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Digital.CSIC (162.855 recursos)

Repositorio institucional del Consejo Superior de Investigaciones Científicas. Digital.CSIC es un depósito de documentos digitales, cuyo objetivo es organizar, archivar, preservar y difundir en modo de acceso abierto la producción intelectual resultante de la actividad investigadora del CSIC.

(IPE) Artículos post-print

Mostrando recursos 1 - 20 de 25

  1. Sediment delivery and lake dynamics in a Mediterranean mountain watershed: Human-climate interactions during the last millennium (El Tobar Lake record, Iberian Range, Spain)

    Barreiro-Lostres, Fernando; Brown, Eric; Moreno Caballud, Ana; Morellón, Mario; Abbott, Mark B.; Hillman, Aubrey L.; Giralt, Santiago; Valero-Garcés, Blas L.
    Land degradation and soil erosion are key environmental problems in Mediterranean mountains characterized by a long history of human occupation and a strong variability of hydrological regimes. To assess recent trends and evaluate climatic and anthropogenic impacts in these highly human modified watersheds we apply an historical approach combining lake sediment core multi-proxy analyses and reconstructions of past land uses to El Tobar Lake watershed, located in the Iberian Range (Central Spain). Four main periods of increased sediment delivery have been identified in the 8 m long sediment sequence by their depositional and geochemical signatures. They took place around 16th,...

  2. Responses of medium- and large-sized bird diversity to irrigation in dry cereal agroecosystems across spatial scales

    Frutos Tena, Ángel de; Olea, Pedro P.; Mateo-Tomás, Patricia
    Conserving biological diversity under agriculture intensification is a global challenge given that the intensification process erodes biodiversity worldwide. Recently, efforts have begun to move towards conserving biodiversity in intensified farmland ecosystems, but there is little understanding of how some kinds of intensification (e.g., irrigation) affect biodiversity. We aimed to assess the responses of farmland bird diversity along an agricultural intensification gradient from dry to irrigation across spatial scales. We covered 10-km-survey transects by car to census medium- and large-sized farmland birds through a decreasing gradient of agricultural intensification ranging from irrigated to dry cereal farming systems in North-western Spain. We...

  3. Quantitative climate reconstruction linking meteorological, limnological and XRF core scanner datasets: the Lake Sanabria case study, NW Spain

    Giralt, Santiago; Rico, María Teresa; Vega, J. C.; Valero-Garcés, Blas L.
    16 páginas, 11 figuras, 1 tabla.-- Fecha de publicación online.

  4. Relationship of runoff, erosion and sediment yield to weather types in the Iberian Peninsula

    Nadal-Romero, Estela; Lasanta Martínez, Teodoro; Gómez Calero, José Alfonso

  5. Comment on "Climate in the Western Cordillera of the Central Andes over the last 4300 years", by Engel etal. (2014)

    Sáez, Alberto; Giralt, Santiago; Hernández, Armand; Bao, Roberto; Pueyo Mur, Juan José; Moreno Caballud, Ana; Valero-Garcés, Blas L.
    Peer Reviewed

  6. Conservationists, hunters and farmers: The European rabbit Oryctolagus cuniculus management conflict in the Iberian Peninsula

    Delibes-Mateos, Miguel; Ferreira, Catarina; Rouco, Carlos; Villafuerte, Rafael; Barrio, Isabel C.
    Biodiversity conflicts arise when the interests of different stakeholders over common resources compete. Typically, the more parties involved, the more complex situations become. Resolution of biodiversity conflicts requires an understanding of the ecological, social and economic factors involved, in other words the interests and priorities of each stakeholder. However, in most biodiversity conflicts, many of these components remain poorly understood. As a case study, we analyse the conflict involving conservationists, hunters and farmers in the management of a native lagomorph, the European rabbit Oryctolagus cuniculus, in the Iberian Peninsula. We review the socio-economic context of the rabbit management conflict, investigating...

  7. The influence of subaquatic springs in lacustrine sedimentation: Origin and paleoenvironmental significance of homogenites in karstic Lake Banyoles (NE Spain)

    Morellón, Mario; Anselmetti, Flavio; Valero-Garcés, Blas L.; Giralt, Santiago; Ariztegui, Daniel; Sáez, Alberto; Mata, M. Pilar; Barreiro-Lostres, Fernando; Rico, María Teresa; Moreno Caballud, Ana
    Banyoles (42°08'N, 2°45'E) is the largest and deepest lake of karstic-tectonic origin in the Iberian Peninsula. The lake comprises two basins and six sub-circularly shaped sub-basins fed by subaquatic springs. Periods of intense groundwater inflow in the deepest sub-basins lead to the fluidization and re-suspension of previously deposited sediments and subsequent settling forming homogenite deposits on the southern basin intermediate platforms. The multiproxy analysis of sediment cores combined with high resolution seismic stratigraphy (3.5kHz pinger and multi-frequency Chirp surveys) allows a precise reconstruction of depositional environments and related hydrological variability and groundwater inflow during the last ca. 7.6cal kyr BP....

  8. Climate, paleohydrology and land use change in the Central Iberian Range over the last 1.6 ka: The La Parra Lake record

    Barreiro-Lostres, Fernando; Moreno Caballud, Ana; Giralt, Santiago; Caballero-Miranda, M.; Valero-Garcés, Blas L.
    A multiproxy study of a 7 m long sedimentary sequence from Lake La Parra (39°50.948′, 1°52′, 1014 m a.s.l.) supported by 11 14C AMS and 210Pb/137Cs dates provides a robust, high-resolution hydrological and environmental variability record for the last 1600 years of the Las Torcas sinkhole Complex in the Central Iberian Range. The succession of depositional environments in Lake La Parra sinkhole is controlled by both changes in the regional water table and by the balance between sedimentary input through ephemeral creeks and in-lake production of carbonates and organic matter. Although synergetic links with climate are likely, phases of increased sediment delivery...

  9. Habitat selection and diet of Western Capercaillie Tetrao urogallus in an atypical biogeographical region

    González, Manuel A.; Olea, Pedro P.; Mateo-Tomás, Patricia; Frutos Tena, Ángel de; Purroy, Francisco J.
    Ecological features and conservation requirements of populations at the latitudinal limits of a species' geographical range frequently differ from those in other parts of the range. Identifying such differences is key to implementing effective conservation strategies for threatened range-edge populations especially, in the context of rapid global warming, at the lower-latitude range edge. We studied habitat selection and diet of the endangered Cantabrian Capercaillie Tetrao urogallus cantabricus in a recently discovered population at the southernmost edge of the sub-species' range. This is the only Western Capercaillie population in the Mediterranean biogeographical region. We combined non-systematic surveys based on questionnaires, reports...

  10. A new species of sand racer, Psammodromus (Squamata: Lacertidae), from the Western Iberian Peninsula

    Fitze, Patrick S.; González-Jimena, Virginia; Zardoya, Rafael; San José, Luis M.
    [EN] A new species of lacertid lizard of the genus Psammodromus is described from the Iberian Peninsula. Genetic and recently published phenotypic data support the differentiation of Psammodromus hispanicus into three, and not as previously sug-gested two, distinct lineages. Age estimates, lineage allopatry, the lack of mitochondrial and nuclear haplotype sharing between lineages, ecological niche divergence, and the current biogeographic distribution, indicated that the three lineages correspond to three independent species. Here, we describe a new species, Psammodromus occidentalis sp. n., which is genetically different from the other sand racers and differentiated by the number of femoral pores, number of...

  11. Procesos ambientales y conservación de recursos naturales

    Navas Izquierdo, Ana; Machín Gayarre, Javier; Valero-Garcés, Blas L.
    2 páginas

  12. Can cover crops reduce rabbit-induced damages in vineyards in southern Spain?

    Barrio, Isabel C.; Villafuerte, Rafael; Tortosa, Francisco S.
    Damage caused by wildlife foraging can lead to significant agricultural losses and the problem can be further complicated if the damage-inducing animal is a valuable resource in its own right. Provision of alternative food sources such as cover crops might be a means of reducing the damage which appears to be linked to scarcity of alternative foods in intensively-managed agroecosystems. Cover crops may provide other benefits to agroecosystems, i.e. preventing soil erosion but can potentially have some undesired consequences, i.e. water competition with the cash crop. In our study, we tested the effectiveness of cover crops in reducing the damage...

  13. Variabilidad espacial del transporte de sedimento en la cuenca superior del río Aragón

    Navas Izquierdo, Ana; Navas Izquierdo, Ana; Valero-Garcés, Blas L.; Gaspar Ferrer, Leticia; García-Ruiz, José María; Beguería, Santiago; Machín Gayarre, Javier; López-Vicente, Manuel
    [ES] En el siglo pasado se produjo una importante regulación de los recursos hídricos en España con la construcción de numerosos embalses. En 1959, el río Aragón fue represado en Yesa (Depresión Interior del Pirineo Central) y desde entonces los sedimentos se han ido acumulando en su vaso, reduciendo así su capacidad inicial de almacenamiento de agua. En este trabajo se analiza el transporte de sedimentos en la red hidrológica del río Aragón desde la cabecera hasta el embalse de Yesa. Para ello se ha realizado el muestreo de aguas superficiales en 44 puntos distribuidos en las principales subcuencas del...

  14. A 2,500-year multi-proxy reconstruction of climate change and human activities in northern Spain: the Lake Arreo record

    Corella, Juan Pablo; Stefanova, Vania; El Anjouni, Adel; Rico, Eugenio; Giralt, Santiago; Moreno Caballud, Ana; Plata-Montero, Alberto; Valero-Garcés, Blas L.
    Lake Arreo sequence (western Ebro Basin, Spain) illustrates the century-scale climatic variability and human interactions in the landscape during the last 2.5 kyr in the low lands of northern Spain. Two sediment cores from shallow-water and deep-water environments were analyzed using sedimentological, geochemical, mineralogical, biological ¿ diatoms, pollen and charcoal content ¿ and radiometric techniques for absolute dating. The shallow-water sequence indicates a rapid evolution from an alluvial-influenced wetland prior to 7th century BC to a wetland during the Ibero-Roman Humid Period (BC 630¿AD 465) and a deeper, carbonate producing lake during the Dark Ages Cold Period (AD 465¿890). The...

  15. La secuencia de terrazas cuaternarias del río Alcanadre (Provincia de Huesca): Caracterización y consideraciones paleoambientales

    Calle, Mikel; Sancho Marcén, Carlos; Peña-Monné, José Luis; Cunha, P.; Oliva-Urcia, Belén; Pueyo, E.
    [EN] A very extensive sequence of Quaternary fluvial terraces composed of nine strath levels (from Qt1 to Qt9) has been recognized in the Alcanadre River valley (Ebro basin, Huesca province). New mapping, altimetric, stratigraphic, pedogenic and chronological data have been supplied. A braided fluvial sedimentary environment is deduced. The confinement of the fluvial system increases as a response to drainage incision. Pedogenic carbonate morphology reaches highest development (stage VI) with the age. Palaeomagnetic data indicate that, tentatively, the age of Qt1 is near 1000 ky and the age of Qt2 is around 780 ky. In addition, numerical ages of Qt5,...

  16. El paleolago de la larri (valle de Pineta, Pirineos): Significado en el contexto del último máximo glaciar en el Pirineo

    Salazar-Rincón, A.; Mata-Campo, María Pilar; Rico, María Teresa; Valero-Garcés, Blas L.; Oliva-Urcia, Belén; Ibarra, P.; Rubio, F.M.; Grupo HORDA
    [EN] The unique geological framework of the >los Llanos de La Larri> (Ordesa-Monte Perdido National Park) facilitated the genesis of a relevant juxtaglacial sedimentary record during the last glacial phase in the central Pyrenees. In this study we conducted a geomorphological and outcrop survey, an electric tomography study and the definition of the main sedimentological units by means of the study of 3 cores up to 17 m long. The combined study of surface and underground data has allowed us to define a paleolacustrine sedimentary sequence more than 40 m thick and the geometry and nature of the units of...

  17. Sedimentary evolution of La Parra karstic lake (Cuenca) over the last 1600 years: Paleohydrology, climate, and human impact | Evolución sedimentaria del lago kárstico de La Parra (Cuenca) durante los últimos 1600 años: Paleohidrología, clima e impacto humano

    Barreiro-Lostres, Fernando; Moreno Caballud, Ana; Giralt, Santiago; Valero-Garcés, Blas L.
    Lake La Parra (39° 50', 1° 52', 1014 m) is a small (1 ha), relatively deep (Zmax = 17.5 m), freshwater (TDS = 356 mg/L) monomictic lake with a circular morphology (116 m diameter), developed in a doline that intercepted the local Jurassic-Cretaceous aquifer. It is part of a karstic lake complex of seven lakes located in the Iberian Range (Cuenca, East of Spain). Sediment cores obtained in the central part of the lake were analysed using sedimentological, microscopic, geochemical and physical techniques. The ca. 7 m long sequence is mainly composed by clastic carbonated sediments, characterized by a high...

  18. Lacustrine carbonates of Iberian Karst Lakes: Sources, processes and depositional environments

    Valero-Garcés, Blas L.; Morellón, Mario; Moreno Caballud, Ana; Corella, Juan Pablo; Martín-Puertas, Celia; Barreiro-Lostres, Fernando; Pérez-Sanz, Ana; Giralt, Santiago; Mata, M. Pilar
    [EN] Carbonates are the main components of Iberian Quaternary lake sediments. In this review we summarize the main processes controlling carbonate deposition in extant Iberian lakes located in Mesozoic and Tertiary carbonate-dominated regions and formed through karstic activity during the Late Quaternary. The lakes, relatively small (1 ha to 118 ha) and relatively shallow (Zmax = 11 to 40 m) provide examples of the large variability of sedimentary facies, depositional environments, and carbonate sources. Hydrology is dominated by groundwater inflow except those directly connected to the fluvial drainage. Nine lakes have been selected for this review and the main facies...

  19. Vegetation changes and human settlement of Easter Island during the last millennia: a multiproxy study of the Lake Raraku sediments

    Cañellas-Boltà, Núria; Rull, Valentí; Sáez, Alberto; Margalef, Olga; Bao, Roberto; Pla-Rabes, S.; Blaauwg, Maarten; Valero-Garcés, Blas L.; Giralt, Santiago
    34 p. Versión post-print del artículo (versión revisada y corregida sin la maquetación editorial)

  20. Rabbits, weeds and crops: Can agricultural intensification promote wildlife conflicts in semiarid agro-ecosystems?

    Barrio, Isabel C.; Bueno, C. Guillermo; Villafuerte, Rafael; Tortosa, Francisco S.
    Agricultural intensification has led to the extreme simplification of agricultural landscapes. The subsequent impoverishment of farmland plant communities can drive dramatic changes in the associated food webs of agricultural systems, with potential implications for vertebrate pest management. Weeds may provide alternative food sources for damaging species and thus contribute to reducing their damage, which is particularly desirable if the species is a valuable resource in its own right. Wild rabbits (Oryctolagus cuniculus) are a game species of great conservation value in the Iberian Peninsula that cause frequent damage to crops. Here we describe the dynamics of non-crop plant communities over...

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