| Autor: |
CASTRO, A. L. C., ESCHRIQUE, S. A, SILVEIRA, P. C. A., AZEVEDO, J. W. J., FERREIRA, H. R. S., SOARES, L. S., MONTELES, J. S., ARAÚJO, M. C., NUNES, J. L, SILVA, M. H. L. |
| Předmět: |
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| Zdroj: |
Applied Ecology & Environmental Research; 2018, Vol. 16 Issue 4, p4829-4847, 19p |
| Abstrakt: |
The dynamics of the physical and chemical factors that regulate oceanographic processes on the continental shelf off the state of Maranhão (northeastern Brazil) was evaluated using a transect along São Marcos Bay (01°41'S-02°28'S and 43°47'W-44°13'W) in January, March, May, July and September 2014, with a total of seven sampling stations. Water samples were collected from the surface using a Van Dorn water sampler. The following hydrochemical variables were analyzed: water transparency (m), temperature (°C), salinity, conductivity (mS cm-1), total dissolved solids (TDS, g L-1), pH, dissolved oxygen (mg L-1), turbidity (NTU), total suspended solids (TSS) and dissolved nutrients (phosphate, nitrite and silicate). The relationship between these variables and seasonality in the region [rainy season (January to June) and dry season (July to December)] were also evaluated. For data with normality and equal variances, a one-way analysis of variance (ANOVA) was used for the spatial and temporal comparisons of the physicochemical variables. Results showed that the spatial and temporal variability of the physicochemical variables analyzed in this study is associated with local dynamics governed by river discharge, tidal movements, currents and meteorological events. The fluvial transport from the rivers of the state of Maranhão and other freshwater sources in the Amazon region are apparently the major contributors responsible for the maintenance of nutrient availability on the Maranhão continental shelf.The present paper aims to broaden the knowledge of the spatial and temporal variability in the physicochemical variables in continental shelves and adjacent waters the coast of Maranhão (North Brazil). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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