° 0713659 CONICET PIP 5009 This is INIDEP contribution N° 1365
Keywords:
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