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Hydration traits in cephalolichen members of the epiphytic old forest genus Lobaria (s. lat.)

Published online by Cambridge University Press:  19 September 2017

Sara LONGINOTTI ,
Knut Asbjørn SOLHAUG  and
Yngvar GAUSLAA
Sara LONGINOTTI
Affiliation:
Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway.
Knut Asbjørn SOLHAUG
Affiliation:
Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway.
Yngvar GAUSLAA*
Affiliation:
Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway.
*
Email: yngvar.gauslaa@nmbu.no
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Abstract

This study aims to quantify the size-dependency of important hydration traits in Lobaria amplissima, L. pulmonaria and L. virens sampled in sympatric populations on deciduous tree trunks in southern Norway, and to discuss possible implications of species-specific traits for the ecological niches of these old forest cephalolichens. Traits measured were thallus size (area and mass), specific thallus mass (STM), internal (WHCinternal) and external water-holding capacity (WHCexternal), and water content (WC) after shaking and after blotting. Lobaria amplissima had the highest WHCinternal, 2·6 times higher than L. pulmonaria with the lowest WHCinternal. WHCinternal, driven by STM, strongly depended on size. WHCexternal was 28% (L. virens) to 47% (L. pulmonaria) of the WHCinternal. Unlike WHCinternal, WHCexternal did not depend on thallus area, meaning that WHCexternal is proportionally higher for smaller compared with larger thalli. The most widespread species, L. pulmonaria, benefits from a flexible hydration strategy due to low STM, facilitating the use of more diverse water sources than the other two species that depend more on rain, particularly L. amplissima with the highest STM and thus relatively high WHCinternal. For L. virens, a combination of less specialized hydration traits and a low tolerance to higher light intensity probably jeopardizes its survival outside rainforest habitats.

Keywords

Lobaria amplissimaLobaria pulmonariaLobaria virensspecific thallus masswater-holding capacitywater storage
Type
Articles
Information
The Lichenologist , Volume 49 , Issue 5 , September 2017 , pp. 493 - 506
Copyright
© British Lichen Society, 2017 

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