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Lobaria amplissima thalli with external cephalodia need more rain than thalli without

Published online by Cambridge University Press:  17 June 2019

Yngvar GAUSLAA Open the ORCID record for Yngvar GAUSLAA [Opens in a new window] ,
Stina JOHLANDER  and
Björn NORDÉN
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: [email protected]
Stina JOHLANDER
Affiliation:
Klareborgsgatan 21b, SE 41467 Gothenburg, Sweden.
Björn NORDÉN
Affiliation:
The Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway.
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Abstract

Hydration traits determine much of a lichen’s distribution pattern along a climatic gradient but the mechanisms involved are still incompletely known. A higher abundance of large external cephalodia in wet oceanic than in drier climates has previously been reported in Lobaria amplissima. This study aims to quantify how much more rain L. amplissima thalli with external cephalodia would need to fill their internal water holding capacity (WHCinternal) than thalli without. The mean WHCinternal was 1·8 times higher in thalli with external cephalodia than in those without. The WHCinternal when converted to mm rain needed to saturate an average specimen was 1·37 mm (min–max: 0·55–3·8 mm) for a cephalodiate thallus, whereas an average thallus without external cephalodia needed just 0·76 mm (min–max: 0·36–1·3 mm). Known dewfall rates and rates of water uptake from humid air are far below what is needed to saturate even the cephalodiate thallus with the lowest WHCinternal, implying a stronger dependency on rain for thalli with external cephalodia. Thus, the observed trends in this study are consistent with earlier reports of decreasing frequency of external cephalodia from wet to drier climates.

Keywords

cephalolichenscyanobacteriahydration traitsspecific thallus masswater storage
Type
Articles
Information
The Lichenologist , Volume 51 , Issue 3 , May 2019 , pp. 281 - 286
Copyright
Copyright © British Lichen Society 2019 

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