Now showing items 147-166 of 181
Castro López, Daniel (Date of defense: 2019-11-22)
Worldwide, biological diversity is declining at an unprecedented rate. Current environmental changes are causing water, ecological and biodiversity crises that, coupled with climate change, are affecting landscape patterns ...
Gamboa Badilla, Nancy (Date of defense: 2017-12-19)
Biological diversity in a global scale has been threaten seriously by anthropogenic disturbances in ecosystems. Changes in land cover and land use affect biodiversity, causing habitat loss and species extinction, or ...
Rezzouk, Fatima Zahra (Date of defense: 2023-09-15)
[eng] Wheat is a major staple food worldwide. Its cultural and economic importance is mainly highlighted in the Mediterranean region, among other regions of the world. However, wheat production is frequently challenged by ...
Ontoria Gómez, Yaiza (Date of defense: 2020-02-14)
Coastal ecosystems are highly threatened worldwide by multiple anthropogenic stressors that act at a range of spatial scales, from local to the global, and adversely affect their ecological functions and associated ...
Estévez Geffriaud, Virginia (Date of defense: 2021-02-03)
This thesis focuses on the development and subsequent application of a seed treatment protocol using a phytosanitary product named T34 Biocontrol (Biocontrol Technologies S.L., Spain) containing the active ingredient ...
Pereira de Felipe, Fernanda (Date of defense: 2020-01-15)
Sexual Segregation (SS) is a phenomenon that occurs across a wide range of animal species, and that had been broadly categorized in spatial/habitat segregation and social segregation. SS of a given species is often related ...
López Acosta, María (Date of defense: 2018-09-21)
Silicon (Si), in its dissolved form of silicic acid (DSi), is a key nutrient in the ocean. The availability of such nutrient in marine ecosystems is regulated through its use by silica-secreting organisms, a variety of ...
Muntán Bordas, Elena (Date of defense: 2016-12-13)
In recent decades, information about past snow avalanches in the Pyrenees is being acquired by searching in different sources. One of these sources are tree rings. In this Ph.D. thesis, dendrogeomorphological techniques ...
Chang, Chao-Ting (Date of defense: 2017-07-07)
The variations of ecosystem and soil respiration are mainly driven by temperature and precipitation, but the importance of temperature and precipitation could vary across temporal and spatial. At diurnal to annual temporal ...
Reyes González, José Manuel de los (Date of defense: 2021-05-26)
The revolution in biologging and satellite telemetry technologies in the last two decades has led to a new era in seabird research. This thesis brings new insights into the spatial ecology and migration of the Cory’s and ...
Cerecedo Iglesias, Catuxa (Date of defense: 2024-06-14)
[eng] The current rampant loss of biodiversity is known to be affecting human well-being the world over. Sustainability has become the global go-to solution to ensure the balance between economic growth, social well-being ...
Guerreiro Duarte Rivaes da Silva, Ana Sofia (Date of defense: 2018-12-14)
Migration associated with movements between breeding and wintering areas allow animals to maximize fitness in response to seasonal changes in resources (Dingle 2014). Some of the most incredible migrations in the animal ...
Pérez-Llorca, Marina (Date of defense: 2021-02-10)
Mediterranean species have to be in constant acclimation to seasonal environmental changes, including variations in water availability, air temperature and solar radiation. Due to global warming, these environmental changes ...
Cuesta Porta, Victor (Date of defense: 2023-11-13)
[eng] The oak gall wasps (Hymenoptera: Cynipidae: Cynipini) are a group of specialized endophytophagous microhymenopterans that induce galls on Fagaceae trees, principally oaks (Quercus L.). The systematics of this tribe ...
Lobato Vila, Irene (Date of defense: 2021-03-23)
The oak cynipid inquilines (Hymenoptera: Cynipidae: Synergini, Ceroptresini) are a group of specialized endophytophagous microhymenopterans that develop inside galls induced mainly by other cynipids on Fagaceae trees, ...
Mata Casanova, Noel (Date of defense: 2018-04-18)
Superfamily Cynipoidea (Hymenoptera: Apocrita) includes two very different groups of organismes. Macrocynipoids is a paraphyletic group of parasitoids of wood-bearing beetle larvae, characterized by its big size, and with ...
Bellvert Bantí, Adrià (Date of defense: 2023-11-02)
[eng] Without a shadow of a doubt, adaptive radiation processes have played a major role in our current understanding of how species evolved on our planet. Since the original proposal of the theory of evolution by natural ...
Sitjà Poch, Cèlia (Date of defense: 2020-11-05)
The general outline of this thesis was to assess the potential of the Mediterranean water masses to transport deep-sea fauna towards the Atlantic Ocean. By examining the effects that the bathyal water mases moving from the ...
Bastias Álamo, Elliot (Date of defense: 2018-04-11)
Understanding the dynamics of leaf litter inputs in streams involves assessment of retention, spatial distribution and processing of leaf litter inputs. However, leaf litter dynamics in streams has been mostly studied by ...
Osorio Álvarez, Víctor (Date of defense: 2024-02-06)
[eng] High mountain freshwater ecosystems, such as Pyrenean lakes, are distinguished by their unique ecological characteristics, which encompass their near-pristine undisturbed state, unique biodiversity, and their role ...