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Selection: Camarero:JJ [9 articles] 

Publications by author Camarero:JJ.

Climate extremes and predicted warming threaten Mediterranean Holocene firs forests refugia

Proceedings of the National Academy of Sciences, Vol. 114, No. 47. (21 November 2017), pp. E10142-E10150,


[Significance] Climate extremes are major drivers of long-term forest growth trends, but we still lack appropriate knowledge to anticipate their effects. Here, we apply a conceptual framework to assess the vulnerability of Circum-Mediterranean Abies refugia in response to climate warming, droughts, and heat waves. Using a tree-ring network and a process-based model, we assess the future vulnerability of Mediterranean Abies forests. Models anticipate abrupt growth reductions for the late 21st century when climatic conditions will be analogous to the most severe dry/heat ...


Silver fir defoliation likelihood is related to negative growth trends and high warming sensitivity at their southernmost distribution limit

ISRN Forestry, Vol. 2012 (2012), pp. 1-8,


Changes in radial growth have been used to estimate tree decline probability since they may indicate tree responses to long- and short-term stressors. We used visual assessments of crown defoliation, an indicator of decline, and retrospective tree-ring analyses to determine whether climate-growth sensitivity and tree growth rates may be used as predictors of tree die-off probability in Abies alba (silver fir) at the Spanish Pyrenees. We used climatic data to calculate standardized temperature and precipitation data and drought indexes. Basal area ...


Distinct effects of climate warming on populations of silver fir (Abies alba) across Europe

Journal of Biogeography, Vol. 42, No. 6. (June 2015), pp. 1150-1162,


[Aim] Climate change is expected to modify growth trends of forests around the world. However, this modification may vary in strength and intensity across a species' biogeographical range. Here, we study European populations of silver fir (Abies alba) across its southern distribution limits in Spain, Italy and Romania. We hypothesized that growth trends of silver fir will differ across its distribution range, with a marked decline in growth in drought-prone regions near the species' southernmost biogeographical limits. [Location] Europe (Spain, Italy, Romania). [Methods] We collected tree-ring ...


Role of geographical provenance in the response of silver fir seedlings to experimental warming and drought

Tree Physiology, Vol. 36, No. 10. (October 2016), pp. 1236-1246,


Changes in climate can alter the distribution and population dynamics of tree species by altering their recruitment patterns, especially at range edges. However, geographical patterns of genetic diversity could buffer the negative consequences of changing climate at rear range edges where populations might also harbour individuals with drought-adapted genotypes. Silver fir ( Abies alba Mill.) reaches its south-western distribution limit in the Spanish Pyrenees, where recent climatic dieback events have disproportionately affected westernmost populations. We hypothesized that silver fir populations from ...


Morphological and ecophysiological variation of the hybrid oak Quercus subpyrenaica (Q. faginea x Q. pubescens)

Trees, Vol. 18, No. 5. (2004), pp. 566-575,


Natural hybridization is common among oaks. We studied the variability of morphological and ecophysiological variables in the hybrid Quercus subpyrenaica and its assumed parental species Q. faginea and Q. pubescens, which co-occur in NE Spain. To assess the fitness of these taxa we studied several ecophysiological variables (hydraulic conductivity, K h; hydraulic specific conductivity, K s; leaf specific conductivity, LSC; water potential corresponding to a 50% loss of conductivity, PLC50; efficiency of light absorption, E a). We performed a correspondence analysis ...


Functional groups in Quercus species derived from the analysis of pressure-volume curves

Trees, Vol. 16, No. 7. (2002), pp. 465-472,


Oaks that occupy Mediterranean phytoclimates share common leaf features (evergreenness, high leaf dry mass per unit area, LMA). Due to this phytoclimatic, morphological, and phenological convergence it has been suggested that they might constitute a coherent functional group. To confirm this hypothesis, some physiological parameters were determined after calculating pressure–volume curves (P–V curves) using the free-transpiration method. Seventeen Quercus species from contrasting phytoclimates were studied: six Mediterranean evergreen species (Q. agrifolia, Q. chrysolepis, Q. coccifera, Q. ilex ssp. ballota, Q. ilex ...


Placing unprecedented recent fir growth in a European-wide and Holocene-long context

Frontiers in Ecology and the Environment, Vol. 12, No. 2. (March 2014), pp. 100-106,


Forest decline played a pivotal role in motivating Europe's political focus on sustainability around 35 years ago. Silver fir (Abies alba) exhibited a particularly severe dieback in the mid-1970s, but disentangling biotic from abiotic drivers remained challenging because both spatial and temporal data were lacking. Here, we analyze 14 136 samples from living trees and historical timbers, together with 356 pollen records, to evaluate recent fir growth from a continent-wide and Holocene-long perspective. Land use and climate change influenced forest growth ...


Uncoupled spatiotemporal patterns of seed dispersal and regeneration in Pyrenean silver fir populations

Forest Ecology and Management, Vol. 319 (May 2014), pp. 18-28,


Silver fir (Abies alba) reaches its southwestern distribution limit (rear edge) in the Pyrenees, where it forms highly fragmented populations threatened by drought-induced die-off. Therefore, we need a better knowledge of regeneration patterns and processes (seed production and dispersal, regeneration niche) of such rear-edge stands to assist their long-term conservation. Seed rain patterns were studied in two structurally contrasting sites: an even-aged pure stand (Las Eras) and an uneven-aged mixed silver fir-beech (Fagus sylvatica) stand (Gamueta) over 8 and 12 years, ...


Increasing Aridity is Enhancing Silver Fir Abies Alba Mill.) Water Stress in its South-Western Distribution Limit

Climatic Change, Vol. 79, No. 3. (1 December 2006), pp. 289-313,


Tree populations located at the geographical distribution limit of the species may provide valuable information about the response of tree growth to climate warming across climatic gradients. Dendroclimatic information was extracted from a network of 10 silver-fir ( Abies alba ) populations in the south-western distribution limit of the species (Pyrenees, NE Iberian Peninsula). Ring-width chronologies were built for five stands sampled in mesic sites from the Main Range in the Pyrenees, and for five forests located in the southern Peripheral ...

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