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Abstract
The contributions of Hubert Ziegler to our understanding of physiological plant ecology through natural abundance studies of the stable isotopes of carbon, hydrogen and nitrogen are reviewed. These have served to expand our knowledge of plant distributions and physiological functions, especially the processes linking pathways of photosynthetic carbon metabolism and transpiration. They have also served to indicate food chain relationships and organism to organism interactions. His leadership has placed stable isotope techniques firmly on centre-stage, as indicators and integrators of plant biospheric processes in the environmental context.