Nuestros investigadores

Ricardo Ibáñez Gastón

Departamento
Biología Ambiental
Facultad de Ciencias. Universidad de Navarra
Líneas de investigación
Ecología y dinámica de comunidades vegetales, Restauración de espacios degradados, Ecología de poblaciones vegetales

Publicaciones científicas más recientes (desde 2010)

Autores: Camarero Martínez, J. J.; Gazol, Antonio; Sangüesa Barreda, G.; et al.
Revista: FRONTIERS IN ECOLOGY AND EVOLUTION
ISSN 2296-701X  Vol. 6  2018  págs. 9
Drought-triggered declines in forest productivity and associated die-off events have increased considerably due to climate warming in the last decades. There is an increasing interest in quantifying the resilience capacity of forests against climate warming and drought to uncover how different stands and tree species will resist and recover after more frequent and intense droughts. Trees form annual growth rings that represent an accurate record of how forest growth responded to past droughts. Here we use dendrochronology to quantify the radial growth of different forests subjected to contrasting climatic conditions in Spain during the last half century. Particularly, we considered four climatically contrasting areas where dominant forests showed clear signs of drought-induced dieback. Studied forests included wet sites dominated by silver fir (Abies alba) in the Pyrenees and beech (Fagus sylvatica) stands in northern Spain, and drought-prone sites dominated by Scots pine (Pinus sylvestris) in eastern Spain and black pine (Pinus nigra) in the semi-arid south-eastern Spain. We quantified the growth reduction caused by different droughts and assessed the short-and long-term resilience capacity of declining vs. non-declining trees in each forest. In all cases, drought induced a marked growth reduction regardless tree vigor. However, the capacity to recover after drought (resilience) at short- and long-term scales varied greatly between declining and non-declining individuals. ..
Autores: Gazol, Antonio; Uría, Jaime; Elustondo, David; et al.
Revista: JOURNAL OF VEGETATION SCIENCE
ISSN 1100-9233  Vol. 27  Nº 4  2016  págs. 728 - 738
Autores: Uría, Jaime; Gazol Burgos, A.; Ibáñez, R;
Revista: AMERICAN JOURNAL OF BOTANY
ISSN 0002-9122  Vol. 101  Nº 8  2014  págs. 1286 - 1292
Premise of the study: Plants respond to the prevailing conditions in the surrounding environment, but since they are dynamic systems this response may vary during their life. Thus, the identification of key aspects for the maintenance of plant populations requires the consideration of plant performance across environmental gradients and along life stages. This study examines how abiotic conditions and biotic interactions and processes determine the spatial distribution of two life-story stages that play a key role in the functioning of a representative population of Carex remota. Methods: We used structural equation modeling (SEM) to test for direct and indirect influences of abiotic and biotic factors on seedlings and adults of Carex remota. The variables used in the analysis were number of seedlings, cover of adults, soil moisture, leaf litter cover, relative light, and topographic position. Key results: Population patterns partially depend on direct and indirect effects of abiotic conditions. Whereas adult individuals were only affected by topsoil moisture, seedling emergence was largely affected by multiple environmental conditions. The number of seedlings increased with high topsoil moisture, low leaf-litter values, high light values as well as in low parts of the study area. The importance of adult individuals in determining seedling success is also highlighted: higher abundance provides seed rain in the surroundings and modifies the microenvironmental conditions favoring high seedling establishment. Conclusions: As hypothesized, adults and seedlings responded to the environmental conditions differently. Seedling emergence was a critical aspect in C. remota performance, and abrupt changes in the environment during this stage may strongly influence population performance.
Autores: Uría, Jaime; Ibáñez, R;
Revista: ECOHYDROLOGY
ISSN 1936-0584  Vol. 7  Nº 2  2014  págs. 524 - 531
This work explains the effect of microtopography on the spatio-temporal gradient of topsoil moisture in a first-order stream in a forested mountainous area of northern Spain. This gradient was also related with the availability of suitable microsites for a forest riparian sedge (Carex remota). Topsoil moisture, presence of C. remota and height and distance from the stream edges were measured in 385 points along 35 transects perpendicular to the stream. Soil moisture measurements were repeated in three different dates. Topsoil moisture showed a sigmoid trend that defined the limits of a wet riparian zone at 125m of distance from and 055m in elevation above stream banks. Our riparian zone was narrower than other studies because of the steep slopes (25%) of the mountainous area studied. Elevation above stream banks was more influential than distance in defining the limits of the riparian zone. In the riparian zone, values of soil moisture were high and constant even at the end of a dry period due to the continuous water flow. In the adjacent upland forest, soil moisture varied according to rainfall. These high and constant soil moisture values defined the suitable microsites for C. remota.
Autores: Ibáñez, R;
Revista: BOLETÍN DE LA ASOCIACIÓN DE HERBARIOS IBERO-MACARONÉSICOS
ISSN 1136-5048  Vol. 14 - 15  2013  págs. 54
Autores: Herrero, C.; Uría, Jaime; Ibáñez, R; et al.
Revista: REPORTS OF THE FINNISH ENVIRONMENT INSTITUTE
ISSN 1796-1718  Vol. 25  2013  págs. 47 - 50
Autores: Uría, Jaime; Ibáñez, R; Mateu, J;
Revista: STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
ISSN 1436-3240  Vol. 27  Nº 1  2013  págs. 59-76
This study attempts to understand the dependence on abiotic factors and on the biotic process of the population development. We used three spatial point process models (Poisson, Area-Interaction and shot-noise Cox processes) in both homogenous and inhomogeneous versions to model the distribution of three Carex remota cohorts in wet zones of a temperate forest in the north of Spain. The cohorts studied were adults and seedlings born in two consecutive years. With the use of these models we are able to simulate separately and jointly the effect on plant distribution of a homogeneous or heterogeneous habitat, and the absence or presence of some biotic processes, as seed dispersal and/or density-dependent interactions. The result of the bivariate function analysis does not reveal sufficient evidences, but suggests a weak positive relation between adults and seedlings that survived a dry period in the first summer. Models from the three cohorts show a decreasing degree of clustering from seedlings to adults. Besides, the results show that the importance of the main factors that explain the population structure changes along the development of Carex stages. Compared to seedlings, the adults pattern shows an increasing dependence on abiotic factors.
Autores: Ariño, A.H.; Ibáñez, R; et al.
Revista: THE FINNISH ENVIRONMENT
ISSN 1238-7312  Nº 18  2011  págs. 53 - 57
Autores: Gazol, Antonio; Ibáñez, R;
Revista: Plant Ecology (Print)
ISSN 1385-0237  Vol. 207  Nº 1  2010  págs. 1 - 11
Spatial patterns of vascular plant diversity were studied in an unmanaged temperate forest in northern Spain. Diversity in 102 plots of 400 m(2) was analyzed against environmental and spatial variables. The Principal Coordinates of Neighbor Matrices method was used to create spatial variables that represent spatial structures on multiple scales. Variation partitioning on multiple regression was used to discover pure environmental and spatial fractions and their joint effects on diversity. Additionally, we created maps of the response and some explanatory variables to interpret their patterns. The results show that diversity is heterogeneously distributed in the basin and is explained mainly by environmental factors. Leaf litter cover proved the most important environmental factor. The spatial variables play an important role in structuring the environment but the low amount of variance explained by these when the effect of the environment is removed points to the lesser importance of neighborhood relations to the distribution of diversity values.
Autores: Gazol, A.; Ibáñez, R;
Revista: Acta Oecologica
ISSN 1146-609X  Vol. 36  Nº 6  2010  págs. 634 - 644
Autores: Gazol, Antonio; Ibáñez, R;
Revista: Plant Ecology (Print)
ISSN 1385-0237  Vol. 211  Nº 1  2010  págs. 37 - 48
Autores: Ariño, A.H.; Gimeno, Benjamín S.; Pérez de Zabalza, A.; et al.
Libro:  Nitrogen Deposition and Natura 2000: Science & Practice in determining environmental impacts
2011  págs. 140 - 146

ACTIVIDAD DOCENTE