Departament de Ciències Ambientals: Envíos recientes
Mostrando ítems 41-60 de 79
Macroalgal-dominated coastal detritic bottoms of the Mediterranean Sea and the Northeastern Atlantic: description, distribution and sampling methodologies
En aquesta tesi es van descriure els principals fons algals del detrític costaner de la plataforma continental de Mallorca i Menorca (illes Balears, Espanya), i es van proposar mètodes efectius per al seu mostreig tant a ...
Effects of parasitism on the condition and reproductive capacity of three commercially exploited fish species in the Mediterranean Sea
This PhD thesis evaluates the links between parasitism, condition and reproduction of mature female individuals of three of the most captured fish species in the western Mediterranean Sea: European hake, Merluccius merluccius; ...
Towards the implementation of ecosystem management: a multi-level assessment of a small scale Mediterranean multi-specific fishery
Fisheries are complex systems, in which the process of assessment and management should explicitly consider the ecological, social and economic attributes of the system. For a responsible and sustainable management of ...
Climate change and the expansion of thermophilic fishes in the northwestern Mediterranean: the importance of studying condition and reproduction to understand the increase in their abundance
A direct consequence of sea warming in the Mediterranean is a increase in the abundance of thermo-tolerant species fish species such as Sphyraena viridensis, Pomadasys incisus, Pomatomus saltatrix and Trachinotus ovatus. ...
Linking river sediment physical properties to biofilm biomass and activity
River sediments are composed by a variety of grain sizes which determine their permeability and biogeochemistry. The aim of this thesis was to test whether differences in river sediment physical characteristics generate ...
Impactes biològics i característiques socioeconòmiques de la pesca recreativa a les àrees marines protegides de la Mediterrània: implicacions per a la gestió del medi marí
La pesca recreativa és una de les activitats turístiques més practicades a les zones costaneres arreu del món, implicant a un gran nombre de persones i per tant una pressió sobre els recursos gens menyspreable, especialment ...
Leaf litter decomposition in Mediterranean streams: microbial processes and responses to drought under current global change scenario
This thesis studied the principal environmental controlling factors and microbial mechanisms involved in leaf litter decomposition in Mediterranean intermittent streams. Additionally, drought disturbance in both Mediterranean ...
Reproducció i desenvolupament de la mallerenga blava (Cyanistes caeruleus): conseqüències de la invasió de la formiga argentina (Linepithema humile) en la xarxa tròfica del bosc mediterrani
We investigated whether the Argentine ant (Linepithema humile) invasion modifies the trophic web of the sclerophyllous Mediterranean forests to the point that impacts co-occurring bird communities. We studied if the invaded ...
Nitrate groundwater pollution and aquifer vulnerability: the case of the Osona region
Nitrate groundwater pollution in the Osona region is a persistent and widespread problem. Nitrate concentrations are commonly above the drinking water threshold of 50 mg/L in wells and springs. ANOVA and logistic regression ...
Ecological and biological strategies taken by the Argentine ant, Linepithema humile (Mayr, 1868), in cold seasons. Effects of winter nests management in natural invaded areas
The winter nesting behaviour of the Argentine ant seems to be intrinsic, and its success as an invasive species does not rely on a shift in social organization, nor on a shift in its mode of nesting associated with the ...
How Mediterranean plant species are able to cope with increasing levels of UV-B radiation and drought in the context of climate change?
Climatic models predict higher fluxes of UV-B radiation and a decrease in summer precipitation in the near future for the Mediterranean region. The UV radiation can be an oxidative stress factor for plants affecting their ...
Antioxidant enzyme activities in fluvial biofilms as biomakers of metal pollution
The present thesis aims to evaluate the use of antioxidant enzyme activities (AEA) of biofilm communities as biomarkers of metal pollution (mainly Zn) in fluvial ecosystems. In order to test AEA as biomarkers of metal ...
The invasion of the Argentine ant Linepithema humile in Mediterranean ecosystems: impacts and efficacy of winter aggregations extirpation as a control methods
We studied the characteristics and effects of the Argentine ant invasion on the native ants and other arthropods. Moreover, we assessed the effects of L. humile winter nest aggregations extirpation on its population dynamics. ...
Ecologia alimentària de la comunitat de peixos de l'Estany de Banyoles
Before 1910, the fish assemblage of Banyoles Lake (Catalonia, Spain) consisted of: eel (Anguilla anguilla), Mediterranean barbel (Barbus meridionalis), freshwater blenny (Bennius fluviatilis), three-spined stickleback ...
Sistema radicular de Quercus suber: estructura i desenvolupament
This thesis is a study of the structure and development of the young radicular system of Quercus suber. The work is focused on the sprouting capacity of the radicular system of the seedling, the development and organization ...
Fluctuacions a la maresma dels Aiguamolls de l'Empordà i estructura de la comunitat biològica
In this study the principal disturbance factors of the Empordà saltmarsh and their influence on water composition, and on plankton community structure and composition are analyzed. The importance of the turnover rate is ...
Evaluación de la remoción de semillas por roedores y hormigas en pinares mediterráneos afectados por incendios forestales
This study was conducted in burned and harvested areas of Catalonia. It was evaluated the effect of the granivorous in predispersive fruit removal of Smilax aspera and Quercus coccifera and postdispersive seed removal. ...
The use of pulse amplitude modulated fluorescence techniques for metal toxicity assessment in fluvial biofilms
Metal pollution in rivers is in great concern with human activities in the fluvial watershed. This thesis aims to investigate the potential use of chl-a fluorescence parameters as biomarkers of metal toxicity, and to find ...
L'efecte de la gestió forestal post-incendi sobre l'avifauna i la dispersió de llavors per ocells frugívors
The objective of this thesis is to analyze the effect of the transformation in the habitat that postfire salvage logging supposes on birds in Mediterranean pine forests, at different levels: species, community and ecosystem, ...
Distribution of diatom communities in agricultural and mining watersheds of Southwest Spain
Els sistemes aquàtics continental representen un dels ecosistemes més amenaçats a nivell mundial, com a conseqüència de l'ús intensiu quel'home en fa. La conca del Guadiana no està lliure d'aquestes pressions antròpiques. ...
