Luis Alberto Longares

• Doctor en Geografía
• Profesor Titular at University of Zaragoza

Dry and warm climate conditions in southern Europe represent clear limits for European beech (Fagus sylvatica) growth near the species southern distribution limit, but it is unclear how aridification and changes in seasonal precipitation regimes will affect these forests at the individual level. We explored climate-growth relationships and the seas...

El mapa geomorfológico de la Bardena Blanca fue elaborado a partir de la información de campo y cartográfica acumulada a lo largo de varios proyectos de investigación sobre la geomorfología de Las Bardenas Reales. El objetivo principal es la representación gráfica de las morfologías existentes, clasificadas y ordenadas cronológicamente siguiendo un...

With ongoing global warming, increasing water deficits promote physiological stress on forest ecosystems with negative impacts on tree growth, vitality, and survival. How individual tree species will react to increased drought stress is therefore a key research question to address for carbon accounting and the development of climate change mitigati...

A new high-resolution climatic gridded dataset was built for Aragón (northeast Spain) using a large collection of daily precipitation and temperature observations from more than 3000 weather stations. The grid covers, at the unprecedented spatial resolution of 0.25 km2, daily maximum and minimum temperatures and precipitation in the 1950–2020 perio...

The future performance of the widely abundant European beech (Fagus sylvatica L.) across its ecological amplitude is uncertain. Although beech is considered drought-sensitive and thus negatively affected by drought events, scientific evidence indicating increasing drought vulnerability under climate change on a cross-regional scale remains elusive....

Los incendios forestales y la aplicación de medidas de restauración forestal, modifica la composición de la vegetación y condiciona su recuperación en función de las estrategias reproductivas de las especies y de la severidad del fuego. Las colecciones históricas de imágenes como Landsat posibilitan la identificación y seguimiento de dichos cambios...

Los ejemplares de Quercus suber (alcornoque) presentes en la provincia de Zaragoza, se desarrollan en su límite ecológico, lejos de los principales núcleos de distribución. Esta característica les otorga una importancia genética reseñable, que pone de manifiesto su necesidad de conservación y desarrollo. Con este como objetivo principal, es necesar...

En este trabajo se analizan los posibles efectos sobre la conectividad ecológica de la red Natura 2000, si se instalasen los parques eólicos ya proyectados en la provincia de Teruel. El estudio se centrará sobre 5 grupos de animales (mamíferos terrestres, aves forestales, esteparias, planeadoras y rapaces). Para ello, se planteó el uso de Linkage M...

The warming of the global climate system is expected to result in significant socioeconomic stress, primarily through the occurrence of extreme weather and climate events, with the potential for severe impacts on societies. This was evidenced by the vulnerability of European nations during the 2003 summer heatwave, which resulted in the death of te...

Most studies on the geomorphological evolution of the Holocene from the Ebro depression (NE Spain) are focused on the period up to the Roman Epoch (218 BC–476 AD) while some references to medieval (476 AD–15th century) deposits are also occasionally dated. This paper focuses on the establishment of aggradation units on the valley bottoms and slopes...

El avance de las tecnologías de análisis espacial y de seguimiento de especies han permitido el aumento del conocimiento en cuanto a biogeografía y el uso del territorio que realizan. Este conocimiento, se hace imprescindible para el diseño de planes de conservación y la gestión del propio territorio. En ese sentido, este trabajo pretende mostrar c...

Bioclim is a software package in R language for bioclimatic classification based on the Type of Bioclimatic Regime approach, which combines climatic and soil properties to classify a region according to its suitability for plant vegetative activity. We present the software's operating modes, capabilities and limitations, including real-world usage...

Triggered by frequent high temperatures and scarce precipitation, droughts are a recurrent phenomenon in the Mediterranean Basin, causing significant impacts on forests. We analyzed the effects of drought intensity, duration, and seasonality on tree growth by investigating the relationship between the Standardized Precipitation-Evapotranspiration I...

En este trabajo se estudia la evolución que ha tenido la caída prematura de las hojas de los árboles (defoliación) en Aragón. Para ello, se cuenta con bases de datos de alta resolución sobre el seguimiento de la defoliación de la Red de Evaluación Fitosanitaria en las Masas Forestales de Aragón (REFMFA). El método que se ha seguido es el de la inte...

RESUMEN: El avance de las tecnologías de seguimiento y análisis espacial de los datos ha permitido incrementar el conocimiento sobre la ecología espacial y el uso del territorio de las especies, siendo una información esencial para la conservación y la toma de decisiones. En el presente trabajo se analiza el comportamiento de individuos de Milano r...

Tree‐ring data has been widely used to inform about tree growth responses to drought at the individual scale, but less is known about how tree growth sensitivity to drought scales up driving changes in forest dynamics. Here, we related tree‐ring growth chronologies and stand‐level forest changes in basal area from two independent data sets to test...

Textural features are widespread in many soils, provide pedogenetic evidence, and are fundamental in soil classification systems. The presence of these features and their conservation over time require certain processes and soil forming factors. This study investigates the genesis of textural pedofeatures, especially clay coatings, and the stressfu...

The growth of past, present, and future forests was, is and will be affected by climate variability. This multifaceted relationship has been assessed in several regional studies, but spatially resolved, large-scale analyses are largely missing so far. Here we estimate recent changes in growth of 5800 beech trees ( Fagus sylvatica L.) from 324 sites...

Understanding the influence of the current climate on the distribution, composition, and carbon storage capacity of Mediterranean tree species is key to determining future pathways under a warmer and drier climate scenario. Here, we evaluated the influence of biotic and environmental factors on earlywood (EW) and latewood (LW) growth in Aleppo pine...

The scarp of Remolinos-Juslibol is an abrupt relief formed by Miocene gypsums located on the left bank of the Ebro River, in the vicinity of the city of Zaragoza. This work provides data for the reconstruction of the channel morphology and dynamics of the Ebro River and its interaction with the gypsum scarp from the Little Ice Age (LIA) to the pres...

This work focuses on the reconstruction of fuelwood procurement during the Mesolithic-Neolithic transition in the southern central Pre-Pyrenees (Spain). The study combines wood charcoal identification with the application of dendro-anthracological approaches in the archaeological sequence of Esplugón (9.4–6.8 kyr cal BP) (Sabiñanigo, Huesca). Scots...

Understanding the regional hydroclimatic variability beyond the instrumental period is essential to contextualize the current climatic period within a longer record. Dendrochronology has been used as a powerful tool for estimating the temperature and precipitation variability of the last centuries on an annual and even seasonal scale. However, most...

The negative impacts of drought on forest growth and productivity last for several years generating legacies, although the factors that determine why such legacies vary across sites and tree species remain unclear. We used an extensive network of tree‐ring width (RWI, ring‐width index) records of 16 tree species from 567 forests, and high‐resolutio...

Se presentala situación actual de la población de avutarda común (Otis tarda) en el sector noroeste de la provincia de Teruel(cuenca de Gallocanta y el valle del Jiloca), analizando los patrones de ocupación anuales y estacionales y su evolución a lo largo del periodo comprendido entre 2001 y 2016, comprobando su posible relación con los cambios de...

En los últimos años en España se ha observado un incremento en el número de practicantes y de lugares donde se realiza la escalada deportiva, siendo Aragón una de las Comunidades Autónomas donde se ha constatado un mayor crecimiento. Dicho aumento se ha producido sin control y en la actualidad no existe, fuera de los Espacios Naturales Protegidos y...

The two most widely extended mountain grasslands in Europe (Nardus-mat grasslands and chalk grasslands) are distributed forming complex patterns. In the Ordesa and Monte Perdido National Park (Central Pyrenees, NE-Spain), they grow as secondary pastures within the treeline ecotone at the subalpine belt. This work aims to show the influence of soil...

The lower Gállego River has been strongly degraded since the 1960s due to human activity (gravel mining, dump accumulation, channeling works), which has produced a deep channel incision. Although these human-driven processes are usually reported in fluvial bibliography, in this case, more complex results are observable. For instance, regarding the...

This study links tree-ring growth and gross primary production for a variety of forest types under different environmental conditions across Spain. NOAA-AVHRR satellite imagery data were combined with dendrochronological records and climate data at a fine spatial resolution (1.21 km2) to analyze the interannual variability of tree-ring growth and v...

Forests exhibit strategies to cope with climate change; however, the rate of the changes on forests can be slower than the actual changes in environmental conditions. Forest management policies, such as assisted migration, may help forests to adapt their species distribution to changing climate conditions. Nonetheless, it certainly requires a bette...

In the past few decades, temperate forests have been negatively altered by numerous anthropogenic activities and by the impact of ongoing climate change. These changes may require management actions to help preserve some forest tree species. In this sense, highly-detailed knowledge of tree growth and survival across territorial and climatic gradien...

La precipitación es una de las variables que presenta mayor incertidumbre en cuanto a sus tendencias temporales. Su elevada variabilidad interanual, especialmente en climas mediterráneos, dificulta el estudio de comportamientos homogéneos en el tiempo. A pesar de que los regímenes de precipitación en España son bien conocidos, el estudio a escala d...

La intensidad y espacialización de los factores climáticos que modelan el crecimiento de los bosques son de suma importancia para el diseño de actividades de gestión forestal. Además, contribuyen positivamente a la toma de decisiones orientadas a la adaptación y mitigación de los efectos del cambio climático sobre los bosques. El objetivo de este e...

Drought is one of the key natural hazards impacting net primary production and tree growth in forest ecosystems. Nonetheless, tree species show different responses to drought events, which make it difficult to adopt fixed tools for monitoring drought impacts under contrasting environmental and climatic conditions. In this study, we assess the respo...

Drought is one of the key natural hazards impacting net primary production and tree growth in forest ecosystems. Nonetheless, tree species show different responses to drought events, which make it difficult to adopt fixed tools for monitoring drought impacts under contrasting environmental and climatic conditions. In this study, we assess the respo...

Drought is one of the key natural hazards impacting net primary production and tree growth in forest ecosystems. Nonetheless, tree species show different responses to drought events, which make it difficult to adopt fixed tools for monitoring drought impacts under contrasting environmental and climatic conditions. In this study, we assess the respo...

Wood formation is the primary biological process through which carbon is durably sequestered in woody plants, and is thus a major contributor to mitigate climate change. We analyzed the tree growth patterns of four conifer species across the Iberian Peninsula (IP) based on a dense dendrochronological network (179 sites) combined with a high resolut...

In landscapes that are extremely sensitive to small environmental changes, like some Mediterranean areas, archaeological contexts could present some problems to their interpretation and evolutionary reconstruction. This is the case of Los Pedregales archaeological site, located in the Hoya de Huesca (NE of Spain), where several stone mounds of unkn...

In this paper we provide a reconstruction of the topography and characteristics of the terrain of Caesar Augusta (the Roman name of the present-day city of Zaragoza). This reconstruction has been modelled using GIS and integrating the topographic map drawn by Casañal in 1880 –previous to the main urban transforma-tions-with geomorphological, geoarc...

Forecasted increase drought frequency and severity may drive worldwide declines in forest productivity. Species-level responses to a drier world are likely to be influenced by their functional traits. Here, we analyse forest resilience to drought using an extensive network of tree-ring width data and satellite imagery. We compiled proxies of forest...

An analysis of the spatial and temporal variability of daily precipitation concentration (CI) in Spain was made based on a high-resolution (5 × 5 km) daily gridded precipitation data set for the 1950–2012 period. For each grid point in the Iberian Peninsula (IP) and Balearic and Canary Islands, the average annual CI was computed, as well as its coe...

Flat-bottomed valleys formed by Holocene fills are the most characteristic landforms in the center of the Ebro basin. This paper analyzes, within a regional framework, a small fluvial basin located in the north of the Alcubierre Range. Three Holocene morphosedimentary units (H1-H3) and a sub-functional level (H4) are identified. These units are rep...

A high-resolution daily gridded precipitation dataset was built from raw data of 12 858 observatories covering a period from 1950 to 2012 in peninsular Spain and 1971 to 2012 in Balearic and Canary islands. The original data were quality-controlled and gaps were filled on each day and location independently. Using the serially complete dataset, a g...

The most important stratified screes of the Iberian Range are found in Sierra de Albarracín. These slope deposits have been traditionally considered, without absolute datings, as having been formed during various Pleistocene cold phases. The aim of this paper is to establish the sedimentological, morphological, chronological, and paleoenvironmental...

A high-resolution daily gridded precipitation dataset was built from raw data of 12,858 observatories covering a period from 1950 to 2012 in peninsular Spain and 1971 to 2012 in Balearic and Canary Islands. The original data were quality controlled and gaps were filled on each day and location independently. Using the serially-complete dataset, a g...

Por lo general, todo abandono de las prácticas agro-ganaderas implica un incremento de la cubierta vegetal en disminución de los ambientes abiertos, en algunos casos provocado por la propia dinámica de la vegetación y en otros favorecido por políticas de reforestación, como ha sido habitual en gran parte de las montañas mediterráneas. El municipio...

Resumen: En el cañón de Calomarde, Sierra de Albarracín, se localiza una de las acumulaciones de derrubios estratificados más importante de la Cordillera Ibérica. Estos depósitos de ladera han sido atribuidos tradicionalmente a periodos fríos del Pleistoceno. En el perfil analizado en este trabajo se han diferenciado cuatro etapas de este tipo de a...

Spanish written communication presented in the Biogeographical Journeys celebrated in Teruel in June 2017. An example of the usage and efficiency of the LANBIOEVA methodology by real areas studied "in situ" using it.

In this paper we report on a compilation of more than 2,200 sites (more than 10,000 individual measurements) where anisotropy of magnetic susceptibility (AMS) was studied in granite from the Variscan Pyrenees. The standardization and homogenization of this information has allowed us to produce three maps that synthesize all the information related...

El conocimiento de la ocupación visigoda y paleoislámica en el valle del Ebro resulta un tanto difuso, más por falta de investigaciones y por la escasa visibilidad de los asentamientos, que por un efectivo despoblamiento. En este artículo presentamos los resultados de nuestras investigaciones en el yacimiento de Los Pedregales, en la provincia de H...

El fin último de este trabajo es la integración de los valores geológicos de las Sierras de Santo Domingo y Salinas dentro de un posible Plan de Ordenación de los Recursos Naturales (PORN), como vector que fomente el desarrollo rural a través del aprovechamiento de los recursos naturales, concretamente el patrimonio geológico, como incentivo turíst...

The growing demand of climate data with an increasing of temporal and spatial resolution requires new regional gridded datasets. Daily precipitation is a key variable to identify extreme events frequency and intensity, and a complete database covering Spain from 1950 to 2012 is useful to know the behaviour of this important climate variable. The me...

The Santo Domingo range is located in the westernmost sector of the southern aragonian Pyrenees and has been recently declared Protected Landscape (Decreto 52/2015, 8 de Abril de 2015, del Gobierno de Aragón). From a geological point of view, it represents the outcrop of the Western Pyrenean sole thrust. The western end of the basal thrust is a lar...

Annual periodicity of cambium production of xylem and phloem cells has rarely been compared in trees from different environments. We compared the structure of cambium and the youngest xylem and phloem increments in four tree species, Fagus sylvatica, Picea abies, Pinus sylvestris and Pinus halepensis, from nine temperate and Mediterranean sites in...

RESUMEN: El índice ND<VI puede relejar un patrón progresivo de creci-miento de la vegetación. Es por ello que podría proporcionar datos fenológi-cos de la vegetación, ya que la fenología sigue repetidos ciclos estacionales. De ahí que en las últimas décadas exista una gran preocupación por el segui-miento de la fenología mediante la teledetección....

Se ha estudiado la distribución actual del galápago europeo (Emys orbicularis) en el Valle del Ebro mediante muestreos dirigidos con diferentes tipologías de nasas, siendo localizado en 39 cuadrículas UTM de 10x10 Km del área de estudio. Estos datos muestran una distribución preferente en las cuencas de los ríos Ebro (sector central), Aragón, Cidac...

The results of the wood charcoal analysis of plant macroremains contained in the walls of the Juslibol (Zaragoza) medieval castle built in Islamic period (tenth century) are presented. Analyzed samples have been recovered in fallen walls. The approach to archaeobotanical record occurs from two perspectives. On the one hand, from a palaeoecological...

Climate predictions for the Mediterranean Basin include increased temperatures, decreased precipitation, and increased frequency of extreme climatic events (ECE). These conditions are associated with decreased tree growth and increased vulnerability to pests and diseases. The anatomy of tree rings responds to these environmental conditions. Quantit...

Resumen: Se presentan los resultados del estudio antracológico de los macrorrestos vegetales contenidos en la muralla del castillo medieval de Juslibol (Zaragoza) construido en época islámica (s. x). Las muestras analizadas han sido recogidas en los paramentos caídos. La aproximación al registro arqueobotánico se produce desde una doble perspectiva...

Wood formation in European beech (Fagus sylvatica L.) and Scots pine (Pinus sylvestris L.) was intra-annually monitored to examine plastic responses of the xylem phenology according to altitude in one of the southernmost areas of their distribution range, i.e., in the Moncayo Natural Park, Spain. The monitoring was done from 2011 to 2013 at 1180 an...

En el presente trabajo se aplica un método global de inventariación y valoración paisajística (LANBIOEVA) centrado en la vegetación como elemento principal de las distintas unidades susceptibles de ser evaluadas. Hasta la fecha, dicho método se ha plasmado en numerosos trabajos aplicados a diversos territorios templados y boreales de Europa y Améri...

En la Península Ibérica existen evidencias perfectamente contrastadas de la existencia de morfologías eólicas. Al sudoeste de la provincia de Valladolid, en una serie de paisajes definidos como de “campiña”, se observan ciertas acumulaciones arenosas que han sido consideradas de origen eólico. El presente trabajo recoge las etapas iniciales de una...

RESUMEN: El presente trabajo muestra el comportamiento de Quercus ilex subsp. ballota (carrasca) tras un incendio y tras ser sometida a diferentes métodos de manejo, como son la poda y la trasmocha. Al mismo tiempo se analiza la evolución de la zona de estudio, situada en el Parque Natural del Moncayo. Se realiza un análisis estadístico de los dato...

Las sequías son un fenómeno recurrente en la cuenca mediterránea con consecuencias negativas para la sociedad, las actividades económicas y los sistemas naturales. Sin embargo, el estudio de las sequías en España se ha limitado hasta ahora al relativamente corto período instrumental. En este trabajo se presenta el potencial de la dendrocronología p...

Conducting biodiversity surveys is expensive and time consuming and we cannot always invest as much time as needed conducting field work. To compensate for such deficiencies, scientists can benefit from advanced techniques of species distribution modelling. Data on species distribution is essential for the correct conservation and management of the...

An interdisciplinary non-invasive research strategy combining the analysis of archival documents, detailed geomorphological mapping, Quaternary stratigraphic studies, analysis of ceramics, and radiocarbon dating was designed to reconstruct the evolution of the Mezimegeer–Juslibol Castle, northeastern Spain. This fortress had great strategic importa...

Present work shows a new methodology to reconstruct complete maximum and minimum temperature series from regressive daily and local models using inherent metadata of climatic data: latitude, longitude and altitude. 66 observatories in whole Moncayo massif have been used from different networks: Spanish Meteorological Agency, Ebro River Basin, and M...

The recent trend of dendroclimatic studies is the use of a greater number of samples of tree growth in order to improve the standardization phase and thereby the conservation of the medium and low frequency signal. This paper presents the first results for the reconstruction of the climate of the Teruel Iberian Range from a great multi-species data...

Resumen: En éste trabajo, se plantea el estudio zoogeográfico del hayedo del Moncayo (Aragón, España), en relación con la situación límite de distribución de dicha formación vegetal. Su comparación con la fauna detectada en diferentes hayedos, permite detectar presencias y ausencias faunísticas significativas, las cuales, indican la situación ecoló...

Research on the European pond turtle (Emys orbicularis), performed during the last decades, provided a large amount of data, which can be used to build ecological niche models (ENMs). One of the commonest problems to make ENMs is the spatial autocorrelation, which artificially inflates measures of accuracy by training‐test data pseudo‐replication....

La Península Ibérica es una importante área de invernada para las aves acuáticas de Europa occidental. Los esfuerzos realizados por las Comunidades Autónomas por conocer el número de individuos que cada año visitan los diferentes humedales peninsulares, se reflejan en un conjunto de censos disponibles desde 1990 y que son recopilados por el Ministe...

Qatar is a small country with desert climate and marine influence where only few studies have been done on reptiles and their distribution. These data are basic for the correct conservation and management of the species and their habitats. In this work we present ecological niche models (ENMs) for four sand-dwelling lizards in Qatar, using as predi...

Moncayo Natural Park represents one of the southern distribution limits for Fagus sylvatica and Pinus sylvestris in Europe. Since the species are distributed along the altitudinal gradient in this mountain, elevation can be used as a factor to obtain additional information about the climategrowth relationships of Fagus sylvatica and Pinus sylvestri...

En todas las poblaciones naturales de aves rapaces existen uni-dades reproductoras (UR) cuya productividad, entendida como pollos vo-lados/año, es baja o nula. Las molestias humanas en las zonas de nidifi-cación han sido una de las causas más relacionadas con el descenso de la productividad de muchas aves rapaces (Richardson y Miller, 1997). Se-gún...

Se presenta un estudio que valora las comunidades faunísticaspresentes en el Aiguabarreig del Segre, Cinca y Ebro desde un punto devista geográfico, considerando su distribución espacial y las relacionesque se establecen entre los distintos ambientes naturales que configuraneste territorio húmedo. A través de la creación de áreas faunísticas apoyad...

La configuración geográfica del territorio turolense y su ubicación dentro del contexto de la Península Ibérica, favorecen la confluencia de numerosos factores del medio natural que muestran aquí sus rasgos más contrastados, así como situaciones de claros gradientes y transiciones. Todo ello da lugar a un territorio variado y por tanto con una impo...

Biodiversity Atlas of animals and plants are very popular in many countries and constitute an essential tool for species management and regional planning. Many coordinate systems and spatial resolutions are used depending on the surface area covered in an Atlas. The 10x10Km resolution is considered standard in other Atlases conducted in geographic...