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https://www.readbyqxmd.com/read/28926642/a-late-holocene-pollen-record-from-proglacial-oblong-tarn-mount-kenya
#1
Colin J Courtney Mustaphi, Konrad Gajewski, Rob Marchant, Gunhild Rosqvist
High-elevation ecosystems, such as those on Mount Kenya are undergoing significant changes, with accelerated glacial ice losses over the twentieth century creating new space for alpine plants to establish. These ecosystems respond rapidly to climatic variability and within decades of glacial retreat, Afroalpine pioneering taxa stabilize barren land and facilitate soil development, promoting complex patches of alpine vegetation. Periglacial lake sediment records can be used to examine centennial and millennial scale variations in alpine and montane vegetation compositions...
2017: PloS One
https://www.readbyqxmd.com/read/28925251/understanding-and-predicting-the-fate-of-semi-volatile-organic-pesticides-in-a-glacier-fed-lake-using-a-multimedia-chemical-fate-model
#2
Xiaolin Wu, Cleo Lisa Davie-Martin, Christine Steinlin, Kimberly J Hageman, Nicolas J Cullen, Christian Bogdal
Melting glaciers release previously ice-entrapped chemicals to the surrounding environment. As glacier melting accelerates under future climate warming, chemical release may also increase. This study investigated the behavior of semi-volatile pesticides over the course of one year and predicted their behavior under two future climate change scenarios. Pesticides were quantified in air, lake water, glacial melt water, and stream water in the catchment of Lake Brewster, an alpine glacier-fed lake located in the Southern Alps of New Zealand...
September 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28918079/clogging-of-an-alpine-streambed-by-silt-sized-particles-insights-from-laboratory-and-field-experiments
#3
Jasmin Fetzer, Markus Holzner, Michael Plötze, Gerhard Furrer
Clogging of streambeds by suspended particles (SP) can cause environmental problems, as it can negatively influence, e.g., habitats for macrozoobenthos, fish reproduction and groundwater recharge. This especially applies in the case of silt-sized SP. Until now, most research has dealt with coarse SP and was carried out in laboratory systems. The aims of this study are to examine (1) whether physical clogging by silt-sized SP exhibits the same dynamics and patterns as by sand-sized SP, and (2) the comparability of results between laboratory and field experiments...
September 7, 2017: Water Research
https://www.readbyqxmd.com/read/28917407/corneal-topography-and-keratometry-changes-after-glued-intraocular-lens-implantation
#4
Dhivya Ashok Kumar, Harspreet Kaur, Amar Agarwal, Sajitha Selvaraj, Sathish Kumar Pandian, Vamsi Chintalpati
PURPOSE: To analyze the alterations in corneal topography and keratometry (K) after glued transscleral-fixated intraocular lens (IOL) implantation. SETTING: Dr. Agarwal's Eye Hospital, Chennai, India. DESIGN: Prospective case series. METHODS: Eyes having glued IOL implantation for aphakia or subluxated lens (>180 degrees) were included. Preoperative autorefractometer and corneal topography was performed. Intraoperative parameters, namely the type, position, and incision size, flap position, and number of sutures were noted...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28917172/reconstruction-of-atmospheric-trace-metals-pollution-in-southwest-china-using-sediments-from-a-large-and-deep-alpine-lake-historical-trends-sources-and-sediment-focusing
#5
Qi Lin, Enfeng Liu, Enlou Zhang, Bibhash Nath, Ji Shen, Hezhong Yuan, Rong Wang
Atmospheric pollution, one of the leading environmental problems in South and East Asia, and its impact on the terrestrial environmental quality remain poorly understood particularly in alpine areas where both historical and present-day mining and smelting operations might leave an imprint. Here, we reconstructed atmospheric trace metals pollution during the past century using core sediments from a large and deep alpine lake in Southwest China. The implication of in lake and/or in watershed sediment focusing in pollution quantification is discussed by analyzing 15 sediment cores...
September 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28916706/the-expression-of-ldh-c-in-the-skeletal-muscle-of-plateau-pika-ochotona-curzoniae-enhances-adaptation-to-a-hypoxic-environment
#6
Zhi F An, Deng B Wei, Lian Wei, Yang Wang, Lin N Wei
The plateau pika (Ochotona curzoniae) is a species of sprint-running alpine animals in the Qinghai-Tibet Plateau, which is a harsh highland hypoxic environment. Ldh-c is expressed in the testis, sperm and somatic tissues of plateau pika. To reveal the role and physiological mechanisms of sperm-specific lactate dehydrogenase (LDH-C4), in plateau pika to adapt to hypoxic environment, an adenoviral line of pMultiRNAi-Ldhc was constructed and injected into the bilateral biceps femoris of the hind legs. The swimming times of the pikas, and the Ldh-c expression levels, total LDH activities and ATP levels in skeletal muscle, were measured after the pikas were raised in the trapped site for 5 days...
September 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28912731/long-term-athletic-development-in-youth-alpine-ski-racing-the-effect-of-physical-fitness-ski-racing-technique-anthropometrics-and-biological-maturity-status-on-injuries
#7
Lisa Müller, Carolin Hildebrandt, Erich Müller, Christian Fink, Christian Raschner
Alpine ski racing is known to be a sport with a high risk of injuries. Because most studies have focused mainly on top-level athletes and on traumatic injuries, limited research exists about injury risk factors among youth ski racers. The aim of this study was to determine the intrinsic risk factors (anthropometrics, biological maturity, physical fitness, racing technique) for injury among youth alpine ski racers. Study participants were 81 youth ski racers attending a ski boarding school (50 males, 31 females; 9-14 years)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28912063/differential-expression-by-chromatin-modifications-of-alcohol-dehydrogenase-1-of-chorispora-bungeana-in-cold-stress
#8
Lijun Liu, Yuan Song, Jun Xu, Dongming Li, Gaopeng Li, Lizhe An
Epigenetic modifications regulate plant genes to cope with a variety of environmental stresses. Chorispora bungeana is an alpine subnival plant with strong tolerance to multiple abiotic stresses, especially cold stress. In this study, we characterized the alcohol dehydrogenase 1 gene from Chorispora bungeana, CbADH1, that is up-regulated in cold conditions. Overexpression of CbADH1 in Arabidopsis thaliana improved cold tolerance, as indicated by a decreased lethal temperature (LT50). Chromatin immunoprecipitation assays showed that histone H3 is removed from the promoter region and the middle-coding region of the gene...
September 11, 2017: Gene
https://www.readbyqxmd.com/read/28904775/how-shrub-encroachment-under-climate-change-could-threaten-pollination-services-for-alpine-wildflowers-a-case-study-using-the-alpine-skypilot-polemonium-viscosum
#9
Jessica A Kettenbach, Nicole Miller-Struttmann, Zoë Moffett, Candace Galen
Under climate change, shrubs encroaching into high altitude plant communities disrupt ecosystem processes. Yet effects of encroachment on pollination mutualisms are poorly understood. Here, we probe potential fitness impacts of interference from encroaching Salix (willows) on pollination quality of the alpine skypilot, Polemonium viscosum. Overlap in flowering time of Salix and Polemonium is a precondition for interference and was surveyed in four extant and 25 historic contact zones. Pollinator sharing was ascertained from observations of willow pollen on bumble bees visiting Polemonium flowers and on Polemonium pistils...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28904178/offspring-telomere-length-in-the-long-lived-alpine-swift-is-negatively-related-to-the-age-of-their-biological-father-and-foster-mother
#10
François Criscuolo, Sandrine Zahn, Pierre Bize
A growing body of studies is showing that offspring telomere length (TL) can be influenced by the age of their parents. Such a relationship might be explained by variation in TL at conception (gamete effect) and/or by alteration of early growth conditions in species providing parental care. In a long-lived bird with bi-parental care, the Alpine swift (Apus melba), we exchanged an uneven number of 2 to 4-day-old nestlings between pairs as part of a brood size manipulation. Nestling TL was measured at 50 days after hatching, which allowed investigation of the influence of the age of both their biological and foster parents on offspring TL, after controlling for the manipulation...
September 2017: Biology Letters
https://www.readbyqxmd.com/read/28901201/sex-differences-in-balance-among-alpine-ski-racers-cross-sectional-age-comparisons
#11
Christian Raschner, Carolin Hildebrandt, Johanna Mohr, Lisa Müller
Although balance is a key ability in the strength demands of alpine ski racing, affecting both performance and injury prevention, few studies have examined balance or related sex differences among still-maturing athletes. In this 10-year study, we investigated cross-sectional balance performances at different age periods of a representative sample of over 500 11-18-year-old elite skiers of both genders. Participants performed balance tests using the MFT S3-Check. Left-right and forward-backward movements were used to calculate sensory and symmetry balance scores, which were both incorporated into a stability score...
January 1, 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/28900434/contrasting-effects-of-extreme-drought-and-snowmelt-patterns-on-mountain-plants-along-an-elevation-gradient
#12
Sergey Rosbakh, Annette Leingärtner, Bernhard Hoiss, Jochen Krauss, Ingolf Steffan-Dewenter, Peter Poschlod
Despite the evidence that increased frequency and magnitude of extreme climate events (ECE) considerably affect plant performance, there is still a lack of knowledge about how these events affect mountain plant biodiversity and mountain ecosystem functioning. Here, we assessed the short-term (one vegetation period) effects of simulated ECEs [extreme drought (DR), advanced and delayed snowmelt (AD and DE), respectively] on the performance of 42 plant species occurring in the Bavarian Alps (Germany) along an elevational gradient of 600-2000 m a...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28898932/effects-of-thermopeaking-on-the-thermal-response-of-alpine-river-systems-to-heatwaves
#13
Meili Feng, Guido Zolezzi, Martin Pusch
Within the past 30years there have been two major heatwave events (in 2003 and 2006) that broke 500-year-old temperature records in Europe. Owing to the growing concern of rising temperatures, we analyzed the potential response in a number of river sections that are subject to hydropeaking and thermopeaking through the intermittent release of water from hydropower stations. Thermopeaking in alpine streams is known to intermittently cool down the river water in summer and to warm it up in winter. We analyzed the response of river water temperature to air temperature during heatwaves at 19 gauging stations across Switzerland, using a 30-yr dataset at a 10-min resolution...
September 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28898582/spatio-temporal-distribution-and-alpine-behavior-of-short-chain-chlorinated-paraffins-in-air-at-shergyla-mountain-and-lhasa-on-the-tibetan-plateau-of-china
#14
Jing Wu, Wei Gao, Yong Liang, Jianjie Fu, Yan Gao, Yawei Wang, Guibin Jiang
Pristine high-altitude mountains are ideal areas for studying the potential mechanism behind the long-range transport and environmental behavior of persistent organic pollutants (POPs) in remote areas. Short chain chlorinated paraffins (SCCPs) are the most complex halogenated contaminants in the environment, and have attracted extensive worldwide interest in recent years. In this study, the spatio-temporal concentrations and distributions of SCCPs in air collected from Shergyla Mountain (located in the southeast of the Tibetan Plateau) and Lhasa were investigated during 2012-2015...
September 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28889327/a-linkage-between-flowering-phenology-and-fruit-set-success-of-alpine-plant-communities-with-reference-to-the-seasonality-and-pollination-effectiveness-of-bees-and-flies
#15
Yuki Mizunaga, Gaku Kudo
To clarify the linkage between flowering phenology and pollination success in alpine plant communities, we quantified the seasonality of flower visitors, the temporal transition of floral resources, and the variation in pollination success of alpine plants in northern Japan. Bumble bees, syrphid flies, and non-syrphid flies were the predominant flower visitors. Foraging activity of bumble bees increased toward the late flowering period reflecting the life cycle of colony development. The activity of syrphid flies was sensitive to ambient temperature, while that of non-syrphid flies remained high throughout the season...
September 9, 2017: Oecologia
https://www.readbyqxmd.com/read/28882153/susceptibility-of-moroccan-sheep-and-goat-breeds-to-peste-des-petits-ruminants-virus
#16
Fatima Zohra Fakri, Asmaa Elhajjam, Zahra Bamouh, Mohammed Jazouli, Zineb Boumart, Khalid Tadlaoui, Ouafaa Fassi-Fihri, Mehdi Elharrak
BACKGROUND: Peste des petits ruminants (PPR) is a highly contagious viral disease of small ruminants in Asia and Africa. In 2008, a PPR outbreak was reported for the first time in Morocco and a mass vaccination campaign allowed control of the disease. In this study, the susceptibility of four Moroccan local breeds of small ruminants to PPR virus was investigated by experimental infections. The objective was to make recommendations for improved epidemiological surveillance in Morocco by evaluating the susceptibility of the dominant Moroccan small ruminant breeds...
September 7, 2017: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/28878807/distribution-and-functionality-of-copy-number-variation-across-european-cattle-populations
#17
Maulik Upadhyay, Vinicus H da Silva, Hendrik-Jan Megens, Marleen H P W Visker, Paolo Ajmone-Marsan, Valentin A Bâlteanu, Susana Dunner, Jose F Garcia, Catarina Ginja, Juha Kantanen, Martien A M Groenen, Richard P M A Crooijmans
Copy number variation (CNV), which is characterized by large-scale losses or gains of DNA fragments, contributes significantly to genetic and phenotypic variation. Assessing CNV across different European cattle populations might reveal genetic changes responsible for phenotypic differences, which have accumulated throughout the domestication history of cattle as consequences of evolutionary forces that act upon them. To explore pattern of CNVs across European cattle, we genotyped 149 individuals, that represent different European regions, using the Illumina Bovine HD Genotyping array...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28878792/uv-screening-in-native-and-non-native-plant-species-in-the-tropical-alpine-implications-for-climate-change-driven-migration-of-species-to-higher-elevations
#18
Paul W Barnes, Ronald J Ryel, Stephan D Flint
Ongoing changes in Earth's climate are shifting the elevation ranges of many plant species with non-native species often experiencing greater expansion into higher elevations than native species. These climate change-induced shifts in distributions inevitably expose plants to novel biotic and abiotic environments, including altered solar ultraviolet (UV)-B (280-315 nm) radiation regimes. Do the greater migration potentials of non-native species into higher elevations imply that they have more effective UV-protective mechanisms than native species? In this study, we surveyed leaf epidermal UV-A transmittance (TUV A) in a diversity of plant species representing different growth forms to test whether native and non-native species growing above 2800 m elevation on Mauna Kea, Hawaii differed in their UV screening capabilities...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28875232/spatiotemporal-variations-of-the-start-of-thermal-growing-season-for-grassland-on-the-qinghai-tibetan-plateau-during-1961-2014
#19
Wenquan Zhu, Donghai Zhang, Nan Jiang, Zhoutao Zheng
The start of thermal growing season (STGS) is an important indicator for climate change effects on regional plant growth and development. This study comprehensively investigated and compared the spatiotemporal variations in STGS at 0 °C (STGS_0), 5 °C (STGS_5), and 10 °C (STGS_10) thresholds for grassland on the Qinghai-Tibetan Plateau (QTP) during 1961-2014. Although elevation was the predominant influencing factor of the spatial variations of STGSs, the effect of latitude should not be ignored at the low-elevation regions, especially for the STGS with a low-temperature threshold (e...
September 5, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28861248/growth-form-evolution-and-hybridization-in-senecio-asteraceae-from-the-high-equatorial-andes
#20
Eva Dušková, Petr Sklenář, Filip Kolář, Diana L A Vásquez, Katya Romoleroux, Tomáš Fér, Karol Marhold
Changes in growth forms frequently accompany plant adaptive radiations, including páramo-a high-elevation treeless habitat type of the northern Andes. We tested whether diverse group of Senecio inhabiting montane forests and páramo represented such growth form changes. We also investigated the role of Andean geography and environment in structuring genetic variation of this group. We sampled 108 populations and 28 species of Senecio (focusing on species from former genera Lasiocephalus and Culcitium) and analyzed their genetic relationships and patterns of intraspecific variation using DNA fingerprinting (AFLPs) and nuclear DNA sequences (ITS)...
August 2017: Ecology and Evolution
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