CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Phytoplankton of the Paraguay and Bermejo rivers
Autor/es:
ZALOCAR DE DOMITROVIC YOLANDA; DEVERCELLI, MELINA; FORASTIER MARINA E.
Revista:
FUNDAMENTAL AND APPLIED LIMNOLOGY
Editorial:
E SCHWEIZERBARTSCHE VERLAGS
Referencias:
Lugar: Stuttgart; Año: 2014 vol. 65 p. 67 - 80
ISSN:
1863-9135
Resumen:
This article deals with the phytoplankton of the Paraguay and Bermejo rivers, with emphasison the spatial and temporal patterns of its composition, density, biomass, diversity and communitysize structure. The phytoplankton of the Paraguay River is characterized by the dominance of smallChlorophyceae and Cryptophyceae, with a gradual increase in Bacillariophyceae towards its confl uencewith the Paraná River. In the northern stretch, where the Pantanal drains, Bacillariophyceae exceptionallyshare the dominance with Chlorophyceae and Euglenophyceae. Small Chlorophyceae prevail intransparent waters, whereas Aulacoseira (A. granulata and A. herzogii) predominates throughout themain channel, in relation with a higher turbulence and lower water transparency. Density, biomass,diversity and species richness present an inverse relationship with the hydrometric level. Such variablesare positively correlated with water temperature, and present a decrease from north to south in relationto increased suspended solids and conductivity and decreased water transparency. The Bermejo River,which is a main tributary of the Paraguay River in its lower section, is the main determinant of the sharpdecrease in the main variables of the phytoplankton in the low Paraguay.