Now showing items 25-44 of 55

    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 ...

    Fate and effects of copper in fluvial ecosystems: the role of periphyton 

    Serra Gasa, Alexandra (Date of defense: 2009-07-03)

    L'activitat humana és una de les majors causes d'elevades concentracions de nutrients i substàncies tòxiques en els ecosistemes fluvials. Entre la gran varietat de factors que alteren aquests ecosistemes, l'eutrofització ...

    Fish as ecological indicators in Mediterranean freshwater ecosystems 

    Benejam Vidal, Lluís (Date of defense: 2008-12-22)

    Podeu escriure el text directament o arrossegar-lo des d'un altre document<br/>L'objectiu d'aquesta tesi és contribuir a l'ús dels peixos continentals com a indicadors de l'estat ecològic a la conca Mediterrània. En el ...

    Food webs of Mediterranean coastal wetlands 

    Compte Ciurana, Jordi (Date of defense: 2010-07-21)

    En aquesta tesi doctoral s'han estudiat els efectes directes i indirectes de dos tipus d'espècies claus de la comunitat aquàtica dels aiguamolls de l'Empordà (aiguamolls costaners mediterranis amb una xarxa tròfica senzilla). ...

    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 ...

    Heterogeneïtat pigmentària en bacteris fotosintètics verds: fisiologia i significació ecològica 

    Borrego i Moré, Carles (Date of defense: 1996-11-15)

    Green bacteria possess one of the most complexes antenna systems within the group of the photosynthetic microorganisms. One reason for this complexity is the high diversity of pigments antenna, the bacteriochlorophylls ...

    Hydrological alteration, critical swimming speed and life history in inland fish 

    Cano-Barbacil, Carlos (Date of defense: 2022-11-18)

    Fresh waters are among the most biodiverse ecosystems globally but, at the same time, also the most threatened. Serious threats to freshwater ecosystems are, for example, habitat alteration, invasive alien species and ...

    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 ...

    Incidència de microorganismes i de compostos orgànics volàtils en l'aparició de defectes sensorials en suro 

    Prat i Botanch, Chantal (Date of defense: 2010-02-26)

    La incidència sobre el suro de defectes sensorials amb descriptors de florit-humitat és un dels principals problemes amb què s'enfronta la indústria surera. Els principals compostos relacionats amb aquest defecte son ...

    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 ...

    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 ...

    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 ...

    Limnological characteristics and zooplankton community structure of Mediterranean coastal lagoons undergoing restoration 

    Badosa i Salvador, Anna (Date of defense: 2007-03-06)

    Entre 1999 i 2003 es va desenvolupar un projecte Life de restauració a la maresma de La Pletera, afectada per un pla urbanització, i a la llacuna del Ter Vell, amb un elevat grau d'eutròfia (aiguamolls del Baix Ter, NE ...

    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 ...

    Metacommunities and biodiversity patterns in Mediterranean temporary ponds: the role of pond size, network connectivity and dispersal mode 

    Tornero Pinilla, Irene (Date of defense: 2020-03-13)

    We sampled the macrofaunal metacommunities in four networks of Mediterranean temporary ponds covering a wide range of pond sizes and different spatial extents. 1) In the smallest pond network, pond size was not related to ...

    Microbial communities responses in fluvial biofilms under metal stressed scenarios 

    Argudo Fernández, Maria (Date of defense: 2021-02-08)

    This thesis shows how the metals of natural and anthropic origin change significantly the composition of the prokaryotic communities (mainly the composition of bacteria). The β-diversity is the most sensitive variable to ...

    Nitrifying and denitrifying bacterial communities in the sediment and rhizosphere of a free water surface constructed wetland 

    Ruiz Rueda, Olaya (Date of defense: 2008-06-27)

    La contínua descàrrega de nutrients, sobretot fosfats i nitrogen, és la major causa d'eutrofització dels ecosistemes aquàtics. Els sistemes de tractament basats en aiguamolls construïts s'han emprat per reduir ells nivells ...

    Origin and fate of nitrite in model ecosystems: case studies in groundwater and constructed wetlands 

    Hernández del Amo, Elena (Date of defense: 2019-10-04)

    Nitrogen pollution in water is common in our environment, especially in places affected by agriculture and livestock, industry or wastewater discharge areas. Ammonium and nitrate are the most common pollutants and can be ...

    Phytoplankton dynamic in permanent and temporary waters of Empordà Salt marshes (NE Spain) 

    López i Flores, Rocío (Date of defense: 2005-07-05)

    Se ha estudiado la dinámica del fitoplancton en las lagunas costeras de Aiguamolls de l'Empordà. El fitoplancton esta sujeto principalmente al control "bottom-up", la variabilidad hidrológica y la disponibilidad de nutrientes ...

    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. ...