María Elena Fernández

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In NW Patagonia, South America, natural shrublands and mixed forests of short Nothofagus antarctica (G. Forst.) Oerst. trees are currently being replaced by plantations with Pseudotsuga menziesii (Mirb) Franco. This land use change is controversial because the region is prone to drought, and replacement of native vegetation by planted forests may increase(More)
During the last decade, microsatellites (short tandem repeats or STRs) have been successfully used for animal genetic identification, traceability and paternity, although in recent year single nucleotide polymorphisms (SNPs) have been increasingly used for this purpose. An efficient SNP identification system requires a marker set with enough power to(More)
Replacement of grasslands by forests may result in increased water consumption, and the magnitude of this will depend on stand density. To test this hypotheses and evaluate the impact of pine plantations on hydric resources in Patagonia Argentina, we measured over two seasons (1999–2000 and 2000–2001) and at two densities of ponderosa pine plantations (350(More)
A fundamental hypothesis of agroforestry is the complementary use of soil resources. However, productivity of many agroforestry systems has been lower than expected due to net competition for water, highlighting the need for a mechanistic understanding of belowground interactions. The goal of this study was to examine root–root interactions for water in a(More)
The balance between facilitation and competition in plants changes with species characteristics and environmental conditions. Facilitative effects are common in natural ecosystems, particularly in stressful environments or years. Contrarily, in artificial associations of plants, such as agroforestry systems, some authors have suggested that even when(More)
Plants can acclimate to shade through different processes. In particular, they can modify their biomass allocation and the architecture in order to increase light interception. The objective of this study was to evaluate the shade acclimation capacity of Festuca pallescens (St. Ives) Parodi, as part of research concerning the use of this species in(More)
Combination of native pastures with fast-growing tree species (mainly Pinus spp.), may be an interesting economic and environmental alternative for small and medium land-owners in Patagonia,Argentina. Pasture productivity is usually the single most important factor affecting livestock carrying capacity. Therefore the prediction of the effects of tree cover(More)
The physiological capacities of seedlings to cope with drought may be subject to strong selective pressure in the context of future climate scenarios, threatening the regeneration and sustainability of forests. Characterization of the responses and the variability between species is of interest to breeding and domestication programs. In this study, our main(More)
Nothofagus antarctica is the most representative species of the native mixed forest occupying ecotone areas between forests and steppe in NW Patagonia, South-America. In this type of environment, vulnerability to climate change is particularly enhanced. Predictions of future climatic conditions for this region indicate an increment of atmospheric(More)
This study dealt with the effects of pruning on branch and leaf area (F a) production of ponderosa pines growing in silvopastoral systems in Patagonia. We hypothesized that pruning positively influences the number of branches per whorl and their basal area growth rate, changing F a production. In addition, we studied some water relations in order to explain(More)