Archive for September, 2013:

José Ramón Olarieta – The soil factor in the distribution of Mediterranean oak forests in Montsec (Notheastern Spain)

The distribution of Quercus species in the Mediterranean is usually explained on the sole basis of climatic variables, but stands dominated by either Quercus ilex or Q. faginea/Q.cerrioides frequently appear side by side under homogenous climatic conditions. The objective of this paper is to test two hypotheses: the development of ...

Posted in Lecture

Carmen M. Navarro Fernández – Variation of ecto- and arbuscular Mycorrhizas in Quercus spp. under different soil conditions

Mycorrhizas are a mutualistic symbiosis between root plants and soil fungi. They represent key ecological factors governing the cycles of major plant nutrients and have a significant influence on plant health and productivity. Quercus species have the ability to form symbiosis with ecto- and arbuscular mycorrhizal fungi but the latter ...

Posted in Lecture

Carmen M. Padilla Díaz – Influence of climatic conditions on Mast-seeding in two Mediterranean Quercus species

Mast-seeding or masting is the annually variable production of seeds which commonly occurs in many perennial plant species. Although numerous studies have demonstrated the influence of climatic conditions on mast seeding (resource matching hypothesis), there is not a consensus on the identity and the level of species-specificity of the main ...

Posted in Lecture

Tiziana Gentilesca – Forest dieback: a study case of Quercus spp. population in Southern Italy

Stress episodes (Anderegg et al., 2012, Choat et al., 2012, Engelbrecht 2012, Sturrock et al., 2011). The rise and the diffusion of those phenomena, most of them drought-related and heat-induced, appears quietly impressive and alarming. In Italy, isolated phenomena of tree mortality of individual Quercus spp trees were observed; in ...

Posted in Lecture

Jofre Carnicer – Effects of climate change on Quercus species: experimental, observational and synthesis studies

Quercus trees are dominant, late-successional species in the Mediterranean basin and therefore largely influence the observed responses of forests to global change in this region. Here we review the evidence provided by long-term, decadal manipulative experiments simulating the effects of increased drought in Holm oak forests. These experiments mainly suggest dampening negative ...

Posted in Lecture

Miguel A. Zavala – Vulnerability and resilience of Iberian Quercus coping with Global Change: theoretical models and applications

Global Change is one of the main threats for the maintenance of biological diversity and key ecosystem services world-wide. In Spain, land use transformations and climate change are two main drivers of Global Change. Forecasting the future, a drastic decrease in potential forest occupation area is predicted because of climate ...

Posted in Lecture

Carmen Hermida – Environmental influence on the evolution and kinetic properties of Rubisco in Quercus

Rubisco catalyses the fixation of atmospheric CO2 in the form of organic matter. It is hypothesized that Rubisco will have evolved differentially according to the environmental conditions and leaf traits governing internal gas diffusion patterns. Specifically, it is expected that species with sclerophyllous leaves and/or from most xeric and hottest ...

Posted in Lecture

María Valbuena – Genetics of Iberian Quercus: an atypical forest genus

Mating systems constitute the natural mechanisms by which species maintain the genetic variability needed to adapt to environmental conditions along time and space. In plant species, mating systems are characterized by the type of reproduction (asexual or sexual), fertilization process (allogamous or autogamous) and by pollen and seed dispersal mechanisms. ...

Posted in Lecture

Antonio González Rodríguez – Oak genetic diversity in México

The genus Quercus is one of the most important groups of woody plants in Mexico, in terms of species richness, biomass, and ecological and economic value. According to a recent estimate there are about 161 oak species in Mexico, what represents 32-40% of the worldwide total species number. These species ...

Posted in Lecture

Arndt Hampe – Oaks in Southern Europe: from history to ecology

Oaks are key components of Southern European forest systems, and their ecological, societal and economic value for the region can hardly be overstated. Great concern exists that ongoing rapid climate change is likely to overstrain the capacity of oaks and other forest tree species to track suitable climate spaces, potentially ...

Posted in Lecture

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Comparative analysis and synthesis of the patterns of regeneration, decline and distribution of Quercus species
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Proyecto de investigación de excelencia. Consejería de Innovación, Ciencia y Empresa
15 marzo 2011 – 14 marzo 2014