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Mostrando ítems 531-550 de 564
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Understanding introduction history: Genetic structure and diversity of the edible ectomycorrhizal fungus, Suillus luteus, in Patagonia (Argentina)
(Taylor & Francis, 2021-06)Suillus luteus is a common ectomycorrhizal (EM) fungus associated with several Pinus species. It is distributed throughout the Northern Hemisphere and has been introduced into South America and New Zealand. We examined the ... -
Unintended consequences of planting native and non-native trees in treeless ecosystems to mitigate climate change
(Wiley, 2024-03)Naturally treeless ecosystems are being replaced by native and non-native trees worldwide, often through deliberate afforestation using forestry tree species. By introducing species having novel traits, such as relatively ... -
Unpacking the push-pull system: assessing the contribution of companion crops along a gradient of landscape complexity
(Elsevier, 2018-12)The push-pull system, a stimulo-deterrent cropping strategy consisting of intercropping cereals with herbaceous legumes and surrounded by fodder grasses, is presented as a promising crop diversification strategy for ... -
Unravelling negative interactions between humans, mammalian carnivores and raptors in South America
(Asociación Argentina de Ecología, 2022-08)Human-wildlife interactions can be negative when the needs and behavior of wildlife negatively influence human goals, or vice-versa, and management of these interactions may lead to conflict. Here, we review information ... -
Upstream-Downstream Influence of Water Harvesting Techniques (Jessour) on Soil Water Retention in Southeast Tunisia
(MDPI, 2023-04)Weather parameters and soil moisture profiles were measured at an hourly time step during four agricultural years (September to October, from 2018–19 to 2021–22) in two Jessour (water harvesting cultivated terraces) of the ... -
Urban, periurban and horticultural landscapes – Conflict and sustainable planning in La Plata district, Argentina
(Elsevier, 2022-06)Globally, urban areas are expanding onto high-quality agricultural soils and natural environments reducing the area available for food production. The Horticultural Belt of La Plata is one of the main horticultural areas ... -
Urolitiasis en caprinos del Departamento Empedrado (Corrientes, Argentina)
(Facultad de Ciencias Veterinarias, Universidad Nacional del Nordeste, 2020)La urolitiasis es un trastorno obstructivo total o parcial de las vías urinarias, frecuente en pequeños rumiantes en producción intensiva. En una población de 58 caprinos confinados, se detectaron 8 casos de urolitiasis, ... -
Urolitiasis en pequeños rumiantes
(Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, 2020-06)La urolitiasis es una enfermedad del tracto urinario que afecta a ovinos y caprinos siendo más frecuente en producciones intensivas y semi-intensivas. Clínicamente se caracteriza por depresión, letargia, rechinar de dientes, ... -
Use and management of biodiversity by smallholder farmers in semi-arid West Africa
(Elsevier, 2018-09)Strategies that strengthen and use biodiversity are crucial for sustained food production and livelihoods in semiarid West Africa. The objective of this paper was to examine the role of biodiversity in sustaining diverse ... -
Uso del agua y productividad de los bosques nativos e implantados en el NO de la Patagonia : aproximaciones desde la ecohidrología y la ecofisiología
(2011-12)Existe preocupación por el posible uso excesivo de agua de las forestaciones con especies exóticas de rápido crecimiento en comparación con las especies nativas a las cuales reemplazan en la región NO de la Patagonia. ... -
Uso del compost de biosólidos en la formulación de sustratos para la producción industrial de plantas de Nothofagus alpina = Evaluation of an alternative substrate and a differential nutritional dose on the production and final quality of seedlings of Nothofagus alpina in NW Patagonia
(Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, 2013)Uno de los principales problemas para producir plantas forestales industrialmente es disponer de sustrato de buena calidad en cantidad suficiente. El objetivo de este estudio fue evaluar la factibilidad biológica del uso ... -
Variabilidad de la calidad de lanas en la provincia de Río Negro, Argentina
(Ediciones INTA, 2021-04)En la provincia de Río Negro la producción de lana Merino se realiza en diversas condiciones ambientales. A pesar de esta realidad se desconoce la variabilidad de la calidad de lana a escala regional. El objetivo de este ... -
Variability in seedling emergence traits of Patagonian Cypress marginal steppe populations
(Springer, 2014-01)Genetic information on adaptive traits is crucial for prediction of the evolution of natural populations in relation to global climate change. The seedling emergence process together with germination is a key adaptive stage ... -
Variation in carbon and nitrogen concentrations among peatland categories at the global scale
(PLOS, 2022-11-23)Peatlands account for 15 to 30% of the world’s soil carbon (C) stock and are important controls over global nitrogen (N) cycles. However, C and N concentrations are known to vary among peatlands contributing to the uncertainty ... -
Variation of wood density and hydraulic properties of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) clones related to a heat and drought wave in France
(Elsevier, 2009-01)Drought response of three Douglas-fir clones (slow, intermediate and fast growing) inhabiting two different climatic regimes in France was examined.We used the hydraulic conductivity and the percent loss of conductivity ... -
Vegetation responses to variations in climate: A combined ordinary differential equation and sequential Monte Carlo estimation approach
(Elsevier, 2023-03)Vegetation responses to variation in climate are a current research priority in the context of accelerated shifts generated by climate change. However, the interactions between environmental and biological factors still ... -
Vegetation structure is as important as climate for explaining ecosystem function across Patagonian rangelands
(2014-11)1. Drylands cover about 41% of Earth’s land surface, and 65% of their area supports domestic livestock that depends on the above-ground net primary productivity (ANPP) of natural vegetation. Thus, understanding how biotic ... -
Vegetative propagation of patagonian cypress, a vulnerable species from the subantarctic forest of South America
(Universidad Austral de Chile, 2009)Increasing risks of loosing forest genetic resources and the need for a sustainable quality wood supply make focusing research efforts on undomesticated tree species necessary. The study of their genetic variation in ... -
Vientiocho años de mejoramiento genético en una majada Merino comparada con una testigo sin selección
(Asociación Argentina de Producción Animal, 2016-12)A los fines de demostrar progreso genético se separaron al azar dos majadas, cada una con 250 ovejas y 10 carneros, a partir de una misma población Merino del norte de la Patagonia argentina. La majada “Testigo” se mantuvo ... -
Vitrified embryo transfer in Merino sheep under extensive conditions
(Brazilian College of Animal Reproduction, 2019-06)The aim was to evaluate pregnancy success after transfer of embryos vitrified in micropipette tips in Merino sheep under extensive conditions. A second objective was to evaluate the influence of embryo stage in such pregnancy ...