Abstract:
:The survival potential of lichens in a given habitat is determined by the response of CO2 exchange to photosynthetically active radiation (PhAR), thallus temperature, and thallus relative water content (RWC). Therefore morphologically similar lichens from contrasting climatic environments 1) should differ in their CO2 exchange responses, and 2) these differences should reflect adaptations to their climatic regimes. The CO2 exchange responses of a subarctic (55°N, 67°W) Cladina stellaris (Opiz) Brodo population and a temperate (29°N, 82°W) Cladina evansii (Abb.) Hale and W. Culb, population were used to test these two related hypotheses.Infrared gas analysis with lichens collected in September-October 1975 established that the two populations differed in their responses to incident PhAR, thallus temperature, and thallus RWC. Net photosynthesis in C. stellaris had an optimum at a lower temperature and a greater relative photosynthetic capacity at low temperatures than did C. evansii. Cladina evansii maintained net photosynthesis above 35°C thallus temperature; C. stellaris did not. In both species the optimum temperature for net photosynthesis increased with increasing irradiance. The C. stellaris light saturation point was consistently lower than that of C. evansii. Both species had maximal rates of net photosynthesis at 70-80% relative water content. In C. evansii the CO2 exchange rates, expressed as percentages of the maximum rate, declined more rapidly under suboptimal conditions. The absolute CO2 exchange rates of C. evansii were greater than those of C. stellaris. At 20°C and 90-95% RWC, resaturation respiration occurred in both species and continued until 6-7 h after wetting.Contrasts in the temporal patterns of thallus condition at each collection site suggest that not all differences in the two response surfaces reflect climatic adaptation. The two populations appear well adapted to incident PhAR and thallus temperature regimes but the 70-80% RWC optimum for net photosynthesis common to both species is puzzling since their water regimes differ markedly. The overall adaptedness of the CO2 exchange responses in the two species cannot be judged without a comprehensive quantitative analysis of carbon balance under differing climatic regimes.
journal_name
Oecologiajournal_title
Oecologiaauthors
Lechowicz MJdoi
10.1007/BF00366074subject
Has Abstractpub_date
1978-01-01 00:00:00pages
225-237issue
2eissn
0029-8549issn
1432-1939pii
10.1007/BF00366074journal_volume
32pub_type
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