Physiology of Photosynthetic Organisms Within Biological Soil Crusts: Their Adaptation, Flexibility, and Plasticity

Green, T. G. Allan; Proctor, M. C. F.

doi:10.1007/978-3-319-30214-0_18

Cited by 40 publications

(31 citation statements)

References 150 publications

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“…This may be a result of spatially small-scale shading of, e.g. (Green & Proctor, 2016). This is well supported by our data with LSP consistently being over 900 µmol photons m -2 s -1 for both, C-BSCall and G-BSCall.…”

Section: Discussionsupporting

confidence: 77%

“…As light is one of the major drivers for photosynthetic rates in BSCs, the cardinal points in response to light were examined. For BSCs the light level compensating respiration normally is between 25 60 to 100 photons m-2 s -1 (Green & Proctor, 2016), which indicates comparability to classical "sun plant" features. Our results support these findings and the variation within our measurements, indicated by high standard deviations, reflects a very high sampling site internal variation.…”

Section: Discussionmentioning

confidence: 89%

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Eco-physiological characterization of early successional biological soil crusts in heavily human impacted areas – Implications for conservation and succession

Szyja

Büdel

Colesie

2017

Preprint

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Abstract. Eco-physiological characterization of photoautotrophic communities is not only necessary to identify the response of carbon fixation related to different climatic factors, but also to evaluate risks connected to changing environments. In 10 biological soil crusts (BSCs), the description of eco-physiological features is difficult, due to the high variability in taxonomic composition and variable methodologies applied. Especially for BSCs in early successional stages, the available datasets are rare or focused on individual constituents, although these crusts may represent the only photoautotrophic component in many heavily disturbed ruderal areas, like parking lots or building areas with increasing surface area worldwide. We analyzed the response of photosynthesis and respiration to changing BSC water contents, temperature and 15 light in two early successional BSCs. One BSC was dominated by the cyanobacterium Nostoc commune, the other by the green alga Zygogonium ericetorum. Independent of species composition, both crust types had convergent features like high light acclimatization and low or no depression in carbon uptake at water suprasaturation. This particular setup of ecophysiological features may enable these communities to cope with a high variety of climatic stresses, and may therefore be a reason for their success in heavily disturbed areas with ongoing human impact. Nevertheless, a major divergence between 20 the two BSCs was their absolute carbon fixation rate on a chlorophyll basis, which was significantly higher for the cyanobacterial crust. This study emphasizes the importance of measuring intact BSCs under natural conditions for collecting reliable data.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 89%

Eco-physiological characterization of early successional biological soil crusts in heavily human impacted areas – Implications for conservation and succession

Szyja

Büdel

Colesie

2017

Preprint

View full text Add to dashboard Cite

show abstract

“…To date, the processes that underpin acclimation to increasing temperature are poorly understood for BSC communities and lichens (Green & Proctor, 2016). Larson and Kershaw (1975) reported species-specific acclimation with some species showing seasonal changes in the net photosynthetic (NP) capacity with constant respiration and others responding in a manner similar to the process of cold hardening found in higher plants (Larson & Kershaw, 1975).…”

Section: Introductionmentioning

confidence: 99%

Can Antarctic lichens acclimatize to changes in temperature?

Colesie

Büdel

Hurry

et al. 2017

Global Change Biology

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The Antarctic Peninsula, a tundra biome dominated by lichens and bryophytes, is an ecozone undergoing rapid temperature shifts. Such changes may demand a high physiological plasticity of the local lichen species to maintain their role as key drivers in this pristine habitat. This study examines the response of net photosynthesis and respiration to increasing temperatures for three Antarctic lichen species with different ecological response amplitudes. We hypothesize that negative effects caused by increased temperatures can be mitigated by thermal acclimation of respiration and/or photosynthesis. The fully controlled growth chamber experiment simulated intermediate and extreme temperature increases over the time course of 6 weeks. Results showed that, in contrast to our hypothesis, none of the species was able to down-regulate temperature-driven respiratory losses through thermal acclimation of respiration. Instead, severe effects on photobiont vitality demonstrated that temperatures around 15°C mark the upper limit for the two species restricted to the Antarctic, and when mycobiont demands exceeded the photobiont capacity they could not survive within the lichen thallus. In contrast, the widespread lichen species was able to recover its homoeostasis by rapidly increasing net photosynthesis. We conclude that to understand the complete lichen response, acclimation processes of both symbionts, the photo- and the mycobiont, have to be evaluated separately. As a result, we postulate that any acclimation processes in lichen are species-specific. This, together with the high degree of response variability and sensitivity to temperature in different species that co-occur spatially close, complicates any predictions regarding future community composition in the Antarctic. Nevertheless, our results suggest that species with a broad ecological amplitude may be favoured with on-going changes in temperature.

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“…At meso-climatic scales, such orographic clouds increase moisture and humidity on upper mountain slopes, with considerable effect on the local biota, which may locally deviate from general trends (Cereceda et al 2002;Scholl et al 2007;Cochrane 2011;Sawaske & Freyberg 2015). For polar regions we found no studies linking the biodiversity, densities or biomass of biota to orographic clouds, although the relationship between humidity and biocrusts in the Antarctic is briefly discussed by Green & Proctor (2016). In fact, the orographic clouds are not only typical for tropical mountain forests (Pounds et al 1999) and deserts (Cáceres et al 2007) but are also common in polar regions, including Victoria Land (Zibrodi & Frezzotti 1996).…”

Section: Orographic Clouds: Potential Source Of Watermentioning

confidence: 68%

A nematode in the mist: Scottnema lindsayae is the only soil metazoan in remote Antarctic deserts, at greater densities with altitude

et al. 2019

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Physiology of Photosynthetic Organisms Within Biological Soil Crusts: Their Adaptation, Flexibility, and Plasticity

Cited by 40 publications

References 150 publications

Eco-physiological characterization of early successional biological soil crusts in heavily human impacted areas – Implications for conservation and succession

Eco-physiological characterization of early successional biological soil crusts in heavily human impacted areas – Implications for conservation and succession

Can Antarctic lichens acclimatize to changes in temperature?

A nematode in the mist: Scottnema lindsayae is the only soil metazoan in remote Antarctic deserts, at greater densities with altitude

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