Seasonal variation in concentrations of carbohydrates and lipids in two epiphytic lichens with contrasting, snow-depth related distribution on subarctic birch trees
| العنوان: | Seasonal variation in concentrations of carbohydrates and lipids in two epiphytic lichens with contrasting, snow-depth related distribution on subarctic birch trees |
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| المؤلفون: | Bengt Carlsson, Mats Sonesson, Bjartmar Sveinbjörnsson, Åsa Grimberg |
| المصدر: | The Bryologist. 114:443-452 |
| بيانات النشر: | American Bryological and Lichenological Society, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Parmelia, biology, Ecology, Plant Science, Seasonality, biology.organism_classification, Snow, medicine.disease, Subarctic climate, Thallus, Abundance (ecology), Botany, medicine, Epiphyte, Lichen, Ecology, Evolution, Behavior and Systematics |
| الوصف: | The lichens Parmelia olivacea and Parmeliopsis ambigua are common epiphytes in subarctic forests in Europe. They differ in abundance and vertical distribution particularly on birch trees, and these differences relate to the level and duration of the winter snow cover. Parmeliopsis ambigua is covered much of the cold season on the lower trunk whereas P. olivacea occurs well above the snow surface. Periods over 6 months under snow have no apparent effect on P. ambigua thalli while much shorter snow cover has been demonstrated to kill P. olivacea. It was hypothesized that the contrasting distributions are due to differences in growth rates and in size and quality of non-structural carbon stores in their tissues affecting their endurance to extended periods of dark respiration. To test these hypotheses, growth measurements were performed on both species and their thalli were sampled for chemical analyses. The results show that the mean annual margin extension growth of P. olivacea thalli was signific... |
| تدمد: | 1938-4378 0007-2745 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::30acd298777a8008b0839ca3bbb096d2Test https://doi.org/10.1639/0007-2745-114.3.443Test |
| رقم الانضمام: | edsair.doi...........30acd298777a8008b0839ca3bbb096d2 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19384378 00072745 |
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