Now showing items 21-40 of 54

    Trace elements biogeochemistry in high mountain lake catchments: identifying anthropogenic versus natural components from the atmospheric contamination legacy in remote natural areas 

    Bacardit Peñarroya, Montserrat (Date of defense: 2011-06-01)

    Human activities have been interfering with the natural biogeochemical cycles of trace elements since the ancient civilizations. Although they are inaccessible and remote, high mountain lake catchments are irrefutably ...

    Contribution of antioxidant enzymes to toxicity assessment in fluvial biofilms 

    Bonnineau, Chloé (Date of defense: 2011-06-23)

    Per tal d’avaluar l’impacte de la contaminació en els ecosistemes aquàtics, aquesta tesi es centra en una aproximació multi-biomarcador en els biofilms. En complement dels biomarcadors clàssics, es va demostrar que les ...

    Impact of chlorophenols and heavy metals on soil microbiota: their effects on activity and community composition, and resistant strains with potential for bioremediation 

    Cáliz Gelador, Joan (Date of defense: 2011-12-13)

    Pollution by toxic compounds is one of the most relevant environmental damages to ecosystems produced by human activity and, therefore, it must be considered in environmental protection and restoration of contaminated ...

    Primary succession in man-made wetlands: biodiversity, structure and dynamics of macrofaunal assemblages 

    Ruhí i Vidal, Albert (Date of defense: 2012-01-20)

    Man-made wetlands are often created to compensate for the loss or degradation of natural wetlands, but little is known about the processes taking place in these artificial environments, especially at the community level. ...

    The use of pulse amplitude modulated fluorescence techniques for metal toxicity assessment in fluvial biofilms 

    Corcoll i Cornet, Natàlia (Date of defense: 2012-02-20)

    Metal pollution in rivers is in great concern with human activities in the fluvial watershed. This thesis aims to investigate the potential use of chl-a fluorescence parameters as biomarkers of metal toxicity, and to find ...

    Biofilm responses to multiple stressors associated to global change in river ecosystems 

    Proia, Lorenzo (Date of defense: 2012-07-20)

    The main goal of this thesis is to investigate the effects of consequences of global change on fluvial biofilms. To achieve this objective a multi-marker approach has been used at different experimental scales. Our results ...

    Antioxidant enzyme activities in fluvial biofilms as biomakers of metal pollution 

    Bonet Sánchez, Berta (Date of defense: 2013-02-28)

    The present thesis aims to evaluate the use of antioxidant enzyme activities (AEA) of biofilm communities as biomarkers of metal pollution (mainly Zn) in fluvial ecosystems. In order to test AEA as biomarkers of metal ...

    Explaining the invasive success of the eastern mosquitofish (Gambusia holbrooki): the role of temperature 

    Carmona Catot, Gerard (Date of defense: 2013-12-09)

    The eastern mosquitofish (Gambusia holbrooki) is one of the most widely distributed and invasive inland fish. It is known that it has not been established in northern Europe or upstream of rivers, where the temperature is ...

    Stream biofilm responses to flow intermittency 

    Timoner Amer, Xisca (Date of defense: 2014-05-05)

    Streams experiencing a recurrent non-flow phase (i.e., flow intermittency) are characteristic of world regions with arid and semi-arid climates, where Mediterranean regions are part of. During non-flow streambed sediments, ...

    Leaf litter decomposition in Mediterranean streams: microbial processes and responses to drought under current global change scenario 

    Mora Gómez, Juanita (Date of defense: 2014-12-19)

    This thesis studied the principal environmental controlling factors and microbial mechanisms involved in leaf litter decomposition in Mediterranean intermittent streams. Additionally, drought disturbance in both Mediterranean ...

    Factors regulating the invasion of two Mediterranean anurans. The role of niche conservatism, species interaction and habitat selection 

    Escoriza, Daniel (Date of defense: 2015-03-02)

    Amphibians are a group in worldwide decline. The factors that are causing this decline are not well known, but could be multifactorial, related to the recent expansion of pathogens and habitat disturbance. One of these ...

    Effects of land uses and climate variability on the water quality of Mediterranean rivers: towards a regional vision of global change 

    Aguilera Becker, Rosana (Date of defense: 2015-03-10)

    This work investigated the effect of global change phenomena, particularly land use and climatic changes, on water quality patterns in Mediterranean rivers. A hybrid process-based and statistical model (SPARROW) was applied ...

    Understanding the ecological success of two worldwide fish invaders (Gambusia holbrooki and Gambusia affinis) 

    Srean, Pao (Date of defense: 2015-05-29)

    This thesis aims to contribute to the understanding of the invasive success of two invasive fishes (Gambusia affinis and G. holbrooki). We reviewed four Internet databases and the literature to clarify their introduction ...

    Linking river sediment physical properties to biofilm biomass and activity 

    Ann, Vannak (Date of defense: 2015-06-30)

    River sediments are composed by a variety of grain sizes which determine their permeability and biogeochemistry. The aim of this thesis was to test whether differences in river sediment physical characteristics generate ...

    Where nitrite respiration meets electrotrophy: diversity studies and functional characterization of autotrophic bacterial isolates from bioelectrochemical system 

    Vilar Sanz, Ariadna (Date of defense: 2016-02-05)

    Denitrifying biocathodes are used to treat nitrogen contaminated water resources. The present PhD dissertation have been characterized different bacterial families with a relevant role in denitrification process. Different ...

    Function and structure of river sediment biofilms and their role in dissolved organic matter utilization 

    Freixa Casals, Anna (Date of defense: 2016-02-18)

    The objective of this thesis was to study how sediment microbial communities in Mediterranean rivers used dissolved organic matter at different spatial and temporal scales. Results from the two field studies, showed that ...

    Influences of toxicants on freshwater biofilms and fish: from experimental approaches to statistical models 

    Tuulaikhuu, Baigal-Amar (Date of defense: 2016-06-10)

    The main aims of this thesis are: i) to evaluate arsenic toxicity in two major, interacting components of the freshwater ecosystem, biofilm and fish, to provide information on environmentally realistic exposures and on ...

    Diversity, dynamics and activity of Epsilonproteobacteria in a stratified karstic lake. Implications in carbon and sulfur cycles 

    Noguerola Solà, Imma (Date of defense: 2016-07-29)

    This doctoral thesis studies the abundance, diversity, seasonal dynamics and activity of Epsilonproteobacteria in a meromictic basin of Lake Banyoles during three year cycles. We applied a complementary array of molecular ...

    Effects of global change on fish assemblages in Mediterranean streams 

    Merciai, Roberto (Date of defense: 2016-09-30)

    L'objectiu d'aquesta tesi és de'explorar alguns aspectes de l'impacte humà sobre les poblacions de peixos i altres components dels ecosistemes fluvials Mediterranis de Catalunya. Es va mostrar com els peixos del Riu Llobregat ...

    Insights into the distribution and ecological role of members of the archaeal Phylum Bathyarchaeota. From the global to the local scale 

    Fillol Homs, Mireia (Date of defense: 2017-03-23)

    The Phylum Bathyarchaeota is currently one of the most studied uncultured archaeal phyla. Bathyarchaeota are phylogenetically diverse, globally ubiquitous and especially abundant in marine subsurface sediments. Despite ...