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Type: Journal article
Title: Differences in the utilization of water vapour and free water in two co-occurring foliose lichens from semi-arid southern Australia
Author: de Vries, M.
Watling, J.
Citation: Austral Ecology, 2008; 33(8):975-985
Publisher: Blackwell Science Asia
Issue Date: 2008
ISSN: 1442-9985
Statement of
Melita C. de Vries and Jennifer R. Watling
Abstract: Hydration and dehydration kinetics were investigated in two xerophytic lichens with contrasting thallus morphologies, Chondropsis semiviridis (F.Muell. ex Nyl.) Nyl. and Xanthoparmelia convoluta (Krempehl.) Hale. Pulse-modulated chlorophyll fluorescence was used to measure photosynthetic activity in thalli hydrated with either liquid water or water vapour in the laboratory and in the field. Water content (WC) and photosynthetic activity of thalli in both species increased rapidly on contact with liquid water. When exposed to water vapour, C. semiviridis hydrated more rapidly and achieved higher WC than X. convoluta. Both lichens achieved maximum Fv/Fm at low WC, regardless of hydration source. Rates of water loss were slower, and Fv/Fm remained high for longer, in X. convoluta than in C. semiviridis. Light saturated electron transport rates of both lichens were low compared with a homoiohydric plant from the same environment. Our results suggest that X. convoluta, which has a more complex morphology, retains water and remains photosynthetically active for significantly longer periods than C. semiviridis, providing X. convoluta with a potential advantage in the semi-arid environment in which both species are found.
Keywords: chlorophyll fluorescence; desiccation; hydration; lichen; photosynthesis
Description: © 2008 Ecological Society of Australia
RMID: 0020083322
DOI: 10.1111/j.1442-9993.2008.01868.x
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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