Keywords: ECOPHYSIOLOGY/ COLD RESISTENCE/ TEMPERATURE
Abstract: 2 fig. 1 tab. [English summary.]
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Keywords: COLD INJURY/ TEMPERATURE/ ADAPTATIONS
Abstract: 13 fig. 3 tab. ["Cold injury conclusively may only occur when ice is formed within the cells."--English summary.]
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Keywords: RAMALINA/ ISRAEL/ SEXUAL REPRODUCTION/ APOTHECIA/ NEGEV DESERT
Abstract: 1 pl.
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Keywords: PHOTOSYNTHESIS/ ANTARCTICA/ PHYSIOLOGY/ ADAPTATIONS
Abstract: 6 fig.
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Keywords: EXTREME ENVIRONMENT / ADAPTATION ECOLOGY / REVIEW
Abstract: [Detailed review; many references.]
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Keywords: ADAPTATIONS/ ECOLOGY/ EVOLUTION/ DESERTS/ RAMALINA
Abstract: [Includes the classic example of Ramalina maciformis.]
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Keywords: PRIMARY PRODUCTION/ ECOLOGY/ BIOMASS/ DESERT/ PHYSIOLOGY
Abstract: 13 figures.
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Keywords: ADAPTATIONS/ DESERT/ TEMPERATURES/ WATER REALTIONS/ ECOLOGY
Abstract: 11 figures.
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Keywords: ECOPHYSIOLOGY/ WATER RELATIONS/ NEGEV/ DESERT/ ISRAEL/ DEW
Abstract: 11 figures. 4 tables. [In addition to considerable data presented on gas exchange in relation to light, temperature and water content, the authors conclude that, "The existence of many lichens in the Negev is only possible because of the high frequency and regularity of dew-falls."]
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Keywords: ANTARCTIC/ CRYPTOENDOLITHIC/ BUELLIA/ SAXICOLOUS
Abstract: 2 figures. [Specimens are tentatively placed in the genus Buellia.]
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Keywords: ECOPHYSIOLOGY/ ISRAEL/ DESERT/ PHOTOSYNTHESIS/ WATER RELATIONS/ NEGEV
Abstract: 3 tables. 6 figures. [The high lichen density and species richness are highest on northern exposures due, at least in part, to higher rates of dew imbibition and greater net photosynthetic production.]
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Keywords: CLADONIA/ HAWAII/ STEAM VENTS/ TEMPERATURE/ HEAT TOLERANCE/ CLADINA
Abstract: 3 tables. 4 figures. ["With respect to heat tolerance only Campylopus can be considered as adapted to the hot environment. Therefore it is able to colonize the hot dry soil while deriving its moisture from adjacent steam vents. The lichens, particularly Cl. skottsbergii, are not adapted and are as sensitive to heat as most other lichens."]
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Keywords: EPIPHYTES/ AIR POLLUTION/ EPILITHIC/ GERMANY/ WURZBURG
Abstract: 3 tables. 4 figures. [Epiphytic species show better correlations with air pollution levels in the area than do correlations with the epilithic species. Other distributional and pollution data are presented for the 90 species in the area.]
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Keywords: ANTARCTIC/ CRYPTOENDOLITHIC/ ECOLOGY/ MICROCLIMATE/ PHOTOSYNTHESIS
Abstract: 2 tables. 9 figures. ["It was estimated tentatively that, on an overcast day, cryptoendolithic lichens may have been photosynthetically active for about 15 h, although these conditions were suboptimal. On a clear and windy day, photosynthesis may have been possible for 11 h, with 4 h optimal activity. On a clear, warm and clam day, the estimates amounted to 13.5 and 6.5 h, respectively."]
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Keywords: DESERT/ ADAPTATION/ ECOLOGY/ REVIEW/ NICHE
Abstract: 1 table. 2 figures. [General review concluding that "... adaptation of lichens to arid environments means in all cases the occupation of a certain ecological niche which is a kind of oasis."]
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Keywords: SYMPOSIUM/ DESERTS/ BOTANICAL CONGRESS
Abstract: [Introductory remarks.]
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Keywords: PHOTOSYNTHESIS/ SONORAN DESERT/ PARMELIA/ XANTHOPARMELIA/ ACAROSPORA/ LIGHT/ TEMPERATURE/ ADAPTATION
Abstract: 2 figures. [Study on Parmelia kurokawae and Acarospora schleicheri during drying under four light regimes and five temperatures. "The relatively low temperature optima reflect the fact that the lichens are most active in winter, particularly in early morning hours."]
[Edit/Delete] [Upload PDF/URL] [ET: 1043]
Keywords: ANTARCTIC/ CRYPTOENDOLITHIC/ SOUTHERN VICTORIA LAND/ CO2 EXCHANGE/ PHOTOSYNTHESIS/ TEMPERATURE/ ECOLOGY/ ADAPTATION
Abstract: 2 tables. 6 figures. ["The results indicate that these cryptoendolithic lichens are not more adapted to low temperatures than are crustose lichens from coastal Antarctica. Calculations show that optimum temperatures for photosynthesis may not be reached in the natural environment."]
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Keywords: OWN/ CRYPTOENDOLITHIC/ ANTARCTICA/ PHOTOSYNTHESIS
Abstract: 1 figure. [Brief review of photosynthetic capabilities of the cryptoendolithic lichens of Antarctica.]
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Keywords: ADAPTATIONS/ OWN/ EXTREME ENVIRONMENTS/ ANTARCTICA/ COLD/ CRYPTOENDOLITHIC
Abstract: 2 tables. 6 figures. [Adaptation of plants to cold environments is discussed with particular emphasis on the cryptogams of Antarctica, especially the cryptoendolithic lichens.]
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Keywords: ANTARCTIC/ USNEA/ ECOLOGY/ PHYSIOLOGY/ CHLOROPHYLL/ TEMPERATURE/ PHOTOSYNTHESIS/ ADAPTATION
Abstract: 9 figures. 1 table. [Both light and shade forms of this species "... differ by chlorophyll content and temperature dependency of net photosynthesis, which demonstrates an adaptive response of these forms to their environment."]
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Keywords: ANTARCTICA/ OWN/ EXPLOITATION/ IMPACT/ RESOURCES
Abstract: [Author states that much still needs to be learned about the Antarctic environment before exploration and exploitation of mineral resources should be considered. Lichens are mentioned.]
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Keywords: ANTARCTIC/ SOUTH SHETLAND ISLANDS/ MICROCLIMATE/ RAMALINA/ USNEA/ GROWTH/ ECOLOGY/ WATER RELATIONS/ OWN
Abstract: 1 table. 5 figures. [Lichen distribution on coastal rocks on King George Island, South Shetland Islands, was correlated with variations in thallus hydration in Ramalina terebrata and Usnea fasciata. Exposures favorable to fog had much richer lichen abundance and diversity although the temperatures were cooler in these northwest and west rock slopes.]
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Keywords: ANTARCTIC/ TEMPERATURE/ ECOLOGY/ CLIMATE/ GROWTH/ PHYSIOLOGY
Abstract: 6 figures. ["From a comparison of diurnal courses of the microclimate of lichen habitats in the maritime Antarctic with those of the desertic continental Antarctic, it is apparent that temperature conditions are in the same range (6 - 8 C) in all habitats during days when lichens are soaked and active."]
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Keywords: ANTARCTIC/ VICTORIA LAND/ ECOLOGY/ BIOMASS/ PHYTOSOCIOLOGY/ OWN
Abstract: 3 figures. 5 tables. [Reports 42 lichen species and 5 bryophytes from this ice-free area in Antarctica, including ecological observations and community analyses. "Pattern and density of vegetation characterized the area as probably more desertic than others investigated in eastern Antarctica, although locally a biomass of up to 1 kg m-2 was found."]
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Keywords: ANTARCTIC/ VICTORIA LAND/ ECOLOGY/ MICROCLIMATE/ UMBILICARIA/ USNEA/ OWN
Abstract: 9 figures. 10 tables. [Reports on the sheltering effect on growth of lichens and microclimatic measurements. "The presence of lichens was dependent on the moisture conditions of the habitat. It was observed that snow ... accumulated in summer only in deeper levels between rocks, and that the snow rapidly melted on contact with the lichens. The lichens in soaked state had always less than optimum temperatures for net photosynthesis. The rock gaps at Birthday Ridge form oases, the only localities where moisture is provided, and temperature is high enough to enable growth of lichens and mosses."]
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Keywords: ANTARCTIC/ USNEA/ PHYSIOLOGY/ WATER REALTIONS/ ADAPTATION/ ECOLOGY/ PHOTOSYNTHESIS
Abstract: 2 tables. 10 figures. [Distinct differences were found when comparing the two species in these distinct environments with respect to several ecophysiological parameters; however, "there is no difference between the species with respect to the moisture dependency of net photosynthesis. Thus, U. sulphurea, in the dry continental Antarctic, needs particular localities where sufficient moisture is available."]
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Keywords: ANTARCTIC/ RAMALINA/ PHOTOSYNTHESIS/ PHYSIOLOGY
Abstract: 3 figures. [Study on Ramalina terebrata in the maritime Antarctic for a one month period.]
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Keywords: ANTARCTIC/ SOUTH SHETLAND ISLANDS/ ECOPHYSIOLOGY/ PHOTOSYNTHESIS/ USNEA/ HIMANTORMIA
Abstract: 11 figures. [Study on King George Island, South Shetland Islands, on Usnea antarctica and other Antarctic species. "Our preliminary field data demonstrate that Antarctic lichen species from the same area have a very differing photosynthetic productivity." Opitma are low temperatures and moderate light, while very high water content reduces photosynthetic capacity.]
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Keywords: RAMALINA/ USNEA/ WATER RELATIONS/ PHOTOSYNTHESIS/ HIMANTORMIA/ ANTARCTIC/ COMPETITION
Abstract: 2 tables. 14 figures. [Study on Ramalina terebrata, Usnea fasciata and Himantormia lugubris. Authors postulate that the prostrate growth form of U. fasciata is degraded as a result of bryophyte competition. "All lichens were capable of absorbing water from a saturated atmosphere."]
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Keywords: TRENTEPOHLIA/ TREBOUXIA/ COLD RESISTANCE/ ROCCELLACEAE/ MEXICO/ ECOPHYSIOLOGY/ ALGAE/ PHOTOBIONTS
Abstract: 1 table. 3 figures. [Six hour cold treatments of -5 to -78 C. "From these results and previous publications it is inferred that lichens in general from the Roccellaceae, a family characterized by species with Trentepohlia, are more susceptible to frost than lichens with Trebouxia." The results help to explain the general distribution pattern of the Roccellaceae.]
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Keywords: COLD RESISTANCE/ UMBILICARIA/ NIEBLA/ DENDROGRAPHA/ ECOPHYSIOLOGY/ TRENTEPOHLIA
Abstract: 1 figure. ["Lichens are quite frost resistant in comparison with other plant groups. Nevertheless, a wide range in degree of frost resistance exists among species, the most frost susceptible of which are apparently the Trentepohlia-containing species."]
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Keywords: ANTARCTICA/ SOUTH SHETLAND ISLANDS/ CALOPLACA/ MAGASPORA/ LECIDELLA/ VERRUCARIA
Abstract: 1 figure. [Fifty species are reported. Notable finds include Caloplaca tiroliensis, C. tetraspora, Megaspora verrucosa, Lecidella wulfenii, and Verrucaria cylindrophora.]
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[ET: 773|7]
Keywords: ANTARCTIC/ SYMPOSIUM
Abstract: 1 figure. [Introductory comments to a collection of papers based on a symposium held at the University of Kiel in 1987.]
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Keywords: ECOPHYSIOLOGY/ GEOGRAPHY/ PHOTOSYNTHESIS/ ADAPTATIONS/ REVIEW
Abstract: 12 tables. 44 figures. [Exhaustive review of ecophysiological topics relating to lichens with special emphasis on non-temperate regions. Article includes a bibliography of 267 references. Major subdivisions of the chapter include: Wet Forest Habitat, Semiarid and Arid Regions, Arctic and Apline Regions, and Antarctic Region.]
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Keywords: ANTARCTICA/ ADAPTATIONS/ GENERAL/ REVIEW/ ECOPHYSIOLOGY
Abstract: 7 unnumbered photographs (6 in color). [Popular account of lichen adaptations to the Antarctic environment.]
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Keywords: ANTARCTIC/ RAMALINA/ PHOTOSYNTHESIS/ CO2 EXCHANGE/ WATER RELATIONS
Abstract: 6 figures. ["Continuous measurements of light, temperature and thallus water content at the natural habitat during December 1984 were used to calculate the daily courses of CO2 exchange of R. terebrata by means of the models. As a result, the mean carbon production in this Antarctic summer month was found to be remarkably high. A relatively high growth rate seems to be indicated also by 14C-age analyses in fruticose lichens of the maritime Antarctic botanical zone."]
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Keywords: ANTARCTICA/ DISPERSAL/ LECIDEA/ BUELLIA
Abstract: 2 tables. 3 figures. ["It seems that the presence of cryptogamic species in the maritime Antarctic zone is predominantly the result of long-distance transport from neighbouring South America and a selection of climatic factors." Authors also conclude, " ... the cryptogams of most of the Antarctic continent may represent a largely relictual flora which survived in ice-free refugia."]
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Keywords: USNEA/ ANTARCTICA/ MICROCLIMATE/ MODELS/ ECOPHYSIOLOGY
Abstract: 4 tables. 5 figures. [Study conducted in Wilkes Land, Antarctica. "Sharp boundaries of vegetation along the top of the rock indicate that other factors than only light, temperature and humidity as monitored for this study are most important for lichen growth. Hence, other factors such as wind stress and ice blast, erosion and chilling effects, should be considered as to be of much higher power in determining areas of possible plant growth."]
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Keywords: ANTARCTIC/ RINODINA
Abstract: 1 table. 1 figure. [Discussion of spore size and other features of Rinodina turfacea, R. olivaceobrunnea and R. 'archaeoides'.]
[Edit/Delete] [Upload PDF/URL] [ET: 774|7]
Keywords: ANTARCTICA/ USNEA/ CO2 EXCHANGE/ PHOTOSYNTHESIS/ ECOPHYSIOLOGY/ WATER RELATIONS
Abstract: 1 figure. ["Carbon dioxide uptake was detected down to -10 C. The carbon production during such a 'frost' day was considerable for a slow-growth Antarctic lichen. The mechanism of water uptake when the thalli are frozen needs further investigation."]
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Keywords: ANTARCTIC/ ECOPHYSIOLOGY/ PHOTOSYNTHESIS/ STRESS/ TEMPERATURE/ WATER RELATIONS
Abstract: 4 fig. 1 tab.
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Keywords: ANTARCTICA/ CO2 EXCHANGE/ SCHISTIDIUM/ PHOTOSYNTHESIS
Abstract: 9 figures. [Although primarily an article concerning this moss species, the authors mention some associated lichen species.]
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Keywords: PHOTOSYNTHESIS/ WATER RELATIONS/ SPAIN/ UMBILICARIACEAE/ ADAPTATION
Abstract: 2 tables. 7 figures. ["Water saturation and water loss rate were dependent on morphology and particularly anatomy of the thallus. The physiological and structural data are useful in the interpretation of the ecology and altitudinal distribution of the Umbilicariaceae. No adaptation could be linked to particularities of the Mediterranean climate."]
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Keywords: ANTARCTICA/ USNEA/ NEUROPOGON/ HUMAN IMPACT/ GROWTH/ ECOPHYSIOLOGY
Abstract: 3 tables. 3 figures. [Author estimates that regrowth of Usnea sphacelata to normal size in impacted areas around Antarctic stations would take approximately 300 years based on estimated growth rates from photosynthetic productivity data.]
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Keywords: ANTARCTICA/ ECOLOGY/ SNOW COVER/ WILKES LAND/ PHYTOSOCIOLOGY
Abstract: 2 tables. 7 figures. [Phytosociological study based on 105 releves. "The vegetation is highly dependent on the extent and duration of a shallow snow cover, because snow is the main water source for the poikilohydrous cryptogams." Several community types are described and comparisons made with Arctic and alpine communities.]
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Keywords: ANTARCTICA/ PHOTOSYNTHESIS/ POROMETER/ RESPIRATION/ PHYSIOLOGY/ CRUSTOSE
Abstract: 5 figures. 1 table. ["The data presented here demonstrate the first successful in situ measurements of the CO2 exchange of crustose lichens."]
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Keywords: ANTARCTIC/ PHOTOSYNTHESIS
Abstract: 3 fig.
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Keywords: ANTARCTIC/ SOUTH SHETLAND ISLANDS
Abstract: 1 fig. [Reports 72 species; new to Antarctica: Umbilicaria nylanderiana.]
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Keywords: ANTARCTICA/ PHOTOSYNTHESIS/ SOUTH SHETLAND ISLANDS
Abstract: 3 fig.
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Keywords: ANTARCTICA/ PHOTOSYNTHESIS/ SNOW/ WATER RELATIONS
Abstract: 6 fig. ["In the second of three field studies on the ecology and physiology of lichens on Clark Peninsula, Wilkes Land, Antarctica, photosynthetic activity due to natural and artificial soaking of lichen thalli was investigated. Gravimetric measurements were used to quantify water uptake by lichens in contact with snow or ice. Quantum flux density under a 15 cm thick layer of snow can reach light saturation for net photosynthesis of Usnea sphacelata at temperatures around 0°C. Measurements with a steady-state CO2 diffusion porometer in the field reveal that, in Usnea antarctica, Umbilicaria decussata, and U. aprina, the optimum water content for net photosynthesis was 75-115 % d. wt. after the thalli were sprayed with water or submerged. The depression of net photosynthesis at super-optimal water content was strong in these species. In naturally soaked Usnea sphacelata this depression was less apparent. The water content resulting from contact with snow is frequently near the optimum for photosyntheis. In lichens of continental Antarctica it seems that super-optimal water contents are the exception rather than the rule."]
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Keywords: BIOGRAPHY/ LANGE
Abstract: [A brief biography, honoring Professor Lange in his 65th year.]
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Keywords: ANTARCTICA/ BIOGEOGRAPHY/ THALLOCONIDIA/ UMBILICARIA
Abstract: 4 fig. [Five species are reported from the area. New to Antarctica: Umbilicaria africana, U. krascheninnikovii, U. nylanderiana.]
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Keywords: ANTARCTIC/ CO2 EXCHANGE/ CRUSTOSE/ FLUORESCENCE YIELD/ INSTRUMENT/ PHOTOSYNTHESIS/ WATER CONTENT
Abstract: 5 fig. 2 tab. ["CO2 exchange and fluorescence yield of the crustose lichen Buellia frigida were measured in situ by means of a CO2 porometer and a PAM-2000, a newly developed portable fluorescence system....It proved possible, using the PAM-2000, to differentiate the physiological performance of the thallus centre and the marginal lobes. The distribution of water in the thallus during a drying cycle was shown to be inhomogeneous. The photosynthetic rates of B. frigida calculated on an area basis are comparatively high and indicate that this lichen is well adapted to its habitat conditions in this part of continental Antarctica."]
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Keywords: AGE/ ANTARCTIC/ RADIOCARBON DATING
Abstract: 4 fig. 3 tab. ["...the age of mature thalli of Caloplaca regalis, Ramalina terebrata and Usnea antarctica was determined to 32 years, while U. aurantiaco-atra and Himantormia lugubris gave an age of ca. 38 years and ca. 60 years, respectively."]
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Keywords: ANTARCTIC/ BIOMASS/ CO2 EXCHANGE/ CRYPTOENDOLITHIC/ ENDOLITHIC/ PHOTOSYNTHESIS/ PRODUCTIVITY
Abstract: 14 fig. 3 tab. ["Annual gross productivity of the lichen-dominated cryptoendolithic community was calculated from a computer analysis of photosynthetic response based on laboratory measurements of CO2 exchange and three years (1985-1988) of field nanoclimate data."]
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Keywords: ALGAE/ REVIEW/ SYMBIOSIS
Abstract: 12 fig. [General review of the lichen symbiosis.]
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Keywords: ADAPTATIONS/ ANTARCTICA/ BIODETERIORATION/ BIOGEOGRAPHY/ BIOMASS/ COLONIZATION/ COLOR/ CRYPTOENDOLITHIC/ DISPERSAL/ GROWTH FORMS/ HABITATS/ HUMAN IMPACT/ LOW TEMPERATURES/ MINERAL NUTRITION/ NITROGEN FIXATION/ PHOTOSYNTHESIS/ POIKILOHYDRIC/ PRODUCTIVITY/ REPRODUCTION/ THALLUS COLOR/ VEGETATION/ WIND
Abstract: 22 fig. 4 tab. [Includes an introduction, and sections on weathering and nutrient relations, environmental adaptation, physiological adaptation, production and growth, and taxonomic and chorological aspects.]
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Keywords: COLD TEMPERATURES/ FREEZING/ ICE/ LIFE STRATEGIES/ PHOTOSYNTHESIS/ RESPIRATION/ SNOW/ WATER RELATIONS
Abstract: 5 fig. 3 tab. [Review article. "Based on recent investigations and literature, this paper discusses to what extent lichens are better adapted to snow and ice than vascular plants. Vascular plants in high latitudes have high freezing tolerances but are photosynthetically inactive in winter (e.g., evergreen coniferous species), while lichens in a highly freezing-tolerant stage can be active and productive under winter conditions. Vascular plants can be active under snow but have no photosynthesis if the tissue is frozen. Recent in situ measurements indicate that lichens are able to photosynthesize at temperatures below -10°C, apparently in the frozen state."]
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Keywords: ENDOLITHIC/ KAROOWIA/ MICROCLIMATE/ PHOTOSYNTHESIS/ PRODUCTIVITY/ SANDSTONE/ SOUTH AFRICA
Abstract: 14 fig. [Both epilithic (Acarospora, Paraparmelia chlorea, Peltula capensis, & Xanthoparmelia marroninipuncta) and endolithic lichens (Lecidea & Sarcogyne) were studied in the field. "Maximum photosynthetic rates of the investigated species were found at temperatures between 20°C and 30°C, far higher than the recorded optimum temperatures for lichens from temperate and and desert regions."]
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Keywords: ENERGY FLUX/ INTERACTIONS/ MYCOBIONT-PHOTOBIONT INTERACTIONS/ NUTRIENT EXCHANGE/ SYMBIOSIS/ TROPHIC CLASSES
Abstract: 5 fig. 2 tab. [Review article, considering the biology and interactions of the bionts in lichens, and the arguments regarding mutualism vs parasitism in the lichen association.]
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Keywords: ANTARCTICA/ DARK RESPIRATION/ PHOTOSYNTHESIS/ SNOW/ TEMPERATURE/ UMBILICARIA
Abstract: 5 fig.
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Keywords: ASPECT/ ECOLOGY/ ENDOLITHIC/ KAROOWIA/ MICROCLIMATE/ PHOTOSYNTHESIS/ SOUTH AFRICA/ TRANSVAAL
Abstract: 8 fig. 1 tab. [The in situ photosynthetic behaviour of endo- and epilithic lichens characteristic of two arid regions of South Africa was investigated.
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Keywords: IAL/ IAL2/ MEETING/ SYMPOSIUM
Abstract: [Papers from the IAL2 symposium, "Progress and Problems in Lichenology in the Nineties, " held in Hemmeslöv, Sweden, in 1992. Published in Vol. 4 (No. 2 and No. 3) and Vol. 5 (No. 1) of Cryptogamic Botany. The first section (Vol. 4, No. 2, 1994), "Ecology and Ecophysiology, " is dedicated to Professor Otto Lange, preeminent researcher on the ecology and physiology of lichens. The second section (Vol. 4, No. 3, 1994) is titled "Morphology and Development, " and the third and fourth sections (Vol. 5, No. 1, 1995) are titled "Chemistry and Chemotaxonomy" and "DNA and RNA Data in Lichen Studies" ]
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Keywords: ANTARCTIC/ PHOTOSYNTHESIS
Abstract: 1 fig.
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Keywords: ANTARCTIC/ ARCTIC/ CARBON EXCHANGE/ CO2 FIXATION/ GROWTH/ TEMPERATURE/ WATER RELATIONS
Abstract: 6 fig. 2 tab.
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Keywords: ANATOMY/ CHLOROPHYLL CONTENT/ CO2 EXCHANGE/ ECOTYPES/ INFRASPECIFIC VARIATION/ MORPHOLOGY/ PHOTOSYNTHESIS/ TRANSPLANTS/ WATER RELATIONS
Abstract: 6 fig. ["Five populations of the circumpolar Arctic-alpine lichen species Cetraria nivalis were sampled along a latitudinal gradient from the temperate to the Arctic climatic zone. The populations were compared with respect to their CO2 exchange, water relations and morphology/anatomy."]
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Keywords: ANTARCTIC/ CHLOROPHYLL FLUORESCENCE/ CO2 EXCHANGE/ ELECTRON TRANSPORT RATE/ PHOTOSYNTHESIS/ PHOTOSYSTEM II
Abstract: 4 fig. [Study of Umbilicaria aprina and Bryum argenteum.]
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Keywords: ANTARCTIC/ HUMIDITY/ MARITIME/ MICROCLIMATE/ PHOTOSYNTHESIS/ PRIMARY PRODUCTION/ SEASONAL FLUCTUATIONS/ USNEA
Abstract: 12 fig. ["Photosynthetic photon flux density (PPFD), air relative humidity and thallus temperature (TT) were measured in Usnea antarctica over a period of 12 months at a coastal rock on King George Island, South Shetland Islands."]
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Keywords: COLD TEMPERATURES/ FREEZING/ PHOTOSYNTHESIS/ RESPIRATION/ TEMPERATURE/ UMBILICATE/ WINTER
Abstract: 6 fig. ["The photosynthetic performance of Lasallia pustulata and Umbilicaria spodochroa was measured both in the field on granitic rock in southern Norway and in the laboratory under controlled conditions of light and temperature."]
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Keywords: COLD RESISTANCE/ FREEZING/ LOW TEMPERATURE/ PHOTOSYNTHESIS/ POIKILOHYDRIC/ TEMPERATURE/ WATER RELATIONS
Abstract: 9 fig. ["Laboratory measurements show that lichens are extremely tolerant of freezing stress and of low-temperature exposure. Metabolic activity recovered quickly after severe and extended cold treatment. Experimental results demonstrate also that CO2 exchange is already active at around -20°C. The psychrophilic character of polar lichen species is demonstrated by optimum temperatures for net photosynthesis between 0 and 15°C. In situ measurements show that lichens begin photosynthesizing below 0°C if the dry thalli receive fresh snow. The lowest temperature measured in active lichens was -17°C at a continental Antarctic site. The fine structure and the hydration state of photobiont and mycobiont cells were studied by low-temperature scanning electron microscopy (LTSEM) of frozen hydrated specimens."]
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Keywords: COMPETITION/ GROWTH FORMS/ INTRATHALLINE VARIABILITY/ LASALLIA/ PHOTOSYNTHESIS/ SIZE/ WATER RELATIONS
Abstract: 3 fig. [Study of intrathalline moisture gradients, and its effect on photosynthesis and competitive interactions between thalli.]
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Keywords: LANGE
Abstract: [A collection of 24 diverse papers, compiled in honor of the eminent German lichenologist Otto L. Lange, known particularly for his many pioneering works on lichen ecology and water relations.]
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Keywords: ANTARCTIC/ GENERAL TEXTBOOK
Abstract: 8 fig.
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Keywords: ANTARCTIC/ CO2 EXCHANGE/ LEPTOGIUM/ LIGHT/ MARITIME/ PHOTOSYSTEM II/ TEMPERATURE
Abstract: 4 fig. [... L. puberulum is well adapted to tolerate extreme irradiance conditions likely to impact lichens growing in meltwater flurries without any need for damage-repair-cycles."]
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Keywords: ANTARCTICA/ CYANOLICHENS/ DARK RESPIRATION/ LEPTOGIUM/ MARITIME/ MELTWATER/ PHOTOSYNTHESIS/ RESPIRATION
Abstract: 4 fig. 1 tab. [This lichen is particularly adapted to habitats with springtime meltwater.]
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Keywords: ANTARCTICA/ PHOTOSYNTHESIS/ SNOW/ TEMPERATURE/ UMBILICARIA/ WATER RELATIONS
Abstract: 8 fig. [From the Proceedings of an International Workshop on Polar Desert Ecosystems, held in Christchurch, New Zealand, 1-4 July 1996. "In this paper we demonstrate to what extent lichens are able to profit from snow as a water source for rehydration under the extreme environmental conditions in Continental Antarctica. Net photosynthesis of the foliose macrolichen Umbilicaria aprina occurred at subzero temperatures in the field even when snow was the only water source."]
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Keywords: ANTARCTIC/ CHLOROPHYLL FLUORESCENCE/ CO2/ GAS EXCHANGE/ PHOTOSYNTHESIS/ PRIMARY PRODUCTION
Abstract: 3 fig.
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Keywords: CO2 EXCHANGE/ DARK RESPIRATION/ ENDOLITHIC/ PHOTOSYNTHESIS/ SOUTH AFRICA/ TEMPERATURE
Abstract: 9 fig.
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Keywords: COMMUNITIES/ HUMIDITY/ LIGHT/ MOISTURE/ SCHIST/ SUBARCTIC/ SWEDEN/ TEMPERATURE
Abstract: 5 fig. [Study of the effect of light, temperature, and relative humidity in lichen communities on garnet-mica-schist boulders near Abisko in northern Sweden. (From the IAL3 Symposium, held Sept. 1-7, 1996, in Salzburg, Austria, Poster Contributions.)]
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Keywords: CHLOROPHYLL/ CHLOROPHYLL FLUORESCENCE/ CO2/ ELECTRON TRANSPORT RATE/ GAS EXCHANGE/ PHOTOSYNTHESIS/ RESPIRATION
Abstract: 7 fig. [Study of Umbilicaria aprina and Bryum argenteum.]
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Abstract: 6 fig. 2 tab.
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Keywords: COLD/ EXTREME ENVIRONMENTS/ HOT/ STRESS/ TEMPERATURE
Abstract: [Abstract from presentation at IMC6, held in Jerusalem, August 23-28, 1998.]
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Keywords: CHLOROPHYLL/ CO2 EXCHANGE/ FLUORESCENCE/ LIGHT/ TEMPERATURE/ UMBILICARIA
Abstract: 5 fig. [Simultaneous field measurements of CO2 exchange and chlorophyll a fluorescence indicate no photoinhibition when the lichen was exposed to strong sun irradiance for nearly 11 hours a day.]
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Keywords: ANTARCTIC/ BUELLIA/ LIGHT/ MELTWATER/ MICROCLIMATE/ PATTERNING
Abstract: 4 fig. 1 tab.
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Keywords: ANTARCTICA/ PHYTOSOCIOLOGY/ VEGETATION
Abstract: 1 fig. [Study on Potter Peninsula of the South Shetland Islands.]
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Keywords: ANTARCTIC/ CHIONOPHILY/ CO2 EXCHANGE/ MARITIME/ PHOTOSYNTHESIS/ TEMPERATURE
Abstract: 1 fig. [Study using Himantormia lugubris and Lecidea sciatrapha.]
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Keywords: ANTARCTIC/ PHOTOSYNTHESIS/ SEASONAL VARIATION/ SNOW/ TEMPERATURE/ WATER RELATIONS
Abstract: 3 fig.
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Keywords: ANATOMY/ CO2 EXCHANGE/ PHOTOSYNTHESIS/ STRUCTURE/ SYMBIOSIS
Abstract: 3 fig. 2 tab.
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Keywords: ADAPTATIONS/ ANTARCTICA/ BIODIVERSITY
Abstract: [Abstract.]
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Keywords: DESICCATION/ PHOTOPROTECTION/ PHOTOSYNTHESIS/ POIKILOHYDRIC/ REVIEW/ TEMPERATURE/ WATER RELATIONS
Abstract: 13 fig. 4 tab. [Review.]
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Keywords: CONSERVATION/ ECOLOGY/ GERMANY/ LOBARIA/ SWITZERLAND
Abstract: [Abstract.]
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Keywords: ANTARCTICA/ SOUTH SHETLAND ISLANDS
Abstract: 2 fig. [Reports 110 lichen species, which is said to be the highest number reported for any single Antarctic locality.]
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Keywords: ANTARCTIC/ ARCTIC/ CARBON BALANCE/ MICROHABITAT/ PHOTOSYNTHESIS/ RESPIRATION/ REVIEW/ WATER RELATIONS
Abstract: 7 fig. 3 tab. [Review.]
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Keywords: CARBON FIXATION/ ECOPHYSIOLOGY/ GAS EXCHANGE/ HABITATS/ LOBARIA/ METABOLISM/ MICROCLIMATE/ SWITZERLAND
Abstract: [Abstract from the International Association for Lichenology's fourth symposium, held in Barcelona, Spain, 3-8 September 2000.]
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Keywords: ANTARCTIC/ CARBON BALANCE/ MARITIME/ MICROCLIMATE/ PHOTOSYNTHESIS/ PRIMARY PRODUCTION/ USNEA
Abstract: 3 fig. 1 tab. ["Spring is the most productive season of the year and the annual carbon gain is mainly determined by the carbon gain in the spring months."]
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Keywords: ANTARCTIC/ MARITIME/ SNOW COVER/ VEGETATION
Abstract: [Abstract from the International Association for Lichenology's fourth symposium, held in Barcelona, Spain, 3-8 September 2000.]
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Keywords: ASCOMATA/ CHLOROPHYLL CONTENT/ LECANORINE/ PHOTOSYNTHESIS/ RESPIRATION/ SEXUAL REPRODUCTION/ TELOSCHISTES
Abstract: 4 fig. 1 tab.
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Keywords: ANTARCTIC/ COLONIZATION/ ECOPHYSIOLOGY/ FLORISTICS/ GROWTH/ GROWTH FORMS/ ION UPTAKE/ PEDOGENESIS/ SOIL FORMATION/ SUCCESSION/ WATER RELATIONS
Abstract: 1 fig. 3 tab.
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Keywords: BALEARIC ISLANDS/ ISLANDS/ MENORCA
Abstract: 8 fig. 1 tab. [New to the Balearic Islands: Arthonia spadicea, Byssoloma subdiscordans, Caloplaca atroflava, C. festivella, Collema crispum, C. polycarpon, Dactylospora acarosporae, Lecanographa lyncea, Lecanora achariana, L. cenisia, Lichenostigma rugosa, Pertusaria velata, Phlyctis argena, Physconia petraea, Ramalina mollis, Rinodina occulta, Roccella arnoldii, R. fuciformis, "Stemphylium" botryosum. Another 56 species are new to Menorca.]
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Number of hits shown/total: 100/102.
Number of records in database: 41574.
Current date: 2024.09.13.OK