Moss stable isotopes (carbon-13, oxygen-18) and testate amoebae reflect environmental inputs and microclimate along a latitudinal gradient on the Antarctic Peninsula.

Isotopic composition of contemporary source water The isotopic composition of AP precipitation, including all 57 rain and snow samples, was well explained by a highly significant local meteoric water line (LMWL; δ 2 H as a function of δ 18 O) with a gradient of 7.3, below that of the global meteoric water line (GMWL; δ 2 H = 8δ 18 O + 10) across the measured range of δ 18 O values (−2 to −16 ‰; Fig. 3 ).

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