| Full text | |
| Author(s): |
Total Authors: 4
|
| Affiliation: | [1] Universidade Estadual Paulista. Departamento de Zoologia - Brasil
[2] Universidade Estadual Paulista. Departamento de Zoologia - Brasil
[3] Universidade Estadual Paulista. Departamento de Zoologia - Brasil
[4] Universidade Federal de São Carlos. Departamento de Hidrobiologia. Laboratório de Plâncton - Brasil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Biota Neotropica; v. 20, n. 4 2020-09-18. |
| Abstract | |
Abstract: We present here the first study that analyzed the composition and richness of rotifers of the entire La Plata River basin, the second largest in South America, based on simultaneous and standardized sampling. Fifteen large reservoirs and eight river stretches were selected in the upper, middle, and lower portions of the Paraná, Paraguay, and Uruguay Rivers, which are the major rivers of the La Plata basin. We took a total of 86 samples (open water habitats) in 2010. A mean of 27±11 species per sub-basin was found, with the highest richness in the Lower Paraná (41 species), followed by the Paranapanema (40 species) and Lower Uruguay (38 species). Low richness was observed in the Middle Uruguay and Middle Paraná. We found 106 species belonging to 21 families and two orders. The family with the highest number of species was Lecanidae (21), followed by Brachionidae (20), Trichocercidae (9), and Synchaetidae (8). The species with higher occurrences were Conochilus dossuarius, Kellicottia bostoniensis, Keratella americana, Keratella cochlearis and Hexarthra mira. New occurrences of rotifers were registered for Brazil (Colurella adriatica), São Paulo State (Enteroplea lacustris), and Argentina (Gastropus hyptopus, Harringia rousseleti and Lecane thienemanni). Spearman correlation between the number of species and physical and chemical variables demonstrated positive correlation with chlorophyll and temperature, and negative correlation with dissolved oxygen. We extend the distribution list for some native (Lecane ludwigii) and non-native species of rotifers (K. bostoniensis). We also list the monogonont rotifer species found at the sampling stations. (AU) | |
| FAPESP's process: | 09/00014-6 - Limnological studies of large reservoirs of the River de la Plata Basin (Brazil, Argentine, Paraguay and Uruguay): a spatial geographical approach and the influence of present and historical processes |
| Grantee: | Marcos Gomes Nogueira |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 08/02015-7 - Planktonic microcrustaceans (Cladocera and Copepoda) in reservoirs and lotic stretches of the La Plata Basin (Brazil, Argentine, Paraguay and Uruguay): taxonomy, geographical distribution and ecological attributes |
| Grantee: | Gilmar Perbiche Neves |
| Support Opportunities: | Scholarships in Brazil - Doctorate |