keyword
MENU ▼
Read by QxMD icon Read
search

Savanna

keyword
https://www.readbyqxmd.com/read/29328512/economy-of-scale-third-partner-strengthens-a-keystone-ant-plant-mutualism
#1
Kirsten M Prior, Todd M Palmer
While foundation species can stabilize ecosystems at landscape scales, their ability to persist is often underlain by keystone interactions occurring at smaller scales. Acacia drepanolobium is a foundation tree, comprising >95% of woody cover in East African black-cotton savanna ecosystems. Its dominance is underlain by a keystone mutualistic interaction with several symbiotic ant species in which it provides housing (swollen thorns) and carbohydrate-rich nectar from extra-floral nectaries (EFN). In return, it gains protection from catastrophic damage from mega-herbivores...
January 12, 2018: Ecology
https://www.readbyqxmd.com/read/29323781/soil-phosphorus-does-not-keep-pace-with-soil-carbon-and-nitrogen-accumulation-following-woody-encroachment
#2
Yong Zhou, Thomas W Boutton, X Ben Wu
Soil carbon, nitrogen, and phosphorus cycles are strongly interlinked and controlled through biological processes, and the phosphorus cycle is further controlled through geochemical processes. In dryland ecosystems, woody encroachment often modifies soil carbon, nitrogen, and phosphorus stores, although it remains unknown if these three elements change proportionally in response to this vegetation change. We evaluated proportional changes and spatial patterns of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) concentrations following woody encroachment by taking spatially-explicit soil cores to a depth of 1...
January 11, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29315603/on-the-relationship-between-fire-regime-and-vegetation-structure-in-the-tropics
#3
Elmar M Veenendaal, Mireia Torello-Raventos, Heloisa S Miranda, Naomi Margarete Sato, Imma Oliveras, Frank van Langevelde, Gregory P Asner, Jon Lloyd
We assessed data from 11 experiments examining the effects of the timing and/or frequency of fire on tropical forest and/or savanna vegetation structure over one decade or more. The initial 'control treatment' in many such cases consisted of previously cleared land. This is as opposed to natural vegetation subject to some sort of endogenous fire regime before the imposition of fire treatments. Effects of fire on fractional foliar cover are up to 10-fold greater when clearing pre-treatments are imposed. Moreover, because many of the 'classic' fire trials were initialised with applied management questions in mind, most have also used burning regimes much more frequent and/or severe than those occurring in the absence of human activity...
January 7, 2018: New Phytologist
https://www.readbyqxmd.com/read/29310700/a-cross-sectional-study-of-the-filarial-and-leishmania-co-endemicity-in-two-ecologically-distinct-settings-in-mali
#4
Moussa Brema Sangare, Yaya Ibrahim Coulibaly, Siaka Yamoussa Coulibaly, Michel Emmanuel Coulibaly, Bourama Traore, Ilo Dicko, Ibrahim Moussa Sissoko, Sibiry Samake, Sekou Fantamady Traore, Thomas Bruce Nutman, Jesus Gilberto Valenzuela, Ousmane Faye, Shaden Kamhawi, Fabiano Oliveira, Roshanak Tolouei Semnani, Seydou Doumbia
BACKGROUND: Filariasis and leishmaniasis are two neglected tropical diseases in Mali. Due to distribution and associated clinical features, both diseases are of concern to public health. The goal of this study was to determine the prevalence of co-infection with filarial (Wuchereria bancrofti and Mansonella perstans) and Leishmania major parasites in two ecologically distinct areas of Mali, the Kolokani district (villages of Tieneguebougou and Bougoudiana) in North Sudan Savanna area, and the district of Kolondieba (village of Boundioba) in the South Sudan Savanna area...
January 8, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29307104/tiger-moths-in-savannas-in-eastern-amazon-first-assessment-of-diversity-and-seasonal-aspects
#5
D M P Valente, M M Zenker, J A Teston
Biodiversity knowledge on insects is urgently needed due to the ever growing demand for food and the consequent deforestation process and loss of natural habitats in many understudied tropical regions. In this paper, we describe the outcome of a biodiversity research on tiger moths performed for the first time in a poorly studied Amazonian landscape-the savanna. We sampled tiger moths monthly with UV automatic light traps for 12 consecutive months in two sampling points in an area of savanna in eastern Amazon, and we compared our results to previously available data for eastern Amazon...
January 6, 2018: Neotropical Entomology
https://www.readbyqxmd.com/read/29299261/disturbance-modulated-symbioses-in-termitophily
#6
Ivan Monteiro, Arleu Barbosa Viana-Junior, Ricardo Ribeiro de Castro Solar, Frederico de Siqueira Neves, Og DeSouza
Symbiosis, the living-together of unlike organisms, underlies every major transition in evolution and pervades most ecological dynamics. Among examples of symbioses, the simultaneous occupation of a termite nest by its builder termites and intruding invertebrate species (so-called termitophily) provides suitable macroscopic scenarios for the study of species coexistence in confined environments. Current evidence on termitophily abounds for dynamics occurring at the interindividual level within the termitarium, but is insufficient for broader scales such as the community and the landscape...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29284748/aridity-weakens-population-level-effects-of-multiple-species-interactions-on-hibiscus-meyeri
#7
Allison M Louthan, Robert M Pringle, Jacob R Goheen, Todd M Palmer, William F Morris, Daniel F Doak
Predicting how species' abundances and ranges will shift in response to climate change requires a mechanistic understanding of how multiple factors interact to limit population growth. Both abiotic stress and species interactions can limit populations and potentially set range boundaries, but we have a poor understanding of when and where each is most critical. A commonly cited hypothesis, first proposed by Darwin, posits that abiotic factors (e.g., temperature, precipitation) are stronger determinants of range boundaries in apparently abiotically stressful areas ("stress" indicates abiotic factors that reduce population growth), including desert, polar, or high-elevation environments, whereas species interactions (e...
December 28, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29282580/savanna-chimpanzee-pan-troglodytes-verus-nesting-ecology-at-bagnomba-kedougou-senegal
#8
REVIEW
L Badji, P I Ndiaye, S M Lindshield, C T Ba, J D Pruetz
We studied the nesting behavior of the critically endangered West African chimpanzee (Pan troglodytes verus). We assumed that the nesting data stemmed from a single, unhabituated community at the Bagnomba hill site in the savanna-woodlands of southeastern Senegal. The aim of this study was to examine chimpanzees' nesting habits in terms of the tree species utilized and sleeping nest heights. We recorded a total of 550 chimpanzee nests at Bagnomba between January 2015 and December 2015. The chimpanzees here made nests in particular tree species more often than others...
December 27, 2017: Primates; Journal of Primatology
https://www.readbyqxmd.com/read/29279603/history-of-the-fragmentation-of-the-african-rain-forest-in-the-dahomey-gap-insight-from-the-demographic-history-of-terminalia-superba
#9
Boris B Demenou, Jean-Louis Doucet, Olivier J Hardy
Paleo-environmental reconstructions show that the distribution of tropical African rain forests was affected by Quaternary climate changes. They suggest that the Dahomey Gap (DG)-the savanna corridor that currently separates Upper Guinean (UG, West Africa) and Lower Guinean (LG, western Central Africa) rain forest blocks-was forested during the African Humid Holocene period (from at least 9 ka till 4.5 ka), and possibly during other interglacial periods, while an open vegetation developed in the DG under drier conditions, notably during glacial maxima...
December 27, 2017: Heredity
https://www.readbyqxmd.com/read/29247290/indirect-effects-of-mutualism-ant-treehopper-associations-deter-pollinators-and-reduce-reproduction-in-a-tropical-shrub
#10
Javier Ibarra-Isassi, Paulo S Oliveira
Animal-pollinated plants can be susceptible to changes in pollinator availability. Honeydew-producing treehoppers frequently occur on inflorescences, potentially enhancing ant-mediated negative effects on pollination services. However, the effect of ant-attended, honeydew-producing insects on plant reproduction remains uncertain. We recorded the abundance of treehoppers and ants on Byrsonima intermedia (Malpighiaceae), and monitored floral visitors in a Brazilian cerrado savanna. We manipulated the presence of ants and ant-treehopper associations on inflorescences to assess their effect on pollination and fruit formation...
December 15, 2017: Oecologia
https://www.readbyqxmd.com/read/29238538/strong-positive-effects-of-termites-on-savanna-bird-abundance-and-diversity-are-amplified-by-large-herbivore-exclusion
#11
Stein R Moe, Katrine Eldegard, Ole Tobias Rannestad, Paul Okullo, Ommund Lindtjørn, Ole Gunnar Støen, Svein Dale
Vast areas of the African savanna landscapes are characterized by tree-covered Macrotermes termite mounds embedded within a relatively open savanna matrix. In concert with termites, large herbivores are important determinants of savanna woody vegetation cover. The relative cover of woody species has considerable effects on savanna function. Despite the potentially important ecological relationships between termite mounds, woody plants, large herbivores, and birds, these associations have previously received surprisingly little attention...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29230921/global-grass-poaceae-success-underpinned-by-traits-facilitating-colonization-persistence-and-habitat-transformation
#12
H P Linder, Caroline E R Lehmann, Sally Archibald, Colin P Osborne, David M Richardson
Poaceae (the grasses) is arguably the most successful plant family, in terms of its global occurrence in (almost) all ecosystems with angiosperms, its ecological dominance in many ecosystems, and high species richness. We suggest that the success of grasses is best understood in context of their capacity to colonize, persist, and transform environments (the "Viking syndrome"). This results from combining effective long-distance dispersal, efficacious establishment biology, ecological flexibility, resilience to disturbance and the capacity to modify environments by changing the nature of fire and mammalian herbivory...
December 12, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/29228053/traditional-scientific-data-vs-uncoordinated-citizen-science-effort-a-review-of-the-current-status-and-comparison-of-data-on-avifauna-in-southern-brazil
#13
Louri Klemann-Junior, Marcelo Alejandro Villegas Vallejos, Pedro Scherer-Neto, Jean Ricardo Simões Vitule
Data generated by citizen science is particularly valuable in ecological research. If used discerningly with data from traditional scientific references, citizen science can directly contribute to biogeography knowledge and conservation policies by increasing the number of species records in large geographic areas. Considering the current level of knowledge on south Brazilian avifauna, the large volume of data produced by uncoordinated citizen science effort (CS), and the growing need for information on changes in abundance and species composition, we have compiled an updated, general list of bird species occurrence within the state of Paraná...
2017: PloS One
https://www.readbyqxmd.com/read/29227988/fire-frequency-drives-decadal-changes-in-soil-carbon-and-nitrogen-and-ecosystem-productivity
#14
Adam F A Pellegrini, Anders Ahlström, Sarah E Hobbie, Peter B Reich, Lars P Nieradzik, A Carla Staver, Bryant C Scharenbroch, Ari Jumpponen, William R L Anderegg, James T Randerson, Robert B Jackson
Fire frequency is changing globally and is projected to affect the global carbon cycle and climate. However, uncertainty about how ecosystems respond to decadal changes in fire frequency makes it difficult to predict the effects of altered fire regimes on the carbon cycle; for instance, we do not fully understand the long-term effects of fire on soil carbon and nutrient storage, or whether fire-driven nutrient losses limit plant productivity. Here we analyse data from 48 sites in savanna grasslands, broadleaf forests and needleleaf forests spanning up to 65 years, during which time the frequency of fires was altered at each site...
December 11, 2017: Nature
https://www.readbyqxmd.com/read/29227140/range-expansion-of-the-economically-important-asiatic-blue-tick-i-rhipicephalus-microplus-i-in-south-africa
#15
Nkululeko Nyangiwe, Ivan G Horak, Luther Van der Mescht, Sonja Matthee
The Asiatic blue tick, Rhipicephalus microplus, a known vector of bovine babesiosis and bovine anaplasmosis, is of great concern in the cattle industry. For this reason, detailed knowledge of the distribution of R. microplus is vital. Currently, R. microplus is believed to be associated mainly with the northern and eastern Savanna and Grassland vegetation in South Africa. The objective of the study was to record the distribution of R. microplus, and the related endemic Rhipicephalus decoloratus, in the central-western region of South Africa that comprises Albany Thicket, Fynbos and Savanna vegetation...
December 8, 2017: Journal of the South African Veterinary Association
https://www.readbyqxmd.com/read/29224118/testing-the-hypothesis-of-hierarchical-predictability-in-ecological-restoration-and-succession
#16
Scott R Abella, Timothy A Schetter, Timothy L Walters
To advance predictive ecology, the hypothesis of hierarchical predictability proposes that community measures for which species are interchangeable (e.g., structure and species richness) are more predictable than measures for which species identity matters (e.g., community composition). Predictability is hypothesized to decrease for response measures in order of the following categories: structure, species richness, function, and species composition. We tested this hypothesis using a 14-year, oak savanna-prairie restoration experiment that removed non-native pine plantations at 24 sites in northwestern Ohio, USA...
December 9, 2017: Oecologia
https://www.readbyqxmd.com/read/29214366/two-new-sporothrix-species-from-protea-flower-heads-in-south-african-grassland-and-savanna
#17
Nombuso P Ngubane, Leanne L Dreyer, Kenneth C Oberlander, Francois Roets
The inflorescences and infructescences of African Protea trees provide habitat for a large diversity of Sporothrix species. Here we describe two additional members, Sporothrix nsini sp. nov. and Sporothrix smangaliso sp. nov., that are associated with the infructescences of various Protea species from grasslands and savannas in the KwaZulu-Natal, North-West, Gauteng and Mpumalanga provinces of South Africa. Their description raises the number of described Protea-associated Sporothrix species to twelve. S. smangaliso sp...
December 6, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29178445/pleistocene-climatic-changes-drive-diversification-across-a-tropical-savanna
#18
Sally Potter, Alexander T Xue, Jason G Bragg, Dan F Rosauer, Emily J Roycroft, Craig Moritz
Spatial responses of species to past climate change depend on both intrinsic traits (climatic niche breadth, dispersal rates) and the scale of climatic fluctuations across the landscape. New capabilities in generating and analysing population genomic data, along with spatial modelling, have unleashed our capacity to infer how past climate changes have shaped populations, and by extension, complex communities. Combining these approaches, we uncover lineage diversity across four co-distributed lizards from the Australian Monsoonal Tropics and explore how varying climatic tolerances interact with regional climate history to generate common versus disparate responses to late Pleistocene change...
November 25, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29168617/carnivore-stable-carbon-isotope-niches-reflect-predator-prey-size-relationships-in-african-savannas
#19
Jacqueline Codron, Nico L Avenant, Corli Wigley-Coetsee, Daryl Codron
Predator-prey size relationships are among the most important patterns underlying the structure and function of ecological communities. Indeed, these relationships have already been shown to be important for understanding patterns of macroevolution and differential extinction in the terrestrial vertebrate fossil record. Stable isotope analysis (SIA) is a powerful remote approach to examining animal diets and palaeodiets. The approach is based on the principle that isotope compositions of consumer tissues reflect those of their prey...
November 23, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/29168603/eye-gaze-perception-in-bipolar-disorder-self-referential-bias-but-intact-perceptual-sensitivity
#20
Beier Yao, Savanna A Mueller, Tyler B Grove, Merranda McLaughlin, Katharine Thakkar, Vicki Ellingrod, Melvin G McInnis, Stephan F Taylor, Patricia J Deldin, Ivy F Tso
OBJECTIVES: Deficits in social cognition predict poor functional outcome in severe mental illnesses such as schizophrenia and autism. However, research findings on social cognition in bipolar disorder (BD) are sparse and inconsistent. This study aimed to characterize a critical social cognitive process-eye gaze perception-and examine its functional correlates in BD to inform psychopathological mechanisms. METHODS: Thirty participants with BD, 37 healthy controls (HC), and 46 psychiatric controls with schizophrenia (SZ) completed an eye-contact perception task...
November 23, 2017: Bipolar Disorders
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"