Universitat de Barcelona
Now showing items 41-60 of 174
Biological diversity in a global scale has been threaten seriously by anthropogenic disturbances in ecosystems. Changes in land cover and land use affect biodiversity, causing habitat loss and species extinction, or ...
El fósforo es un macroelemento esencial para el desarrollo y crecimiento de todas las plantas. Sin embargo, el fósforo inorgánico (Pi), forma asimilable por las plantas, es cada vez más escaso en los suelos naturales y es ...
The study of past ecological changes is highly useful for understanding how ecosystems have responded to climate and human-induced disturbances. It is thus relevant in the context of climate change, as it allows several ...
En la primera parte de la tesis, intentamos comprobar la idea generalizada de que la vegetación determina las características de la comunidad de mariposas, para lo cual realizamos una investigación en un área geográfica ...
La mortalitat per captura accidental en les pesqueres de palangre representa una de les principals amenaces per a nombroses espècies d’ocells marins a nivell mundial. En el Mediterrani, aquesta mortalitat esta afectant ...
Les dinoflagel·lades són un dels grups majoritaris del fitoplàncton marí. Algunes espècies d’aquest grup produeixen proliferacions que causen diversos efectes no desitjats tant en l’ecosistema marí com a l’espècie humana. ...
Los insectos están presentes en todos los ecosistemas terrestres, donde desempeñan importantes funciones ecológicas y están en constante interacción con las actividades humanas, siendo algunos beneficiosos para ellas y ...
Headwater streams essentially link the terrestrial and the aquatic carbon cycle because they transport terrestrial organic and inorganic carbon downstream towards the oceans. However, most of these inputs are processed ...
Understanding the dynamics of leaf litter inputs in streams involves assessment of retention, spatial distribution and processing of leaf litter inputs. However, leaf litter dynamics in streams has been mostly studied by ...
Superfamily Cynipoidea (Hymenoptera: Apocrita) includes two very different groups of organismes. Macrocynipoids is a paraphyletic group of parasitoids of wood-bearing beetle larvae, characterized by its big size, and with ...
Temperate benthic communities face cumulative impacts from multiple stressors acting both at local and global scales. Understanding how local management and ocean warming affect the dynamics and resilience of dominant ...
En la present tesi s’avaluen les causes del creixement demogràfic de la població d’aufrany (Neophron percnopterus) a Catalunya, així com també s’estudia la influència dels canvis ambientals antropogènics, en especial dels ...
Biodiversity patterns are results of ecological and evolutionary processes. Understanding the forces shaping biodiversity patterns help to predict the responses of ecosystems to environmental change. Considering the role ...
Des de principis del segle XX fins a l’actualitat s’han produït importants transformacions socioeconòmiques (despoblament rural, industrialització, globalització) i ambientals (canvi climàtic, uniformització del mosaic ...
During the last decades, most of the studies based on climate change effects on vegetation physiology have focused on upland forests and species at their border of distribution, since, in both conditions, species are highly ...
This thesis fills important gaps of knowledge that will help to develop a proper conservation strategy for cetaceans in southern Iberian waters. We were able to define different ecological management units for bottlenose ...
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 ...
Silicon (Si), in its dissolved form of silicic acid (DSi), is a key nutrient in the ocean. The availability of such nutrient in marine ecosystems is regulated through its use by silica-secreting organisms, a variety of ...
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 ...
El objetivo principal de esta tesis es hacer un estudio completo del mestizaje genético de Argentina. Se pretende valorar la distribución territorial y regional del mestizaje y contrastarla con la información histórica y ...
