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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Trees (0):
Recent article
Trees
Abstract
We analyzed data on the distribution of tree cover in Africa, Australia, and South America to reveal strong evidence for the existence of three distinct attractors: forest, savanna, and a treeless state. Empirical reconstruction of the basins of attraction indicates that the resilience of the states...
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PMID: 21998390
PDF is available here.
PDF is available here.
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Abstract
Abstract
We use tree cover, climate, fire, and soils data sets to show that tree cover is globally discontinuous. Climate influences tree cover globally but, at intermediate rainfall (1000 to 2500 millimeters) with mild seasonality (less than 7 months), tree cover is bimodal, and only fire differentiates bet...
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PMID: 21998389
PDF is available here.
PDF is available here.
American Naturalist (178)S1 2011
Abstract
We assess these theories in an analysis of the twofold decline in bird species richness along the Himalayas from the southeast to the northwest. The presence of fewer species in the northwest is entirely due to a steep decline in the number of forest species; species occupying more open habitats sho...
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PMID: 21956095
PDF is available here.
PDF is available here.
Abstract
This paper demonstrates that a recently proposed dynamical model for the ecology of Easter Island admits periodic and chaotic attractors, not previously reported. Such behavior may more realistically depict the population dynamics of general ecosystems and illustrates the power of simple models to pr...
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PMID: 21933513
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
We show that bedrock comprises a hitherto overlooked source of ecologically available N to forests. We report that the N content of soils and forest foliage on N-rich metasedimentary rocks (350-950 mg N kg(-1)) is elevated by more than 50% compared with similar temperate forest sites underlain...
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PMID: 21886160
PDF is available here.
PDF is available here.
Ecological Applications (21)5 2011
Abstract
We propose that three conditions should be met before implementing assisted migration in reforestation programs: (1) evidence of a climate-related adaptational lag, (2) observed biological impacts, and (3) robust model projections to target assisted migration efforts. In a case study of aspen (Popul...
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PMID: 21830704
PDF is available here.
PDF is available here.
Abstract
Abstract
We assessed suites of environmental factors to identify areas of transmission risk in forested regions of southern Brazil. We studied all officially confirmed cases from the Epidemiological Surveillance System of the Brazilian Health Ministry from Atlantic Forest and Araucaria forest areas of southe...
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PMID: 21605537
PDF is available here.
PDF is available here.
Abstract
Many models for the acoustical properties of rigid-porous media require knowledge of parameter values that are not available for outdoor ground surfaces. The relationship used between tortuosity and porosity for stacked spheres results in five characteristic impedance models that require not more tha...
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PMID: 21568385
PDF is available here.
PDF is available here.
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (369)1943 2011
Abstract
The African continent contributes one of the largest uncertainties to the global CO(2) budget, because very few long-term measurements are carried out in this region. The contribution of Africa to the global carbon cycle is characterized by its low fossil fuel emissions, a rapidly increasing populati...
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PMID: 21502175
PDF is available here.
PDF is available here.
Abstract
Serum arginase levels and the mean total nasal symptoms scores were significantly lower in the treatment group after montelukast sodiumadministration compared with the baseline levels (p = 0.001). Serum arginase levels were significantly lower in the treatment group compared with the control group (...
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PMID: 21439134
PDF is available here.
PDF is available here.
Abstract
Information on natural breeding sites of phlebotomine sand flies is scanty, due to the difficulties of isolation of immatures from the soil where they occur. The present study investigated breeding sites in several microhabitats in a "terra-firme" forest in Pitinga, Amazonas State, Brazil. Results on...
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PMID: 21457701
PDF is available here.
PDF is available here.
Journal of Vector Ecology (36 Suppl 1) 2011
Abstract
These results suggest that L. whitmani may potentially be the principal vector of ACL in the region, even though the sand fly fauna was diverse: 88% were L.whitmani and 12% belonged to 11 other species. Two other species, L. complexa (1.3%) and L. migonei (0.8%), considered to be ACL vectors in othe...
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PMID: 21366783
PDF is available here.
PDF is available here.
Ecological Applications (21)2 2011
Abstract
We collected over 5300 spiders across multiple transects in the Bavarian National Park (Germany) using pitfall traps. We examined spider community characteristics (species richness, the Shannon index, the Simpson index, community composition, mean body size, and abundance) and single-species distrib...
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PMID: 21563587
PDF is available here.
PDF is available here.
Abstract
Abstract
We compiled geographic range data for 180 bird, 119 butterfly, 204 tree and 219 understorey plant species sampled along a gradient of habitat modification ranging from near-primary forest through young secondary forest and agroforestry systems to annual crops in the southwestern lowlands of Cameroon...
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PMID: 21298054
PDF is available here.
PDF is available here.
Abstract
We developed regression models with a stepwise protocol selecting the optimal number of significant explanatory variables. Configuration variables such as contagion, the cohesion of cropland and urban land, and the aggregation index of forest were very important and more important than variables ass...
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PMID: 21520759
PDF is available here.
PDF is available here.
Abstract
Abstract
A cover with capillary barrier effects (CCBE) was constructed in 1998 on the abandoned Lorraine mine tailings impoundment to limit the generation of acid mine drainage. The Ministry of Natural Resources and Fauna of Quebec (MRNF) is responsible for the site and for all restoration works on it, includ...
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PMID: 21488502
PDF is available here.
PDF is available here.
Waste Management (31)1 2011
Abstract
Five woody plants species (i.e. Terminalia arjuna, Prosopis juliflora, Populus alba, Eucalyptus tereticornis and Dendrocalamus strictus) were selected for phytoremediation and grow on tannery sludge dumps of Common Effluent Treatment Plant (CETP), Unnao (Uttar Pradesh), India. Concentration of toxic...
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PMID: 20889325
PDF is available here.
PDF is available here.
Abstract
We emend the description of G. guanacastensis to include morphometrics on the zygospores, based on discovery of the sexual spores for that species in our collections. Thirteen other previously described species, which are new for Mexico, include G. homothallica, Pennella montana, Simuliomyces micros...
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PMID: 21186326
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
The aim of this study is to describe interactions between hummingbirds and ornithophilous species at Serra da Bodoquena in midwest Brazil, with focus on flowering phenology and pollination of these plant species. In two habitats, gallery forest and semi-deciduous forest, data on flowering phenology...
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PMID: 21152758
PDF is available here.
PDF is available here.
Abstract
In view of the lower radionuclide activities of moss and lichen, tree barks can be used as biomonitors of radioactive contamination, regardless of the contribution of soil uptake. The present study was conducted to determine the activity concentrations of (137)Cs, (40)K, (232)Th and (238)U in the ba...
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PMID: 20678943
PDF is available here.
PDF is available here.
Abstract
Abstract
We explored the interacting effects of marine-derived nutrient fertilization and physical disturbance introduced by coastal river otters (Lontra canadensis) on the production and nutrient status of pristine shrub and tree communities in Prince William Sound, Alaska, USA. We compared production of tr...
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PMID: 21141179
PDF is available here.
PDF is available here.
Abstract
We tested whether species abundance on that plant could be explained by mass allometry, intrinsic population growth, diet breadth, or some combination of these traits. We parameterized life history traits of the caterpillars in association with the host plant in both field and laboratory settings, s...
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PMID: 21141188
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
For nearly 100 million years, the India subcontinent drifted from Gondwana until its collision with Asia some 50 Ma, during which time the landmass presumably evolved a highly endemic biota. Recent excavations of rich outcrops of 50-52-million-year-old amber with diverse inclusions from the Cambay S...
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PMID: 20974929
PDF is available here.
PDF is available here.
Abstract
Abstract
The essential oils from leaves, twigs and stems of large trees and shrub-like trees of Thuja sutchuenensis were extracted by hydrodistillation and supercritical fluid extraction, and analyzed by GC and GC-MS. The essential oil composition differed significantly among the three organs, as well as bet...
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PMID: 21121271
PDF is available here.
PDF is available here.
Abstract
A Gram-staining-negative, yellow-coloured, strictly aerobic, non-spore-forming, rod-shaped bacterium, designated HS39(T), isolated from a soil sample collected from a natural Populus euphratica forest in Xinjiang, China, was characterized using a polyphasic approach. The isolate grew optimally at 30...
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PMID: 19933581
PDF is available here.
PDF is available here.
Abstract
An actinobacterial strain was isolated from subarctic forest soil, and subjected to polyphasic taxonomic characterization. The cell-wall peptidoglycan comprised meso-diaminopimelic acid, alanine and glutamic acid. MK-9(H₄) was the predominant isoprenoid quinone, and iso-C₁₇:₀, iso-C₁₅:...
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PMID: 19946054
PDF is available here.
PDF is available here.
Microbial Ecology (60)3 2010
Abstract
Communities of archaea, bacteria, and fungi were examined in forest soils located in the Oregon Coast Range and the inland Cascade Mountains. Soils from replicated plots of Douglas-fir (Pseudotsuga menziesii) and red alder (Alnus rubra) were characterized using fungal ITS (internal transcribed space...
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PMID: 20449582
PDF is available here.
PDF is available here.
Abstract
We investigated the potential use of call playback for surveying the elusive golden-backed uakari (Cacajao melanocephalus), a diurnal social primate that typically inhabits the relatively inaccessible black-water swamp forests of the upper Amazon (Igapó forest) during the wet season. Furthermore, o...
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PMID: 20635117
PDF is available here.
PDF is available here.
Ecological Applications (20)7 2010
Abstract
We provide a comprehensive analysis of vertical and horizontal woody vegetation structure across one of the oldest savanna fire experiments, using new airborne Light Detection and Ranging (LiDAR) technology. We developed and compared high-resolution woody vegetation height surfaces for a series of l...
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PMID: 21049875
PDF is available here.
PDF is available here.
Ecological Applications (20)7 2010
Abstract
We document that fire-excluded ponderosa pine forests of the northern Rocky Mountains logged prior to 1960 have much higher average stand density, greater homogeneity of stand structure, more standing dead trees and increased abundance of fire-intolerant trees than paired fire-excluded, unlogged cou...
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PMID: 21049874
PDF is available here.
PDF is available here.
Ecological Applications (20)7 2010
Abstract
We used a landscape-scale survey of A. harpophylla regrowth to test the following hypotheses: (1) management history, in combination with climatic and edaphic factors, has long-term effects on stem densities, and (2) higher-density stands have lower restoration and carbon potential, which is also in...
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PMID: 21049873
PDF is available here.
PDF is available here.
Ecological Applications (20)7 2010
Abstract
We developed a habitat selection model to predict the expected patterns in patch-level density, fitness, and individual quality derived from either accurate assessment of habitat quality or from undervaluing of habitat patches (i.e., quality is not correctly assessed). Unlike previous habitat select...
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PMID: 21049889
PDF is available here.
PDF is available here.
Abstract
For nearly 150 years after its foundation, Fellows of the Royal Society collected information on trees, investigated their anatomy and physiology, promoted planting and improved planting practices, and introduced, naturalized and classified foreign species. Their discoveries and advice were widely d...
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PMID: 20973448
PDF is available here.
PDF is available here.
Abstract
We investigated the role of post-fire residual organic matter (ROM) thickness as a driver of community assembly in eastern Newfoundland. We hypothesized that if post-fire community assembly is predominantly controlled by ROM thickness (an abiotic habitat filter), then post-fire species composition a...
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PMID: 20461414
PDF is available here.
PDF is available here.
Fungal Biology (114)9 2010
Abstract
Phytophthora pinifolia is the causal agent of the recently discovered needle disease of Pinus radiata in Chile, referred to as "Daño Foliar del Pino" (DFP). The genetic structure of the pathogen population is unknown, which hinders our understanding of its appearance and spread in...
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PMID: 20943184
PDF is available here.
PDF is available here.
Abstract
We experimentally tested the parasitism hypothesis of moth population cycles by establishing a four-year parasitoid-exclusion experiment, with parasitoid-proof exclosures, parasitoid-permeable exclosures, and control plots. The exclusion of parasitoids led to high autumnal moth abundances, while the...
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PMID: 20957940
PDF is available here.
PDF is available here.
Abstract
We examined whether interactions between tree seedlings and their associated arbuscular mycorrhizal fungi (AMF) lead to plant-soil feedback. Specifically, do tropical seedlings modify their own AMF communities in a manner that either favors or inhibits the next cohort of conspecific seedlings (i.e.,...
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PMID: 20957954
PDF is available here.
PDF is available here.
Abstract
Abstract
We report that iron-reducing bacteria are primary mediators of anaerobic carbon oxidation in upland tropical soils spanning a rainfall gradient (3500-5000 mm/yr) in northeast Puerto Rico. The abundant rainfall and high net primary productivity of these tropical forests provide optimal soil habitat f...
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PMID: 20957955
PDF is available here.
PDF is available here.
Abstract
We evaluated sapling responses to stem snapping for 49 moist-forest species and 36 dry-forest species from two Bolivian tropical forests. To this end we compared in a field experiment the survival and height growth of clipped and control saplings for a two-year period, and related this to the shade...
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PMID: 20957956
PDF is available here.
PDF is available here.
Abstract
Fall from height is one of the important causes of musculoskeletal injuries. Fall from walnut trees constitutes an important entity that leads to a significant mortality and morbidity amongst those engaged in fruit collection. The present study aimed to determine the prevalence of different musculos...
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PMID: 21038127
PDF is available here.
PDF is available here.
Environmental Management (46)3 2010
Abstract
We present five case studies to explore how local-level management has attempted to control this disease. From these case studies, we glean three lessons: connections count, scale matters, and building capacity is crucial. These lessons may help management, research, and education planning for futur...
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PMID: 20559634
PDF is available here.
PDF is available here.
Abstract
In total 2676 strains of actinomycetes were isolated from these samples. The 16S rRNA gene sequences of 98 selected strains were determined, and the phylogenetic analysis was carried out. 13, 5, 9 and 20 genera were identified from Forest of Huangjin, Emei and Qingcheng Mountains (one sample area),...
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PMID: 20931865
PDF is available here.
PDF is available here.
Abstract
We test the hypothesis that deer act as vehicles for moving ticks between two distinct habitats: forest and open heather moorland. We utilised an ideal "natural experiment" whereby forests were either fenced or unfenced to prevent or allow deer to move between habitats. We aimed to test the hypothes...
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PMID: 20211625
PDF is available here.
PDF is available here.
Abstract
Abstract
We explore the effects of temperature and rainfall characteristics on the quantity and composition of DOM mobilized from laboratory columns packed with an unsaturated forest soil. Our observations demonstrate that changes in temperature and a five-month drought period affect the mass and structure o...
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PMID: 20552956
PDF is available here.
PDF is available here.