Multiple stressor effects on river biofilm communities: from community composition to ecosystem processes using experimental mesocosms
Human exploitation of river ecosystems, together with the increasing pressure that represents climate change, is posing rivers worldwide at risk. In rivers, microorganisms are ecologically very important. Most of these microorganisms are in close contact with river substratum, where they form a 2/1...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | CBUC, CESCA |
| Repositorio: | TDR. Tesis Doctorales en Red |
| OAI Identifier: | oai:www.tdx.cat:10803/668838 |
| Acceso en línea: | http://hdl.handle.net/10803/668838 |
| Access Level: | acceso abierto |
| Palabra clave: | River biofilm Biofilm fluvial Mesocosms Mesocosmos Ecotoxicology Ecotoxicologia Ecotoxicología Bacteria Bacteris Bacterias Multiple stressors Múltiples estressors Múltiples estresores Metabarcoding Metabarcodificació Metabarcodificación River ecosystems Ecosistemes fluvials Ecosistemas fluviales 502 504 |
| Sumario: | Human exploitation of river ecosystems, together with the increasing pressure that represents climate change, is posing rivers worldwide at risk. In rivers, microorganisms are ecologically very important. Most of these microorganisms are in close contact with river substratum, where they form a 2/1 jelly layer known as biofilm. There is an urgent need to evaluate the effects of these so-called “stressors” (that is, toxic chemicals, water warming, desiccation...) on river biofilms. This thesis used artificial streams to evaluate the individual and combined effects of multiple stressors on river biofilms. The results indicate that desiccation is the main stressor, and that river biofilm components (bacteria, algae) can adapt to combined stress conditions only partially, showing altered ecological functions such as oxygen production, and degradation of organic matter |
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