Universitat de Barcelona
Ara mostrant els elements 27-46 de 180
The biodiversity of a country is part of its natural wealth and the study of it is fundamental for a scientific researcher, such is the case of the Panamanian marine coasts in which there has not been an exhaustive taxonomic ...
[cat] La vespeta del castanyer, Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae) és una espècie cedidògena originària de l'est de la Xina, que ataca tots els arbres del gènere Castanea (Fagaceae) col·lectant-se per ...
La conservació de les espècies amenaçades requereix entendre els factors que determinen la selecció de l’hàbitat, la supervivència i la productivitat de les seves poblacions. Sota l’actual context d’intensificació agrícola, ...
The reservoir size and pathway rates of the nitrogen (N) cycle have been deeply modified by the human enhancement of N fixation, atmospheric emissions, and climate warming, doubling the reactive nitrogen (Nr) available in ...
El aumento de la población mundial en las últimas décadas, junto con la disminución de las tierras cultivables, ha puesto de manifiesto la necesidad de aumentar la producción agrícola para satisfacer la creciente demanda ...
Rice (Oryza sativa) is the most important crop for human direct consumption, but its yield and production are strongly affected by biotic and abiotic stresses. Rice is the most salt-sensitive cereal and in addition, salinity ...
The general aim of this PhD thesis was to study, develop and apply different breeding techniques in melon species in order to produce new commercial cultivars. The three specific objectives of this thesis are: 1. To ...
[eng] Deer populations are increasing in recent times. One of the main causes is the abandonment of agriculture and extensive livestock farming. This thesis focuses on expanding our knowledge about the biology of red deer ...
Los futuros cambios climáticos ocasionarán una subida de las temperaturas y déficit en la disponibilidad de agua para la agricultura así como mayor concentración de CO2 en la atmósfera, donde el estatus hídrico y el flujo ...
Les dinoflagel·lades són un dels grups majoritaris del fitoplàncton marí. Algunes espècies d’aquest grup produeixen proliferacions que causen diversos efectes no desitjats tant en l’ecosistema marí com a l’espècie humana. ...
Dissolved organic matter (DOM) is an important source of carbon for aquatic microorganisms and it regulates many biogeochemical processes. Therefore, changes in river DOM concentration and properties could notably affect ...
Feather mites are among the most abundant and commonly occurring bird ectosymbionts. They live permanently on the host body, are adapted to inhabit well-defined host microhabitats and are found in almost all avian groups. ...
[eng] The principal challenge of conserving marine megaherbivores is that they typically range over extensive areas that far exceed the spatial scales of conventional management, transcending protected areas, and often ...
Benthic diatoms, photoautotrophic, silicate plated, single-celled aquatic organisms dwelling on substrates, have been used in bioindication, since they are good indicators of ecological water state. In this thesis, we have ...
[eng] The exploration of marine environments, especially the deep sea, has been an ongoing effort. With the majority of Earth’s surface covered by oceans, the invention of SCUBA and subsequent deep-sea expeditions has ...
Cold-water coral (CWC) habitats dwell on continental shelves, slopes, canyons, seamounts, and ridge systems around the world’s oceans, from 50 m to depths up to 4000 m. CWC species provide heterogeneous habitats supporting ...
Gypsophile species are edaphic endemics of gypsum soils, and they are considered specialists of this stressful substrate. Gypsum endemics from different families and regions of the world tend to show a unique leaf elemental ...
[spa] Debido a las condiciones ambientales y características biológicas únicas de los ambientes marinos antárticos, los efectos del cambio climático pueden ser devastadores y pueden reflejar el posible futuro a gran escala ...
Actualmente es ampliamente reconocido que las especies exóticas invasoras (EEI) son una de las principales amenazas para la biodiversidad junto al cambio climático y la pérdida y fragmentación de hábitat. Analizar el estatus ...
Las especies de peces mesopelágicas que se incluyen en esta investigación corresponden la familia Myctophidae (orden Myctophiformes) con las especies Ceratoscopelus maderensis, Hygophum benoiti y Benthosema glaciale para ...
