Now showing items 58-77 of 80
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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, ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
Roca Carceller, Guillem (Date of defense: 2015-07-06)
Nearshore marine ecosystems like seagrass meadows face a wide range of anthropogenic influences, impacting the system at different spatial and temporal scales. Managing these systems in the face of these pressures requires ...