Biodiversity and biogeographical implications of silica-scaled chrysophytes (Chrysophyceae and Synurophyceae) of the northeast wetlands of Argentina
Vigna, María S. Siver
Archiv für Hydrobiologie Volume 158 Number 3 (2003), p. 359 - 372
published: Dec 5, 2003
ArtNo. ESP141015873005, Price: 29.00 €
Wetlands and water bodies in the Paraná Delta River and Iberá System of northeast Argentina were studied for scaled chrysophytes. The Delta region of the Paraná River is composed of a series of braided channels, streams and lagoons that extend over 17,500km2. Although the Delta is situated in the temperate zone, it experiences a more subtropical climate. The water ways of the Iberá System consist of interconnected ponds, lagoons, and creeks covering approximately 12,000 km2. Twenty sites were sampled and their physico-chemical data measured. Twenty-seven species belonging to the genera Spiniferomonas, Paraphysomonas, Chrysosphaerella, Chrysodidymus, Mallomonas and Synura were recorded and in all cases the geographical distribution of these taxa were significantly expanded. A new variety, Mallomonas pseudocratis var. deltaensis, is described. Lastly, the colorless flagellate Gyromitus disomatus was found to be abundant in sites from Iberá.