Summary
The response of net photosynthesis and dark respiration in eight species of Umbilicariaceae (lichenes) to temperature (-5, 0, 5, 10, 15, 20, 25, 30°C) and irradiance (55, 110, 220, 400, 620 μmol photons m-2 s-1 PAR) was studied. The samples were collected in montane and alpine localities of the Spanish Sistema Central. The species differed widely in their net photosynthetic rates. The optimal temperature for net photosynthesis in alpine species was significantly lower than in montane species. Montane species were more photophytic than alpine ones. Water saturation and water loss rate were dependent on morphology and particularly anatomy of the thallus. The physiological and structural data are useful in the interpretation of the ecology and altitudinal distribution of the Umbilicariaceae. No adaptation could be linked to particularities of the mediterranean climate.
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Sancho, L.G., Kappen, L. Photosynthesis and water relations and the role of anatomy in Umbilicariaceae (lichenes) from Central Spain. Oecologia 81, 473–480 (1989). https://doi.org/10.1007/BF00378954
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DOI: https://doi.org/10.1007/BF00378954