Now showing items 29-48 of 181
Cuscó Martinez, Francesc (Date of defense: 2019-01-11)
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, ...
Palacín Lizarbe, Carlos (Date of defense: 2019-07-30)
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 ...
Navarro Arenas, Miriam (Date of defense: 2021-10-07)
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 ...
Ramos de Fuentes, Eduardo (Date of defense: 2018-09-28)
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 ...
Hooghvorst, Isidre (Date of defense: 2021-04-28)
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 ...
Gort Esteve, Araceli (Date of defense: 2023-09-22)
[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 ...
Medina Canzio, Susan Mery (Date of defense: 2017-09-15)
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 ...
Sampedro i Roig, Nagore (Date of defense: 2018-02-23)
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. ...
Guarch Ribot, Alba (Date of defense: 2017-07-24)
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 ...
Mihaela Stefan, Laura (Date of defense: 2016-12-12)
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. ...
Khamis, Abdulqader (Date of defense: 2023-10-24)
[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 ...
Burfeid Castellanos, Andrea Montserrat (Date of defense: 2018-09-20)
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 ...
Baena Cabrera, Patricia (Date of defense: 2024-05-16)
[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 ...
Montseny Cuscó, Maria (Date of defense: 2020-12-04)
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 ...
Cera Rull, Andreu (Date of defense: 2021-10-06)
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 ...
De Castro-Fernández, Paula (Date of defense: 2023-05-12)
[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 ...
Garcia Bustos, Karla (Date of defense: 2018-11-15)
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 ...
Contreras Fuentes, Tabit Alejandra (Date of defense: 2019-12-13)
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 ...
Campos Pena, Patricia (Date of defense: 2019-09-27)
Los hábitats utilizados por las tortugas marinas durante su desarrollo varían notablemente en cuanto a características ambientales y disponibilidad de alimento. Comprender los factores que determinan la selección del hábitat ...
Masó Planas, Albert (Date of defense: 2018-01-26)
En la primera parte de la tesis, intentamos comprobar la idea generalizada de que la vegetación determina las características de la comunidad de mariposas, para lo cual realizamos una investigación en un área geográfica ...