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https://www.readbyqxmd.com/read/29783117/changes-in-soil-nitrogen-dynamics-caused-by-prescribed-fires-in-dense-gorse-lands-in-sw-pyrenees
#1
Leire Múgica, Rosa M Canals, Leticia San Emeterio
Rural depopulation, abandonment of traditional land uses and decrease of extensive stockfarming is accelerating shrub encroachment in mountain areas. In NW Spain, gorse (Ulex gallii Planch.) is expanding, developing dense shrublands that accumulate high fuel-loads, ignite easily and persist during long periods as alternate stable states. Under this scenario, traditional bush-to-bush farming fires are being replaced by high fuel-load burnings performed by specialised teams to reduce fuels and promote mosaic landscapes...
May 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29782186/excessive-erythrocytosis-and-cardiovascular-risk-in-andean-highlanders
#2
Noemí Corante, Cecilia Anza-Ramírez, Rómulo Figueroa-Mujíca, José Luis Macarlupú, Gustavo Vizcardo-Galindo, Grzegorz Bilo, Gianfranco Parati, Jorge L Gamboa, Fabiola León-Velarde, Francisco C Villafuerte
Cardiovascular diseases are the main cause of death worldwide. Life under high-altitude (HA) hypoxic conditions is believed to provide highlanders with a natural protection against cardiovascular and metabolic diseases compared with sea-level inhabitants. However, some HA dwellers become intolerant to chronic hypoxia and develop a progressive incapacitating syndrome known as chronic mountain sickness (CMS), characterized by excessive erythrocytosis (EE; Hb ≥21 g/dL in men, Hb ≥19 g/dL in women). Evidence from HA studies suggests that, in addition to CMS typical signs and symptoms, these highlanders may also suffer from metabolic and cardiovascular disorders...
May 21, 2018: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29781219/disentangling-the-effects-of-acidic-air-pollution-atmospheric-co-2-and-climate-change-on-recent-growth-of-red-spruce-trees-in-the-central-appalachian-mountains
#3
Justin M Mathias, Richard B Thomas
In the 45 years after legislation of the Clean Air Act, there has been tremendous progress in reducing acidic air pollutants in the eastern United States, yet limited evidence exists that cleaner air has improved forest health. Here, we investigate the influence of recent environmental changes on the growth and physiology of red spruce (Picea rubens Sarg.) trees, a key indicator species of forest health, spanning three locations along a 100 km transect in the Central Appalachian Mountains. We incorporated a multiproxy approach using 75-year tree ring chronologies of basal tree growth, carbon isotope discrimination (∆13 C, a proxy for leaf gas exchange), and δ15 N (a proxy for ecosystem N status) to examine tree and ecosystem level responses to environmental change...
May 20, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29780668/impact-of-front-range-sources-on-reactive-nitrogen-concentrations-and-deposition-in-rocky-mountain-national-park
#4
Katherine B Benedict, Anthony J Prenni, Amy P Sullivan, Ashley R Evanoski-Cole, Emily V Fischer, Sara Callahan, Barkley C Sive, Yong Zhou, Bret A Schichtel, Jeffrey L Collett
Human influenced atmospheric reactive nitrogen (RN) is impacting ecosystems in Rocky Mountain National Park (ROMO). Due to ROMO's protected status as a Class 1 area, these changes are concerning, and improving our understanding of the contributions of different types of RN and their sources is important for reducing impacts in ROMO. In July-August 2014 the most comprehensive measurements (to date) of RN were made in ROMO during the Front Range Air Pollution and Photochemistry Éxperiment (FRAPPÉ). Measurements included peroxyacetyl nitrate (PAN), C1 -C5 alkyl nitrates, and high-time resolution NOx , NOy , and ammonia...
2018: PeerJ
https://www.readbyqxmd.com/read/29780173/land-use-in-mountain-grasslands-alters-drought-response-and-recovery-of-carbon-allocation-and-plant-microbial-interactions
#5
Stefan Karlowsky, Angela Augusti, Johannes Ingrisch, Roland Hasibeder, Markus Lange, Sandra Lavorel, Michael Bahn, Gerd Gleixner
Mountain grasslands have recently been exposed to substantial changes in land use and climate and in the near future will likely face an increased frequency of extreme droughts. To date, how the drought responses of carbon (C) allocation, a key process in the C cycle, are affected by land-use changes in mountain grassland is not known.We performed an experimental summer drought on an abandoned grassland and a traditionally managed hay meadow and traced the fate of recent assimilates through the plant-soil continuum...
May 2018: Journal of Ecology
https://www.readbyqxmd.com/read/29777687/physiological-stress-responses-in-wild-asian-elephants-elephas-maximus-in-a-human-dominated-landscape-in-the-western-ghats-southern-india
#6
Sreedhar Vijayakrishnan, Mavatur Ananda Kumar, G Umapathy, Vinod Kumar, Anindya Sinha
Increasing anthropogenic pressures on forests, especially in the tropical regions of the world, have restricted several large mammalian species such as the Asian elephant to fragmented habitats within human-dominated landscapes. In this study, we assessed the effects of an anthropogenic landscape and its associated conflict with humans on the physiological stress responses displayed by Asian elephants in the Anamalai Hills of the Western Ghats mountains in south India. We have quantified faecal glucocorticoid metabolite (FGM) concentrations in focal individual elephants within and across herds, inhabiting both anthropogenic and natural habitats, and evaluated their physiological responses to different socio-ecological situations between November 2013 and April 2014...
May 16, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29776461/thermal-structure-induced-biochemical-parameters-stratification-in-a-subtropical-dam-reservoir
#7
(no author information available yet)
Although stratification in deep lakes was well discussed, few studies pay attention to thermal structure as well as itsinfluences on stratification of biochemical parameters in subtropical lakes in mountainous cities. Here, we studied the depth profile of temperature and biochemical parameters in Longjing Lake,a subtropical reservoir in a mountainous city. The thermal stratification became strong during summer. Biochemical parameters were strongly associated with thermal structure. Stratification started at 2~6 m depth with substantial decrease of dissolved oxygen (DO), biochemical oxygen demand (BOD5), chlorophyll a (Chla) and pH, corresponding to increase of total nitrogen (TN), ammonium (NH4+), nitrite (NO2-), total inorganic nitrogen (TIN), total phosphorus (TP) and soluble reactive phosphorus (SRP) with depth, and the majority of biochemical parameters showed slight variations from 12 m downward...
May 18, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29775634/the-direction-of-protein-evolution-is-destined-by-the-stability
#8
Natsuko Ota, Ryo Kurahashi, Satoshi Sano, Kazufumi Takano
Protein evolution is potentially governed by protein stability. Here, we investigated the relationship between protein evolution and stability through the random mutational drift of a thermophilic bacterial protein, an esterase of Alicyclobacillus acidocaldarius (Aac-Est), at high and low temperatures. In the first random mutation of Aac-Est, few proteins exhibit increased activity at 65°C, indicating that the wild-type (WT) Aac-Est is located on the peak of a mountain in a fitness landscape for activity at high temperature...
May 15, 2018: Biochimie
https://www.readbyqxmd.com/read/29775458/species-turnover-drives-%C3%AE-diversity-patterns-across-multiple-spatial-scales-of-plant-galling-interactions-in-mountaintop-grasslands
#9
Marcel Serra Coelho, Marco Antônio Alves Carneiro, Cristina Alves Branco, Rafael Augusto Xavier Borges, Geraldo Wilson Fernandes
This study describes differences in species richness and composition of the assemblages of galling insects and their host plants at different spatial scales. Sampling was conducted along altitudinal gradients composed of campos rupestres and campos de altitude of two mountain complexes in southeastern Brazil: Espinhaço Range and Mantiqueira Range. The following hypotheses were tested: i) local and regional richness of host plants and galling insects are positively correlated; ii) beta diversity is the most important component of regional diversity of host plants and galling insects; and iii) Turnover is the main mechanism driving beta diversity of both host plants and galling insects...
2018: PloS One
https://www.readbyqxmd.com/read/29772724/concentrate-supplement-modifies-the-feeding-behavior-of-simmental-cows-grazing-in-two-high-mountain-pastures
#10
Alberto Romanzin, Mirco Corazzin, Edi Piasentier, Stefano Bovolenta
During grazing on Alpine pastures, the use of concentrates in dairy cows' diet leads to a reduction of the environmental sustainability of farms, and influences the selective pressure on some plant species. In order to minimize the use of concentrates, it is imperative to obtain data on the grazing behavior of cows. The aim of this study was to assess the effect of concentrate levels on the behavior of dairy cows during grazing. One hundred and ten lactating Italian Simmental cows, that sequentially grazed two pastures characterized by Poion alpinae (Poion) and Seslerion caeruleae (Seslerion) alliance, were considered...
May 16, 2018: Animals: An Open Access Journal From MDPI
https://www.readbyqxmd.com/read/29771344/prevalence-of-rickettsia-species-rickettsiales-rickettsiaceae-in-dermacentor-variabilis-ticks-acari-ixodidae-in-north-carolina
#11
Madhavi L Kakumanu, Loganathan Ponnusamy, Haley Sutton, Steven R Meshnick, William L Nicholson, Charles S Apperson
The American dog tick, Dermacentor variabilis (Say), is a vector of spotted fever group (SFG) rickettsiae, including Rickettsia rickettsii the causative organism of Rocky Mountain spotted fever (RMSF). In North Carolina, SFG rickettsioses (including RMSF) are a leading cause of tick-borne illness. Knowledge of the infection rate and geographic distribution of D. variabilis ticks infected with Rickettsia spp. provides information on the spatial distribution of public health risk. Accordingly, we extracted genomic DNA from adult D...
May 16, 2018: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29770273/westwards-and-northwards-dispersal-of-triosteum-himalayanum-caprifoliaceae-from-the-hengduan-mountains-region-based-on-chloroplast-dna-phylogeography
#12
Hai-Rui Liu, Qing-Bo Gao, Fa-Qi Zhang, Gulzar Khan, Shi-Long Chen
The varying topography and environment that resulted from paleoorogeny and climate fluctuations of the Himalaya-Hengduan Mountains (HHM) areas had a considerable impact on the evolution of biota during the Quaternary. To understand the phylogeographic pattern and historical dynamics of Triosteum himalayanum (Caprifoliaceae), we sequenced three chloroplast DNA fragments ( rbcL-accD , rps15-ycf1 , and trnH-psbA ) from 238 individuals representing 20 populations. Nineteen haplotypes (H1-H19) were identified based on 23 single-site mutations and eight indels...
2018: PeerJ
https://www.readbyqxmd.com/read/29769836/a-revision-of-the-cleptoparasitic-bee-genus-epeolus-latreille-for-nearctic-species-north-of-mexico-hymenoptera-apidae
#13
Thomas M Onuferko
Herein, the cleptoparasitic (cuckoo) bee genus Epeolus (Hymenoptera: Apidae) is revised for species occurring in North America, north of Mexico, and an updated checklist of all species known to occur in Canada and the United States of America is provided with comprehensive descriptions, diagnoses, and a single dichotomous key (using the same couplets for both sexes) to aid in their identification. To increase their recognition among North American naturalists, English common names are also proposed for all North American Epeolus ...
2018: ZooKeys
https://www.readbyqxmd.com/read/29769565/adaptation-to-criticality-through-organizational-invariance-in-embodied-agents
#14
Miguel Aguilera, Manuel G Bedia
Many biological and cognitive systems do not operate deep within one or other regime of activity. Instead, they are poised at critical points located at phase transitions in their parameter space. The pervasiveness of criticality suggests that there may be general principles inducing this behaviour, yet there is no well-founded theory for understanding how criticality is generated at a wide span of levels and contexts. In order to explore how criticality might emerge from general adaptive mechanisms, we propose a simple learning rule that maintains an internal organizational structure from a specific family of systems at criticality...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29768696/the-isohydric-trap-a-proposed-feedback-between-water-shortage-stomatal-regulation-and-nutrient-acquisition-drives-differential-growth-and-survival-of-european-pines-under-climatic-dryness
#15
D Salazar-Tortosa, J Castro, P Villar-Salvador, B Viñegla, L Matías, A Michelsen, R Rubio de Casas, J I Querejeta
Climatic dryness imposes limitations on vascular plant growth by reducing stomatal conductance, thereby decreasing CO2 uptake and transpiration. Given that transpiration-driven water flow is required for nutrient uptake, climatic stress-induced nutrient deficit could be a key mechanism for decreased plant performance under prolonged drought. We propose the existence of an "isohydric trap", a dryness-induced detrimental feedback leading to nutrient deficit and stoichiometry imbalance in strict isohydric species...
May 16, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29767828/a-digitally-facilitated-citizen-science-driven-approach-accelerates-participant-recruitment-and-increases-study-population-diversity
#16
Milo A Puhan, Nina Steinemann, Christian P Kamm, Stephanie Müller, Jens Kuhle, Roland Kurmann, Pasquale Calabrese, Jürg Kesselring, Viktor von Wyl, Swiss Multiple Sclerosis Registry Smsr
QUESTION UNDER STUDY: Our aim was to assess whether a novel approach of digitally facilitated, citizen-science research, as followed by the Swiss Multiple Sclerosis Registry (Swiss MS Registry), leads to accelerated participant recruitment and more diverse study populations compared with traditional research studies where participants are mostly recruited in study centres without the use of digital technology. METHODS: The Swiss MS Registry is a prospective, longitudinal, observational study covering all Switzerland...
May 16, 2018: Swiss Medical Weekly
https://www.readbyqxmd.com/read/29766427/an-improved-export-coefficient-model-to-estimate-non-point-source-phosphorus-pollution-risks-under-complex-precipitation-and-terrain-conditions
#17
Xian Cheng, Liding Chen, Ranhao Sun, Yongcai Jing
To control non-point source (NPS) pollution, it is important to estimate NPS pollution exports and identify sources of pollution. Precipitation and terrain have large impacts on the export and transport of NPS pollutants. We established an improved export coefficient model (IECM) to estimate the amount of agricultural and rural NPS total phosphorus (TP) exported from the Luanhe River Basin (LRB) in northern China. The TP concentrations of rivers from 35 selected catchments in the LRB were used to test the model's explanation capacity and accuracy...
May 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29764527/an-outbreak-of-haemorrhagic-fever-with-renal-syndrome-linked-with-mountain-recreational-activities-in-zagreb-croatia-2017
#18
Z Lovrić, B Kolarić, M L Kosanović Ličina, M Tomljenović, O Đaković Rode, K Danis, B Kaić, V Tešić
In 2017 Zagreb faced the largest outbreak of haemorrhagic fever with renal syndrome (HFRS) to date. We investigated to describe the extent of the outbreak and identify risk factors for infection. We compared laboratory-confirmed cases of Hantavirus infection in Zagreb residents with the onset of illness after 1 January 2017, with individually matched controls from the same household or neighbourhood. We calculated adjusted matched odds ratios (amOR) using conditional logistic regression. During 2017, 104 cases were reported: 11-81 years old (median 37) and 71% (73) male...
May 16, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29764385/a-qualitative-study-about-the-gendered-experiences-of-motherhood-and-perinatal-mortality-in-mountain-villages-of-nepal-implications-for-improving-perinatal-survival
#19
Mohan Paudel, Sara Javanparast, Gouranga Dasvarma, Lareen Newman
BACKGROUND: We aim to examine the gendered contexts of poor perinatal survival in the remote mountain villages of Nepal. The study setting comprised two remote mountain villages from a mid-western mountain district of Nepal that ranks lowest on the Human Development Index (0.304), and is reported as having the lowest child survival rates in the country. METHODS: The findings are taken from a larger study of perinatal survival in remote mountain villages of Nepal, conducted through a qualitative methodological approach within a framework of social constructionist and critical theoretical perspectives...
May 15, 2018: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/29763853/text-mining-and-network-analysis-to-find-functional-associations-of-genes-in-high-altitude-diseases
#20
Balu Bhasuran, Devika Subramanian, Jeyakumar Natarajan
BACKGROUND AND OBJECTIVES: Travel to elevations above 2500 m is associated with the risk of developing one or more forms of acute altitude illness such as acute mountain sickness (AMS), high altitude cerebral edema (HACE) or high altitude pulmonary edema (HAPE). Our work aims to identify the functional association of genes involved in high altitude diseases. METHOD: In this work we identified the gene networks responsible for high altitude diseases by using the principle of gene co-occurrence statistics from literature and network analysis...
May 2, 2018: Computational Biology and Chemistry
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