Function and structure of river sediment biofilms and their role in dissolved organic matter utilization
The objective of this thesis was to study how sediment microbial communities in Mediterranean rivers used dissolved organic matter at different spatial and temporal scales. Results from the two field studies, showed that the quality and origin of the dissolved organic matter (allochthonous versus au...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | CBUC, CESCA |
| Repositorio: | TDR. Tesis Doctorales en Red |
| OAI Identifier: | oai:www.tdx.cat:10803/363921 |
| Acceso en línea: | http://hdl.handle.net/10803/363921 |
| Access Level: | acceso abierto |
| Palabra clave: | Biofilms Rius Rivers Ríos Mediterranean Region Regió mediterrànea Región mediterránea River sediments Sediments fluvials Sedimientos fluviales Canvis climàtics Climatic changes Cambios climáticos Microorganisms Microorganismes 55 574 577 |
| Sumario: | The objective of this thesis was to study how sediment microbial communities in Mediterranean rivers used dissolved organic matter at different spatial and temporal scales. Results from the two field studies, showed that the quality and origin of the dissolved organic matter (allochthonous versus autochthonous) and the different hydrological periods (drought versus base flow) highly modified the biofilm functioning and composition. On the other hand, the two laboratory experiments showed that first, the decrease in dissolved oxygen in sediment depth determined the microbial organic matter degradation. And second, results also showed that warming river water increased the heterotrophy of the microbial communities and clearly modified the food web structure. In conclusion this thesis demonstrates that the structure and functioning of sediment biofilms change at different spatial and temporal scales and they are sensitive to the increase in water pollution and the effects of global climate change. |
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