Now showing items 131-147 of 147
Guallar, Santi (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 (Date of defense: 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 ...
Nova Delgado, Mónica Constanza (Date of defense: 2015-12-01)
Desde diferentes enfoques, los primates platirrinos son uno de los grupos más discutidos y debatidos. La dificultad en la comprensión de las interrelaciones a nivel familiar, la posición del género Aotus, la relación con ...
González Pérez, Emili (Date of defense: 2009-12-17)
La família d'elements genètics Alu recents són insercions polimòrfiques disperses pel genoma humà. Les seves propietats com a marcadors neutres, amb estat ancestral conegut i identitat per descendència permeten, conjuntament ...
Carreras Torres, Robert (Date of defense: 2014-06-20)
La diversitat observada en els grups humans ha estat àmpliament documentada per antropòlegs segons els coneixements i tècniques disponibles en cada moment. Actualment, un dels aspectes en els quals s’està invertint molt ...
Via i García, Marc (Date of defense: 2006-07-24)
Les malalties complexes conformen en l'actualitat la principal causa de mortalitat en les societats occidentals. D'entre elles, destaquen les malalties cardiovasculars per la seva elevada incidència tot i mostrar diferències ...
Brotons, Lluís (Date of defense: 2000-02-03)
The main objective of this thesis is to analyse the variation in non-breeding social systems within the group of parids and to identify the main factors involved. More specifically, I studied the role of food hoarding on ...