Periphytic algae of two bioforms of macrophytes in a subtropical shallow lake of Argentina

VALLEJOS, S.V.; ZALOCAR DE DOMITROVIC, Y.; MARTÍNEZ M.S.

IHERINGIA. SERIE BOTANICA

FUNDACAO ZOOBOTANICA RIO GRANDE SUL

Lugar: Porto Alegre; Año: 2015 vol. 70 p. 129 - 142

0073-4705

The aim of this study was to analyze the structure and temporal variations of density and diversity of periphytic algae from Potamogeton illinoensis Morong (submerged and perennialmacrophyte) and Nymphoides indica (Linné) Kuntze (rooted floating leaves and seasonal growth). The study was conducted in a shallow lake in northeastern Argentina(27° 29´ S; 58°45´ W), between March 2007 and February 2010. Sixty-one taxa were exclusive to P. illinoensis, 12 were exclusive to N. indica, and 54 were common to both. The density, number of species and diversity were comparatively higher in P. illinoensis than in N. indica. Cyanobacteria (mainly Stigonema hormoides Bornet & Flahault) was dominant in P. illinoensis, whereas Chlorophyta (Oedogonium spp.) was dominant in N. indica. Potamogeton illinoensis developed a stable, mature epiphytic community over time. In N. indica the density and diversity of periphytic algae were related by the plant seasonality and water level fluctuations.