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Net Photosynthesis and Respiration of Cladonia ecmocyna (Ach.) Nyl. from the Rocky Mountains and Comparison with Three Eastern Alpine Lichens

William G. Eickmeier and Michael S. Adams
The American Midland Naturalist
Vol. 89, No. 1 (Jan., 1973), pp. 58-69
DOI: 10.2307/2424135
Stable URL: http://www.jstor.org/stable/2424135
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Net Photosynthesis and Respiration of Cladonia ecmocyna (Ach.) Nyl. from the Rocky Mountains and Comparison with Three Eastern Alpine Lichens
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Abstract

The dependence of net photosynthesis and dark respiration on irradiance, thallus temperature and hydration was examined in a western United States, subalpine population of Cladonia ecmocyna from near Loveland Pass, Colorado. Comparisons were made with eastern United States alpine populations of Cetraria nivalis, C. islandica, and Cladonia rangiferina from Mt. Washington, New Hampshire. Cladonia ecmocyna has: (1) lower optimum temperature for net photosynthesis, (2) greater efficiency of utilization of high irradiance levels and (3) maximum photosynthesis at 70% relative water content, compared to maximal rates at or near full hydration, for the eastern populations. These ecophysiological adaptations are related to environmental differences between eastern and western United States alpine and subalpine areas.

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