Abstract
Photosynthetic characteristics of an alpine and a subalpine population of Nephroma arcticum, assumed to represent different ecotypes, were measured to investigate possible adaptations to their respective environments. The light compensation levels in the alpine population were consistently higher than those in the subalpine ones, and the chlorophyll contents of the former were, on average, about half those of the latter, reflecting the differences in light regimes between sites. In both populations, altitude accounted for a significant part of the variation in photosynthesis at suboptimal thallus water contents assumed to correspond to levels resulting from normal in-situ hydration (...)
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