Activity pattern of the moss Hennediella heimii (Hedw.) Zand. in the Dry Valleys, Southern Victoria Land, Antarctica during the mid-austral summer

Pannewitz, Stefan; Green, T. G. A.; Scheidegger, Christoph; Schlensog, M.; Schroeter, B.

doi:10.1007/s00300-003-0518-8

Cited by 32 publications

(38 citation statements)

References 28 publications

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“…In many (perhaps all) of these species, photosynthetic electron flow inferred from chlorophyll fluorescence does not saturate, but continues to rise (often near linearly) at high irradiance (Marschall and Proctor 2004;Proctor and Smirnoff 2011). Similar non-saturating electron flow has been reported by Pannewitz et al (2003) for Hennediella heimii in the Antarctic. In the species that have been investigated (Schistidium apocarpum (s.l.…”

Section: Responses To Excess Lightmentioning

confidence: 59%

“…Optimal temperatures in polar regions are low. Mosses from the Ross Sea region had optima of 6.8 C for Ceratodon purpureus, 9.1 to 15.9 C for Bryum argenteum, and 12.0 C for Bryum pseudotriquetrum (Pannewitz et al 2003), while green algal lichen biocrusts ranged from 5 C at Darwin area (80 S latitude) to 17 C at Homburg (Germany, 50 N;Colesie et al 2014b). Biocrusts in arid areas range from 21 C (Fulgensia fulgens, Diploschistes diacapsis) to 29 to 32 C, Collema tenax, Cladonia convoluta, Squamarina lentigera, and Collema cristatum (Table 18.1).…”

Section: Temperaturementioning

confidence: 99%

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

Green

Proctor

2016

Ecological Studies

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Section: Responses To Excess Lightmentioning

confidence: 59%

Section: Temperaturementioning

confidence: 99%

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

Green

Proctor

2016

Ecological Studies

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“…As a result the active times of lichens are mainly confined to the two summer months at Botany Bay (778 S) compared to the whole year at Livingston Island (628 S) . However, photosynthesizing organisms in the former region can experience incident PAR exceeding nominal full sunlight, 2000 lmol photonsÁm À2 Ás À1 (Pannewitz et al 2003a, Schroeter et al 2011. Little evidence exists that naturally occurring levels of PAR or UV radiation are major limiting factors for autotrophs in Antarctica (Kappen et al 1998a, Clarke and Robinson 2008, Schroeter et al 2012.…”

Section: Solar Radiationmentioning

confidence: 99%

“…In the Antarctic Peninsula, as in alpine areas, snow cover can protect plants and animals from erosion, excessive desiccation, and extreme cold (Winkler et al 2000, Block et al 2009). In contrast, snowbanks on the continent, while still providing insulation, can lead to early summer temperatures remaining well below the air temperature, which is significant, as most lichens and mosses do not become metabolically active until temperatures rise above freezing (Pannewitz et al 2003a). Attenuation of light can further result in vegetation being below the compensation point for photosynthesis.…”

Section: Ice and Snowmentioning

confidence: 99%

The spatial structure of Antarctic biodiversity

Convey

Chown

Clarke

et al. 2014

Ecological Monographs

305

296

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Patterns of environmental spatial structure lie at the heart of the most fundamental and familiar patterns of diversity on Earth. Antarctica contains some of the strongest environmental gradients on the planet and therefore provides an ideal study ground to test hypotheses on the relevance of environmental variability for biodiversity. To answer the pivotal question, “How does spatial variation in physical and biological environmental properties across the Antarctic drive biodiversity?” we have synthesized current knowledge on environmental variability across terrestrial, freshwater, and marine Antarctic biomes and related this to the observed biotic patterns. The most important physical driver of Antarctic terrestrial communities is the availability of liquid water, itself driven by solar irradiance intensity. Patterns of biota distribution are further strongly influenced by the historical development of any given location or region, and by geographical barriers. In freshwater ecosystems, free water is also crucial, with further important influences from salinity, nutrient availability, oxygenation, and characteristics of ice cover and extent. In the marine biome there does not appear to be one major driving force, with the exception of the oceanographic boundary of the Polar Front. At smaller spatial scales, ice cover, ice scour, and salinity gradients are clearly important determinants of diversity at habitat and community level. Stochastic and extreme events remain an important driving force in all environments, particularly in the context of local extinction and colonization or recolonization, as well as that of temporal environmental variability. Our synthesis demonstrates that the Antarctic continent and surrounding oceans provide an ideal study ground to develop new biogeographical models, including life history and physiological traits, and to address questions regarding biological responses to environmental variability and change.

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“…This phenomenon has been demonstrated for B. frigida at Botany Bay (Kappen et al 1998). Lichens beneath the snow are not photosynthetically active because of the low light levels and also because they remain cold due to the insulating properties of the snow (Pannewitz et al 2003). Because of this there is a lichen desert under the longer remaining snow which is only revealed in seasons of more extensive melt.…”

Section: Discussionmentioning

confidence: 91%

Flora and vegetation of Cape Hallett and vicinity, northern Victoria Land, Antarctica

et al. 2015

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Cape Hallett (72°19 0 S; 170°13 0 E) lies at the northern end of the western coastline of the Ross Sea region, and, to date, there appears to be no full description of its terrestrial flora despite its probable importance in understanding links between biodiversity and latitude. Here we present information about lichens and mosses from published papers, herbarium collections and personal surveys for Cape Hallett and seven nearby sites. A total of 59 lichen and 11 moss species are reported for these eight sites. Cape Hallett is one of the richest sites for terrestrial biodiversity in the Ross Sea region with about 46 lichen species and nine species of bryophytes. Lichens have their greatest diversity on the upper scree and summit area (30 species, 330 m), the least within the large penguin colony at sea level (one species). The station at Cape Hallett was established in 1957, and some of the earliest ecological and ecophysiological studies in Antarctica were carried out there. Historical comparisons are possible and have revealed considerable changes in vegetation in the lower flush area, a high level of frost heave disturbance, new lichen growth rate estimates for northern Victoria Land and extreme stability of the snow banks on the scree slopes. Cape Hallett represents a very important site for studies on links between terrestrial flora and the environment as well as on possible effects of climate change.

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Activity pattern of the moss Hennediella heimii (Hedw.) Zand. in the Dry Valleys, Southern Victoria Land, Antarctica during the mid-austral summer

Cited by 32 publications

References 28 publications

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

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

The spatial structure of Antarctic biodiversity

Flora and vegetation of Cape Hallett and vicinity, northern Victoria Land, Antarctica

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