keyword
MENU ▼
Read by QxMD icon Read
search

Rainforest

keyword
https://www.readbyqxmd.com/read/28101433/use-of-sonic-tomography-to-detect-and-quantify-wood-decay-in-living-trees
#1
Gregory S Gilbert, Javier O Ballesteros, Cesar A Barrios-Rodriguez, Ernesto F Bonadies, Marjorie L Cedeño-Sánchez, Nohely J Fossatti-Caballero, Mariam M Trejos-Rodríguez, José Moises Pérez-Suñiga, Katharine S Holub-Young, Laura A W Henn, Jennifer B Thompson, Cesar G García-López, Amanda C Romo, Daniel C Johnston, Pablo P Barrick, Fulvia A Jordan, Shiran Hershcovich, Natalie Russo, Juan David Sánchez, Juan Pablo Fábrega, Raleigh Lumpkin, Hunter A McWilliams, Kathleen N Chester, Alana C Burgos, E Beatriz Wong, Jonathan H Diab, Sonia A Renteria, Jennifer T Harrower, Douglas A Hooton, Travis C Glenn, Brant C Faircloth, Stephen P Hubbell
PREMISE OF THE STUDY: Field methodology and image analysis protocols using acoustic tomography were developed and evaluated as a tool to estimate the amount of internal decay and damage of living trees, with special attention to tropical rainforest trees with irregular trunk shapes. METHODS AND RESULTS: Living trunks of a diversity of tree species in tropical rainforests in the Republic of Panama were scanned using an Argus Electronic PiCUS 3 Sonic Tomograph and evaluated for the amount and patterns of internal decay...
December 2016: Applications in Plant Sciences
https://www.readbyqxmd.com/read/28100827/insights-into-resource-consumption-cross-feeding-system-collapse-stability-and-biodiversity-from-an-artificial-ecosystem
#2
Yu Liu, David Sumpter
Community ecosystems at very different levels of biological organization often have similar properties. Coexistence of multiple species, cross-feeding, biodiversity and fluctuating population dynamics are just a few of the properties that arise in a range of ecological settings. Here we develop a bottom-up model of consumer-resource interactions, in the form of an artificial ecosystem 'number soup', which reflects basic properties of many bacterial and other community ecologies. We demonstrate four key properties of the number soup model: (i) communities self-organize so that all available resources are fully consumed; (ii) reciprocal cross-feeding is a common evolutionary outcome, which evolves in a number of stages, and many transitional species are involved; (iii) the evolved ecosystems are often 'robust yet fragile', with keystone species required to prevent the whole system from collapsing; (iv) non-equilibrium dynamics and chaotic patterns are general properties, readily generating rich biodiversity...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28100818/lowland-biotic-attrition-revisited-body-size-and-variation-among-climate-change-winners-and-losers
#3
Jedediah F Brodie, Matthew Strimas-Mackey, Jayasilan Mohd-Azlan, Alys Granados, Henry Bernard, Anthony J Giordano, Olga E Helmy
The responses of lowland tropical communities to climate change will critically influence global biodiversity but remain poorly understood. If species in these systems are unable to tolerate warming, the communities-currently the most diverse on Earth-may become depauperate ('biotic attrition'). In response to temperature changes, animals can adjust their distribution in space or their activity in time, but these two components of the niche are seldom considered together. We assessed the spatio-temporal niches of rainforest mammal species in Borneo across gradients in elevation and temperature...
January 25, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28100029/isolation-with-asymmetric-gene-flow-during-the-nonsynchronous-divergence-of-dry-forest-birds
#4
Jessica A Oswald, Isaac Overcast, William M Mauck, Michael J Andersen, Brian Tilston Smith
Dry forest bird communities in South America are often fragmented by intervening mountains and rainforests, generating high local endemism. The historical assembly of communities often results from dynamic processes linked to numerous population histories among co-distributed species. Nevertheless, species may diversify in the same way through time if landscape and environmental features, or species ecologies, similarly structure populations. Here we tested whether six co-distributed taxon pairs that occur in the dry forests of the Tumbes and Marañón Valley of northwestern South America show concordant patterns and modes of diversification...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28100018/conversion-of-amazon-rainforest-to-agriculture-alters-community-traits-of-methane-cycling-organisms
#5
Kyle M Meyer, Ann M Klein, Jorge L M Rodrigues, Klaus Nüsslein, Susannah G Tringe, Babur S Mirza, James M Tiedje, Brendan J M Bohannan
Land use change is one of the greatest environmental impacts worldwide, especially to tropical forests. The Amazon rainforest has been subject to particularly high rates of land use change, primarily to cattle pasture. A commonly observed response to cattle pasture establishment in the Amazon is the conversion of soil from a methane sink in rainforest, to a methane source in pasture. However, it is not known how the microorganisms that mediate methane flux are altered by land use change. Here we use the deepest metagenomic sequencing of Amazonian soil to date to investigate differences in methane-cycling microorganisms and their traits across rainforest and cattle pasture soils...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28099772/exploring-the-symbiont-diversity-of-ancient-western-redcedars-arbuscular-mycorrhizal-fungi-of-long-lived-hosts
#6
Monika A Gorzelak, Brian J Pickles, Miranda M Hart
Arbuscular mycorrhizal fungi (AMF) are globally distributed, monophyletic root symbionts with ancient origins. Their contribution to carbon cycling and nutrient dynamics is ecologically important, given their obligate association with over 70% of vascular plant species. Current understanding of AMF species richness and community structure is based primarily on studies of grasses, herbs, and agricultural crops, typically in disturbed environments. Few studies have considered AMF interactions with long-lived woody perennial species in undisturbed ecosystems...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28098631/after-the-fall-the-tapestry-of-disturbance-and-recovery
#7
Nalini M Nadkarni
On July 3, 2015, Nalini Nadkarni, a world-renowned ecologist who had been studying the biologic processes of ecosystem disturbance and recovery, sustained a catastrophic 50-foot free-fall from the top of the rainforest canopy to the forest floor at her remote field research site. She lost consciousness in shock and sustained life-threatening injuries. Her accompanying students hiked out, radio-called 911, and the Harborview Medical Center (Seattle) Medivac team arrived 4 hours later to rescue her. Her prognosis was extremely grim; her family gathered in anticipation of her death as she underwent four operations during her 10 days in the ICU...
February 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28095487/dna-metabarcoding-of-amazonian-ichthyoplankton-swarms
#8
M E Maggia, Y Vigouroux, J F Renno, F Duponchelle, E Desmarais, J Nunez, C García-Dávila, F M Carvajal-Vallejos, E Paradis, J F Martin, C Mariac
Tropical rainforests harbor extraordinary biodiversity. The Amazon basin is thought to hold 30% of all river fish species in the world. Information about the ecology, reproduction, and recruitment of most species is still lacking, thus hampering fisheries management and successful conservation strategies. One of the key understudied issues in the study of population dynamics is recruitment. Fish larval ecology in tropical biomes is still in its infancy owing to identification difficulties. Molecular techniques are very promising tools for the identification of larvae at the species level...
2017: PloS One
https://www.readbyqxmd.com/read/28095437/relationship-of-climatic-and-forest-factors-to-drought-and-heat-induced-tree-mortality
#9
Qingyin Zhang, Ming'an Shao, Xiaoxu Jia, Xiaorong Wei
Tree mortality due to warming and drought is a critical aspect of forest ecosystem in responding to climate change. Spatial patterns of tree mortality induced by drought and its influencing factors, however, have yet to be documented at the global scale. We collected observations from 248 sites globally where trees have died due to drought and then assessed the effects of climatic and forest factors on the rate of tree mortality. The global mean annual mortality rate was 5.5%. The rate of tree mortality was significantly and negatively correlated with mean annual precipitation (P < 0...
2017: PloS One
https://www.readbyqxmd.com/read/28090412/development-characterization-and-cross-amplification-of-microsatellite-markers-in-the-understudied-african-genus-anthonotha-fabaceae
#10
Boris B Demenou, Olivier J Hardy
PREMISE OF THE STUDY: Anthonotha macrophylla (Fabaceae) is a common tree species throughout the Guineo-Congolian forest that is sometimes confounded with other congeneric species; it is expected to be an interesting phylogeographical model to infer the history of the African dense forests. We developed 18 microsatellite markers from this species and tested their transferability in 15 congeneric species. METHODS AND RESULTS: A genomic library was obtained using the Illumina platform, and 18 polymorphic microsatellite loci were developed...
January 2017: Applications in Plant Sciences
https://www.readbyqxmd.com/read/28079075/hydroclimate-changes-across-the-amazon-lowlands-over-the-past-45-000-years
#11
Xianfeng Wang, R Lawrence Edwards, Augusto S Auler, Hai Cheng, Xinggong Kong, Yongjin Wang, Francisco W Cruz, Jeffrey A Dorale, Hong-Wei Chiang
Reconstructing the history of tropical hydroclimates has been difficult, particularly for the Amazon basin-one of Earth's major centres of deep atmospheric convection. For example, whether the Amazon basin was substantially drier or remained wet during glacial times has been controversial, largely because most study sites have been located on the periphery of the basin, and because interpretations can be complicated by sediment preservation, uncertainties in chronology, and topographical setting. Here we show that rainfall in the basin responds closely to changes in glacial boundary conditions in terms of temperature and atmospheric concentrations of carbon dioxide...
January 11, 2017: Nature
https://www.readbyqxmd.com/read/28070978/testing-for-local-adaptation-and-evolutionary-potential-along-altitudinal-gradients-in-rainforest-drosophila-beyond-laboratory-estimates
#12
Eleanor K O'Brien, Megan Higgie, Alan Reynolds, Ary A Hoffmann, Jon R Bridle
Predicting how species will respond to the rapid climatic changes predicted this century is an urgent task. Species distribution models (SDMs) use the current relationship between environmental variation and species' abundances to predict the effect of future environmental change on their distributions. However, two common assumptions of SDMs are likely to be violated in many cases: (i) that the relationship of environment with abundance or fitness is constant throughout a species' range and will remain so in future and (ii) that abiotic factors (e...
January 10, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28059766/cognition-mediated-evolution-of-low-quality-floral-nectars
#13
Vladislav Nachev, Kai Petra Stich, Clemens Winter, Alan Bond, Alan Kamil, York Winter
Plants pollinated by hummingbirds or bats produce dilute nectars even though these animals prefer more concentrated sugar solutions. This mismatch is an unsolved evolutionary paradox. Here we show that lower quality, or more dilute, nectars evolve when the strength of preferring larger quantities or higher qualities of nectar diminishes as magnitudes of the physical stimuli increase. In a virtual evolution experiment conducted in the tropical rainforest, bats visited computer-automated flowers with simulated genomes that evolved relatively dilute nectars...
January 6, 2017: Science
https://www.readbyqxmd.com/read/28057063/avian-malaria-on-madagascar-bird-hosts-and-putative-vector-mosquitoes-of-different-plasmodium-lineages
#14
Sandrine Schmid, Anke Dinkel, Ute Mackenstedt, Michaël Luciano Tantely, Fano José Randrianambinintsoa, Sébastien Boyer, Friederike Woog
BACKGROUND: Avian malaria occurs almost worldwide and is caused by Haemosporida parasites (Plasmodium, Haemoproteus and Leucocytozoon). Vectors such as mosquitoes, hippoboscid flies or biting midges are required for the transmission of these parasites. There are few studies about avian malaria parasites on Madagascar but none about suitable vectors. METHODS: To identify vectors of avian Plasmodium parasites on Madagascar, we examined head, thorax and abdomen of 418 mosquitoes from at least 18 species using a nested PCR method to amplify a 524 bp fragment of the haemosporidian mitochondrial cytochrome b gene...
January 5, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28056072/clarifying-the-cryptic-host-specificity-of-blastocystis-spp-isolates-from-alouatta-palliata-and-a-pigra-howler-monkeys
#15
Claudia Villanueva-Garcia, Elias Jose Gordillo-Chavez, Eduardo Lopez-Escamilla, Emilio Rendon-Franco, Claudia Irais Muñoz-Garcia, Lilia Gama, Williams Arony Martinez-Flores, Nayeli Gonzalez-Rodriguez, Mirza Romero-Valdovinos, Hilda Diaz-Lopez, Jose Galian, Guiehdani Villalobos, Pablo Maravilla, Fernando Martinez-Hernandez
Although the presence of cryptic host specificity has been documented in Blastocystis, differences in infection rates and high genetic polymorphism within and between populations of some subtypes (ST) have impeded the clarification of the generalist or specialist specificity of this parasite. We assessed the genetic variability and host specificity of Blastocystis spp. in wild howler monkeys from two rainforest areas in the southeastern region of Mexico. Fecal samples of 225 Alouatta palliata (59) and A. pigra (166) monkeys, belonging to 16 sylvatic sites, were analyzed for infection with Blastocystis ST using a region of the small subunit rDNA (SSUrDNA) gene as a marker...
2017: PloS One
https://www.readbyqxmd.com/read/28054688/oh-production-from-the-photolysis-of-isoprene-derived-peroxy-radicals-cross-sections-quantum-yields-and-atmospheric-implications
#16
Robert F Hansen, Tom R Lewis, Lee Graham, Lisa K Whalley, Paul W Seakins, Dwayne E Heard, Mark A Blitz
In environments with high concentrations of biogenic volatile organic compounds and low concentrations of nitrogen oxides (NOx = NO + NO2), significant discrepancies have been found between measured and modeled concentrations of hydroxyl radical (OH). The photolysis of peroxy radicals from isoprene (HO-Iso-O2) in the near ultraviolet represents a potential source of OH in these environments, yet has not been considered in atmospheric models. This paper presents measurements of the absorption cross-sections for OH formation (σRO2,OH) from the photolysis of HO-Iso-O2 at wavelengths from 310-362...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28050931/scientists-as-citizens-and-knowers-in-the-detection-of-deforestation-in-the-amazon
#17
Marko Monteiro, Raoni Rajão
This paper examines how scientists deal with tensions emerging from their role as providers of objective knowledge and as citizens concerned with how their research influences policy and politics in Brazil. This is accomplished through an ethnographic account of scientists using remote sensing technology, of their knowledge-making activities and of the broader socio-political controversies that permeate the detection of deforestation in the Amazon rainforest. Strategies for mitigating uncertainty are central aspects of the knowledge practices analyzed, bringing controversies 'external' to the laboratory 'into' the lab, making these boundaries conceptually problematic...
January 1, 2017: Social Studies of Science
https://www.readbyqxmd.com/read/28049821/ancient-human-disturbances-may-be-skewing-our-understanding-of-amazonian-forests
#18
Crystal N H McMichael, Frazer Matthews-Bird, William Farfan-Rios, Kenneth J Feeley
Although the Amazon rainforest houses much of Earth's biodiversity and plays a major role in the global carbon budget, estimates of tree biodiversity originate from fewer than 1,000 forest inventory plots, and estimates of carbon dynamics are derived from fewer than 200 recensus plots. It is well documented that the pre-European inhabitants of Amazonia actively transformed and modified the forest in many regions before their population collapse around 1491 AD; however, the impacts of these ancient disturbances remain entirely unaccounted for in the many highly influential studies using Amazonian forest plots...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28049631/post-hurricane-successional-dynamics-in-abundance-and-diversity-of-canopy-arthropods-in-a-tropical-rainforest
#19
T D Schowalter, M R Willig, S J Presley
We quantified long-term successional trajectories of canopy arthropods on six tree species in a tropical rainforest ecosystem in the Luquillo Mountains of Puerto Rico that experienced repeated hurricane-induced disturbances during the 19-yr study (1991-2009). We expected: 1) differential performances of arthropod species to result in taxon- or guild-specific responses; 2) differences in initial conditions to result in distinct successional responses to each hurricane; and 3) the legacy of hurricane-created gaps to persist despite subsequent disturbances...
January 3, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28049485/the-dangers-of-accepting-a-single-diagnosis-case-report-of-concurrent-plasmodium-knowlesi-malaria-and-dengue-infection
#20
Soon Eu Chong, Rhendra Hardy Mohamad Zaini, Siti Suraiya, Kok Tong Lee, Jo Anne Lim
BACKGROUND: Dengue and malaria are two common, mosquito-borne infections, which may lead to mortality if not managed properly. Concurrent infections of dengue and malaria are rare due to the different habitats of its vectors and activities of different carrier mosquitoes. The first case reported was in 2005. Since then, several concurrent infections have been reported between the dengue virus (DENV) and the malaria protozoans, Plasmodium falciparum and Plasmodium vivax. Symptoms of each infection may be masked by a simultaneous second infection, resulting in late treatment and severe complications...
January 3, 2017: Malaria Journal
keyword
keyword
54941
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"