Universitat de Barcelona
Now showing items 1-20 of 101
Al analizar los servicios ecosistémicos ecuatorianas del “Programa Nacional de Reforestación con fines de conservación ambiental, protección de cuencas hidrográficas y beneficios alternos (PNR)” mediante la adaptación ...
This thesis covers three important aspects of Antarctic heterobranchs: ecology, taxonomy, and systematics. The first section deals with ecological interactions of several nudibranchs. In Chapter 1, we chemically characterize ...
La entrada en el medioambiente de xenobióticos, procedentes de la actividad humana, que son biológicamente activos y de difícil eliminación, representa un grado de estrés que, a menudo, resulta inaceptable por los organismos ...
La riqueza de orquídeas en Colombia alcanza una cifra de 4.270 especies, sin embargo, nuevos hallazgos sugieren no haber llegado a un punto de inflexión. La condición epífita en el 69% de sus especies y su ubicación en el ...
This work is at the crossroads where conservation problems, arising from the biodiversity loss and environmental crisis, meet the difficulties of applying research outcomes in conservation practice, framed in a sustained ...
Our world is subjected to a panoply of drivers of change. In this context, the understanding on how our biosphere resists, absorbs or is altered by the changes, appears as a hot question in ecology. In this respect, two ...
The rates at which allochthonous species are introduced and become invasive worldwide are unprecedented and accordingly, the number of studies on invasion biology have increased during the past years. However, biological ...
Los depredadores marinos pueden cambiar su dieta a través del tiempo como consecuencia de cambios antropogénicos y naturales, por lo que un punto de referencia histórico aporta información básica y necesaria para comprender ...
The Pyrenean frog (Rana pyrenaica) is a Pyrenees endemic species, mostly distributed between Navarra and Aragón, and recently was described in few streams of France. The typical habitat of the species is mountain streams. ...
[cat] La vespeta del castanyer, Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae) és una espècie cedidògena originària de l'est de la Xina, que ataca tots els arbres del gènere Castanea (Fagaceae) col·lectant-se per ...
[cat] OBJECTIUS: L’objectiu general de la tesi és emprar dades de teledetecció i sistemes d’informació geogràfica per estimar i comprendre el rendiment i qualitat de varietats de blat mediterrani tot considerant els ...
The reservoir size and pathway rates of the nitrogen (N) cycle have been deeply modified by the human enhancement of N fixation, atmospheric emissions, and climate warming, doubling the reactive nitrogen (Nr) available in ...
Rice (Oryza sativa) is the most important crop for human direct consumption, but its yield and production are strongly affected by biotic and abiotic stresses. Rice is the most salt-sensitive cereal and in addition, salinity ...
Dissolved organic matter (DOM) is an important source of carbon for aquatic microorganisms and it regulates many biogeochemical processes. Therefore, changes in river DOM concentration and properties could notably affect ...
Benthic diatoms, photoautotrophic, silicate plated, single-celled aquatic organisms dwelling on substrates, have been used in bioindication, since they are good indicators of ecological water state. In this thesis, we have ...
Cold-water coral (CWC) habitats dwell on continental shelves, slopes, canyons, seamounts, and ridge systems around the world’s oceans, from 50 m to depths up to 4000 m. CWC species provide heterogeneous habitats supporting ...
Gypsophile species are edaphic endemics of gypsum soils, and they are considered specialists of this stressful substrate. Gypsum endemics from different families and regions of the world tend to show a unique leaf elemental ...
[spa] Debido a las condiciones ambientales y características biológicas únicas de los ambientes marinos antárticos, los efectos del cambio climático pueden ser devastadores y pueden reflejar el posible futuro a gran escala ...
Actualmente es ampliamente reconocido que las especies exóticas invasoras (EEI) son una de las principales amenazas para la biodiversidad junto al cambio climático y la pérdida y fragmentación de hábitat. Analizar el estatus ...
Las especies de peces mesopelágicas que se incluyen en esta investigación corresponden la familia Myctophidae (orden Myctophiformes) con las especies Ceratoscopelus maderensis, Hygophum benoiti y Benthosema glaciale para ...
