| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000408911 |
| ISSN: | 0001-3765 |
| Authors: | Brandao, Luciana P.M1 Brighenti, Ludmila S2 Staehr, Peter A1 Barbosa, Francisco, A.R2 Bezerra-Neto, Jose F2 |
| Institutions: | 1Aarhus University, Department of Bioscience, Roskilde. Dinamarca 2Universidade Federal de Minas Gerais, Instituto de Ciencias Biologicas, Belo Horizonte, Minas Gerais. Brasil |
| Year: | 2017 |
| Season: | May |
| Volumen: | 89 |
| Pages: | 469-489 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | We studied the effects of particulate and dissolved optically active components on the attenuation of photosynthetic active radiation (PAR) in a tropical lake. The temporal and spatial distribution of tripton, Chl- a and a CDOM (440) and their relative contribution to the diffuse PAR attenuation coefficient ( Kd ) was investigated at 21 sites (dry and wet seasons and two intermediate periods) and at monthly interval at 1 pelagic site. Higher values of Kd were observed during the mixing period, characterized by a higher concentration of tripton and Chl- a compared to the stratified rainy season. In the spatial sampling PAR attenuation was dominated by tripton absorption/scattering (average relative contribution of 79%), followed by Chl- a (average 11.6%). In the monthly sampling tripton and Chl- a accounted for most of the Kd with relative contributions of 47.8% and 35.6%, respectively. Multiple linear regression analysis showed that Chl- a and tripton in combination explained 97% of the monthly variation in Kd (p<0.001), but Chl- a had more influence (higher regression coefficient). Thus, although most of light attenuation was due to tripton, seasonal variations in phytoplankton abundance were responsible for most of the temporal fluctuations in Kd |
| Disciplines: | Biología, Geociencias |
| Keyword: | Biología celular, Fisiología vegetal, Hidrología, Clorofila a, Coeficiente de atenuación, Atenuación de la luz, Tripton |
| Keyword: | Biology, Earth sciences, Cell biology, Plant physiology, Hydrology, Chlorophyll a, Attenuation coefficient, Light attenuation, Tripton |
| Full text: | Texto completo (Ver PDF) |
