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Mostrando ítems 540-559 de 562
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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 ... -
Water-mediated changes in plant–plant and biological soil crust–plant interactions in a temperate forest ecosystem
(Copernicus Publications, 2019-04-09)In the quest to understand how biotic interactions respond to climate change, one area that remains poorly explored is how interactions involving organisms other than vascular plants will respond. However the interactions ... -
Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid
(2015-01)Sit and wait predators hunting on flowers are considered to be exploiters of plant–pollinator mutualisms. Several studies have shown that plant–pollinator interactions can be highly susceptible to the impact of a third ... -
What can possibly go wrong? The risks of introducing soil microorganisms from Antarctica into South America = ¿Qué puede salir mal? : Los riesgos de introducir microorganismos del suelo de la Antártida en América del Sur
(2015)Endophytic fungi form mutualistic associations with plant roots which can increase plant survival and resistance to stress. Recently, it has been proposed that endophytic fungi from Antarctica should be used to facilitate ... -
What do domestic livestock eat in northern Patagonian rangelands?
(CSIRO Publishing, 2013-02)The Patagonian rangelands are dominated by steppes interspersed with meadows (locally called mallines), which are small but permanently humid areas, characterised by high spring–summer quality and productivity of grasses ... -
What do we talk about when we talk about Social-Ecological Systems? A Literature Review
(2018-08-20)In the last decade, probably in response to global changes and the environmental crisis, the use of the term “social-ecological system” (SES) in scientific literature has grown. This is certainly a sign that the need and ... -
What is hot in tree rings? The wood density of surviving Douglas-firs to the 2003 drought and heat wave
(Elsevier, 2008-08)In a global warming scenario, drought and heat waves like the one that occurred in 2003 in Europe are expected to become more intense and frequent. This extreme climate event strongly affected the hydraulic balance in many ... -
Where to find structural grade timber: a case study in ponderosa pine based on stand and tree level factors
(Elsevier, 2020-03-01)Using portable acoustic tools, measurements of dynamic modulus of elasticity (Ed) were made in standing ponderosa pine (Pinus ponderosa (Dougl. ex Laws)) trees (n =437) growing in 22 stands encompassing the range of ... -
Why do Pinus species have different growth dominance patterns than Eucalyptus species? A hypothesis based on differential physiological plasticity
(Elsevier, 2011-03-15)It has been observed that Eucalyptus stands show high growth dominance levels while Pinus stands show null or low growth dominance levels. We hypothesized that this differential behaviour is linked to a higher degree of ... -
Wind disrupts trail pheromone communication in the leaf-cutting ant Acromyrmex lobicornis
(Elsevier, 2022-10)Although wind is a ubiquitous component of ecological systems and might affect pheromone communication, its effects have not been studied in depth. To test whether wind impacts trail pheromone behaviour, we studied the ... -
Within-population variability in architectural traits and suitability to forestry conditions in Nothofagus nervosa (= N. alpina; Nothofagaceae)
(2013-07)Context: There is evidence that Nothofagus nervosa (= N. alpina) is suitable for timber production in temperate regions due to its wood quality and fast growth. However, high intra-specific variability in the architectural ... -
Wood density proxies of adaptive traits linked with resistance to drought in Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)
(Springer, 2014-10)A comparison of dead and surviving Douglas fir trees following the 2003 drought was made to define proxies of adaptive traits for resistance to drought. Increment cores were sampled from trees from three French regions: ...