To calculate the contribution beavers make to the methane budget in streams, submerged carboys of collected gases were taken at ten sites on four streams in the Matamek River watershed, Quebec, Canada. The ten sites were a mixture of pools in large and small streams, beaver ponds, and riffles. Gases collected underwater were sampled via an air sampling tube which reached into the middle of the collection container. Gas was collected weekly from May through October 1984 and analyzed for methane concentration. Winter methane evasion rates were estimated using the first and last measurements during the ice-free period of sampling.
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