Universitat de Barcelona
La Universitat de Barcelona és la universitat pública principal de Catalunya, amb el nombre més gran d’estudiants i l’oferta formativa més àmplia i completa. A més, és el principal centre de recerca universitari de l’Estat i un dels més importants d’Europa, tant per nombre de programes de recerca com per l’excel·lència assolida en aquest terreny.Estretament vinculada a la història de Barcelona i de Catalunya, la UB combina els valors de la tradició amb el fet de ser una institució innovadora i d’excel·lència en l’àmbit docent, i és una universitat urbana, oberta i cosmopolita com la mateixa ciutat de Barcelona.Us convidem a conèixer la Universitat de Barcelona!
Si sou doctor o doctora de la Universitat de Barcelona i voleu publicar la vostra tesi a TDX, contacteu amb tdx@ub.edu. Per a més informació consulteu les preguntes més freqüents
Las lagunas litorales son sistemas altamente dinámicos en los que la vegetación sumergida juega un papel estructural y funcional fundamental. En esta tesis se ha realizado una aproximación a la ecología funcional de una ...
La finalidad de la presente obra es la de contribuir al conocimiento de la biología y ecología de los Digénidos representantes de la familia Brachylaimidae, mediante el estudio detallado del ciclo vital y de la evolución ...
Freshwater degradation has been largely attributed to excess nutrient concentrations of anthropogenic origin. Freshwater degradation in combination with water scarcity are the reason of severe stress on water resources ...
Se estudian los quironómidos desde diferentes ángulos tanto su sistemática como algunos aspectos de su ecología en los embalses españoles. La tesis se divide en tres partes: dos de sistemática y una de ecología. En la ...
Inland waters are active components of the global carbon (C) cycle that transform, store and outgas more than half of the C they receive from adjacent terrestrial ecosystems. However, fundamental uncertainties regarding ...
Habitats commonly occur as more or less interconnected patches constituting spatial heterogeneous mosaics. Connectivity and interactions among habitats can determine their functioning. Therefore, ecological patterns and ...
This thesis is aimed at the study of the flora and vegetation of the Guayana Highlands (GH), a set of -50 table mountains (called tepuis) located in the Guayana Shield of northern South America. Special emphasis is put on ...
The Gran Sabana (GS, Northern South America) is a humid savanna region (treeless savanna intermingled with forest patches) with a long history of vegetation changes under fire disturbances. A number of hypotheses seek to ...
Aquatic systems are under pressure from multiple stressors that affect the structure, the functioning, and the health of species, communities and ecosystems. One of the main human pressures affecting the Earth’s ecosystems ...
The annual dynamics of three different ammonia-oxidizing archaea (AOA) ecotypes (amoA gene) and of the SAGMCG-1 (Nitrosotalea-like aquatic Thaumarchaeota) group (16S rRNA gene) were studied by newly designed specific primers ...
The Ebro Delta-Estuary complex is one of the largest wetland areas in the western Mediterranean, and it is considered one of the most important estuarine zones in Europe. In 2013, the Ebro watershed, including its deltaic ...
Wildfires are expected to increase in frequency and intensity because of climate change and changes in land use and management. In last decades, the research on fire effects on aquatic systems has grown, but it has been ...
The Systems Approach Framework (SAF) is a methodological framework designed to enhance the efficacy of human decision-making processes within social-ecological systems with regard to sustainability. The SAF was applied in ...
Pyrenean high mountain lakes are naturally fishless due to natural barriers that have prevented the natural colonisation of fish species from lower streams. However, there have been numerous trout introductions to such ...
Climate change, along with other anthropogenic pressures (e.g. water pollution, overfishing and habitat degradation), is severely impacting oceans around the world, producing important changes in its physical and biological ...
Riparian areas are recognized to be natural filters of nitrogen (N) because they can substantially diminish the N delivery from terrestrial to aquatic ecosystems. However, understanding the influence of riparian zones on ...
The Mediterranean Basin is a climate-change hotspot of the world. Predicted reductions in annual precipitation, increases in mean temperature, and increases in the variability and occurrence of extreme droughts and heat ...
Many nearshore temperate coastal ecosystems are strongly regulated by top-down control. This is particularly true of shallow macrophyte communities, where habitat structuring is heavily dependent on the ability of predators ...
Nearshore marine ecosystems like seagrass meadows face a wide range of anthropogenic influences, impacting the system at different spatial and temporal scales. Managing these systems in the face of these pressures requires ...
Human activities have increased dissolved inorganic nitrogen (DIN) availability and modified the relative proportion of DIN as NO3- or NH4+ in running waters. Because nitrogen (N) is an essential element for in-stream ...
