Ara mostrant els elements 41-60 de 75
Llanos Paez, Oriana Lucia (Data de defensa: 2024-02-07)
Non-perennial rivers and streams are defined as systems that cease to flow at some point in space and time along their course. These systems are widespread globally representing more than half of the global river network, ...
Quintana Pou, Xavier (Data de defensa: 1995-10-10)
In this study the principal disturbance factors of the Empordà saltmarsh and their influence on water composition, and on plankton community structure and composition are analyzed. The importance of the turnover rate is ...
Bernal Montolio, Meritxell (Data de defensa: 2013-07-22)
Climatic models predict higher fluxes of UV-B radiation and a decrease in summer precipitation in the near future for the Mediterranean region. The UV radiation can be an oxidative stress factor for plants affecting their ...
Cano-Barbacil, Carlos (Data de defensa: 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 ...
Font Payeras, Toni (Data de defensa: 2014-05-13)
La pesca recreativa és una de les activitats turístiques més practicades a les zones costaneres arreu del món, implicant a un gran nombre de persones i per tant una pressió sobre els recursos gens menyspreable, especialment ...
Rubio Gracia, Francesc (Data de defensa: 2021-10-27)
This thesis aimed to assess the responses of stream biota to flow alterations, in terms of water velocity increments and reductions of discharge, and to metal pollution. The investigations performed encompassed (i) ...
Tuulaikhuu, Baigal-Amar (Data de defensa: 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 ...
Rost Bagudanch, Josep (Data de defensa: 2011-06-28)
The objective of this thesis is to analyze the effect of the transformation in the habitat that postfire salvage logging supposes on birds in Mediterranean pine forests, at different levels: species, community and ecosystem, ...
Vila Espuña, Sílvia (Data de defensa: 2010-04-08)
El penegal, Helicolenus dactylopterus dactylopterus (Pisces: Scorpaeniformes), és una espècie que habita profunditats d'entre els 200 i 1000 m i presenta una clara distribució batimètrica en funció de la seva talla. ...
Sàbat Bofill, Maria (Data de defensa: 2005-11-07)
En aquest treball de tesi doctoral es descriu l'estructura gonadal, gametogènesi i cicle anual de Scorpaena porcus, S. scrofa i S. elongata per tal d'aprofundir en el coneixement dels diferents graus d'especialització dins ...
Mora Gómez, Juanita (Data de defensa: 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 ...
Ann, Vannak (Data 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 characteristics generate ...
Joher Sais, Sergi (Data de defensa: 2016-01-14)
En aquesta tesi es van descriure els principals fons algals del detrític costaner de la plataforma continental de Mallorca i Menorca (illes Balears, Espanya), i es van proposar mètodes efectius per al seu mostreig tant a ...
Verdura Brugarola, Jana (Data de defensa: 2021-06-04)
Macroalgal forests represent some of the most productive and biodiverse habitats on Earth. In the Mediterranean Sea, species of the genus Cystoseira sensu lato dominate the well-preserved subtidal rocky habitats where ...
Tornero Pinilla, Irene (Data de defensa: 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 ...
Ortiz Álvarez, Rüdiger (Data de defensa: 2018-05-18)
The microbial metacommunity of the Pyrenees mountain range has never been studied at the regional level. In this PhD thesis, the main goal is to describe the taxonomic diversity and reveal the ecological processes (biotic ...
Romero Blanch, Ferran (Data de defensa: 2019-12-20)
Human exploitation of river ecosystems, together with the increasing pressure that represents climate change, is posing rivers worldwide at risk. In rivers, microorganisms are ecologically very important. Most of ...
Boy Roura, Mercè (Data de defensa: 2013-10-04)
Nitrate groundwater pollution in the Osona region is a persistent and widespread problem. Nitrate concentrations are commonly above the drinking water threshold of 50 mg/L in wells and springs. ANOVA and logistic regression ...
Souza, Edson Roberto da (Data de defensa: 2015-07-29)
Dada la importancia de ilustraciones científicas en los procesos de aprendizaje de contenidos geológicos, se investigó posibles relaciones entre su potencial educativo y sus etapas de producción en los libros de texto de ...
Huerta Buitrago, Belinda (Data de defensa: 2016-04-12)
Occurrence, fate, and adverse effects of emerging contaminants in the aquatic environment have become a matter of concern, since these compounds have been persistently detected in wastewater treatment plant (WWTP) effluents, ...