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https://www.readbyqxmd.com/read/28241388/two-centuries-of-masting-data-for-european-beech-and-norway-spruce-across-the-european-continent
#1
Davide Ascoli, Janet Maringer, Andy Hacket-Pain, Marco Conedera, Igor Drobyshev, Renzo Motta, Mara Cirolli, Władysław Kantorowicz, Christian Zang, Silvio Schueler, Luc Croisé, Pietro Piussi, Roberta Berretti, Ciprian Palaghianu, Marjana Westergren, Jonathan G A Lageard, Anton Burkart, Regula Gehrig Bichsel, Peter A Thomas, Burkhard Beudert, Rolf Övergaard, Giorgio Vacchiano
Tree masting is one of the most intensively studied ecological processes. It affects nutrient fluxes of trees, regeneration dynamics in forests, animal population densities, and ultimately influences ecosystem services. Despite a large volume of research focused on masting, its evolutionary ecology, spatial and temporal variability and environmental drivers are still matter of debate. Understanding the proximate and ultimate causes of masting at broad spatial and temporal scales will enable us to predict tree reproductive strategies and their response to changing environment...
February 27, 2017: Ecology
https://www.readbyqxmd.com/read/28241375/specific-gravity-of-woody-tissue-from-lowland-neotropical-plants-differences-among-forest-types
#2
Luisa Fernanda Casas, Ana María Aldana, Francisco Henao-Diaz, Boris Villanueva, Pablo R Stevenson
Wood density, or more precisely, wood specific gravity, is an important parameter when estimating above ground biomass, which has become a central tool for the management and conservation of forests around the world. When using biomass allometric equations for tropical forests, researchers are often required to assume phylogenetic trait conservatism, which allows to assign genus and family level wood specific gravity mean values, to many woody species. The lack of information on this trait for many Neotropical plant species has led to an imprecise estimation of the biomass stored in Neotropical forests...
February 27, 2017: Ecology
https://www.readbyqxmd.com/read/28241033/intraspecific-leaf-trait-variability-along-a-boreal-to-tropical-community-diversity-gradient
#3
Cristina C Bastias, Claire Fortunel, Fernando Valladares, Christopher Baraloto, Raquel Benavides, William Cornwell, Lars Markesteijn, Alexandre A de Oliveira, Jeronimo B B Sansevero, Marcel C Vaz, Nathan J B Kraft
Disentangling the mechanisms that shape community assembly across diversity gradients is a central matter in ecology. While many studies have explored community assembly through species average trait values, there is a growing understanding that intraspecific trait variation (ITV) can also play a critical role in species coexistence. Classic biodiversity theory hypothesizes that higher diversity at species-rich sites can arise from narrower niches relative to species-poor sites, which would be reflected in reduced ITV as species richness increases...
2017: PloS One
https://www.readbyqxmd.com/read/28241005/sand-fly-population-dynamics-and-cutaneous-leishmaniasis-among-soldiers-in-an-atlantic-forest-remnant-in-northeastern-brazil
#4
Filipe Dantas-Torres, Kamila Gaudêncio da Silva Sales, Débora Elienai de Oliveira Miranda, Fernando José da Silva, Luciana Aguiar Figueredo, Fábio Lopes de Melo, Maria Edileuza Felinto de Brito, Maria Sandra Andrade, Sinval P Brandão-Filho
Outbreaks of cutaneous leishmaniasis are relatively common among soldiers involved in nocturnal activities in tropical forests. We investigated the population dynamics of sand flies in a military training camp located in a remnant of Atlantic rainforest in northeastern Brazil, where outbreaks of cutaneous leishmaniasis have sporadically been described. From July 2012 to July 2014, light traps were monthly placed in 10 collection sites, being nine sites located near the forest edge and one near a horse stable...
February 27, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28240020/prognostic-factors-for-survival-in-patients-with-gastric-cancer-using-a-random-survival-forest
#5
Davoud Adham, Nategh Abbasgholizadeh, Malek Abazari
Background: Gastric cancer is the fifth most common cancer and the third top cause of cancer related death with about 1 million new cases and 700,000 deaths in 2012. The aim of this investigation was to identify important factors for outcome using a random survival forest (RSF) approach. Materials and Methods: Data were collected from 128 gastric cancer patients through a historical cohort study in Hamedan-Iran from 2007 to 2013. The event under consideration was death due to gastric cancer. The random survival forest model in R software was applied to determine the key factors affecting survival...
1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28239609/application-of-taxonomic-modeling-to-microbiota-data-mining-for-detection-of-helminth-infection-in-global-populations
#6
Mahbaneh Eshaghzadeh Torbati, Makedonka Mitreva, Vanathi Gopalakrishnan
Human microbiome data from genomic sequencing technologies is fast accumulating, giving us insights into bacterial taxa that contribute to health and disease. The predictive modeling of such microbiota count data for the classification of human infection from parasitic worms, such as helminths, can help in the detection and management across global populations. Real-world datasets of microbiome experiments are typically sparse, containing hundreds of measurements for bacterial species, of which only a few are detected in the bio-specimens that are analyzed...
December 2016: Data (Basel)
https://www.readbyqxmd.com/read/28239373/variations-of-soil-microbial-community-structures-beneath-broadleaved-forest-trees-in-temperate-and-subtropical-climate-zones
#7
Sihang Yang, Yuguang Zhang, Jing Cong, Mengmeng Wang, Mengxin Zhao, Hui Lu, Changyi Xie, Caiyun Yang, Tong Yuan, Diqiang Li, Jizhong Zhou, Baohua Gu, Yunfeng Yang
Global warming has shifted climate zones poleward or upward. However, understanding the responses and mechanism of microbial community structure and functions relevant to natural climate zone succession is challenged by the high complexity of microbial communities. Here, we examined soil microbial community in three broadleaved forests located in the Wulu Mountain (WLM, temperate climate), Funiu Mountain (FNM, at the border of temperate and subtropical climate zones), or Shennongjia Mountain (SNJ, subtropical climate)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28238703/competition-for-light-in-forest-population-dynamics-from-computer-simulator-to-mathematical-model
#8
Pierre Magal, Zhengyang Zhang
In this article we build a mathematical model for forest growth and we compare this model with a computer forest simulator named SORTIE. The main ingredient taken into account in both models is the competition for light between trees. The parameters of the mathematical model are estimated by using SORTIE model, when the parameter values of SORTIE model correspond to the ones previously evaluated for the Great Mountain Forest in USA. We see that the best fit of the parameters of the mathematical model is obtained when the competition for light influences only the growth rate of trees...
February 23, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28238418/foxa1-is-expressed-in-ovarian-mucinous-neoplasms
#9
Georgia Karpathiou, Melany Venet, Mousa Mobarki, Fabien Forest, Celine Chauleur, Michel Peoc'h
FOXA1 is a transcription factor essential for the binding and action of other transcription factors on the chromatin. It is the major regulator of endoderm differentiation. It has important roles in breast, prostate and endometrial cancer. It has never been studied in ovarian tumours. The aim of this study was to investigate its expression in ovarian epithelial neoplasms. A total of 195 primary ovarian epithelial borderline or malignant tumours were immunohistochemically studied for the expression of FOXA1...
February 23, 2017: Pathology
https://www.readbyqxmd.com/read/28238049/intraspecific-and-phylogenetic-density-dependent-seedling-recruitment-in-a-subtropical-evergreen-forest
#10
Yanjun Du, Simon A Queenborough, Lei Chen, Yunquan Wang, Xiangcheng Mi, Keping Ma, Liza S Comita
Recent evidence suggests that plant performance can be influenced by the phylogenetic diversity of neighboring plants. However, no study to date has examined the effect of such phylogenetic density dependence on the transition from seed to seedling. Using 6 years of data on seedling recruitment and seed rain of 13 species from 130 stations (one 0.5 m(2) seed trap and three adjacent 1 m(2) seedling plots) in a subtropical evergreen forest, we asked: (1) Does negative density dependence act across seed to seedling stages? (2) Is there evidence for phylogenetic density dependence during the seed to seedling transition? (3) Does the strength of density dependence vary among years? Generalized linear mixed-effects models were used to model seed to seedling transition as a function of conspecific seed and seedling densities, heterospecific seed and seedling densities, and mean phylogenetic distance of heterospecific seeds and seedling...
February 25, 2017: Oecologia
https://www.readbyqxmd.com/read/28237467/storage-and-stability-of-biochar-derived-carbon-and-total-organic-carbon-in-relation-to-minerals-in-an-acid-forest-soil-of-the-spanish-atlantic-area
#11
Oihane Fernández-Ugalde, Nahia Gartzia-Bengoetxea, Javier Arostegi, Lur Moragues, Ander Arias-González
Biochar can largely contribute to enhance organic carbon (OC) stocks in soil and improve soil quality in forest and agricultural lands. Its contribution depends on its recalcitrance, but also on its interactions with minerals and other organic compounds in soil. Thus, it is important to study the link between minerals, natural organic matter and biochar in soil. In this study, we investigated the incorporation of biochar-derived carbon (biochar-C) into various particle-size fractions with contrasting mineralogy and the effect of biochar on the storage of total OC in the particle-size fractions in an acid loamy soil under Pinus radiata (C3 type) in the Spanish Atlantic area...
February 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28237461/the-history-of-mercury-pollution-near-the-spolana-chlor-alkali-plant-neratovice-czech-republic-as-recorded-by-scots-pine-tree-rings-and-other-bioindicators
#12
Tomáš Navrátil, Martin Šimeček, James B Shanley, Jan Rohovec, Maria Hojdová, Jakub Houška
We assessed >100years of mercury (Hg) pollution recorded in the tree rings of Scots Pine near a Czech chlor-alkali plant operating since 1941. Hg concentrations in tree rings increased with the launching of plant operations and decreased when Hg emissions decreased in 1975 due to an upgrade in production technology. Similar to traditional bioindicators of pollution such as pine needles, bark and forest floor humus, Hg concentrations in Scots Pine boles decreased with distance from the plant. Mean Hg in pine bole in the 1940s ranged from 32...
February 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28237395/network-connectivity-value
#13
Arnaud Dragicevic, Vincent Boulanger, Max Bruciamacchie, Sandrine Chauchard, Jean-Luc Dupouey, Anne Stenger
In order to unveil the value of network connectivity, we formalize the construction of ecological networks in forest environments as an optimal control dynamic graph-theoretic problem. The network is based on a set of bioreserves and patches linked by ecological corridors. The node dynamics, built upon the consensus protocol, form a time evolutive Mahalanobis distance weighted by the opportunity costs of timber production. We consider a case of complete graph, where the ecological network is fully connected, and a case of incomplete graph, where the ecological network is partially connected...
February 22, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28237310/sampling-design-and-required-sample-size-for-evaluating-contamination-levels-of-137-cs-in-japanese-fir-needles-in-a-mixed-deciduous-forest-stand-in-fukushima-japan
#14
Yurika Oba, Toshihiro Yamada
We estimated the sample size (the number of samples) required to evaluate the concentration of radiocesium ((137)Cs) in Japanese fir (Abies firma Sieb. & Zucc.), 5 years after the outbreak of the Fukushima Daiichi Nuclear Power Plant accident. We investigated the spatial structure of the contamination levels in this species growing in a mixed deciduous broadleaf and evergreen coniferous forest stand. We sampled 40 saplings with a tree height of 150 cm-250 cm in a Fukushima forest community. The results showed that: (1) there was no correlation between the (137)Cs concentration in needles and soil, and (2) the difference in the spatial distribution pattern of (137)Cs concentration between needles and soil suggest that the contribution of root uptake to (137)Cs in new needles of this species may be minor in the 5 years after the radionuclides were released into the atmosphere...
February 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28237252/effect-of-ebola-virus-disease-on-maternal-and-child-health-services-in-guinea-a-retrospective-observational-cohort-study
#15
Alexandre Delamou, Alison M El Ayadi, Sidikiba Sidibe, Therese Delvaux, Bienvenu S Camara, Sah D Sandouno, Abdoul H Beavogui, Georges W Rutherford, Junko Okumura, Wei-Hong Zhang, Vincent De Brouwere
BACKGROUND: The 2014 west African epidemic of Ebola virus disease posed a major threat to the health systems of the countries affected. We sought to quantify the consequences of Ebola virus disease on maternal and child health services in the highly-affected Forest region of Guinea. METHODS: We did a retrospective, observational cohort study of women and children attending public health facilities for antenatal care, institutional delivery, and immunisation services in six of seven health districts in the Forest region (Beyla, Guéckédou, Kissidougou, Lola, Macenta, and N'Zérékoré)...
February 22, 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28237239/meteorological-conditions-and-land-cover-as-predictors-for-the-prevalence-of-bluetongue-virus-in-the-inner-mongolia-autonomous-region-of-mainland-china
#16
Xiang Gao, Hongyu Qin, Jianhua Xiao, Hongbin Wang
Bluetongue is a major disease of economic importance that affects ruminants worldwide. It is transmitted by species of Culicoides midges (Diptera: Ceratopogonidae). The Inner Mongolia Autonomous Region is one of the main pastoral areas for farmed sheep in Mainland China and, because of its large area, represents an ideal candidate region for the study of Bluetongue virus (BTV) distribution and prevalence characteristics. The present study conducted a detailed investigation into the spatial patterns of BTV transmission in sheep in the Inner Mongolia Autonomous Region, and assessed the inter-relationships between meteorological factors, land cover and the transmission of the virus was conducted...
March 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28237236/influenza-a-virus-in-swine-breeding-herds-combination-of-vaccination-and-biosecurity-practices-can-reduce-likelihood-of-endemic-piglet-reservoir
#17
L A White, M Torremorell, M E Craft
Recent modelling and empirical work on influenza A virus (IAV) suggests that piglets play an important role as an endemic reservoir. The objective of this study is to test intervention strategies aimed at reducing the incidence of IAV in piglets and ideally, preventing piglets from becoming exposed in the first place. These interventions include biosecurity measures, vaccination, and management options that swine producers may employ individually or jointly to control IAV in their herds. We have developed a stochastic Susceptible-Exposed-Infectious-Recovered-Vaccinated (SEIRV) model that reflects the spatial organization of a standard breeding herd and accounts for the different production classes of pigs therein...
March 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28236707/effect-of-landscape-tree-cover-sex-and-season-on-the-bioaccumulation-of-persistent-organochlorine-pesticides-in-fruit-bats-of-riparian-corridors-in-eastern-mexico
#18
Carolina Valdespino, Vinicio J Sosa
Riparian forests are recognized as important ecosystems for biodiversity conservation in transformed landscapes. Many animal species that use this type of vegetation facilitate its recovery through pollination and seed dispersal. In landscapes dominated by agrosystems and cattle ranching, persistent organochlorine pesticides (OCPs) in the riparian system may have an effect on the physiology and fitness of animals. In this study, we measured bioaccumulation of OCPs in the most abundant frugivorous bat, Sturnira hondurensis, from the upper part of La Antigua basin, Veracruz, Mexico and, from these data, estimated accumulation by the frugivorous bat community of riparian forests in contrasting, transformed (TL) and forested (FL) landscapes...
February 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28236260/varying-rotation-lengths-in-northern-production-forests-implications-for-habitats-provided-by-retention-and-production-trees
#19
Adam Felton, Johan Sonesson, Urban Nilsson, Tomas Lämås, Tomas Lundmark, Annika Nordin, Thomas Ranius, Jean-Michel Roberge
Because of the limited spatial extent and comprehensiveness of protected areas, an increasing emphasis is being placed on conserving habitats which promote biodiversity within production forest. For this reason, alternative silvicultural programs need to be evaluated with respect to their implications for forest biodiversity, especially if these programs are likely to be adopted. Here we simulated the effect of varied rotation length and associated thinning regimes on habitat availability in Scots pine and Norway spruce production forests, with high and low productivity...
February 24, 2017: Ambio
https://www.readbyqxmd.com/read/28235731/carbon-dynamics-on-agricultural-land-reverting-to-woody-land-in-ontario-canada
#20
Mihai F Voicu, Cindy Shaw, Werner A Kurz, Ted Huffman, Jiangui Liu, Max Fellows
The 2015 Paris Agreement reinforces the importance of the land sector and its contribution to greenhouse gas (GHG) reductions. Thus, there is growing interest in improving estimates of the GHG balance in response to land-use changes (LUCs) involving agriculture and forestry, for national-scale reporting, and for carbon (C) offsets. Large agricultural areas in Europe, Russia and North America are reverting to forest, either naturally or through planting, after abandonment of agricultural land, and this trend may have a substantial impact on carbon budgets...
February 21, 2017: Journal of Environmental Management
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