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https://www.readbyqxmd.com/read/28165444/correlation-between-cervical-infection-and-preterm-labor
#1
Larisa Mešić Ðogić, Nenad Lučić, Dragana Mićić, Feđa Omeragić, Enes Hodžić, Seid Fazlagić, Refka Kovač, Nevenka Pavlović
Aim To investigate a correlation between cervical canal infection and imminent preterm labor and to identify most frequent pathogens. Methods A prospective study was conducted in obstetrics/gynecology departments of Health Center and the University Clinical Center Tuzla, and General Hospital Tešanj (Bosnia and Herzegovina, B&H) between October 2013 and May 2014. An examined group included 50 healthy pregnant women with singleton pregnancy of the gestation age between the 28th and 37th week, with cervical changes that are related to imminent preterm labor...
February 1, 2017: Medicinski Glasnik
https://www.readbyqxmd.com/read/28154965/an-assessment-of-diurnal-water-uptake-in-a-mesic-prairie-evidence-for-hydraulic-lift
#2
Kimberly O'Keefe, Jesse B Nippert
Hydraulic lift, the passive movement of water through plant roots from wet to dry soil, is an important ecohydrological process in a wide range of water-limited ecosystems. This phenomenon may also alter plant functioning, growth, and survival in mesic grasslands, where soil moisture is spatially and temporally variable. Here, we monitored diurnal changes in the isotopic signature of soil and plant xylem water to assess (1) whether hydraulic lift occurs in woody and herbaceous tallgrass prairie species (Rhus glabra, Amorpha canescens, Vernonia baldwinii, and Andropogon gerardii), (2) if nocturnal transpiration or grazing by large ungulates limits hydraulic lift, and (3) if a dominant grass, A...
February 2, 2017: Oecologia
https://www.readbyqxmd.com/read/28152187/clinal-population-divergence-in-an-adaptive-parental-environmental-effect-that-adjusts-seed-banking
#3
Christian Lampei, Johannes Metz, Katja Tielbörger
Bet-hedging via between-year seed dormancy is a costly strategy for plants in unpredictable environments. Theoretically, fitness costs can be reduced through a parental environmental effect when the environment is partly predictable. We tested whether populations from environments that differ in predictability diverged in parental effects on seed dormancy. Common garden-produced seeds of the two annual plant species Biscutella didyma and Bromus fasciculatus collected along an aridity gradient were grown under 12 irrigation treatments...
February 2, 2017: New Phytologist
https://www.readbyqxmd.com/read/28126515/post-eocene-climate-change-across-continental-australia-and-the-diversification-of-australasian-spiny-trapdoor-spiders-idiopidae-arbanitinae
#4
Michael G Rix, Steven J B Cooper, Karen Meusemann, Seraina Klopfstein, Sophie E Harrison, Mark S Harvey, Andrew D Austin
The formation and spread of the Australian arid zone during the Neogene was a profoundly transformative event in the biogeographic history of Australia, resulting in extinction or range contraction in lineages adapted to mesic habitats, as well as diversification and range expansion in arid-adapted taxa (most of which evolved from mesic ancestors). However, the geographic origins of the arid zone biota are still relatively poorly understood, especially among highly diverse invertebrate lineages, many of which are themselves poorly documented at the species level...
January 23, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28123112/how-the-aridification-of-australia-structured-the-biogeography-and-influenced-the-diversification-of-a-large-lineage-of-australian-cicadas
#5
Christopher L Owen, David C Marshall, Kathy B R Hill, Chris Simon
Over the last 30 million years, Australia's landscape has undergone dramatic cooling and drying due to the establishment of the Antarctic Circumpolar Current and change in global CO[Formula: see text] levels. Studies have shown that many Australian organisms went extinct during these major cooling events, while others experienced adaptive radiations and increases in diversification rates as a result of exploiting new niches in the arid zone. Despite the many studies on diversification and biogeography in Australia, few have been continent-wide and none have focused on a group of organisms adapted to feeding on plants...
January 25, 2017: Systematic Biology
https://www.readbyqxmd.com/read/28107055/radiating-despite-a-lack-of-character-ecological-divergence-among-closely-related-morphologically-similar-honeyeaters-aves-meliphagidae-co-occurring-in-arid-australian-environments
#6
Eliot T Miller, Sarah K Wagner, Luke J Harmon, Robert E Ricklefs
Quantifying the relationship between form and function can inform use of morphology as a surrogate for ecology. How the strength of this relationship varies continentally can inform understanding of evolutionary radiations; for example, does the relationship break down when certain lineages invade and diversify in novel habitats? The 75 species of Australian honeyeaters (Meliphagidae) are morphologically and ecologically diverse, with species feeding on nectar, insects, fruit, and other resources. We investigated Meliphagidae ecomorphology and community structure by (1) quantifying the concordance between morphology and ecology (foraging behavior), (2) estimating rates of trait evolution in relation to the packing of ecological space, and (3) comparing phylogenetic and trait community structure across the broad environmental gradients of the continent...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28097736/restoration-and-management-for-plant-diversity-enhances-the-rate-of-belowground-ecosystem-recovery
#7
Ryan P Klopf, Sara G Baer, Elizabeth M Bach, J Six
The positive relationship between plant diversity and ecosystem functioning has been criticized for its applicability at large scales and in less controlled environments that are relevant to land management. To inform this gap between ecological theory and application, we compared recovery rates of belowground properties using two chronosequences consisting of continuously cultivated and independently restored fields with contrasting diversity management strategies: grasslands restored with high plant richness and managed for diversity with frequent burning (n=20) and grasslands restored with fewer species that were infrequently burned (n=15)...
January 17, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28094046/spatiotemporal-variation-of-arbuscular-mycorrhizal-fungal-colonization-in-olive-olea-europaea-l-roots-across-a-broad-mesic-xeric-climatic-gradient-in-north-africa
#8
Amel Meddad-Hamza, Nabila Hamza, Souad Neffar, Arifa Beddiar, Silvio Gianinazzi, Haroun Chenchouni
This study aims to determine the spatiotemporal dynamics of root colonization and spore density of arbuscular mycorrhizal fungi (AMF) in the rhizosphere of olive trees (Olea europaea) with different plantation ages and under different climatic areas in Algeria. Soil and root samples were seasonally collected from three olive plantations of different ages. Other samples were carried out in productive olive orchards cultivated under a climatic gradient (desertic, semi-arid, subhumid, and humid). The olive varieties analysed in this study were Blanquette, Rougette, Chemlel and the wild-olive...
January 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28065919/force-of-habit-shrubs-trees-and-contingent-evolution-of-wood-anatomical-diversity-using-croton-euphorbiaceae-as-a-model-system
#9
Rafael Arévalo, Benjamin W van Ee, Ricarda Riina, Paul E Berry, Alex C Wiedenhoeft
BACKGROUND AND AIMS: Wood is a major innovation of land plants, and is usually a central component of the body plan for two major plant habits: shrubs and trees. Wood anatomical syndromes vary between shrubs and trees, but no prior work has explicitly evaluated the contingent evolution of wood anatomical diversity in the context of these plant habits. METHODS: Phylogenetic comparative methods were used to test for contingent evolution of habit, habitat and wood anatomy in the mega-diverse genus Croton (Euphorbiaceae), across the largest and most complete molecular phylogeny of the genus to date...
January 8, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28040775/genomic-signatures-of-historical-allopatry-and-ecological-divergence-in-an-island-lizard
#10
Richard P Brown, Steve Paterson, Judith Risse
Geographical variation among contiguous populations is frequently attributed to ecological divergence or historical isolation followed by secondary contact. Distinguishing between these effects is key to studies of incipient speciation and could be revealed by different genomic signatures. We used RAD-seq analyses to examine morphologically divergent populations of the endemic lizard (Gallotia galloti) from the volcanic island of Tenerife. Previous analyses have suggested ecological and historical causes to explain the morphological diversity...
December 31, 2016: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28029193/disturbance-and-productivity-interactions-mediate-stability-of-forest-composition-and-structure
#11
Christopher D O'Connor, Donald A Falk, Ann M Lynch, Thomas W Swetnam, Craig P Wilcox
Fire is returning to many conifer dominated forests where species composition and structure have been altered by fire exclusion. Ecological effects of these fires are influenced strongly by the degree of forest change during the fire-free period. Response of fire-adapted species assemblages to extended fire-free intervals is highly variable, even in communities with similar historical fire regimes. This variability in plant community response to fire exclusion is not well understood; however, ecological mechanisms such as individual species' adaptations to disturbance or competition, and underlying site characteristics that facilitate or impede establishment and growth have been proposed as potential drivers of assemblage response...
December 28, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28001335/climate-change-and-the-eco-hydrology-of-fire-will-area-burned-increase-in-a-warming-western-usa
#12
Donald McKenzie, Jeremy S Littell
Wildfire area is predicted to increase with global warming. Empirical statistical models and process-based simulations agree almost universally. The key relationship for this unanimity, observed at multiple spatial and temporal scales, is between drought and fire. Predictive models often focus on ecosystems in which this relationship appears to be particularly strong, such as mesic and arid forests and shrublands with substantial biomass such as chaparral. We examine the drought-fire relationship, specifically the correlations between water-balance deficit and annual area burned, across the full gradient of deficit in the western USA, from temperate rainforest to desert...
August 25, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27984632/local-epiphyte-establishment-and-future-metapopulation-dynamics-in-landscapes-with-different-spatiotemporal-properties
#13
Rocío Belinchón, Philip J Harrison, Louise Mair, Gergely Várkonyi, Tord Snäll
Understanding the relative importance of different ecological processes on the metapopulation dynamics of species is the basis for accurately forecasting metapopulation size in fragmented landscapes. Successful local colonization depends on both species dispersal range and how local habitat conditions affect establishment success. Moreover, there is limited understanding of the effects of different spatiotemporal landscape properties on future metapopulation size. We investigate which factors drive the future metapopulation size of the epiphytic model lichen species Lobaria pulmonaria in a managed forest landscape...
December 16, 2016: Ecology
https://www.readbyqxmd.com/read/27917183/responses-of-soil-microbial-biomass-and-enzyme-activities-to-tillage-and-fertilization-systems-in-soybean-glycine-max-l-production
#14
Gholamreza Heidari, Khosro Mohammadi, Yousef Sohrabi
Tillage operation and fertilizer type play important roles in soil properties as far as soil microbial condition is concerned. Information regarding the simultaneous evaluation of the effect of long-term tillage and fertilization on the soil microbial traits of soybean farms is not available. Accordingly, it was hypothesized that, the microbial biomass and enzyme activity, more often than not, respond quickly to changes in soil tillage and fertilization. Therefore, the experiments were aimed at analyzing the responses of soil microbial traits to tillage and fertilization in a soybean field in Kurdistan University, Iran...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27907259/spectral-diversity-area-relationships-for-assessing-biodiversity-in-a%C3%A2-wildland-agriculture-matrix
#15
Kyla Marie Dahlin
Species-area relationships have long been used to assess patterns of species diversity across scales. Here, this concept is extended to spectral diversity using hyperspectral data collected by NASA's Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) over western Michigan. This mixture of mesic forest and agricultural lands offers two end-points on the local-scale diversity continuum; one set of well-mixed forest patches and one set of highly homogeneous agricultural patches. Using the sum of the first three principal component values and the principal components' convex hull volume, spectral diversity was compared within and among these plots and to null expectations for perfectly random and perfectly patchy landscapes...
December 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27906022/risk-factors-for-unstructured-treatment-interruptions-and-association-with-survival-in-low-to-middle-income-countries
#16
James H McMahon, Tim Spelman, Nathan Ford, Jane Greig, Anita Mesic, Charles Ssonko, Esther C Casas, Daniel P O'Brien
BACKGROUND: Antiretroviral therapy (ART) treatment interruptions lead to poor clinical outcomes with unplanned or unstructured TIs (uTIs) likely to be underreported. This study describes; uTIs, their risk factors and association with survival. METHODS: Analysis of ART programmatic data from 11 countries across Asia and Africa between 2003 and 2013 where an uTI was defined as a ≥90-day patient initiated break from ART calculated from the last day the previous ART prescription would have run out until the date of the next ART prescription...
July 11, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27886506/measurement-of-excitation-spectra-in-the-12-c-p-d-reaction-near-the-%C3%AE-emission-threshold
#17
Y K Tanaka, K Itahashi, H Fujioka, Y Ayyad, J Benlliure, K-T Brinkmann, S Friedrich, H Geissel, J Gellanki, C Guo, E Gutz, E Haettner, M N Harakeh, R S Hayano, Y Higashi, S Hirenzaki, C Hornung, Y Igarashi, N Ikeno, M Iwasaki, D Jido, N Kalantar-Nayestanaki, R Kanungo, R Knöbel, N Kurz, V Metag, I Mukha, T Nagae, H Nagahiro, M Nanova, T Nishi, H J Ong, S Pietri, A Prochazka, C Rappold, M P Reiter, J L Rodríguez-Sánchez, C Scheidenberger, H Simon, B Sitar, P Strmen, B Sun, K Suzuki, I Szarka, M Takechi, I Tanihata, S Terashima, Y N Watanabe, H Weick, E Widmann, J S Winfield, X Xu, H Yamakami, J Zhao
Excitation spectra of ^{11}C are measured in the ^{12}C(p,d) reaction near the η^{'} emission threshold. A proton beam extracted from the synchrotron SIS-18 at GSI with an incident energy of 2.5 GeV impinges on a carbon target. The momenta of deuterons emitted at 0° are precisely measured with the fragment separator (FRS) operated as a spectrometer. In contrast to theoretical predictions on the possible existence of deeply bound η^{'}-mesic states in carbon nuclei, no distinct structures are observed associated with the formation of bound states...
November 11, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27869752/extracting-plant-phenology-metrics-in-a-great-basin-watershed-methods-and-considerations-for-quantifying-phenophases-in-a-cold-desert
#18
Keirith A Snyder, Bryce L Wehan, Gianluca Filippa, Justin L Huntington, Tamzen K Stringham, Devon K Snyder
Plant phenology is recognized as important for ecological dynamics. There has been a recent advent of phenology and camera networks worldwide. The established PhenoCam Network has sites in the United States, including the western states. However, there is a paucity of published research from semi-arid regions. In this study, we demonstrate the utility of camera-based repeat digital imagery and use of R statistical phenopix package to quantify plant phenology and phenophases in four plant communities in the semi-arid cold desert region of the Great Basin...
November 18, 2016: Sensors
https://www.readbyqxmd.com/read/27859095/controls-on-carbon-storage-and-weathering-in-volcanic-soils-across-a-high-elevation-climate-gradient-on-mauna-kea-hawaii
#19
Marc G Kramer, Oliver A Chadwick
Volcanic ash soils retain the largest and most persistent soil carbon pools of any ecosystem. However, the mechanisms governing soil carbon accumulation and weathering during initial phases of ecosystem development are not well understood. We examined soil organic matter dynamics and soil development across a high-altitude (3,560-3,030 m) 20-kyr climate gradient on Mauna Kea in Hawaii. Four elevation sites were selected (~250-500 mm rainfall), which range from sparsely vegetated to sites that contain a mix of shrubs and grasses...
September 2016: Ecology
https://www.readbyqxmd.com/read/27859094/productivity-and-species-richness-in-longleaf-pine-woodlands-resource-disturbance-influences-across-an-edaphic-gradient
#20
L K Kirkman, L M Giencke, R S Taylor, L R Boring, C L Staudhammer, R J Mitchell
This study examines the complex feedback mechanisms that regulate a positive relationship between species richness and productivity in a longleaf pine-wiregrass woodland. Across a natural soil moisture gradient spanning wet-mesic to xeric conditions, two large scale manipulations over a 10-yr period were used to determine how limiting resources and fire regulate plant species diversity and productivity at multiple scales. A fully factorial experiment was used to examine productivity and species richness responses to N and water additions...
September 2016: Ecology
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