“…Low CO2 cultures were thosc with 2000 to 4000 pM DIC concentrations. Sources for culture stud~es include: Degens et al (1968a) (excluding air-grown S. costatum), Estep et al (1978), Wong & Sackett (1978), Johnston & Raven (1992, Hinga et al (1994) (excluding experimental run 12), Thompson 8 Calvert (1994), and Laws et a1 (1995). Sources for field studies include: Degens et al (1968b), Deuser (1970), Gearing et al (1984, Hedges et al (1988), Duggins et al (1989), Goering et al (1990), Fischer (1991), Fry & Wainright (1991), Voss (1991), Fogel et al (1992, Ostrom (1992), Nakatsuka et al (1992), Rau et al (1992), Francois et al (1993), Simenstad et al (1993) for Arctic 6I3C-DIC measurements, J.…”