http://hdl.handle.net/10256/1536 2013-05-21T00:50:54Z 2013-05-21T00:50:54Z Aparicio, Enric Pintor, Cristina Duran, Concha Carmona-Catot, Gerard http://hdl.handle.net/10256/7833 2013-05-10T00:00:38Z 2012-01-01T00:00:00Z

Fish passage assessment at the most downstream barrier of the Ebro River (NE Iberian Peninsula) Aparicio, Enric; Pintor, Cristina; Duran, Concha; Carmona-Catot, Gerard Fish passage at artificial barriers is necessary for the conservation of healthy fish stocks. The first barrier that migratory fish encounter when ascending the Ebro River is the Xerta Weir, where a pool-type fishway was constructed in 2008. From 2007 to 2010, boat electrofishing surveys were conducted in the Ebro River downstream of the Xerta Weir to assess the potential pool of species that could use the fishway. Nine native and 12 exotic species were captured, the latter comprising 62 % of the relative abundance and 70 % of the biomass. A combination of video recording, electrofishing and trapping was used to assess the effectiveness of the fishway in facilitating the passage of fish. Eight species were detected using the fishway, of which five were native (Liza ramada, Anguilla anguilla, Barbus graellsii, Gobio lozanoi and Salaria fluviatilis) and three exotic (Alburnus alburnus, Cyprinus carpio and Rutilus rutilus). Only L. ramada used the fishway in substantial numbers. The rate of fish passage was the highest from June to August and decreased afterwards. The effectiveness of the fishway might be lowered by areas of turbulence within the fishway and by distraction flows from a nearby hydropower station; El paso de peces a través de barreras artificiales es necesario para la conservación en buen estado de las poblaciones de peces. La primera barrera que los peces migratorios encuentran ascendiendo el Río Ebro es el Azud de Xerta, donde en 2008 se construyó una escala de peces del tipo de estanques sucesivos. Para determinar el conjunto de especies que potencialmente podrían usar la escala se llevaron a cabo muestreos mediante pesca eléctrica desde embarcación aguas abajo del azud. Nueve especies nativas y 12 exóticas fueron capturadas, representando estas últimas el 62 % de la abundancia relativa y el 70 % de la biomasa. Se usó una combinación de grabaciones de video, pesca eléctrica y trampeo para evaluar la efectividad de la escala de peces. Ocho especies fueron detectadas en la escala, de las cuales cinco eran nativas (Liza ramada, Anguilla anguilla, Barbus graellsii, Gobio lozanoi y Salaria fluviatilis) y tres exóticas (Alburnus alburnus, Cyprinus carpio y Rutilus rutilus). Sólo L. ramada usó la escala en un número destacado. La tasa de paso de peces fue más alta de Junio a Agosto y descendió posteriormente. La efectividad de la escala puede estar limitada por áreas de turbulencia dentro de la escala y caudales de distracción desde una central hidroeléctrica cercana

2012-01-01T00:00:00Z Brucet Balmaña, Sandra Compte Ciurana, Jordi Boix Masafret, Dani López Flores, Rocío Quintana Pou, Xavier http://hdl.handle.net/10256/7832 2013-05-10T00:00:36Z 2008-02-01T00:00:00Z

Feeding of nauplii, copepodites and adults of Calanipeda aquaedulcis (Calanoida) in Mediterranean salt marshes Brucet Balmaña, Sandra; Compte Ciurana, Jordi; Boix Masafret, Dani; López Flores, Rocío; Quintana Pou, Xavier Feeding of the different developmental stages of Calanipeda aquaedulcis on natural particles (bacterio-, phyto- and microzooplankton) was measured in a Mediterranean salt marsh (Empordà wetlands, NE Iberian Peninsula). Bottle incubations were performed in the field both in autumn and spring. The results showed differences in the diet of the different developmental stages due to both prey type and size. In general, the size of the ingested prey increased with increasing size of the C. aquaedulcis stage. While C. aquaedulcis adults had high ingestion rates and selection coefficients for large prey (micro- and nanoplankton), nauplii preferentially consumed smaller prey items (picoplankton). Copepodites showed the widest prey size range, including pico-, nano- and microplankton. Nevertheless, the lower size limit for particle capture was similar for all stages, i.e. between 1.7 and 2.1 μm. Omnivory was observed in all stages of C. aquaedulcis. Heterotrophic prey (picoplankton, dinoflagellates and ciliates) were the most ingested items. The ability to partition the available food among the different developmental stages could represent an advantage in times of ood scarcity because it may reduce intraspecific competition. This may explain how C. aquaedulcis is able to predominate in the zooplankton community for several weeks during spring and summer ven in situations of low food availability

2008-02-01T00:00:00Z Roura i Pascual, Núria Pons Ferran, Pere Etienne, Michel Lambert, Bernard http://hdl.handle.net/10256/7830 2013-05-09T00:00:47Z 2005-08-01T00:00:00Z

Transformation of a Rural Landscape in the Eastern Pyrenees Between 1953 and 2000 Roura i Pascual, Núria; Pons Ferran, Pere; Etienne, Michel; Lambert, Bernard In the mid-20th century, the southern parts of the Madres and Mont Coronat massif (Eastern Pyrenees, France) were characterized by a Mediterranean landscape shaped by human activity. Long-term use of these mountains for crops, livestock, and forestry led to an increase in grassland areas at the expense of forest. However, socioeconomic transformation (abandonment of agriculture and a decrease in the rural population) in recent decades has caused profound changes in this massif. Interpretation of aerial photographs (1953, 1969, 1988, and 2000) made it possible to detect and analyze the changes produced in the study area (6787 ha) during this period. In 1953 most of the massif landscape consisted of grasslands (38%) and open forests (18%), with some areas of dense forest (15%). By 2000, dense forest cover had doubled in size (31%), and grassland had decreased considerably (by 73% of the initial area). Since 1953, the study area has become more homogeneous, with a few local exceptions. The results of this study suggest that socioeconomic factors might be the main cause of landscape transformations in this period of approximately 50 years.

2005-08-01T00:00:00Z Polo Albertí, Lluís http://hdl.handle.net/10256/7829 2013-05-09T00:00:47Z 1986-01-01T00:00:00Z

Vegetació dels aiguamolls Polo Albertí, Lluís Aquest escrit es refereix a la vegetació dels Aiguamolls del Baix Empordà, concretament als aiguamolls de la platja de Pals, sense entrar en detalls d'altres zones humides situades mes lluny de la línia de costa. Els indrets més significatius són el Ter Vell, la Platera (T. M. de Torroella de Montgrí), la Fonollera i les Basses d'en Coll (T. M. de Pals), que presenten diferencies apreciables en el seu poblament vegetal

1986-01-01T00:00:00Z Font Garcia, Joan Vilar Sais, Lluís Gesti Perich, Josep Viñas i Teixidor, Xavier http://hdl.handle.net/10256/7828 2013-05-09T00:00:46Z 1998-01-01T00:00:00Z

Els últims prats de dall a la terra baixa gironina Font Garcia, Joan; Vilar Sais, Lluís; Gesti Perich, Josep; Viñas i Teixidor, Xavier Article on es descriu la distribució geogràfica i les característiques del poblament vegetal dels prats de dall de les comarques gironines

1998-01-01T00:00:00Z Vilar Sais, Lluís Font Garcia, Joan http://hdl.handle.net/10256/7826 2013-05-09T00:00:45Z 1995-01-01T00:00:00Z

El projecte Hàbitat a les comarques de Girona Vilar Sais, Lluís; Font Garcia, Joan Descripció del Projecte Hàbitat, consistent en inventariar els hàbitats existents a les comarques de Girona

1995-01-01T00:00:00Z Font Garcia, Joan Vilar Sais, Lluís http://hdl.handle.net/10256/7825 2013-05-09T00:00:45Z 2000-01-01T00:00:00Z

Les plantes exòtiques o al·lòctones : de fora vingueres i ... Font Garcia, Joan; Vilar Sais, Lluís Article que tracte de la introducció i expansió de les plantes al·lòctones o exòtiques al nostre país

2000-01-01T00:00:00Z Font Garcia, Joan Campos i Llach, Miquel Vilar Sais, Lluís Polo Albertí, Lluís http://hdl.handle.net/10256/7823 2013-05-09T00:00:43Z 1996-01-01T00:00:00Z

HGI, l' herbari de la Universitat de Girona Font Garcia, Joan; Campos i Llach, Miquel; Vilar Sais, Lluís; Polo Albertí, Lluís Descripció de l'herbari de la Universitat de Girona, fundat l'any 1976 pel Dr. Lluís Polo

1996-01-01T00:00:00Z Polo Albertí, Lluís http://hdl.handle.net/10256/7821 2013-05-09T00:00:41Z 1987-01-01T00:00:00Z

La flora i la vegetació Polo Albertí, Lluís Descripció de la flora i vegetació de les Gavarres

1987-01-01T00:00:00Z Vilar Sais, Lluís Font Garcia, Joan Polo Albertí, Lluís http://hdl.handle.net/10256/7819 2013-05-09T00:00:40Z 1994-01-01T00:00:00Z

Les dunes litorals, un paisatge singular en regressió Vilar Sais, Lluís; Font Garcia, Joan; Polo Albertí, Lluís Escrit que vol donar a conèixer el medi dunar litoral amb l’objectiu de recomanar la seva protecció urgent

1994-01-01T00:00:00Z