Mostrando ítems 11-20 de 30
Mandarić, Ladislav (Fecha de defensa: 2018-10-24)
The main aim of this thesis was to establish a link between the urban origin of chemical contamination (e.g. PhACs) and other stressors, particularly associated to water scarcity (Chapter 1, 2, and 3). ...
Ylla i Monfort, Irene (Fecha de defensa: 2011-01-21)
La comunitat bentònica dels ecosistemes fluvials processa una gran quantitat de la matèria orgànica que arriba als rius. L'origen de les entrades de material (autòctones o al·lòctones), la seva composició ...
Gionchetta, Giulia (Fecha de defensa: 2019-10-25)
Hydrological drought is a process of natural desiccation mainly due to large shortage of rainfall events. Reduced precipitations and prolonged droughts are spreading worldwide and threaten the integrity ...
Ricart Viladomat, Marta (Fecha de defensa: 2011-01-14)
L'activitat humana representa una de les majors causes d'entrada d'una gran varietat de substàncies en els ecosistemes fluvials. L'objectiu principal d'aquest treball es investigar els efectes que els ...
Compte Ciurana, Jordi (Fecha de defensa: 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 ...
Bonet Sánchez, Berta (Fecha de defensa: 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 ...
Àvila Izquierdo, Núria (Fecha de defensa: 2017-05-26)
Autotrophic and heterotrophic microorganisms are two essential functional units in the microbial food web of aquatic ecosystems. They play a key role in nutrient cycling and carbon flow and influence ...
Timoner Amer, Xisca (Fecha de defensa: 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 ...
Srean, Pao (Fecha de defensa: 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 ...
Ann, Vannak (Fecha de defensa: 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 ...