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Morphology drives water storage traits in the globally widespreadlichen genus Usnea
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
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2018 (English)In: Fungal ecology, ISSN 1754-5048, E-ISSN 1878-0083, Vol. 35, p. 51-61Article in journal (Refereed) Published
Abstract [en]

Links between lichen morphology, internal/external water storage and distribution patterns are poorly known. We compared mass- (WC, % H2O) and area-based (WHC, mg H2O cm−2) hydration traits in seven pendent or shrubby Usnea species from oceanic to continental climates. All species held more external than internal water. Internal WHC and WC increased with specific thallus mass (STM, mg cm−2), while external WC decreased. Shrubby species had higher STM and total WHC than pendent ones. The continental Usnea hirta (shrubby) had the highest total and external storage; the suboceanic Usnea longissima (pendent) had the lowest internal storage. Morphology drives hydration traits and explains distributions of some Usnea species, but such traits did not distinguish oceanic from widespread species. Shrubby species maximize water storage and thus prolong hydration after rainfall events and/or hydration by dew. The low internal WHC in pendent species is likely an adaptation to frequent hydration in humid air.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 35, p. 51-61
Keywords [en]
Epiphytic lichens, Functional traits, Specific thallus mass, Water-holding capacity, Water content
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-151932DOI: 10.1016/j.funeco.2018.06.007ISI: 000444930900006Scopus ID: 2-s2.0-85050654829OAI: oai:DiVA.org:umu-151932DiVA, id: diva2:1249252
Funder
Swedish Research Council Formas, 2016-00553Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2018-10-05Bibliographically approved

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Palmqvist, KristinEkström, MagnusEsseen, Per-Anders

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