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DOI: 10.3852/07-198
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Mycologia, 100(5), 2008, pp. 691-700.
© 2008 by The Mycological Society of America

Frequency, abundance and distribution of zoosporic organisms from Las Cañas stream (Buenos Aires, Argentina)


Agostina V. Marano 1

     Instituto de Botánica Spegazzini, calle 53 N 477, La Plata, Buenos Aires, Argentina

Marcelo D. Barrera

     Laboratorio de Investigación en Sistemas Ecológicos y Ambientales, diagonal 113 N 469, La Plata, Buenos Aires, Argentina

Mónica M. Steciow

     Instituto de Botánica Spegazzini, calle 53 N 477, La Plata, Buenos Aires, Argentina

Jorge L. Donadelli

     Instituto de Limnología Dr R.A. Ringuelet, avenida. Calchaquí Km. 23.5, Florencio Varela, Buenos Aires, Argentina

Mario C.N. Saparrat

     Instituto de Fisiología Vegetal, diagonal 113 esq. 61, La Plata, Buenos Aires, Argentina, and Instituto de Botánica Spegazzini, calle 53 N 477, La Plata, Buenos Aires, Argentina

Zoosporic organisms are common inhabitants of aquatic environments; however there are few ecological studies made for Argentinean streams. In this contribution the taxonomic composition of zoosporic organisms from a stream and their abundance, frequency and diversity on cellulosic baits were analyzed. Samples of water and floating organic matter (vegetable debris) were taken at four dates and different environmental variables (temperature, dissolved oxygen and nutrient concentrations) were measured. Twenty-one taxa were recovered with the baiting technique. Physicochemical fluctuations affected the structure of the studied community; in spring the greatest species richness was related to high nutrient levels whereas in winter the greatest abundance and diversity was related to low water temperature, nutrient levels and well oxygenated conditions.

Key words: aquatic environment, cellulosic substrates, Chytridiomycota, Peronosporomycota

1 Corresponding author. E-mail: agosvm{at}hotmail.com






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Copyright © 2008 by The Mycological Society of America.