keyword
MENU ▼
Read by QxMD icon Read
search

Savanna

keyword
https://www.readbyqxmd.com/read/28644376/monitoring-effect-of-fire-on-ant-assemblages-in-brazilian-rupestrian-grasslands-contrasting-effects-on-ground-and-arboreal-fauna
#1
Diego Anjos, Ricardo Campos, Renata Campos, Sérvio Ribeiro
Fire is one of the most relevant ecological disturbances in nature. Little is known about the effects of fire on biodiversity in ecosystems like rupestrian grasslands, which share characteristics with savanna and forest biomes. Brazilian rupestrian grasslands are part of an endangered ecosystem that has been modified by anthropogenic fire events that have become more intense in recent decades. In this study, we evaluated the effects of fire on ground and arboreal ant assemblages through a two-year monitoring program (24 monthly samplings)...
June 23, 2017: Insects
https://www.readbyqxmd.com/read/28610330/catalogue-of-distribution-of-lizards-reptilia-squamata-from-the-brazilian-amazonia-iv-alopoglossidae-gymnophthalmidae
#2
Marco A Ribeiro-Júnior, Silvana Amaral
We present distribution data of all Alopoglossidae and Gymnophthalmidae lizards known from the Brazilian Amazonia, totaling 54 species-level taxa, belonging to 17 genera and two families. This represents 22 more species-level taxa than previously reported. Data were based on 17,431 specimens deposited in three North American and eight Brazilian museums, including the main collections harboring Amazonian material. Most species (~80%) are endemic to Amazonia; non-endemic species are mainly associated with open vegetation (savanna) enclaves or open dry (semideciduous) forest in Amazonia, with a few exceptions...
May 22, 2017: Zootaxa
https://www.readbyqxmd.com/read/28591179/a-systematic-review-of-elephant-impact-across-africa
#3
Robert A R Guldemond, Andrew Purdon, Rudi J van Aarde
Contradictory findings among scientific studies that address a particular issue may impede the conversion of science to management implementation. A systematic review of peer-reviewed studies to generate a single outcome may overcome this problem. The contentious topic of the impact that a megaherbivore such as the savanna elephant have for other species and their environment can benefit from such an approach. After some 68 years, 367 peer-reviewed papers covered the topic and 51 of these papers provided sufficient data to be included in a meta-analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28582433/travelling-to-the-south-phylogeographic-spatial-diffusion-model-in-monttea-aphylla-plantaginaceae-an-endemic-plant-of-the-monte-desert
#4
Matias C Baranzelli, Andrea Cosacov, Gabriela Ferreiro, Leigh A Johnson, Alicia N Sérsic
Effects of Pleistocene climatic oscillations on plant phylogeographic patterns are relatively well studied in forest, savanna and grassland biomes, but such impacts remain less explored on desert regions of the world, especially in South America. Here, we performed a phylogeographical study of Monttea aphylla, an endemic species of the Monte Desert, to understand the evolutionary history of vegetation communities inhabiting the South American Arid Diagonal. We obtained sequences of three chloroplast (trnS-trnfM, trnH-psbA and trnQ-rps16) and one nuclear (ITS) intergenic spacers from 272 individuals of 34 localities throughout the range of the species...
2017: PloS One
https://www.readbyqxmd.com/read/28577139/temporal-comparison-of-global-inventories-of-co2-emissions-from-biomass-burning-during-2002-2011-derived-from-remotely-sensed-data
#5
Yusheng Shi, Tsuneo Matsunaga
Biomass burning is a large important source of greenhouse gases and atmospheric aerosols, and can contribute greatly to the temporal variations of CO2 emissions at regional and global scales. In this study, we compared four globally gridded CO2 emission inventories from biomass burning during the period of 2002-2011, highlighting the similarities and differences in seasonality and interannual variability of the CO2 emissions both at regional and global scales. The four datasets included Global Fire Emissions Database 4s with small fires (GFED4s), Global Fire Assimilation System 1...
June 2, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28570632/quantile-regression-of-microgeographic-variation-in-population-characteristics-of-an-invasive-vertebrate-predator
#6
Shane R Siers, Julie A Savidge, Robert N Reed
Localized ecological conditions have the potential to induce variation in population characteristics such as size distributions and body conditions. The ability to generalize the influence of ecological characteristics on such population traits may be particularly meaningful when those traits influence prospects for successful management interventions. To characterize variability in invasive Brown Treesnake population attributes within and among habitat types, we conducted systematic and seasonally-balanced surveys, collecting 100 snakes from each of 18 sites: three replicates within each of six major habitat types comprising 95% of Guam's geographic expanse...
2017: PloS One
https://www.readbyqxmd.com/read/28567189/polymerase-chain-reaction-identification-of-trypanosoma-brucei-rhodesiense-in-wild-tsetse-flies-from-nkhotakota-wildlife-reserve-malawi
#7
Janelisa Musaya, John Chisi, Edward Senga, Peter Nambala, Emmanuel Maganga, Enock Matovu, John Enyaru
BACKGROUND: Trypanosoma brucei rhodesiense is the causative agent of acute human African trypanosomiasis. Identification of T. b. rhodesiense in tsetse populations is essential for understanding transmission dynamics, assessng human disease risk, and monitoring spatiotemporal trends and impact of control interventions. Accurate detection and characterisation of trypanosomes in vectors relies on molecular techniques. For the first time in Malawi, a molecular technique has been used to detect trypanosomes in tsetse flies in Nkhotakota Wildlife Reserve...
March 2017: Malawi Medical Journal: the Journal of Medical Association of Malawi
https://www.readbyqxmd.com/read/28555627/amazonian-forest-savanna-bistability-and-human-impact
#8
Bert Wuyts, Alan R Champneys, Joanna I House
A bimodal distribution of tropical tree cover at intermediate precipitation levels has been presented as evidence of fire-induced bistability. Here we subdivide satellite vegetation data into those from human-unaffected areas and those from regions close to human-cultivated zones. Bimodality is found to be almost absent in the unaffected regions, whereas it is significantly enhanced close to cultivated zones. Assuming higher logging rates closer to cultivated zones and spatial diffusion of fire, our spatiotemporal mathematical model reproduces these patterns...
May 30, 2017: Nature Communications
https://www.readbyqxmd.com/read/28550727/multiple-remote-sensing-data-sources-to-assess-spatio-temporal-patterns-of-fire-incidence-over-campos-amaz%C3%A3-nicos-savanna-vegetation-enclave-brazilian-amazon
#9
Daniel Borini Alves, Fernando Pérez-Cabello
Fire activity plays an important role in the past, present and future of Earth system behavior. Monitoring and assessing spatial and temporal fire dynamics have a fundamental relevance in the understanding of ecological processes and the human impacts on different landscapes and multiple spatial scales. This work analyzes the spatio-temporal distribution of burned areas in one of the biggest savanna vegetation enclaves in the southern Brazilian Amazon, from 2000 to 2016, deriving information from multiple remote sensing data sources (Landsat and MODIS surface reflectance, TRMM pluviometry and Vegetation Continuous Field tree cover layers)...
May 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28520797/cytogenetic-studies-on-populations-of-camponotus-rufipes-fabricius-1775-and-camponotus-renggeri-emery-1894-formicidae-formicinae
#10
Hilton Jeferson Alves Cardoso de Aguiar, Luísa Antônia Campos Barros, Danúbia Rodrigues Alves, Cléa Dos Santos Ferreira Mariano, Jacques Hubert Charles Delabie, Silvia das Graças Pompolo
Two valid ant species, Camponotus rufipes and Camponotus renggeri, have recently been the subject of a broad discussion with reference to taxa synonymization. Both species are quite common among the Neotropical myrmecofauna and share some unique traits, such as the shape of the scape and the pilosity patterns of the tibiae and scapes. A single morphological trait can help distinguish these species; however, only a combination of different approaches can enlighten our view of the complex phylogenetic relationships prevailing in the different populations of these two taxa...
2017: PloS One
https://www.readbyqxmd.com/read/28500284/hotspot-analyses-indicate-significant-conservation-gaps-for-evergreen-broadleaved-woody-plants-in-china
#11
Yue Xu, Zehao Shen, Lingxiao Ying, Zhiheng Wang, Jihong Huang, Runguo Zang, Youxu Jiang
Evergreen broadleaved woody plants (EBWPs) are dominant components in forests and savanna of the global tropic and subtropic regions. Southern China possesses the largest continuous area of subtropical EBWPs distribution, harboring a high proportion of endemic species. Hotspot and gap analyses are effective methods for analyzing the spatial pattern of biodiversity and conservation and were used here for EBWPs in China. Based on a distribution data set of 6,265 EBWPs with a spatial resolution of 50 × 50 km, we measured diversity of EBWPs in China using four indices: species richness, corrected weighted endemism, relative phylogenetic diversity, and phylogenetic endemism...
May 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28492804/post-fire-reproduction-of-herbs-at-a-savanna-gallery-forest-boundary-in-distrito-federal-brazil
#12
K G Massi, C U O Eugênio, A C Franco
In Cerrado, studies of post-fire vegetation recovery show that some herbaceous species are able to flower shortly after fires. However, these were mainly short-term studies that focused on grasslands and savannas. Little is known about the effects of fire on ground layer of forests that border the savannas in Central Brazil. Thus, an accidental burning gave us the opportunity to describe the reproductive activity of the ground layer vegetation after a fire event along a savanna-forest boundary at the IBGE Ecological Reserve, Brasília, Brazil...
May 4, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28489889/an-environmental-assessment-and-risk-map-of-ascaris-lumbricoides-and-necator-americanus-distributions-in-manufahi-district-timor-leste
#13
Rebecca Wardell, Archie C A Clements, Aparna Lal, David Summers, Stacey Llewellyn, Suzy J Campbell, James McCarthy, Darren J Gray, Susana V Nery
BACKGROUND: In Timor-Leste there have been intermittent and ineffective soil-transmitted helminth (STH) deworming programs since 2004. In a resource-constrained setting, having information on the geographic distribution of STH can aid in prioritising high risk communities for intervention. This study aimed to quantify the environmental risk factors for STH infection and to produce a risk map of STH in Manufahi district, Timor-Leste. METHODOLOGY/PRINCIPAL FINDINGS: Georeferenced cross-sectional data and stool samples were obtained from 2,194 participants in 606 households in 24 villages in the Manufahi District as part of cross sectional surveys done in the context of the "WASH for Worms" randomised controlled trial...
May 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28483041/homo-naledi-and-pleistocene-hominin-evolution-in-subequatorial-africa
#14
Lee R Berger, John Hawks, Paul Hgm Dirks, Marina Elliott, Eric M Roberts
New discoveries and dating of fossil remains from the Rising Star cave system, Cradle of Humankind, South Africa, have strong implications for our understanding of Pleistocene human evolution in Africa. Direct dating of Homo naledi fossils from the Dinaledi Chamber (Berger et al., 2015) shows that they were deposited between about 236 ka and 335 ka (Dirks et al., 2017), placing H. naledi in the later Middle Pleistocene. Hawks and colleagues (Hawks et al., 2017) report the discovery of a second chamber within the Rising Star system (Dirks et al...
May 9, 2017: ELife
https://www.readbyqxmd.com/read/28472113/modelling-seasonal-habitat-suitability-for-wide-ranging-species-invasive-wild-pigs-in-northern-australia
#15
Jens G Froese, Carl S Smith, Peter A Durr, Clive A McAlpine, Rieks D van Klinken
Invasive wildlife often causes serious damage to the economy and agriculture as well as environmental, human and animal health. Habitat models can fill knowledge gaps about species distributions and assist planning to mitigate impacts. Yet, model accuracy and utility may be compromised by small study areas and limited integration of species ecology or temporal variability. Here we modelled seasonal habitat suitability for wild pigs, a widespread and harmful invader, in northern Australia. We developed a resource-based, spatially-explicit and regional-scale approach using Bayesian networks and spatial pattern suitability analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28468601/anticonvulsant-activity-of-caryocar-coriaceum-wittm-fixed-pulp-oil-against-pentylenetetrazol-induced-seizures
#16
Cleide Correia Oliveira, Clarissa Vasconcelos Oliveira, Jéssica Grigoletto, Leandro Rodrigo Ribeiro, Vinícius Rafael Funck, Letícia Meier, Michele Rechia Fighera, Luiz Fernando Freire Royes, Ana Flávia Furian, Irwin Rose Alencar Menezes, Mauro Schneider Oliveira
OBJECTIVES: Epilepsy is a common brain disease and a major worldwide public health problem. The seizures in a significant number of patients suffering from epilepsy remain inadequately controlled by currently available pharmacological treatments. Accordingly, there is a need for the discovery of new anticonvulsant approaches with improved efficacy and a better safety profile. In this context, natural products can be a valuable source of substances with potential anticonvulsant activity...
May 3, 2017: Neurological Research
https://www.readbyqxmd.com/read/28448932/seasonal-changes-of-fructans-in-dimorphic-roots-of-ichthyothere-terminalis-spreng-blake-asteraceae-growing-in-cerrado
#17
Lorrayne Veloso de Almeida, Pedro Henrique Ferri, José Carlos Seraphin, Moemy Gomes de Moraes
Cerrado is a floristically rich savanna in Brazil, whose vegetation consists of a physiognomic mosaic, influenced by rainfall seasonality. In the dry season rainfall is substantially lower and reduces soil water supply, mainly for herbs and subshrubs. Climatic seasonal variations may well define phenological shifts and induce fluctuations of plant reserve pools. Some Cerrado native species have thickened underground organs that bear buds and store reserves, as adaptive features to enable plant survival following environmental stresses...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28434541/phytoliths-indicate-significant-arboreal-cover-at-sahelanthropus-type-locality-tm266-in-northern-chad-and-a-decrease-in-later-sites
#18
Alice Novello, Doris Barboni, Florence Sylvestre, Anne-Elisabeth Lebatard, Christine Paillès, Didier L Bourlès, Andossa Likius, Hassane Taisso Mackaye, Patrick Vignaud, Michel Brunet
We analyzed phytolith and diatom remains preserved at 45 Miocene and Pliocene localities dated between 8 and 1 Ma in northern Chad (16-17°N). Some of these localities yielded cranial remains, lower jaws, and teeth of the hominin species Australopithecus bahrelghazali (∼3.6 Ma) and Sahelanthropus tchadensis (∼7 Ma). Of the 111 sediment samples analyzed, 41 yielded phytoliths, 20 yielded diatoms, and seven yielded both phytoliths and diatoms. Freshwater planktonic and tychoplanktonic diatom species, indicative of lacustrine conditions, are dominant (>91%) in the samples...
May 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28425424/spatial-distribution-of-batrachochytrium-dendrobatidis-in-south-american-caecilians
#19
Carolina Lambertini, C Guilherme Becker, Cecilia Bardier, Domingos da Silva Leite, Luís Felipe Toledo
The amphibian-killing fungus Batrachochytrium dendrobatidis (Bd) is linked to population declines in anurans and salamanders globally. To date, however, few studies have attempted to screen Bd in live caecilians; Bd-positive caecilians have only been reported in Africa and French Guiana. Here, we performed a retrospective survey of museum preserved specimens to (1) describe spatial patterns of Bd infection in Gymnophiona across South America and (2) test whether areas of low climatic suitability for Bd in anurans predict Bd spatial epidemiology in caecilians...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425026/photosynthetic-responses-to-temperature-across-leaf-canopy-ecosystem-scales-a-15-year-study-in-a-californian-oak-grass-savanna
#20
Siyan Ma, Jessica L Osuna, Joseph Verfaillie, Dennis D Baldocchi
Ecosystem CO2 fluxes measured with eddy-covariance techniques provide a new opportunity to retest functional responses of photosynthesis to abiotic factors at the ecosystem level, but examining the effects of one factor (e.g., temperature) on photosynthesis remains a challenge as other factors may confound under circumstances of natural experiments. In this study, we developed a data mining framework to analyze a set of ecosystem CO2 fluxes measured from three eddy-covariance towers, plus a suite of abiotic variables (e...
April 19, 2017: Photosynthesis Research
keyword
keyword
43364
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"