Considerações limnológicas sobre um lago da planície de inundação amazônica (lago Catalão – Estado do Amazonas, Brasil)
| Autor: | Sérgio Melo, Fabiane Ferreira de Almeida |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category Floodplain Flood myth Ecology Amazonian fungi food and beverages Seasonality medicine.disease General Biochemistry Genetics and Molecular Biology parasitic diseases medicine Environmental science Photic zone Spatial variability General Agricultural and Biological Sciences Diel vertical migration geographic locations Limnetic zone |
| Zdroj: | Acta Scientiarum. Biological Sciences. 31 |
| ISSN: | 1807-863X 1679-9283 |
| DOI: | 10.4025/actascibiolsci.v31i4.4641 |
| Popis: | The temporal and spatial variation of some limnological variables in the limnetic zone of an Amazonian floodplain lake, Catalao Lake, was studied. The following parameters were measured weekly during the dry period of 2006 and the flood period of 2007: water temperature, euphotic zone, mixing zone, electrical conductivity, dissolved oxygen, water transparency and total phosphorus and nitrogen. Simple regressions were carried out to test the hypothesis of environmental homogeneity as a function of flooding. Also, diel temperature, dissolved oxygen and electric conductivity profiles were studied during the dry period and in the flood period. The results show the importance of the flood pulse in the variation of the physical and chemical variables in the lake. The PCA indicated that, during the dry period, the physical and chemical variables had a stronger spatial pattern of distribution, while during the flood period, the pattern was temporal. The regressions indicated the homogeneity of the environment as a function of flooding. The results of the diel cycles seem to indicate that Catalao lake has a polimictic and oligomictic behavior during the dry and flood periods, respectively |
| Databáze: | OpenAIRE |
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