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JOURNAL OF PLANKTON RESEARCH | VOLUME 25 | NUMBER 12 | PAGES 1551-1559 | 2003
© Oxford University Press; all rights reserved

First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary

Demetrio Boltovskoy1,2,3,*, Mariela Kogan1,2,4, Viviana A. Alder1,2,5 and Hermes Mianzan2,4

1 Departamento De Ecología, Genética Y Evolución, Facultad De Ciencias Exactas Y Naturales, Universidad De Buenos Aires, C1428EHA, Buenos Aires, 2 Consejo Nacional De Investigaciones Científicas Y Técnicas (CONICET), 3 Museo Argentino De Ciencias Naturales ‘Bernardino Rivadavia’, 4 Instituto Nacional De Investigación Y Desarrollo Pesquero, PO Box 175, 7600 Mar Del Plata and 5 Instituto Antártico Argentino, Cerrito 1248, 1010 Buenos Aires, Argentina

* Corresponding Author: demetrio{at}bg.fcen.uba.ar

Vertically stratified bottle plankton samples collected in the Río de La Plata estuary (Atlantic coast of South America at ~35°S) and in coastal waters off Mar del Plata (~38°S) in December 1999 and November 2001 yielded up to 394 live cells l-1 of a single new nassellarian species: Lophophaena rioplatensis n. sp. (family Plagoniidae). In estuarine waters, the species was recorded at salinities as low as 15.4 p.s.u.; densities in excess of 100 cells l-1 were found at salinities ranging from 16.9 p.s.u. These extremely high concentrations (the highest ever reported in the literature), as well as the fact that >90% of the individuals recorded contain cytoplasm, indicate that these are self-sustaining populations which thrive in the estuary (and in nearshore coastal waters), probably due to plentiful dissolved silica and an abundant food supply. Lophophaena rioplatensis is the first polycystine brackish-water species described. This finding shows that radiolarian fossils are not unequivocally associated with open-ocean conditions, but may also be useful indicators of coastal and brackish estuarine paleoenvironments.


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