Abstract
Fine particulate organic carbon (FPOC) output was sampled from three fens in the Sagehen Creek basin in the Sierra Nevada mountains to establish any seasonal or daily trends in output. Stream invertebrates were sampled to determine if they were more abundant below fen outlets to Sagehen Creek. We found the fens released large quantities of FPOC annually (5 to 20 g m-2 yf-') with the greatest concentrations from all fens combined occurring in summer (2 mg 11). Large fluctuations in output occurred in summer; lowest concentrations were in afternoon coincident with high stream temperature and low discharge. Filter feeding blackflies in Sagehen Creek were significantly more abundant below fen outlets than above, but other benthic macroinvertebrates showed no response.
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