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https://www.readbyqxmd.com/read/28225773/whole-genome-duplication-and-molecular-evolution-in-cornus-l-cornaceae-insights-from-transcriptome-sequences
#1
Yan Yu, Qiuyun Xiang, Paul S Manos, Douglas E Soltis, Pamela S Soltis, Bao-Hua Song, Shifeng Cheng, Xin Liu, Gane Wong
The pattern and rate of genome evolution have profound consequences in organismal evolution. Whole-genome duplication (WGD), or polyploidy, has been recognized as an important evolutionary mechanism of plant diversification. However, in non-model plants the molecular signals of genome duplications have remained largely unexplored. High-throughput transcriptome data from next-generation sequencing have set the stage for novel investigations of genome evolution using new bioinformatic and methodological tools in a phylogenetic framework...
2017: PloS One
https://www.readbyqxmd.com/read/28224339/wastewater-treatment-and-public-health-in-nunavut-a-microbial-risk-assessment-framework-for-the-canadian-arctic
#2
Kiley Daley, Rob Jamieson, Daniel Rainham, Lisbeth Truelstrup Hansen
Wastewater management in Canadian Arctic communities is influenced by several geographical factors including climate, remoteness, population size, and local food-harvesting practices. Most communities use trucked collection services and basic treatment systems, which are capable of only low-level pathogen removal. These systems are typically reliant solely on natural environmental processes for treatment and make use of existing lagoons, wetlands, and bays. They are operated in a manner such that partially treated wastewater still containing potentially hazardous microorganisms is released into the terrestrial and aquatic environment at random times...
February 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28223481/sustained-disruption-of-narwhal-habitat-use-and-behavior-in-the-presence-of-arctic-killer-whales
#3
Greg A Breed, Cory J D Matthews, Marianne Marcoux, Jeff W Higdon, Bernard LeBlanc, Stephen D Petersen, Jack Orr, Natalie R Reinhart, Steven H Ferguson
Although predators influence behavior of prey, analyses of electronic tracking data in marine environments rarely consider how predators affect the behavior of tracked animals. We collected an unprecedented dataset by synchronously tracking predator (killer whales, [Formula: see text] = 1; representing a family group) and prey (narwhal, [Formula: see text] = 7) via satellite telemetry in Admiralty Inlet, a large fjord in the Eastern Canadian Arctic. Analyzing the movement data with a switching-state space model and a series of mixed effects models, we show that the presence of killer whales strongly alters the behavior and distribution of narwhal...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28222226/arctic-ground-squirrel-hippocampus-tolerates-oxygen-glucose-deprivation-independent-of-hibernation-season-even-when-not-hibernating-and-after-atp-depletion-acidosis-and-glutamate-efflux
#4
Saurav Bhowmick, Jeanette T Moore, Daniel L Kirschner, Kelly L Drew
Cerebral ischemia/reperfusion (I/R) triggers a cascade of uncontrolled cellular processes that perturb cell homeostasis. The arctic ground squirrel (AGS), a seasonal hibernator resists brain damage following cerebral I/R caused by cardiac arrest and resuscitation. However, it remains unclear if tolerance to I/R injury in AGS depends on the hibernation season. Moreover, it is also not clear if events such as depletion of ATP, acidosis and glutamate efflux that are associated with anoxic depolarization are attenuated in AGS...
February 21, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28215008/the-greater-snow-goose-anser-caerulescens-atlanticus-managing-an-overabundant-population
#5
Josée Lefebvre, Gilles Gauthier, Jean-François Giroux, Austin Reed, Eric T Reed, Luc Bélanger
Between the early 1900s and the 1990s, the greater snow goose Anser caerulescens atlanticus population grew from 3000 individuals to more than 700 000. Because of concerns about Arctic degradation of natural habitats through overgrazing, a working group recommended the stabilization of the population. Declared overabundant in 1998, special management actions were then implemented in Canada and the United States. Meanwhile, a cost-benefit socioeconomic analysis was performed to set a target population size. Discussions aiming towards attaining a common vision were undertaken with stakeholders at multiple levels...
March 2017: Ambio
https://www.readbyqxmd.com/read/28214119/persistent-organic-pollutants-in-the-olifants-river-basin-south-africa-bioaccumulation-and-trophic-transfer-through-a-subtropical-aquatic-food-web
#6
Vera Verhaert, Nadine Newmark, Wendy D'Hollander, Adrian Covaci, Wynand Vlok, Victor Wepener, Abraham Addo-Bediako, Antoinette Jooste, Johannes Teuchies, Ronny Blust, Lieven Bervoets
This study investigates the trophic transfer of persistent organic pollutants (POPs: PCBs, PBDEs, OCPs and PFASs) in the subtropical aquatic ecosystem of the Olifants River Basin (South Africa) by means of trophic magnification factors (TMFs). Relative trophic levels were determined by stable isotope analysis. POP levels in surface water, sediment and biota were low. Only ∑DDTs levels in fish muscle (<LOQ-61ng/g ww) were comparable or higher than values from other temperate and tropical regions. Significant positive relationships between relative trophic level and PCB, DDT and HCH concentrations were observed so trophic levels play an important role in the movement of contaminants through the food web...
February 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28214115/warm-summers-and-moderate-winter-precipitation-boost-rhododendron-ferrugineum-l-growth-in-the-taillefer-massif-french-alps
#7
L Francon, C Corona, E Roussel, J Lopez Saez, M Stoffel
Rhododendron ferrugineum L. is a widespread dwarf shrub species growing in high-elevation, alpine environments of the Western European Alps. For this reason, analysis of its growth rings offers unique opportunities to push current dendrochronological networks into extreme environments and way beyond the treeline. Given that different species of the same genus have been successfully used in tree-ring investigations, notably in the Himalayas where Rhododendron spp. has proven to be a reliable climate proxy, this study aims at (i) evaluating the dendroclimatological potential of R...
February 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28213541/accurate-quantification-of-laminarin-in-marine-organic-matter-with-enzymes-from-marine-microbes
#8
Stefan Becker, André Scheffel, Martin F Polz, Jan-Hendrik Hehemann
Marine algae produce varieties of glycans, which fulfill diverse biological functions and fuel the carbon and energy demand of heterotrophic microbes. A common approach to analyze marine organic matter uses acid to hydrolyze its glycans into measurable monosaccharides. These, however, may derive from different glycans that are built with the same monosaccharides, hence this approach does not distinguish between glycans in natural samples. Here we use enzymes to selectively digest and thereby quantify laminarin in particulate organic matter...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28210951/treatment-of-arctic-wastewater-by-chemical-coagulation-uv-and-peracetic-acid-disinfection
#9
Ravi Kumar Chhetri, Ewa Klupsch, Henrik Rasmus Andersen, Pernille Erland Jensen
Conventional wastewater treatment is challenging in the Arctic region due to the cold climate and scattered population. Thus, no wastewater treatment plant exists in Greenland, and raw wastewater is discharged directly to nearby waterbodies without treatment. We investigated the efficiency of physicochemical wastewater treatment, in Kangerlussuaq, Greenland. Raw wastewater from Kangerlussuaq was treated by chemical coagulation and UV disinfection. By applying 7.5 mg Al/L polyaluminium chloride (PAX XL100), 73% of turbidity and 28% phosphate was removed from raw wastewater...
February 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28208232/non-linear-co2-flux-response-to-seven-years-of-experimentally-induced-permafrost-thaw
#10
Marguerite Mauritz, Rosvel Bracho, Gerardo Celis, Jack Hutchings, Susan M Natali, Elaine Pegoraro, Verity G Salmon, Christina Schädel, Elizabeth E Webb, Edward A G Schuur
Rapid Arctic warming is expected to increase global greenhouse gas concentrations as permafrost thaw exposes immense stores of frozen carbon (C) to microbial decomposition. Permafrost thaw also stimulates plant growth, which could offset C loss. Using data from seven years of experimental Air and Soil warming in moist acidic tundra, we show that Soil warming had a much stronger effect on CO2 flux than Air warming. Soil warming caused rapid permafrost thaw and increased ecosystem respiration (Reco), gross primary productivity (GPP), and net summer CO2 storage (NEE)...
February 16, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28205612/dna-analysis-of-a-30-000-year-old-urocitellus-glacialis-from-northeastern-siberia-reveals-phylogenetic-relationships-between-ancient-and-present-day-arctic-ground-squirrels
#11
Marina Faerman, Gila Kahila Bar-Gal, Elisabetta Boaretto, Gennady G Boeskorov, Nikolai E Dokuchaev, Oleg A Ermakov, Fedor N Golenishchev, Stanislav V Gubin, Eugenia Mintz, Evgeniy Simonov, Vadim L Surin, Sergei V Titov, Oksana G Zanina, Nikolai A Formozov
In contrast to the abundant fossil record of arctic ground squirrels, Urocitellus parryii, from eastern Beringia, only a limited number of fossils is known from its western part. In 1946, unnamed GULAG prisoners discovered a nest with three mummified carcasses of arctic ground squirrels in the permafrost sediments of the El'ga river, Yakutia, Russia, that were later attributed to a new species, Citellus (Urocitellus) glacialis Vinogr. To verify this assignment and to explore phylogenetic relationships between ancient and present-day arctic ground squirrels, we performed (14)C dating and ancient DNA analyses of one of the El'ga mummies and four contemporaneous fossils from Duvanny Yar, northeastern Yakutia...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202811/small-birds-big-effects-the-little-auk-alle-alle-transforms-high-arctic-ecosystems
#12
Ivan González-Bergonzoni, Kasper L Johansen, Anders Mosbech, Frank Landkildehus, Erik Jeppesen, Thomas A Davidson
In some arctic areas, marine-derived nutrients (MDN) resulting from fish migrations fuel freshwater and terrestrial ecosystems, increasing primary production and biodiversity. Less is known, however, about the role of seabird-MDN in shaping ecosystems. Here, we examine how the most abundant seabird in the North Atlantic, the little auk (Alle alle), alters freshwater and terrestrial ecosystems around the North Water Polynya (NOW) in Greenland. We compare stable isotope ratios (δ(15)N and δ(13)C) of freshwater and terrestrial biota, terrestrial vegetation indices and physical-chemical properties, productivity and community structure of fresh waters in catchments with and without little auk colonies...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28202274/marine-debris-in-five-national-parks-in-alaska
#13
L Polasek, J Bering, H Kim, P Neitlich, B Pister, M Terwilliger, K Nicolato, C Turner, T Jones
Marine debris is a management issue with ecological and recreational impacts for agencies, especially on remote beaches not accessible by road. This project was implemented to remove and document marine debris from five coastal National Park Service units in Alaska. Approximately 80km of coastline were cleaned with over 10,000kg of debris collected. Marine debris was found at all 28 beaches surveyed. Hard plastics were found on every beach and foam was found at every beach except one. Rope/netting was the next most commonly found category, present at 23 beaches...
February 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28202225/persistent-organic-pollutants-and-diabetes-among-inuit-in-the-canadian-arctic
#14
Kavita Singh, Hing Man Chan
Type 2 diabetes is a chronic metabolic disease that is of increasing concern in Inuit communities. Behavioural factors such as physical inactivity and poor diet are well-known risk factors. Exposure to persistent organic pollutants (POPs) has emerged as an additional factor in the pathogenesis of diabetes. In this study, association between polychlorinated biphenyls (PCBs) and p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE) with diabetes in Canadian Inuit was examined. Data from the Adult Inuit Health Survey (2007-2008) of Inuit participants from the Canadian Arctic were analyzed...
February 12, 2017: Environment International
https://www.readbyqxmd.com/read/28201922/diagnosis-of-osteoporosis-in-rural-arctic-greenland-a-clinical-case-using-plain-chest-radiography-for-secondary-prevention-and-consideration-of-tools-for-primary-prevention-in-remote-areas
#15
Inuuteq Fleischer, Louise K Schæbel, Nadja Albertsen, Vibeke N Sørensen, Stig Andersen
CONTEXT: Osteoporosis is a frequent disease in many populations. The hallmark is fragility fractures, which are harbingers of future fractures, disability, mortality and cost on society. The occurrence increases with age, low vitamin D level and smoking. Smoking rates are high, vitamin D is low and life expectancy is rising steeply in Greenland, as is the need for focus on osteoporosis. We report a case that uses a simple and readily available tool to diagnose osteoporosis at the hospital in Sisimiut, a town of 5000 inhabitants on the west coast of Greenland...
January 2017: Rural and Remote Health
https://www.readbyqxmd.com/read/28194307/vascular-plant-biodiversity-of-the-lower-coppermine-river-valley-and-vicinity-nunavut-canada-an-annotated-checklist-of-an-arctic-flora
#16
Jeffery M Saarela, Paul C Sokoloff, Roger D Bull
The Coppermine River in western Nunavut is one of Canada's great Arctic rivers, yet its vascular plant flora is poorly known. Here, we report the results of a floristic inventory of the lower Coppermine River valley and vicinity, including Kugluk (Bloody Falls) Territorial Park and the hamlet of Kugluktuk. The study area is approximately 1,200 km(2), extending from the forest-tundra south of the treeline to the Arctic coast. Vascular plant floristic data are based on a review of all previous collections from the area and more than 1,200 new collections made in 2014...
2017: PeerJ
https://www.readbyqxmd.com/read/28193867/genetic-signature-of-natural-selection-in-first-americans
#17
Carlos Eduardo G Amorim, Kelly Nunes, Diogo Meyer, David Comas, Maria Cátira Bortolini, Francisco Mauro Salzano, Tábita Hünemeier
When humans moved from Asia toward the Americas over 18,000 y ago and eventually peopled the New World they encountered a new environment with extreme climate conditions and distinct dietary resources. These environmental and dietary pressures may have led to instances of genetic adaptation with the potential to influence the phenotypic variation in extant Native American populations. An example of such an event is the evolution of the fatty acid desaturases (FADS) genes, which have been claimed to harbor signals of positive selection in Inuit populations due to adaptation to the cold Greenland Arctic climate and to a protein-rich diet...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28193478/metabolic-cold-adaptation-contributes-little-to-the-interspecific-variation-in-metabolic-rates-of-65-species-of-drosophilidae
#18
Branwen Messamah, Vanessa Kellermann, Hans Malte, Volker Loeschcke, Johannes Overgaard
Metabolic cold adaptation (MCA) is a controversial hypothesis suggesting that cold adapted species display an elevated metabolic rate (MR) compared to their warm climate relatives. Here we test for the presence of MCA within 65 species of drosophilid flies reared under common garden conditions. MR was measured at both 10 and 20°C for both sexes and data was analyzed in relation to the natural thermal environment of these species. We found considerable interspecific variation in MR ranging from 1.34 to 8.99 µW mg(-1) at 10°C...
February 10, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28188780/structural-insights-into-the-cold-adaptation-of-the-photosynthetic-pigment-protein-c-phycocyanin-from-an-arctic-cyanobacterium
#19
Hai-Nan Su, Qian-Min Wang, Chun-Yang Li, Kang Li, Wei Luo, Bo Chen, Xi-Ying Zhang, Qi-Long Qin, Bai-Cheng Zhou, Xiu-Lan Chen, Yu-Zhong Zhang, Bin-Bin Xie
The cold adaptation mechanism of phycobiliproteins, the major photosynthetic pigment-proteins in cyanobacteria and red algae, has rarely been studied. Here we reported the biochemical, structural, and molecular dynamics simulation study of the C-phycocyanin from Arctic cyanobacterial strain Pseudanabaena sp. LW0831. We characterized the phycobilisome components of LW0831 and obtained their gene sequences. Compared to the mesophilic counterpart from Arthrospira platensis (Ar-C-PC), LW0831 C-phycocyanin (Ps-C-PC) has a decreased thermostability (∆Tm of -16°C), one of the typical features of cold-adapted enzymes...
February 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28188150/multisite-musculoskeletal-pain-in-adolescence-and-later-mental-health-disorders-a-population-based-registry-study-of-norwegian-youth-the-naahs-cohort-study
#20
Christian Eckhoff, Bjørn Straume, Siv Kvernmo
OBJECTIVES: To examine the association between multisite musculoskeletal pain in adolescence and mental health disorders in young adulthood. DESIGN AND SETTING: Data were obtained from a linkage between the Norwegian Patient Registry (2008-2012) and the Norwegian Arctic Adolescent Health Study, a school-based survey conducted among 10th grade students in North Norway (2003-2005). PARTICIPANTS: In total, 3987 (68%) of all 5877 invited participants consented to the registry linkage...
February 10, 2017: BMJ Open
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