Mostrando ítems 106-125 de 181
Baldivieso Freitas, Paola (Fecha de defensa: 2017-06-26)
La intensificación de las actividades agrícolas en los últimos años ha supuesto un uso excesivo de insumos externos y un intenso laboreo del suelo que ha provocado contaminaciones a veces de carácter irreversible, el ...
Cano Rocabayera, Oriol (Fecha de defensa: 2019-10-29)
La introducció d’espècies invasores, juntament amb altres pertorbacions com l’augment dels nutrients, amenacen la biodiversitat nativa globalment. Les invasions biològiques d’espècies exòtiques es troben íntimament lligades ...
Talavera Roma, Marc (Fecha de defensa: 2018-06-29)
Des de principis del segle XX fins a l’actualitat s’han produït importants transformacions socioeconòmiques (despoblament rural, industrialització, globalització) i ambientals (canvi climàtic, uniformització del mosaic ...
Puértolas i Domènech, Laura (Fecha de defensa: 2016-11-30)
La recuperació d’espais fluvials és una activitat que ha anat en augment en els darrers anys però no disposava de mètodes d’avaluació que n’orientessin el disseny. L’objectiu de la tesi ha estat explorar la pràctica de la ...
Capdevila Lanzaco, Pol (Fecha de defensa: 2017-09-26)
Life history theory and population ecology have been especially neglectful of marine species, with most ecological principles developed from studies based on terrestrial species. This is especially true for macroalgae ...
Mosquera Vintimilla, Pablo (Fecha de defensa: 2023-04-19)
[eng] High-mountain tropical lakes in the South American continent are located in the upper part of the Andes range in the equatorial zone (Venezuela, Colombia, Ecuador, Peru, and Bolivia), altitudinally, usually above the ...
Arcones Segovia, Ángel (Fecha de defensa: 2019-09-19)
In this thesis we studied how the changes in the climate determine the distribution, diversity and conservation of a very representative group of the Arctic avifauna, the shorebirds. In the first chapter we explored the ...
Nadal Sala, Daniel (Fecha de defensa: 2019-11-28)
Semi-arid environments are zones where annual precipitation is less than a half of annual potential evapotranspiration, yet water availability is high enough to allow tree growth. Climate change is expected to have a major ...
Riyahi, Sepand (Fecha de defensa: 2017-09-21)
Human-altered environments have expanded rapidly in the past decades and made a huge impact on living organisms. Inhabiting in such a habitat can modify different traits in animals, allowing for a better adaptation to these ...
Tsagkari, Marouko (Fecha de defensa: 2022-06-01)
In the discussions on climate change, the transition to renewable energy is seen as one of the biggest and most urgent steps the world can take to avoid ecological collapse. At the same time, the decentralized and abundant ...
Medrano Cuevas, Alba (Fecha de defensa: 2020-02-21)
All marine ecosystems in the Mediterranean Sea are highly threatened by anthropogenic stressors that can alter their structure and function, especially in rocky shores. Moreover, extreme climate events are becoming more ...
Villastrigo Carbajo, Adrián (Fecha de defensa: 2019-09-27)
Understanding the evolutionary processes underlying extant biodiversity may help us to comprehend why species richness is not equally distributed between clades. One of the main causes to explain the disparity of species ...
Fleta Soriano, Eva (Fecha de defensa: 2017-06-07)
En esta tesis doctoral se estudian los mecanismos que las plantas pueden disponer para hacer frente al déficit hídrico reiterado, ya que en la naturaleza los ciclos repetidos de estrés son mucho más frecuentes que un solo ...
Resano Fantino, Magdalena (Fecha de defensa: 2018-10-25)
El objetivo principal de esta tesis es hacer un estudio completo del mestizaje genético de Argentina. Se pretende valorar la distribución territorial y regional del mestizaje y contrastarla con la información histórica y ...
Saborit González, Gerard (Fecha de defensa: 2019-07-10)
La locomoción bípeda humana es un importante hito evolutivo. Los humanos aprendemos a caminar a temprana edad, aunque no por ello los procesos mecánicos involucrados son simples. Fuerzas y energía deben sincronizarse creando ...
Trapote Forné, Mari Carmen (Fecha de defensa: 2019-09-16)
Varved lake sediments also known as annually laminated sediments, are natural paleoenvironmental archives containing high-resolution proxy data and precise chronologies. They are one of the few natural archives that can ...
Zajková, Zuzana (Fecha de defensa: 2020-01-20)
Movement is a fundamental component of behaviour and thus both are inextricably linked. Variation in movement patterns usually reflects different behaviours, including those most glaring, such as foraging, dispersal, ...
Aspillaga Cuevas, Eneko (Fecha de defensa: 2017-07-27)
Animal movement is a key biological process for the maintenance of ecosystem services, and a major concern for the conservation of biodiversity. The aim of movement ecology is to understand the causes and consequences of ...
Morera Pujol, Virginia (Fecha de defensa: 2020-01-17)
Movement is a widespread characteristic in the animal kingdom —occurring at many spatiotemporal scales— with consequences at an individual, population, species, and even ecosystem level. It is a very diverse character, ...
Buchaillot, Maria Luisa (Fecha de defensa: 2023-02-10)
[eng] Personal food security means that they have physical and economic access to sufficient, safe, and quality food. On the other hand, there are three main causes of food insecurity: 1. the high vulnerability of agriculture ...