Metabolism of Basque streams measured with incubation chambers
The metabolism (gross primary production, GPP; respiration, R; and net metabolism, NM) of epilithon was measured by incubating randomly selected cobbles in recirculatory chambers in 21 Basque streams running to the Atlantic coast. The studied streams spanned a broad range of environmental conditions...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:80254 |
| Acceso en línea: | https://ddd.uab.cat/record/80254 |
| Access Level: | acceso abierto |
| Palabra clave: | Stream Metabolism Epilithon Spain Río Metabolismo Epiliton España |
| Sumario: | The metabolism (gross primary production, GPP; respiration, R; and net metabolism, NM) of epilithon was measured by incubating randomly selected cobbles in recirculatory chambers in 21 Basque streams running to the Atlantic coast. The studied streams spanned a broad range of environmental conditions and ranged in ecological status from excellent to poor. The GPP ranged from negligible to 35 g 02m-2d-1 , and the R ranged from 1 to 17 g 02m-2d-1. The NM showed that the epilithon was autotrophic in 15 sites and heterotrophic in the rest. None of the measured environmenta1 variables was significant1y correlated with R. Stepwise analyses showed that both the GPP and the NM were related to the epilithic chlorophyll a and phosphate concentrations. The metabolism values obtained were lower than those previously published from open-channel method, the number of autotrophic sites higher, and the controlling environmenta1 variables different. The difference between open-channel and chamber methods was not related to the area covered with cobbles in the study sites. Although chamber measurements yield results in sites where open-channel methods do not work, they seem to overestimate the importance of autotrophy. |
|---|