INVESTIGADORES
GOMEZ Nora
artículos
Título:
Epiphytic algae on Scirpus californicus (Mey) Sójak in the Río de la Plata (Argentina):. structure and architecture
Autor/es:
GOMEZ, N.; LICURSI, M.; HUALDE, P. R.
Revista:
ARCHIV FUR HYDROBIOLOGIE
Editorial:
E. Schweizerbart' sche Verlagsbuchhandlung
Referencias:
Lugar: Alemania; Año: 2003 vol. Sup1 p. 231 - 247
ISSN:
0003-9136
Resumen:
Abstract: The objective of this study is to
determine which are the characteristic algal communities
coating the stems of Scirpus
californicus (MEY) STEUD in the Río de la Plata. Taxonomic composition,
disposition of the algae in the
biofilm, spatial pattems of abundance and species diversity and lifeform
strategies were analysed. Samples of
periphyton were taken in winter and spring 1999 and
summer and autumn 2000, at five
sampling sites. Physical-chemical characteristics were measured
in summer and autumn 2000. Ten stems
of the bulrush were cut randomly and the bottom 15 cm kept
and put into a flask with distilled
water. The biofilm was removed by brushing, integrating the
material collected in each sampling
site. The algae that comprised the biofilm analysed showed a
simple architecture consisting of a
layer dominated mainly by biraphid diatoms, with planktonic
diatoms and/or filamentous
chlorophytes entrapped in the surface film. The matrix analysed in this
study corresponds to early stages of
succession characterized by R-selected taxa, considered to be
pioneer species and good colonizers
in a disturbed system. During spring, winter and autumn, diatoms
were dominant, but with different
species compositions, while in summer green algae were abundant.
The epiphyton of the bulrushes
studied was characterized by a low proportion of epiphytic specimens
sensu strictu (adnate, stalked and
erect forms) exhibiting a high proportion of immigrants from the
benthos
and plankton.