Now showing items 57-76 of 80

    Nitrogen storm responses in an intermittent Meditterranean stream 

    Bernal Berenguer, Susana (Date of defense: 2006-06-30)

    The amount of dissolved inorganic nitrogen delivered to streams and groundwater has substantially increased in the last decades due to anthropogenic impacts. This fact has stimulated research on processes related to the ...

    Nutrient dynamics and metabolism in Mediterranean streams affected by nutrient inputs from human activities 

    Canals Merseburger, Mª Goretti (Date of defense: 2006-04-24)

    A full understanding of nutrient cycling in lotic ecosystems is crucial given the increasing influence of human activities on the eutrophication of streams and rivers. However, existing knowledge about nutrient cycling in ...

    On the track of cellular ecology. Methodological improvements and contributions of single-cell phosphatase activity on the ecology of phytoplankton in Pyrenean lakes 

    Diaz de Quijano i Barbero, Daniel (Date of defense: 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 ...

    Optimització de l'ús de la proteïna en dietes per a orada (Sparus aurata) 

    Caballero Solares, Albert (Date of defense: 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 ...

    Palaeoecological study of vegetation dynamics in the Neotropical Gran Sabana since the Late Glacial = Estudio paleoecológico de la dinámica de la vegetación en la Neotropical Gran Sabana desde el Tardiglaciar 

    Ballesteros Larrotta, Tania Marcela (Date of defense: 2016-02-08)

    The Gran Sabana (GS, Northern South America) is a humid savanna region (treeless savanna intermingled with forest patches) with a long history of vegetation changes under fire disturbances. A number of hypotheses seek to ...

    Pigments indicadors: estudi del senyal en estanys dels Pirineus i de la seva aplicació en paleolimnologia 

    Buchaca Estany, Teresa (Date of defense: 2005-04-25)

    L'objectiu general de la tesi era estudiar el senyal de pigments indicadors en diversos compartiments (columna d'aigua, sediment superficial i registre sedimentari) dels estanys d'alta muntanya dels Pirineus, per aprofundir ...

    Processos heterotròfics microbians a l'embassament de Sau / Heterotrophic microbial processes in the Sau reservoir 

    Comerma Gómez, Marta (Date of defense: 2003-03-24)

    We studied the planktonic food web in the eutrophic Sau Reservoir (Catalonia, NE Spain) taking account of both spatial as well as temporal scales. We have analysed several longitudinal transects (sampling from the river ...

    Relationships between streamwater nitrogen and primary uptake compartments: an isotopic approach 

    Pastor Oliveras, Ada (Date of defense: 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, ...

    Respuesta ecotoxicológica de comunidades microbentónicas de ríos mediterráneos. 

    Navarro Rodríguez, Enrique (Date of defense: 2001-12-19)

    Desde los albores de la civilización, los ríos son una de las vías habituales usadas por el hombre para desprenderse de parte de sus desechos. Por ello, los sistemas fluviales han sido espectadores privilegiados de la ...

    Revisión de la biología y ecología de la familia Brachylaimidae Joyeux et Foley, 1930 (Trematoda: Digenea) con especial énfasis en las especies parásitas de mamíferos 

    Montoliu Sanllehy, Isabel de (Date of defense: 1984-01-01)

    La finalidad de la presente obra es la de contribuir al conocimiento de la biología y ecología de los Digénidos representantes de la familia Brachylaimidae, mediante el estudio detallado del ciclo vital y de la evolución ...

    Role of trophic interactions between fishes, sea urchins and algae in the northwestern Mediterranean rocky infralittoral, The 

    Hereu Fina, Bernat (Date of defense: 2007-04-28)

    The discipline of ecology is habitually divided up into a whole range of different specialities, and this thesis forms part of what is commonly known as "community ecology" (Diamond and Case 1986). To be more precise, my ...

    Scale-dependent factors modulate sea urchin predation in macrophyte communities 

    Farina, Simone (Date of defense: 2015-07-10)

    Many nearshore temperate coastal ecosystems are strongly regulated by top-down control. This is particularly true of shallow macrophyte communities, where habitat structuring is heavily dependent on the ability of predators ...

    Situacions d'anòxia en zones estuàriques sense forçament mareal: una aproximació als balanços producció/consum d'oxigen 

    De Pedro Puente, Xavier (Date of defense: 2007-11-26)

    En aquesta tesi doctoral s'han estudiat les causes de l'aparició de fenòmens hipòxics i anòxics en un sistema costaner estuarià micromareal com la badia dels Alfacs (Mediterrani NW), pel període comprès entre el final dels ...

    Sources, transformations and controls of dissolved organic matter (DOM) in a Mediterranean catchment = Fonts, transformacions i controls de la matèria orgànica dissolta (DOM) a una conca Mediterrània 

    Catalán García, Núria (Date of defense: 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 ...

    Structure and Function in Fluvials Biofilms. Implications in River DOC Dynamics and Nuisance Metabolite Production 

    Vilalta Baliellas, Elisabet (Date of defense: 2004-07-26)

    The role of natural biofilms affecting the water quality in rivers has been the main theme in this study. Firstly, the study developed the capacity of biofilms in retention and/or production of DOC. Secondly, the study ...

    Ter River influence on Sau Reservoir limnology. Empirical and watershed-scale modeling 

    Marcé Romero, Rafael (Date of defense: 2007-05-29)

    The role of the materials coming from the watershed on the reservoir water quality is an emergent area of high scientific interest with many practical implications. In this study we investigated the influence of the materials ...

    The ecology and taxonomy of estuarine benthic diatoms and their use as bioindicators in a highly stratified estuary (Ebro Estuary, NE lberian Peninsula): a multidisciplinary approach = L’ecologia i la taxonomia de les diatomees bentòniques estuarianes i el seu ús com a bioindicadors en un estuari altament estratificat (l’estuari de l’Ebre, NE Península Ibèrica): un estudi multidisciplinari. 

    Rovira Torres, Laia (Date of defense: 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 ...

    The ecology of colonial phytoplankton = Ecología del fitoplancton colonial 

    Caraballo López, Tatiana (Date of defense: 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 ...

    The influence of Mediterranean riparian zones on stream nitrogen dynamics: A catchment approach. 

    Lupón i Navazo, Anna (Date of defense: 2015-11-16)

    Riparian areas are recognized to be natural filters of nitrogen (N) because they can substantially diminish the N delivery from terrestrial to aquatic ecosystems. However, understanding the influence of riparian zones on ...

    The role of Primary Uptake Compartments on stream Nitrogen cycling = El paper dels Compartiments Primaris en el ciclatge del Nitrogen als ecosistemes fluvials 

    Peipoch Güell, Marc (Date of defense: 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 ...