Now showing items 155-174 of 174

    Taxonomic review of oak cynipid inquilines (Hymenoptera: Cynipidae), with special attention to the New World fauna and an approach to their global phylogeny 

    Lobato Vila, Irene (Date of defense: 2021-03-23)

    The oak cynipid inquilines (Hymenoptera: Cynipidae: Synergini, Ceroptresini) are a group of specialized endophytophagous microhymenopterans that develop inside galls induced mainly by other cynipids on Fagaceae trees, ...

    Taxonomical revision of subfamily Anacharitinae (Hymenoptera: Cynipoidea: Figitidae) 

    Mata Casanova, Noel (Date of defense: 2018-04-18)

    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 ...

    Testing the hypothesis of adaptive radiation and its eco-phenotypic implications 

    Bellvert Bantí, Adrià (Date of defense: 2023-11-02)

    [eng] Without a shadow of a doubt, adaptive radiation processes have played a major role in our current understanding of how species evolved on our planet. Since the original proposal of the theory of evolution by natural ...

    The bathyal connections between the Mediterranean Sea and the Northeastern Atlantic Ocean: An assessment using deep-water sponges as a case study 

    Sitjà Poch, Cèlia (Date of defense: 2020-11-05)

    The general outline of this thesis was to assess the potential of the Mediterranean water masses to transport deep-sea fauna towards the Atlantic Ocean. By examining the effects that the bathyal water mases moving from the ...

    The role of leaf litter quality and streambed hydro-morphology on in-stream leaf litter dynamics = El rol de la qualitat de la fullaraca i de la hidro-morfologia del tram fluvial en les dinàmiques de la fullaraca als rierols 

    Bastias Álamo, Elliot (Date of defense: 2018-04-11)

    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 ...

    The role of non-native fish on littoral macroinvertebrates of Pyrenean high mountain lakes 

    Osorio Álvarez, Víctor (Date of defense: 2024-02-06)

    [eng] High mountain freshwater ecosystems, such as Pyrenean lakes, are distinguished by their unique ecological characteristics, which encompass their near-pristine undisturbed state, unique biodiversity, and their role ...

    Thermal adaptation of amphibians in tropical mountains: consequences of global warming = Adaptaciones térmicas de anfibios en montañas tropicales: consecuencias del calentamiento global = Adaptacions tèrmiques d’amfibis en muntanyes tropicals: conseqüències de l’escalfament global 

    Pintanel Costa, Pol (Date of defense: 2018-11-26)

    Temperature is likely to be one of the most important abiotic factors given how it affects the physiology of the whole organism and as a consequence, it has an essential role in ecology and evolution. However, how the ...

    Towards a more sustainable management of temporary rivers: tools for improving their conservation, biomonitoring and social recognition 

    Soria Extremera, Maria (Date of defense: 2021-05-07)

    Temporary rivers (TRs) are dynamic systems that typically shift between flowing, disconnected-pools and dry phases, and represent nearly 50% of the current global river network. Despite TRs support several unique and endemic ...

    Towards disentangling the genetic complexity and clinical heterogeneity of psychotic disorders: from family-based approaches to gene-environment studies 

    Soler Garcia, Jordi (Date of defense: 2021-07-13)

    Psychotic disorders are psychiatric conditions with a worldwide prevalence of around 4% and a tremendous personal, economic and social burden. As complex phenotypes, psychotic disorders are caused by multiple genetic ...

    Tracking historical changes in the trophic ecology of the green turtle "Chelonia mydas" in the Hawaiian Islands 

    Velasquez Vacca, Adriana (Date of defense: 2023-03-21)

    [eng] Hawaiian green turtles Chelonia mydas were heavily exploited for their fat, meat and eggs by the Polynesians in the pre-contact era and continued to be commercially exploited until 1978 when they were officially ...

    Tree-ring networks at multiple geographical scales: patterns of coordinated ecological responses to global warming = Xarxes d'anells de creixement en arbres a escales geogràfiques múltiples: patrons de respostes ecològiques coordinades en front a l'escalfament global 

    Shestakova, Tatiana A. (Date of defense: 2016-11-11)

    Forest biomes are major reserves for terrestrial carbon and thus small shifts in the carbon balance of forests could have a large impact on the global carbon cycle. In spite of unambiguous evidence pointing to climate ...

    Trophic ecology of sharks and rays in exploited ecosystems of northwestern Mediterranean = Ecología trófica de tiburones y rayas en ecosistemas explotados del Meditérraneo noroccidental 

    Barría Oyarzo, Claudio (Date of defense: 2017-09-12)

    In this thesis, the ecological role of 26 species of abundant, rare and endangered chondrichthyans present in the western Mediterranean has been studied through the study of trophic ecology and main morphological characters. ...

    Una aproximación a la integración de escalas ecológicas para la restauración de ecosistemas de manglar 

    Teutli Hernández, Claudia (Date of defense: 2017-09-14)

    En los últimos años los proyectos de restauración se han incrementado por todo el mundo, particularmente los de manglares degradados, pero no se dispone de información suficiente sobre el grado de éxito de las acciones ...

    Understanding migration of pelagic seabirds with stable isotopes and geolocation 

    Neto Militao, Teresa Afonso (Date of defense: 2016-10-07)

    Animal migration is an amazing widespread phenomenon that forms an essential component of the animal life history. Animals usually migrate to take advantages of changes in resource availability in space and time or to find ...

    Understanding resilience through biodiversity: developing systemic tools for marine conservation in temperate rocky reefs 

    Sanabria Fernández, José Antonio (Date of defense: 2021-01-13)

    The degradation of natural diversity results in the erosion of key systemic properties such as resilience, or the capacity to recover from disturbances. Resilience loss leads to an increase in the fragility and vulnerability ...

    Variety improvement in rice (Oryza sativa L.): proteomic, hormonal and in vitro studies 

    López Cristoffanini, Camilo Alonso (Date of defense: 2019-03-11)

    Rice (Oryza sativa L.) is without doubt one of the major crops worldwide, as its consumption is continuously increasing, especially in low- and lower-middle-income countries where it is the most important staple. This ...

    Viabilitat demogràfica i efecte dels canvis ambientals antropogènics en la distribució, dieta i condició física d'una població d'aufrany Neophron percnopterus en expansió = Demographic viability and effect of anthropogenic environmental changes in the distribution, diet and body condition of an expanding population of Egyptian Vulture Neophron percnopterus 

    Tauler Ametller, Helena (Date of defense: 2018-06-14)

    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 ...

    Vida post-collita i millora de la qualitat en fruits climatèrics: estudi en alvocats 'Bacon' (Persea americana Mill. cv. Bacon) 

    Vincent Sánchez, Celia (Date of defense: 2022-04-08)

    Els fruits climatèrics es caracteritzen per un procés de maduració comercial estretament vinculat a la producció d’etilè, que comporta la maduració i sobre- maduració del fruit al llarg de la cadena de producció, tot portant ...

    Vitamina E: ubiqüitat tissular i relació amb els jasmonats, claus de la interacció entre la resposta a l'estrès abiòtic i biòtic en plantes 

    Casadesús Cabral, Andrea (Date of defense: 2022-09-19)

    Tots els organismes fotosintètics són capaços de sintetitzar vitamina E, la qual s’acumula de forma ubiqua en els teixits vegetals, tant en els fotosintètics com en els no fotosintètics. Mentre que la vitamina E és un ...

    Vulnerabilidad a la sequía de la especie de alta montaña Saxifraga longifolia 

    Cotado Pinilla, Alba (Date of defense: 2019-10-31)

    Los ecosistemas de alta montaña son puntos calientes de biodiversidad, ya que proporcionan hábitats que albergan una gran variedad de especies únicas. El clima por encima del límite forestal se caracteriza por tener ...