Results 51 to 60 of about 2,357,233 (223)

Impact of global change on the distribution of mountain mammals and birds

open access: yesConservation Biology, EarlyView.
Abstract Climate change and land‐use changes are key drivers of global biodiversity loss. Many species are shifting to higher elevations or latitudes in response to global warming, often encountering unfavorable land‐use conditions during the shift. These changes can lead to reduced range size and increased extinction risks, particularly for mountain ...
Chiara Dragonetti   +5 more
wiley   +1 more source

Directrices tectónicas durante la sedimentación del Cretácico medio en la zona central de la Cordillera Ibérica [PDF]

open access: yes, 1987
La distribución de espesores y facies del Cretácico medio de la zona central de la Cordillera Ibérica, permiten identificar un conjunto de umbrales, surcos y escalones.
García Quintana, Álvaro   +6 more
core  

EFL Learners’ Receptive Vocabulary Size and the Common European Framework of Reference for Languages: Estimates Across Levels

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT The Common European Framework of Reference for languages (CEFR) is widely used as a reference for language teaching and learning. However, providing vocabulary size (VS) estimates is beyond the CEFR's original aim. Previous research has also shown that learners’ receptive VS is related to overall proficiency and to the four language skills ...
Ferran Gesa
wiley   +1 more source

Aplicación del análisis de paleoesfuerzos a regiones plegadas: la compresión terciaria en el sector de Cariñena-Belchite (borde norte de la Cordillera Ibérica)

open access: yesEstudios Geologicos, 1996
La aplicación del análisis de paleoesfuerzos a las mesoestructuras frágiles (fundamentalmente fallas y picos estilolíticos) del borde norte de la Cordillera Ibérica en el sector de Cariñena-Belchite ha dado como resultado la determinación de cuatro ...
A. L. Cortés Gracia, A. M. Casas Sainz
doaj   +1 more source

Floral adaptation and modular trait evolution associated with a shift from bee to hummingbird pollination

open access: yesPlant Biology, EarlyView.
By comparing floral trait variation, integration and modularity in two sister species of Neotropical Costus with a pollination shift, we show that, despite pollination syndrome divergence, both species exhibit low floral variation and functional modularity, consistent with pollinator‐driven selection on traits mediating pollen transfer efficiency and ...
P. Juárez, K. M. Kay
wiley   +1 more source

Detrital zircon typology and U/Pb geochronology for the Miocene Ladrilleros-Juanchaco sedimentary sequence, Equatorial Pacific (Colombia): New constraints on provenance and paleogeography in northwestern South America

open access: yesGeologica Acta, 2017
Typology and internal texture analyses were performed on detrital zircons obtained from the Miocene sandstones of the Ladrilleros-Juanchaco sedimentary sequence (Colombia, Equatorial Pacific).
E. OSORIO-GRANADA   +5 more
doaj  

Fertilización y densidad de población en líneas de maíz en el noreste de México.

open access: yesAgronomía Mesoamericana, 2016
Se estableció un ensayo de líneas de maíz (Zea mays L.) con diferentes niveles de N, P Y densidades de población. Se utilizó un diseño de parcelas divididas en bloques al azar en donde las líneas fueron la parcela principal mientras que la parcela ...
Juan Antonio Morales
doaj   +1 more source

Nuevos antecedentes estratigráficos y geocronológicos para el Meso-Cenozoico de la Cordillera Principal de Chile entre 32° y 32°30’S: Implicancias estructurales y paleogeográficas [PDF]

open access: yesAndean Geology, 2014
New stratigraphical and geochronological constraints for the Mezo-Cenozoic deposits in the High Andes of central Chile between 32° and 32°30’S: Structural and palaeogeographic implications. Attempts to differentiate geological units of the Andean Principal Cordillera, between 31°30’S and 33°S, faced several problems until very recently.
Jara, Pamela, Charrier, Reynaldo
openaire   +3 more sources

Elevational variation in heart mass and suppression of hypoxia‐induced right ventricle hypertrophy in Andean leaf‐eared mice (Phyllotis)

open access: yesThe Journal of Physiology, EarlyView.
Abstract figure legend In lowland mammals that ascend to high elevation, hypoxia‐induced changes in the pulmonary circulation can give rise to hypoxic pulmonary hypertension (HPH) and associated right‐ventricle (RV) hypertrophy. Andean mice with broad elevational ranges have greater heart mass relative to body size at higher elevations, but they ...
Naim M. Bautista   +9 more
wiley   +1 more source

Fission track thermochronology of Neogene plutons in the Principal Andean Cordillera of central Chile (33-35°S): Implications for tectonic evolution and porphyry Cu-Mo mineralization Termocronología mediante trazas de fision de plutones neógenos en la Cordillera Principal Andina de Chile central (33-35°S): Implicancias para la evolución tectónica y mineralización de pórfidos de Cu-Mo

open access: yesAndean Geology, 2009
Apatite fission track data for Miocene plutons of the western slope of the Principal Andean Cordillera in central Chile (33-35°S) define a distinct episode of enhanced crustal cooling through the temperature range of the apatite partial annealing zone ...
Víctor Maksaev   +3 more
doaj  

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