>Can anyone suggest any papers that examine the stable isotopes of carbon
>in dissolved inorganic carbon in river or stream waters?   I am
>particularly interested in instances where very low d13C values may have
>been observed.
>Melissa Lafrenière

Dear Melissa (and any others that might be interested),

Here are some references that you might find useful:

E.A. Atekwana and R.V. Krishnamurthy (1998) Seasonal variations of
dissolved inorganic carbon and d13C of surface waters: application of a
modified gas evolution technique.  J. Hydrology, 205: 265-278

F. Pawellek and J. Veizer (1994) Carbon cycle in the upper Danube and its
tributaries: d13C(DIC) constraints.  Israel J. Earth Sci., 43: 187-194

B. Spiro and A. Pentecost (1991) One day in the life of a stream - a
diurnal inorganic carbon mass balance for a travertine-depositing stream
(Waterfall Beck, Yorkshire).  Geomicrobiology J., 9: 1-11

C. Yang, K. Telmer and J. Veizer (1996) Chemical dynamics of the "St.
Lawrence" riverine system: dD H2O, d18O H2O, d13C DIC, d34S sulfate, and
dissolved 87Sr/86Sr.  Geochim. Cosmochim. Acta, 60: 851-866

Cheers,
Simon

*****
Simon R. Poulson
Dept. of Geological Sciences MS-172
University of Nevada-Reno
Reno, NV 89557-0138
USA
Phone: (775) 784-1104
Fax: (775) 784-1833
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*****