Mostrando ítems 123-142 de 147
Martínez Abraín, Alejandro (Fecha de defensa: 2003-03-28)
This thesis includes several research works on population dynamics and conservation of seabirds in two small islands of the western Mediterranean: the Columbretes Islands (Castellón) and the island of Benidorm (Alicante). ...
Molina Vacas, Guillem (Fecha de defensa: 2011-03-04)
L’objectiu d’aquesta tesi és avançar en el coneixement de l’ús que els meso-mamífers fan del paisatge mediterrani amb diferents nivells d’urbanització i de quina manera les variacions en aquest s’associen a variacions en ...
Tornero Álvarez, María Victoria (Fecha de defensa: 2004-12-17)
Los retinoides, también conocidos como vitamina A, son compuestos esenciales para muchas funciones biológicas. Los retinoides se clasifican entre los biomarcadores apropiados para el control de los contaminantes ambientales ...
Ros-Farré, Palmira (Fecha de defensa: 2012-10-26)
Aquesta tesi es centra en l’estudi taxonòmic d’algunes subfamílies d’himenòpters parasitoids, aquestes pertanyen a la superfamília Cynipoidea, família Figitidae. S’ha estudiat la taxonomia de dues subfamílies (Aspicerinae ...
Cerro i Ramon, Lluís del (Fecha de defensa: 1997-09-10)
El present treball parteix de la base d'estudi dels exemplars de la Família Triglidae capturats dintre del Programa de Recerca anomenat Fundaments for the Restructuration of the Demersal Fisheries in the Pacific Mexican ...
Gordo Villoslada, Óscar (Fecha de defensa: 2006-12-01)
The spatial and temporal variability of migratory phenology of <i>Ciconia ciconia, Cuculus canorus, Apus apus, Hirundo rustica</i> and <i>Luscinia megarhynchos</i> were studied by means of 44000 records for 1400 spanish ...
Esteve Cavaller, Manuel (Fecha de defensa: 2005-02-25)
Long-term data from underwater video recordings in the wild and in semi-natural channels are used to describe and compare the reproductive behaviour of fishes in the Salmoninae subfamily. The thesis is divided into five ...
Richter Boix, Alex (Fecha de defensa: 2006-01-20)
The thesis research concerned evolutionary ecology and community ecology of amphibians in two different areas of a Mediterranean region. The goal of the research was to test how anuran species coexist along a lentic ...
Guallar, Santi (Fecha de defensa: 2021-04-09)
Molt is the process of plumage renewal by which birds maintain and adjust its functionality throughout their lifecycle. Multiple elements have been tackled in bird molt research (timing, duration, sequence, intensity, ...
Stegun Vidigal, Vera Cristina (Fecha de defensa: 2015-01-21)
The short-tailed opossums of the genus Monodelphis Burnett, 1830 are small-bodied semifossorial marsupials which inhabit almost all major biomes of South America up to 2200 m. Even though it is one of the most speciose ...
Cebrian Pujol, Emma (Fecha de defensa: 2007-04-20)
Many antrophic activities release pollutants to the marine environment. Among them heavy metals are of great importance, since they are conservative pollutants, which can be accumulated through trophy chains. Sometimes, ...
Ávila Escartín, Conxita (Fecha de defensa: 1993-05-10)
Los Moluscos Opistobranquios, en relación a la reducción o incluso pérdida de la concha, han desarrollado múltiples y sofisticados métodos de defensa (incluyendo la defensa química) que les han permitido sobrevivir sin ...
Morais Pinela, Ana (Fecha de defensa: 2015-07-15)
Distinguishing population units of small cetaceans continuously distributed in a widespread area is challenging, but critical for their conservation and management. The common dolphin (genus Delphinus) has a wide distribution ...
Motis Berta, Anna (Fecha de defensa: 1994-03-01)
En la present memòria s'analitzaran els aspectes que fan referència a les relacions territorials intra/interspecífiques de "Sturnus vulgaris" i "Sturnus unicolor", i les seves conseqüències en el marc reproductor. D'una ...
Mateos González, Fernando (Fecha de defensa: 2012-09-07)
El uso de señales múltiples de calidad es común en numerosas especies, pero este hecho no es fácil de explicar. Las presiones fluctuantes del ambiente podrían tener un rol importante en el origen y mantenimiento de las ...
Arias Martorell, Júlia (Fecha de defensa: 2014-12-05)
The Doctoral Thesis entitled "the glenohumeral joint of hominoid primates: locomotor Correlates, anatomical variation and evolution" is about the anatomical adaptations in the shoulder joint (glenohumeral joint) of hominoid ...
Martínez Salmeron, Debora (Fecha de defensa: 2014-07-15)
Over time, many studies about deer antlers, based on classical morphometry, have been done. The present study propose a new perspective on the study of Iberian red deer antlers (Cervus elaphus hispanicus) from Sierra Morena ...
García-Tarrasón, Manuel (Fecha de defensa: 2014-12-19)
The results presented in this thesis have shown the strong dependence of Audouin’s gull from the Ebro Delta on fisheries. Foraging movements of breeding birds showed a great association with fishing activities (specially ...
Vighi, Morgana (Fecha de defensa: 2016-01-19)
Cetaceans have historically been object of heavy exploitation, and are still currently subject to different threats. For conservation and management purposes, most of the large cetacean populations have been categorized ...
Ponjoan Thäns, Anna (Fecha de defensa: 2012-12-14)
El sisó (Tetrax tetrax) és un ocell estepari que a Europa ocupa principalment ambients agrícoles i està en declivi poblacional a causa, principalment, de la intensificació agrícola. En aquesta tesi s’analitzen aspectes poc ...