Mostrando ítems 21-40 de 174
Tarrats Sada, Pol (Fecha de defensa: 2018-01-12)
The study of past ecological changes is highly useful for understanding how ecosystems have responded to climate and human-induced disturbances. It is thus relevant in the context of climate change, as it allows several ...
Llorach Parés, Laura (Fecha de defensa: 2019-11-29)
The potential of natural products in general, and marine natural products in particular, as pharmacological entities has been widely demonstrated in recent years. Marine benthic ecosystems contain an extraordinary range ...
Marqués Feixa, Laia (Fecha de defensa: 2022-06-03)
El maltrato infantil es un fenómeno muy complejo que afecta de manera integral al individuo y se asocia con diferentes problemas de salud mental en la infancia, adolescencia y adultez. Aunque el estudio del trauma relacional ...
Peso Fernández, Marcos (Fecha de defensa: 2018-12-14)
The Pyrenean frog (Rana pyrenaica) is a Pyrenees endemic species, mostly distributed between Navarra and Aragón, and recently was described in few streams of France. The typical habitat of the species is mountain streams. ...
Córdoba González, Darío Eliecer (Fecha de defensa: 2022-07-18)
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 ...
Jara Chiquito, Juan Luis (Fecha de defensa: 2023-01-13)
[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 ...
Cuscó Martinez, Francesc (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 (Fecha de defensa: 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 ...
Montseny Cuscó, Maria (Fecha de defensa: 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 (Fecha de defensa: 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 ...