Mostrando ítems 21-40 de 80
Caballero Solares, Albert (Fecha de defensa: 2015-03-04)
Si vol consolidar-se com a explotació econòmicament i ecològicament sostenible, la piscicultura ha de deslligar-se de la pesca mitjançant la reducció del contingut de farina de peix als pinsos. Aquesta fita pot ser assolida ...
Merbt, Stephanie Nikol (Fecha de defensa: 2015-01-23)
The main goal of this PhD thesis was the study of the ammonium oxidation process in high nutrient loaded urban streams. We aimed to unveil regulating factors and driving mechanisms from the organisms to the ecosystem scales ...
Rodríguez Climent, Sílvia (Fecha de defensa: 2014-12-05)
The Ebro Delta represents the most important wetland area in Catalonia, the second most important in Spain (after Doñana National Park) and one of the most important estuarine zones in Europe. Although relatively recently ...
Mas Martí, Esther (Fecha de defensa: 2014-11-14)
Changes in temperature and precipitation due to climate change are expected to increase stream water temperature and reduce their discharge. Consequently, more streams might face temporality, experiencing flow intermittency ...
Ejarque Gonzalez, Elisabet (Fecha de defensa: 2014-11-17)
Rivers play a key role in the global biogeochemical functioning, as they link the biogeochemical cycles of the terrestrial and oceanic systems. In the framework of the carbon cycle, streams and rivers receive dissolved ...
Diaz de Quijano i Barbero, Daniel (Fecha de defensa: 2014-07-29)
Comparative studies between different enzyme labelled fluorescence (ELF) protocols and fluorescence quantification methods were performed to improve the quantification of single-cell phosphatase activity (PA) measurements ...
Peipoch Güell, Marc (Fecha de defensa: 2014-06-25)
The main goal of this thesis is to investigate how (15)N natural abundances can help understanding the role of different primary uptake compartments (i.e., biofilm, filamentous algae, bryophytes, macrophytes; PUCs) on ...
Pastor Oliveras, Ada (Fecha de defensa: 2014-06-13)
The overarching goal of this dissertation was to explore relationships between streamwater nitrogen (N) and the most representative primary uptake compartments (PUCs) in stream ecosystems (e.g. microbial biofilm, algae, ...
Sanpera Calbet, Isis (Fecha de defensa: 2014-04-11)
Streams are complex and highly diverse ecosystems. Within the stream network, headwater streams (1st to 3rd order) are highly important. Headwaters represent most of the total length, influence the structure and functioning ...
Kersting, Diego K. (Fecha de defensa: 2014-02-07)
Marine ecosystems are declining worldwide threatened by an increasing number of stressors. Global change-related disturbances have highlighted the need of new complementary conservation measures; for which the knowledge ...
Caraballo López, Tatiana (Fecha de defensa: 2013-12-13)
Phytoplankton embraces a large diversity of life forms, from pioneer oxygenic photosynthetic cyanobacteria to a broad spectrum of phylogenetically distant eukaryotic organisms. In many of the evolutionary branches, colonial ...
Rovira Torres, Laia (Fecha de defensa: 2013-11-21)
The general aim of the thesis was to improve knowledge of the ecology and taxonomy of estuarine benthic diatoms in a highly stratified Mediterranean estuary, in order to evaluate their potential use as bioindicators of ...
Vázquez Garcia, Eusebi (Fecha de defensa: 2013-10-11)
The studies presented in this thesis focus on the biogeochemistry of dissolved organic matter (DOM) in an intermittent stream in a Mediterranean climate zone, with great emphasis on extreme hydrologic events: floods and ...
Catalán García, Núria (Fecha de defensa: 2013-09-13)
Dissolved organic matter (DOM) is a primary source of organic carbon in aquatic ecosystems. Inland waters actively transform DOM, having a relevant effect on the regional and global carbon budgets. DOM quantity and quality ...
Gera, Alessandro (Fecha de defensa: 2013-06-21)
Overall, this thesis is an attempt at approaching seagrass ecosystems from a landscape perspective, with the aim of increasing knowledge about the processes generating patterns at large spatial scales, and understanding ...
Mendoza Barberá, Guillermo de (Fecha de defensa: 2013-06-20)
“Lake macroinvertebrates and the altitudinal gradient in the Pyrenees [Los macroinvertebrados lacustres y el gradiente altitudinal en los Pirineos]” is a thesis about freshwater macroinvertebrate communities inhabitting ...
Guallar Morillo, Carles (Fecha de defensa: 2013-05-24)
En la costa catalana s’ha observat la presència d’unes capes d’aigua properes al fons riques en clorofil•la a (HCNBL, de l’anglès High Chlorophyll Near Bottom Layer). Aquestes estructures productives principalment es ...
Muñoz Camarillo, Gloria (Fecha de defensa: 2013-04-05)
El mejillón cebra, Dreissena polymorpha (Pallas, 1771), es conocido por ser una de las especies invasoras de agua dulce más dañinas, tanto desde el punto de vista ecológico como económico, a nivel mundial. Este exitoso ...
Costalago Meruelo, David (Fecha de defensa: 2012-12-10)
In the northwestern Mediterranean anchovy and sardine are among the most ecologically and economically important species. Both species are planktivorous during all their life stages, which could alledgedly lead to expect ...
Barberán Torrents, Albert (Fecha de defensa: 2012-09-07)
El estudio de los microorganismos en cultivo puro ha propiciado el desarrollo de la genética, la bioquímica y la biotecnología. Sin embargo, la ecología ha permanecido reticente a incorporar a los microorganismos en su ...