Ara mostrant els elements 60-79 de 80
Caballero Solares, Albert (Data de defensa: 2015-03-04)
Si vol consolidar-se com a explotació econòmicament i ecològicament sostenible, la piscicultura ha de deslligar-se de la pesca mitjançant la reducció del contingut de farina de peix als pinsos. Aquesta fita pot ser assolida ...
Ballesteros Larrotta, Tania Marcela (Data de defensa: 2016-02-08)
The Gran Sabana (GS, Northern South America) is a humid savanna region (treeless savanna intermingled with forest patches) with a long history of vegetation changes under fire disturbances. A number of hypotheses seek to ...
Buchaca Estany, Teresa (Data de defensa: 2005-04-25)
L'objectiu general de la tesi era estudiar el senyal de pigments indicadors en diversos compartiments (columna d'aigua, sediment superficial i registre sedimentari) dels estanys d'alta muntanya dels Pirineus, per aprofundir ...
Comerma Gómez, Marta (Data de defensa: 2003-03-24)
We studied the planktonic food web in the eutrophic Sau Reservoir (Catalonia, NE Spain) taking account of both spatial as well as temporal scales. We have analysed several longitudinal transects (sampling from the river ...
Pastor Oliveras, Ada (Data de defensa: 2014-06-13)
The overarching goal of this dissertation was to explore relationships between streamwater nitrogen (N) and the most representative primary uptake compartments (PUCs) in stream ecosystems (e.g. microbial biofilm, algae, ...
Navarro Rodríguez, Enrique (Data de defensa: 2001-12-19)
Desde los albores de la civilización, los ríos son una de las vías habituales usadas por el hombre para desprenderse de parte de sus desechos. Por ello, los sistemas fluviales han sido espectadores privilegiados de la ...
Montoliu Sanllehy, Isabel de (Data de defensa: 1984-01-01)
La finalidad de la presente obra es la de contribuir al conocimiento de la biología y ecología de los Digénidos representantes de la familia Brachylaimidae, mediante el estudio detallado del ciclo vital y de la evolución ...
Hereu Fina, Bernat (Data de defensa: 2007-04-28)
The discipline of ecology is habitually divided up into a whole range of different specialities, and this thesis forms part of what is commonly known as "community ecology" (Diamond and Case 1986). To be more precise, my ...
Farina, Simone (Data de defensa: 2015-07-10)
Many nearshore temperate coastal ecosystems are strongly regulated by top-down control. This is particularly true of shallow macrophyte communities, where habitat structuring is heavily dependent on the ability of predators ...
De Pedro Puente, Xavier (Data de defensa: 2007-11-26)
En aquesta tesi doctoral s'han estudiat les causes de l'aparició de fenòmens hipòxics i anòxics en un sistema costaner estuarià micromareal com la badia dels Alfacs (Mediterrani NW), pel període comprès entre el final dels ...
Catalán García, Núria (Data de defensa: 2013-09-13)
Dissolved organic matter (DOM) is a primary source of organic carbon in aquatic ecosystems. Inland waters actively transform DOM, having a relevant effect on the regional and global carbon budgets. DOM quantity and quality ...
Vilalta Baliellas, Elisabet (Data de defensa: 2004-07-26)
The role of natural biofilms affecting the water quality in rivers has been the main theme in this study. Firstly, the study developed the capacity of biofilms in retention and/or production of DOC. Secondly, the study ...
Marcé Romero, Rafael (Data de defensa: 2007-05-29)
The role of the materials coming from the watershed on the reservoir water quality is an emergent area of high scientific interest with many practical implications. In this study we investigated the influence of the materials ...
Rovira Torres, Laia (Data de defensa: 2013-11-21)
The general aim of the thesis was to improve knowledge of the ecology and taxonomy of estuarine benthic diatoms in a highly stratified Mediterranean estuary, in order to evaluate their potential use as bioindicators of ...
Caraballo López, Tatiana (Data de defensa: 2013-12-13)
Phytoplankton embraces a large diversity of life forms, from pioneer oxygenic photosynthetic cyanobacteria to a broad spectrum of phylogenetically distant eukaryotic organisms. In many of the evolutionary branches, colonial ...
Lupón i Navazo, Anna (Data de defensa: 2015-11-16)
Riparian areas are recognized to be natural filters of nitrogen (N) because they can substantially diminish the N delivery from terrestrial to aquatic ecosystems. However, understanding the influence of riparian zones on ...
Peipoch Güell, Marc (Data de defensa: 2014-06-25)
The main goal of this thesis is to investigate how (15)N natural abundances can help understanding the role of different primary uptake compartments (i.e., biofilm, filamentous algae, bryophytes, macrophytes; PUCs) on ...
Roca Carceller, Guillem (Data de defensa: 2015-07-06)
Nearshore marine ecosystems like seagrass meadows face a wide range of anthropogenic influences, impacting the system at different spatial and temporal scales. Managing these systems in the face of these pressures requires ...
Fabrés Francés, Joan (Data de defensa: 2002-11-19)
El desenvolupament de models acurats pels cicles biogeoquímics d'elements clau, especialment pel carboni,depèn del coneixement dels fluxos d'aquests elements a través dels límits de l'oceà. La quantificació delsfluxos entre ...
Costalago Meruelo, David (Data de defensa: 2012-12-10)
In the northwestern Mediterranean anchovy and sardine are among the most ecologically and economically important species. Both species are planktivorous during all their life stages, which could alledgedly lead to expect ...