Morphology influences water storage in hair lichens from boreal forest canopies

Esseen, Per‐Anders; Olsson, Therese; Coxson, Darwyn S.; Gauslaa, Yngvar

doi:10.1016/j.funeco.2015.07.008

Cited by 44 publications

(33 citation statements)

References 42 publications

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“…Apart of colony size, a 3-D complexity of colony may affect the rate of desiccation as well. Typically, surface to volume ratio and morphological structures (Esseen et al 2015) may affect water holding capacity and the rate of desiccation.…”

Section: Discussionmentioning

confidence: 99%

Dehydration-induced responses of primary photosynthetic processes and spectral reflectance indices in Antarctic Nostoc commune

Barták¹,

Hazdrová²,

Skácelová³

et al. 2016

Czech Polar Rep.

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In this study, we investigated the relationship between relative water content (RWC) of N. commune colonies recorded during gradual dehydration and (i) normalized difference vegetation index (NDVI), (ii) photochemical reflectance index (PRI), and (iii) primary photochemical processes of photosynthesis, effective quantum yield of photosynthetic processes ( PSII ) in photosystem II particular. PRI increased from -0.05 to 0.02 with RWC decrease from 100% (full hydration) to 0% (dry state). NDVI showed somewhat curvilinear relationship with desiccation with minimum value of 0.25 found at 10% RWC. Negative effect of suprasaturation of N. commune colony with water on effective quantum yield ( PSII ) was found at RWC range 80-100%. At the RWC range,  PSII reached only 50 % of maximum found at RWC of 30%. In general, desiccation-response curve of showed polyphasic character with three main phases (phase I -constant  PSII values, phase II -an increase with desiccation at RWC 80-30%, and phase IIIsigmoidal decrease with desiccation at RWC 0-30%). Non-photochemical quenching (qN) of absorbed light energy showed triphasic dependence on RWC as well. qN showed constant values in the phase I, an increase (phase II), and constant values at severe dehydration (phase III).

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Section: Discussionmentioning

confidence: 99%

Dehydration-induced responses of primary photosynthetic processes and spectral reflectance indices in Antarctic Nostoc commune

Barták¹,

Hazdrová²,

Skácelová³

et al. 2016

Czech Polar Rep.

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“…Some lichens (e.g. those that are thin and pendulous) generally have a limited ability to retain water (Esseen et al, ), even though they quickly take up water from humid air. Meanwhile, some other lichens (typically thick or gel‐like foliose cyanobacterial lichens) have the ability to retain water for lengthy periods (Lange et al, ; Gauslaa & Solhaug, ; Lange, Belnap & Reichenberger, ; Lange, ).…”

Section: Characterizing the Diversity Of Lichen Growth Forms And Funcmentioning

confidence: 99%

“…Meanwhile, some other lichens (typically thick or gel‐like foliose cyanobacterial lichens) have the ability to retain water for lengthy periods (Lange et al, ; Gauslaa & Solhaug, ; Lange, Belnap & Reichenberger, ; Lange, ). The water‐holding capacity of lichens is strongly positively correlated with their STM both within and across species (Gauslaa & Coxson, ; Merinero, Hilmo & Gauslaa, ; Esseen et al, ). There appears to be a trade‐off between the flexible and rapid moisture‐uptake strategy characteristic of thin chlorolichens that utilize humid air every night, and the conservative water‐storage strategy of cyanolichens that limit their photosynthesis to rarer rainy periods (Gauslaa, Coxson & Solhaug, ).…”

Section: Characterizing the Diversity Of Lichen Growth Forms And Funcmentioning

confidence: 99%

How lichens impact on terrestrial community and ecosystem properties

2016

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Lichens occur in most terrestrial ecosystems; they are often present as minor contributors, but in some forests, drylands and tundras they can make up most of the ground layer biomass. As such, lichens dominate approximately 8% of the Earth's land surface. Despite their potential importance in driving ecosystem biogeochemistry, the influence of lichens on community processes and ecosystem functioning have attracted relatively little attention. Here, we review the role of lichens in terrestrial ecosystems and draw attention to the important, but often overlooked role of lichens as determinants of ecological processes. We start by assessing characteristics that vary among lichens and that may be important in determining their ecological role; these include their growth form, the types of photobionts that they contain, their key functional traits, their water-holding capacity, their colour, and the levels of secondary compounds in their thalli. We then assess how these differences among lichens influence their impacts on ecosystem and community processes. As such, we consider the consequences of these differences for determining the impacts of lichens on ecosystem nutrient inputs and fluxes, on the loss of mass and nutrients during lichen thallus decomposition, and on the role of lichenivorous invertebrates in moderating decomposition. We then consider how differences among lichens impact on their interactions with consumer organisms that utilize lichen thalli, and that range in size from microfauna (for which the primary role of lichens is habitat provision) to large mammals (for which lichens are primarily a food source). We then address how differences among lichens impact on plants, through for example increasing nutrient inputs and availability during primary succession, and serving as a filter for plant seedling establishment. Finally we identify areas in need of further work for better understanding the role of lichens in terrestrial ecosystems. These include understanding how the high intraspecific trait variation that characterizes many lichens impacts on community assembly processes and ecosystem functioning, how multiple species mixtures of lichens affect the key community- and ecosystem-level processes that they drive, the extent to which lichens in early succession influence vascular plant succession and ecosystem development in the longer term, and how global change drivers may impact on ecosystem functioning through altering the functional composition of lichen communities.

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“…STM appeared small compared with most non-aquatic lichens (Palmqvist et al, 1997(Palmqvist et al, , 1998(Palmqvist et al, , 2002 but some forest species have even lower values (Esseen et al, 2015). Because changes in STM of freshwater lichens were associated with opposite and proportional changes in Chla+ ergosterol concentrations in the tissues, living STM (photobiont + mycobiont) was similar in the various freshwater lichens.…”

Section: Discussionmentioning

confidence: 87%

Photosynthetic traits of freshwater lichens are consistent with the submersion conditions of their habitat

Coste

Chauvet

Grieu

et al. 2016

Ann. Limnol. - Int. J. Lim.

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 15742 Abstract -In this study, we compared the photosynthetic performance of epilithic freshwater lichens on siliceous stream rock submerged for: more than 9 (hyper-), 6-9 (meso-) or 3-6 months (sub-hydrophilic lichens). In the dry state, neither variable fluorescence nor respiration activity could be detected. In the wet state, rates of dark respiration (O 2 uptake and CO 2 production for immerged and in-air samples) were in the lower range of that reported for non-aquatic lichens. With 200 (under water) or 500 mmol.m , aerial), photosynthesis increased in sub-but became negative in hyper-hydrophilic species. After hydration, dry samples increased photosystem II (PSII) efficiency, which reached near steady state in < 6-7 min. Hyper-hydrophilic lichen took longer than sub-hydrophilic species. A long period of desiccation (4 months) had a negative effect on subsequent PSII photochemistry of hyper-but not of sub-hydrophilic hydrated lichens. When thalli were allowed to dehydrate, all types of lichens lost PSII activity after about 15-20 min. Deactivation was faster in the hyper-than in the sub-hydrophilic species. The metabolic traits presented here are thus consistent with the ecological amplitude of the freshwater lichens studied.

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Morphology influences water storage in hair lichens from boreal forest canopies

Cited by 44 publications

References 42 publications

Dehydration-induced responses of primary photosynthetic processes and spectral reflectance indices in Antarctic Nostoc commune

Dehydration-induced responses of primary photosynthetic processes and spectral reflectance indices in Antarctic Nostoc commune

How lichens impact on terrestrial community and ecosystem properties

Photosynthetic traits of freshwater lichens are consistent with the submersion conditions of their habitat

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