Equations of the tissue isotopic enrichments
by time, the half-life turnover values ([T.
15]N isotopic enrichment
and first-order reaction rates.
Calibration curves for isotopic enrichment
were constructed by plotting the [MPE.
We use the isotopic enrichment
of PON as a proxy for phytoplankton (using appropriate scaling functions) because our data set for [[N.
in the alewife shadows that of planktonic copepods, which in turn is temporally linked to that of A.
of water in the "woody" tissues of plants: implications for plant water source, water uptake, and other studies which use the stable isotopic composition of cellulose.
Physiological ecologists can greatly contribute to progress in isotopic ecology by providing a quantitative description of the fates of amino acids in different tissues, by "calibrating" the isotopic enrichment
of different tissues during starvation, and by providing the mechanisms that give rise to this enrichment (see Millward 1979, 1989).