Plankton 13C: 12C ratio changes with latitude: differences between northern and southern oceans

Latitudinal trends in plankton 13 C: 12 C significantly differ between northern and southern oceans. The results corroborate previous that (1) a strict temperature-plankton 13 C: 12 C relationship common to all oceans does not exist, and (2) geographic differences in plankton biosynthesis or metabolism are important in causing latitudinal variations in plankton carbon isotope abundance.