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3D modelling of thallus topography of Lobaria pulmonaria facilitates understanding of water storage pools

Published online by Cambridge University Press:  20 February 2019

Nathan H. PHINNEY Open the ORCID record for Nathan H. PHINNEY [Opens in a new window]
Nathan H. PHINNEY*
Affiliation:
Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Norway. Email: naph@nmbu.no
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Abstract

Lobaria pulmonaria is a widespread epiphytic foliose lichen that exhibits a prominent reticulum, a structure that has a presumed role in mechanical support and water capture. Using photogrammetry, thallus topography was digitally modelled in three dimensions to calculate 3D surface area (A3D), which was consistently greater than areas extracted from projected images (A2D). The A3D:A2D ratio, a proxy for topographic three-dimensionality, was strongly correlated with both specific thallus mass (STM) and external water-holding capacity (WHCexternal), suggesting that the reticulum in L. pulmonaria extends hydration, photosynthetic activity and growth, following rainfall. Three-dimensionality was more pronounced in larger thalli, which is likely beneficial to liquid water-dependent internal cephalodia that occur more in older thalli and most often within the fovea.

Keywords

ecohydrologyfunctional traitshydrationmacrolichen morphologyphotogrammetrypoikilohydry

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Type
Articles
Information
The Lichenologist , Volume 51 , Issue 1 , January 2019 , pp. 89 - 95
Copyright
© British Lichen Society, 2019 

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