Nuevos registros de diatomeas típicas de sedimento en el plancton de la costa del Mar Argentino

FERRARIO, M.E.; ALMANDOZ, G.; GARIBOTTI, I.A.; LICEA, S.

BOLETíN DE LA SOCIEDAD ARGENTINA DE BOTáNICA

Sociedad Argentina de Botanica

Lugar: Buenos Aires, Argentina; Año: 2003 vol. 38 p. 123 - 129

0373-580X

New records of diatoms typical of sediment in plankton of the Argentine Sea coast. In this work the results derived from a more extensive analysis about the diatom flora of coastal sites located in Bahía Anegada, Pehuen-có, Claromecó, and Monte Hermoso (province of Buenos Aires, Argentina) are presented. The genus Eunotogramma Weisse is recorded for the first time in the country and the species Delphineis minutissima (Hustedt) Simonsen and Nitzschia hummii Hustedt are recorded for the first time in the Atlantic coast of the Southern Hemisphere. The former species has been reported only occasionally in the world and the latter one has only been mentioned in its original description. Moreover, the ultrastructure of N. hummii and D. minutissima which have not been analyzed with electron microscopy up to now, are described. Although they are characteristic of sediments, the analyzed taxa were found in planktonic samples. In Bahia Anegada, this probably results from the removal of material from the sea bottom, maybe due to high wind stress and high water discharges of surrounding rivers in the bay, which affect this area during some periods of the year.