| Revista: | Atlantica (Rio Grande) |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000331622 |
| ISSN: | 0102-1656 |
| Autores: | Souza, Neusiane Chaves de1 Abreu, Paulo Cesar1 |
| Instituciones: | 1Universidade Federal do Rio Grande, Instituto de Oceanografia, Rio Grande, Rio Grande do Sul. Brasil |
| Año: | 2009 |
| Periodo: | Jul-Dic |
| Volumen: | 31 |
| Número: | 2 |
| Paginación: | 145-157 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | In this study we aimed to determine which factors control the abundance of free (FB) and attached bacteria (AB) in nine lakes at the Campus Carreiros of the Federal University of Rio Grande – FURG. Dissolved oxygen, seston weight, dissolved inorganic nutrients (ammonia, nitrite, nitrate and phosphate), chlorophyll a and the abundance of bacteria, flagellates and ciliates were investigated in a sample carried out in all lakes on September 10th 2007. There was no direct relationship between chlorophyll a and bacterial abundance, indicating that the main dissolved organic carbon source for bacteria comes from the decomposition of macrophytes and plants present in the lakes, or in their surroundings. However, it was observed a negative relationship between AB and oxygen, and a direct correlation between this kind of bacteria and seston loads. Similarly, there was a direct relationship between AB and flagellates and ciliates, suggesting a possible “Top-Down” control of attached bacteria in the lakes. On the other hand, FB were positively related to the phosphate concentration, indicating a possible “Bottom-Up” control |
| Resumen en portugués | In this study we aimed to determine which factors control the abundance of free (FB) and attached bacteria (AB) in nine lakes at the Campus Carreiros of the Federal University of Rio Grande – FURG. Dissolved oxygen, seston weight, dissolved inorganic nutrients (ammonia, nitrite, nitrate and phosphate), chlorophyll a and the abundance of bacteria, flagellates and ciliates were investigated in a sample carried out in all lakes on September 10th 2007. There was no direct relationship between chlorophyll a and bacterial abundance, indicating that the main dissolved organic carbon source for bacteria comes from the decomposition of macrophytes and plants present in the lakes, or in their surroundings. However, it was observed a negative relationship between AB and oxygen, and a direct correlation between this kind of bacteria and seston loads. Similarly, there was a direct relationship between AB and flagellates and ciliates, suggesting a possible “Top-Down” control of attached bacteria in the lakes. On the other hand, FB were positively related to the phosphate concentration, indicating a possible “Bottom-Up” control |
| Disciplinas: | Biología |
| Palabras clave: | Biología acuática, Bacterioplancton, Composición de la comunidad, Abundancia, Lagos someros, Parámetros ambientales |
| Keyword: | Biology, Aquatic biology, Bacterioplankton, Community composition, Abundance, Shallow lakes, Environmental parameters |
| Texto completo: | Texto completo (Ver HTML) |
