Browsing Departament d'Ecologia by Subject "574"

Assessing the impacts of human activities on the fïsh assemblages from the Ebro Delta coastal lagoons: towards a sustainable management model

Rodríguez Climent, Sílvia (Date of defense: 2014-12-05)

The Ebro Delta represents the most important wetland area in Catalonia, the second most important in Spain (after Doñana National Park) and one of the most important estuarine zones in Europe. Although relatively recently ...

Avaluació regional de la dinàmica recent de l'ecotò bosc subalpí-prats alpins als Pirineus

Batllori Presas, Enric (Date of defense: 2008-05-28)

El límit altitudinal del bosc, o ecotò superior bosc-prat alpí, constitueix per definició, la frontera entre l'estatge subalpí i l'estatge alpí separant, per tant, sistemes ecològics adjacents. És una de les fronteres més ...

Biology and population ecology of uncultured Archaea in natural environments analyzed by taxon-specific molecular markers = Biología y ecología poblacional de Archaeas no cultivadas en ambientes naturales analizadas mediante marcadores moleculares específicos

Restrepo Ortiz, Claudia Ximena (Date of defense: 2016-02-05)

The annual dynamics of three different ammonia-oxidizing archaea (AOA) ecotypes (amoA gene) and of the SAGMCG-1 (Nitrosotalea-like aquatic Thaumarchaeota) group (16S rRNA gene) were studied by newly designed specific primers ...

Climate and Atmospheric CO2 Effects on Iberian Pine Forests assessed by Tree-Ring Chronologies and their potential for Climatic Reconstructions

Andreu Hayles, Laia (Date of defense: 2007-10-25)

Two main purposes divided this Thesis into two parts, taking into account that the need of understanding current climatic fluctuations is still an important request of population living in the 21st century and the enormous ...

Climate-induced changes in headwater streams: Effects of warming and drought on resource-consumer trophic interactions

Mas Martí, Esther (Date of defense: 2014-11-14)

Changes in temperature and precipitation due to climate change are expected to increase stream water temperature and reduce their discharge. Consequently, more streams might face temporality, experiencing flow intermittency ...

Conservation of marine habitat-forming species under climate change: population genetics and demographic responses of the Mediterranean red gorgonian Paramuricea clavata.

Arizmendi Mejía, Rosana (Date of defense: 2015-11-25)

Climate change, along with other anthropogenic pressures (e.g. water pollution, overfishing and habitat degradation), is severely impacting oceans around the world, producing important changes in its physical and biological ...

Crustacean zooplankton dynamics in Lake Redon: a stoichiometric, biochemical and isotopic approach

Ventura Oller, Marc (Date of defense: 2005-01-28)

The aim of this thesis was to describe the life history variability of the assemblage of crustacean zooplankton in Lake Redon, with special emphasis in their life-cycles, ecological characteristics and their trophic ...

Dendroecología de "Pinus halepensis" Mill. en Este de la Península Ibérica e Islas Baleares: Sensibilidad y grado de adaptación a las condiciones climáticas

Ribas Matamoros, Montserrat (Date of defense: 2006-09-28)

El objetivo principal que se plantea en el presente trabajo es determinar la plasticidad del crecimiento radial del pino carrasco (Pinus halepensis Mill.) frente al clima. Más concretamente, evaluar el grado de adecuación ...

Ecologia de les comunitats de quironòmids en rius mediterranis de referència / Ecology of Chironomidae Communities in Mediterranean Reference Streams

Puntí Casadellà, Maria del Tura (Date of defense: 2008-01-18)

Aquest treball aborda l'ecologia de les comunitats d'un dels grups de macroinvertebrats bentònics més diversos i abundants dels nostres rius, els quironòmids. El principal objectiu d'aquesta tesi ha estat estudiar l'estructura ...

Ecología de la bahía El Fangar (delta del Ebro): Factores físico-químicos, biológicos, sus interacciones y propuesta de un modelo

Varas Schiavi, Manuel (Date of defense: 2012-06-01)

El delta del Ebro es uno de los más importantes de la Península Ibérica y del Mediterráneo. La bahía El Fangar, foco de este estudio, mide unos 12Km2, con valores de profundidad que varían entre los 0 y 8 metros. Presenta ...

Ecología y sistemática de los quironómidos (Insecta, Diptera) de los embalses españoles

Prat i Fornells, Narcís (Date of defense: 1978-06-21)

Se estudian los quironómidos desde diferentes ángulos tanto su sistemática como algunos aspectos de su ecología en los embalses españoles. La tesis se divide en tres partes: dos de sistemática y una de ecología. En la ...

Ecology and bioindicator potential of benthic macroinvertebrates in a Mediterranean salt wedge estuary: the Ebro River case

Nebra Costas, Alfonso (Date of defense: 2016-01-29)

The Ebro Delta-Estuary complex is one of the largest wetland areas in the western Mediterranean, and it is considered one of the most important estuarine zones in Europe. In 2013, the Ebro watershed, including its deltaic ...

Ecology and conservation of the Mediterranean endemic coral Cladocora caespitosa = Ecología y conservación del coral endémico del Mediterráneo Cladocora caespitosa

Kersting, Diego K. (Date of defense: 2014-02-07)

Marine ecosystems are declining worldwide threatened by an increasing number of stressors. Global change-related disturbances have highlighted the need of new complementary conservation measures; for which the knowledge ...

Ecology of the macroinvertebrate communities in Mediterranean rivers at different scales and organization levels

Bonada i Caparrós, Núria (Date of defense: 2003-04-02)

The main objective of this work has been to determine the structure of the macroinvertebrate communities in mediterranean rivers at different scales, organization and taxonomical levels. To achieve that, an appropriated ...

Efectes d'un incendi forestal en una riera mediterrània (Sant Llorenç del Munt, 2003)

Vila Escalé, Mireia (Date of defense: 2009-04-28)

DE LA TESI:<br/><br/>Es realitza l'estudi dels efectes d'un incendi forestal sobre la fisicoquímica, l'hàbitat i les comunitats biològiques d'una riera mediterrània, riera de Gallifa, i la seva comparació amb una riera ...

Effects of flow discontinuities on carbon gas fluxes in a Mediterranean fluvial network = Efecte de les dicontinuitats hidrològiques sobre els fluxes gasosos de carboni en una xarxa fluvial Mediterrània

Gómez Gener, Lluís (Date of defense: 2017-02-10)

Inland waters are active components of the global carbon (C) cycle that transform, store and outgas more than half of the C they receive from adjacent terrestrial ecosystems. However, fundamental uncertainties regarding ...

Effects of human activities on nitrogen cycling in Mediterranean streams: contrasts between nitrate and ammoniun dynamics

Ribot Bermejo, Miquel (Date of defense: 2015-03-27)

Human activities have increased dissolved inorganic nitrogen (DIN) availability and modified the relative proportion of DIN as NO3- or NH4+ in running waters. Because nitrogen (N) is an essential element for in-stream ...

Environmental shaping and carbon cycling in a macrophyte-dominated Mediterranean coastal lagoon

Obrador Sala, Biel (Date of defense: 2009-06-03)

Las lagunas litorales son sistemas altamente dinámicos en los que la vegetación sumergida juega un papel estructural y funcional fundamental. En esta tesis se ha realizado una aproximación a la ecología funcional de una ...

Estructura i contingut de nutrients a les capçades de "Quercus ilex" L. del bosc de les muntanyes de Prades: influència de les condicions naturals de creixement i efecte de manipulacions experimentals

Sabaté i Jorba, Santi (Date of defense: 1993-05-21)

L'objectiu general d'aquesta tesi queda emmarcat dins del coneixement del bosc mediterrani i en concret de l'alzinar. El que s'ha pretés és analitzar en el cas de l'alzina (Quercus ilex L.). 1) Com la disponibilitat d'aigua ...

Estructura y composición de las comunidades de macroinvertebrados acuáticos en ríos altoandinos del Ecuador y Perú. Diseño de un sistema de medida de la calidad del agua con índices multimétricos

Villamarín Flores, Christian Patricio (Date of defense: 2012-07-09)

En la presente tesis se muestrearon ríos sobre los 2000 msnm (ríos altoandinos tropicales) que se distribuyen en la amplia región de los Andes del Norte (Ecuador) y los Andes Centrales (Perú) en Sudamérica. El muestreo de ...