Mostrando ítems 31-50 de 74
Vergés Guirado, Alba (Fecha de defensa: 2002-03-07)
L'objectiu d'aquest treball ha estat l'estudi del gènere Kallymenia a la Península Ibèrica i a les<br/>Illes Balears, el qual es troba representat per les espècies següents: K. reniformis (Turner) J.<br/>Agardh, K. feldmannii ...
Mercadal i Corominas, Gabriel (Fecha de defensa: 2019-11-13)
The hay meadows in the Mediterranean region of Catalonia. Geobotanical characterisation, agri-environmental assessment, and study of the phytosociological relationships between hay meadows in Western Europe We locate ...
Gascón Garcia, Stéphanie (Fecha de defensa: 2003-12-12)
S'ha estudiat l'estructura i dinàmica del sistema bentònic de llacunes costaneres de la maresma dels aiguamolls de l'Empordà (NE de la península Ibèrica) i els factors que les determinen. Amb aquesta finalitat es van prendre ...
Abril, Sílvia (Fecha de defensa: 2008-04-18)
La present tesi intenta obtenir noves dades referents a la biologia i ecologia de la formiga argentina que poden arribar a ser cabdals per al disseny o millora de noves metodologies de control de l'expansió de la plaga en ...
Puig-Gironès, Roger (Fecha de defensa: 2016-12-22)
Wildfires are natural perturbations that affect the structure of the landscape and biodiversity. In the Mediterranean basin, wildfires occur especially in hot seasons. However, in recent years the number of fires with the ...
Sánchez, Noemí, 1976- (Fecha de defensa: 2006-05-30)
L'objectiu d'aquesta tesi doctoral ha estat estudiar a nivell taxonòmic i ecofisiològic les espècies de la família Faucheaceae (Rhodymeniales, Rhodophyta) presents a la península Ibèrica i a les illes Balears: Fauchea ...
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 the structure, composition ...
Jones Román, Gabriela (Fecha de defensa: 2012-06-11)
This study was conducted in burned and harvested areas of Catalonia. It was evaluated the effect of the granivorous in predispersive fruit removal of Smilax aspera and Quercus coccifera and postdispersive seed removal. ...
Mor Roy, Jordi-René (Fecha de defensa: 2019-09-19)
Mediterranean rivers are characterized by high hydrological variability and heterogeneity of habitats, placing themselves amongst arid and temperate climates, and are associated with high biological diversity. On the ...
Llanos Paez, Oriana Lucia (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 (Fecha 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 ...