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Potential impacts of UV exposure on lichen communities:a pilot study of Nothofagus dombeyi trunks in southernmost Chile

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Ecosystem Health and Sustainability 2015年第4期1卷 40-52页

作者： Marie T.Trest Susan Will-Wolf Rachel Keuler Nathaniel Shay Karen Hill alyssa studer Andy Muench Zachary Alexander Axel Adams Leah Dittberner Martin Feehan Hannah Lee Nicholas Galleguillos-Katz Joy B.Zedler Linda Graham Patricia Arancibia-Avila Department of Botany University of WisconsinMadisonWisconsin 53706 USA Department of Basic Sciences University of Bio-BioChillan 3800708 Chile

High-latitude terrestrial ecosystems face the triple threats of climate warming,increased exposure to UV arising from polar ozone depletion,and *** communities of southernmost Chile are recognized for their high diversity,which includes nitrogen-fixing *** lichens are common on forest trees,contribute nitrogen to forests,and are sensitive to exposure following deforestation(widespread in this region).In a pilot study of exposure effects on tree lichens,using nondestructive imaging methods,we compared lichen communities on trunks of isolated *** tree trunks of southern Chilean beech(Nothofagus dombeyi,Nothofagaceae).We chose trees of similar diameter and trunk lean angle in conserved forest and nearby logged meadow on Navarino Island,XII Region Magallanes and Chilean Antarctica,Chile,within the annual southern ozone ***-five percent of cyanolichen records,including Nephroma antarcticum,and 66%of records for other foliose lichens were from the forest,whereas pendulous usneoid lichens dominated *** bark at the meadow *** of cyanolichen growth on isolated trees could affect ecosystem function in this poorly studied *** factors contributing to strong community differences were increased light intensity,UV radiation,and wind stress,plus limited ability of lichens to colonize isolated trees in the logged *** radiation was likely an important stressor for some lichen species but not *** recommend more extensive monitoring to pinpoint causes of differing lichen communities,and we encourage better protection of bark-dwelling lichens in southern hemisphere regions facing multiple threats.

关键词： bark lichens Chile cyanolichens deforestation forest fragmentation lichen diversity Nothofagus dombeyi southern ozone hole UV radiation

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