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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2013
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32729375014 |
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Table of Contents:
- Spatial and Temporal Hydrochemical Variation of a Third Order River Network in a Quasi Pristine Coastal Watershed, at Southern Bahia, Brazil ELLY R.S. DE SOUZA FRANCISCO C.F. DE PAULA Multidisciplinaria (Ciencias Naturales y Exactas) wetlands Rivers ecology biological reserve dissolved nutrients Rio da Serra watershed presents well preserved fragments of rain forest at the headwaters and small farms at middle and final stretches. These features allowed the study of fluvial hydrochemistry, under quasi pristine conditions. Sampling stations were established in order to represent the basin, and visited during dry, intermediate and wet periods. Obtained results are: temperature (22.1 – 28.6 °C); electric conductivity (34 – 52 μS/cm); dissolved oxygen (35 – 110%); pH (3.8 – 7.7); total suspended solids (1.1 – 20 mg/L); chlorophyll (1.0 – 9.2 μg/L); total N (74 – 580 μmol/L); particulate N (60 – 550 μmol/L); N-NO 3 (0.1 – 9.3 μmol/L); dissolved organic N (4 -70 μmol/L); total phosphorous (5.3 – 47 μmol/L); particulate P (4.4 – 59 μmol/L); P-PO 4 (0.1 – 0.7 μmol/L); dissolved organic P (0.01 – 2.0 μmol/L); silicate (30 -90 μmol/L); fecal coliforms (80 – 700 CFU/100mL). In seasonal terms dissolved oxygen, electric conductivity, nitrate and silicate concentrations were higher during the dry, whereas TSS was higher during the wet period. Seasonal differences of dissolved oxygen, temperature, pH and nitrate were also detected near wetlands areas. Along the basin results showed a distinction between headwaters and other sections, revealing a control of fluvial hydrochemistry by the preserved area, mostly for the dissolved organic N and P species and phosphate. 2013 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32729375014 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.85