Feeding ecology and trophic position of three sympatric demersal chondrichthyans in the Northwestern Mediterranean.

Understanding how marine predators interact is a scientific challenge. In marine ecosystems, segregation in feeding habits has been largely described as a common mechanism to allow the coexistence of several competing marine predators. However, little is known about the feeding ecology of most species of chondrichthyans, which play a pivotal role in the structure of marine food webs worldwide. In this study, we examined the trophic ecology of 3 relatively abundant chondrichthyans coexisting in the Mediterranean Sea: the blackmouth catshark Galeus melastomus , the velvet belly lanternshark Etmopterus spinax and the rabbit fish Chimaera monstrosa. To examine their trophic ecology and interspecific differences in food habits, we combined the analysis of stomach content and stable isotopes. Our results highlighted a trophic segregation between C. monstrosa and the other 2 species. G. melastomus showed a diet composed mainly of cephalopods, while E. spinax preyed mainly on shrimps and C. monstrosa on crabs. Interspecific differences in the trophic niche were likely due to different feeding capabilities and body size. Each species showed different isotopic niche space and trophic level. Specifically, C. monstrosa showed a higher trophic level than E. spinax and G. melastomus. The high trophic levels of the 3 species highlighted their important role as predators in the marine food web. Our results illustrate the utility of using complementary approaches that provide information about the feeding behaviour at short (stomach content) and long-term scales (stable isotopes), which could allow more efficient monitoring of marine food-web changes in the study area.

Biochemical differentiation between Ophidion Barbatum and o. Rochei (Pisces, Ophidiidae)

El gènere Ophidion esta representat al Mediterrani per dues espècies, 0. barbatum L. i O.rochei Müller. Són dues espècies molt similars en aspecte i difícils d'identificar només apartir dels seus caràcters morfològics externs. El treball descriu en primer lloc, i a partir de dades obtingudes per tècniques electroforètiques, alguns marcadors bioquímics que permetendiferenciar les dues espècies. En segon lloc, i a partir del càlcul de la 'Distància Genèticade Nei', es fa una estimació del temps de divergència entre O. barbatum i 0. rochei

Wages and productivity: the role of labour market institutions in OECD countries

In the context of a monetary union, to keep a territorial equilibrium in terms of economic activity and employment, the relationship between real wages and productivity is crucial. In this paper, empirical evidence about the response of wages to productivity is obtained for 20 OECD countries and the role of labour market institutions to explain differences in this response is analysed.

Zonation patterns of benthic communities in an upwelling area from de western Mediterranean (La Herradura, Alboran Sea)

Species composition and distribution of marine benthic communities from La Herradura (Alboran Sea, western Mediterranean) are described to characterise its rocky and sedimentary bottoms bionomically. Rocky bottoms were studied by means of several underwater transects and soft bottoms with fixed stations along a bathymetric gradient. The study of the floristic and faunistic composition of the rocky benthic communities highlights depth as the main axis of variation. Factorial Correspondence Analysis segregates deep-water communities below 25 m depth (circalittoral communities) from shallower communities (axis I), and communities thriving between 5 and 25 m depth (lower infralittoral communities) from communities thriving close to the surface (shallow infralittoral communities) (axis II). The study of the sedimentary bottoms also suggests that depth, together with physical sedimentary properties, is the main axis of variation in species distribution. Floristic and faunistic records show the particular composition of La Herradura benthic communities, compared to Mediterranean and Atlantic ones. Mixing of Mediterranean and Atlantic waters, together with deep water upwelling episodes typical of this area, probably determine the peculiar composition of the benthic communities

Geographical Distribution, Habitat and Reproductive Phenology of the Genus Kallymenia (Gigartinales, Rhodophyta) from Catalonia, Spain

Geographical distribution, habitat and reproductive phenology of the Genus Kallymenia (Gigartinales, Rhodophyta) from Catalonia, Spain

Treinta años de cooperación al desarrollo en España: análisis de la continuidad y cambio en las políticas públicas

A partir del análisis de la red de actores (policy network) y de la teoría del equilibrio interrumpido desarrollado por Baumgartner y Jones (1993), en este trabajo se analiza el caso de la política de cooperación al desarrollo de España desde la transición democrática hasta el presente. El objetivo es analizar la continuidad y cambio de esta política desde la perspectiva del análisis de las políticas públicas. Se demuestra que, al igual que en otros casos, la estabilidad más que el cambio caracteriza su evolución. Al mismo tiempo, se señala que las características propias del subsistema político de la cooperación al desarrollo afectan la magnitud y la frecuencia de los cambios en la política.

Combining genetic and demographic data for the conservation of a Mediterranean habitat-forming species

The integration of ecological and evolutionary data is highly valuable for conservation planning. However, it has been rarely used in the marine realm, where the adequate design of marine protected areas (MPAs) is urgently needed. Here, we examined the interacting processes underlying the patterns of genetic structure and demographic strucuture of a highly vulnerable Mediterranean habitat-forming species (i.e. Paramuricea clavata (Risso, 1826)), with particular emphasis on the processes of contemporary dispersal, genetic drift, and colonization of a new population. Isolation by distance and genetic discontinuities were found, and three genetic clusters were detected; each submitted to variations in the relative impact of drift and gene flow. No founder effect was found in the new population. The interplay of ecology and evolution revealed that drift is strongly impacting the smallest, most isolated populations, where partial mortality of individuals was highest. Moreover, the eco-evolutionary analyses entailed important conservation implications for P. clavata. Our study supports the inclusion of habitat-forming organisms in the design of MPAs and highlights the need to account for genetic drift in the development of MPAs. Moreover, it reinforces the importance of integrating genetic and demographic data in marine conservation.

Effects of the sewage pollution in the structure and dynamics of the community of Cystoseira mediterranea (Fucales, Phaeophyceae)

We performed a study on the specific composition, structure, and dynamics of two Cystoseira mediterranea communities from the north-western Mediterranean submitted to different degrees of pollution. The structural complexity (species richness, specific distribution, and species and pattern diversity) and biomass production were lower in the polluted site. In this station, opportunistic algae (mainly Ulva rigida) loomed, and Mesophyllum lichenoides and some encrusting brown algae increased their cover. Other species (Jania rubens, and some Ceramiales) decreased their abundance when compared with the polluted site

Tecnología para el desarrollo humano: agua e infraestructura

Peer Reviewed

Health and reproduction of red mullet, Mullus barbatus, in the western Mediterranean Sea

The reproductive and general health of exploited fish stocks is an essential element of sustainable and profitable fisheries. The main purpose of this study was to assess the relationships between reproduction and two important parameters of fish health (parasitism and energy reserves) in female specimens of red mullet, Mullus barbatus, from the western Mediterranean Sea. We present new data for this species on (i) the prevalence and intensity of infection by metazoan parasites; (ii) the total lipid content in muscle and gonads as a measure of condition and (iii) fecundity and egg quality as a measure of their reproductive capacity. The results show that M. barbatus is a batch spawner with an income breeding strategy, an asynchronous development of oocytes and indeterminate fecundity. The results also indicate that the three most abundant and prevalent parasites significantly affect the condition and reproduction of M. barbatus. Specifically, the digenean, Opecoeloides furcatus, causes a reduction in the female"s energy reserves, while the nematodes, Hysterothylacium fabri and H. aduncum, produce a rise in egg production but impair egg quality. These implications of the relationships between parasitism, fish health and fish reproduction should be taken into consideration in the assessment and management of exploited species

B.A. Creixent: projecte de cooperació intermunicipal pel desenvolupament del Banc d’Aliments de Sant Pol de Mar

B.A. Creixent és un projecte que té la missió de crear una dinàmica cooperativa entre el Banc d’Aliments Municipal de Sant Pol de Mar, els comerços de la localitat i l’IES Bisbe de Sevilla de Calella, amb la finalitat d’ampliar els recursos del propi Banc

Un Possible encaix de l’Euroregió Pirineus-Mediterrània en la figura de l’Agrupació Europea de Cooperació Territorial

Avui dia parlar de l’Euroregió i de les seves capacitats per optimitzar el nivell de cooperació no és estrany al mon del dret, però no sempre ha estat així. Ha calgut l’experiència positiva de diverses entitats regionals i locals d’arreu d’Europa per començar a reconèixer la importància d’aquest fenomen. Les regions europees havien iniciat diverses actuacions, algunes d'elles als inicis dels seixanta, amb l'objectiu de desenvolupar interessos comuns tractant que les fronteres estatals no suposessin una barrera insuperable. Estructures tal com l'Associació de Regions Frontereres Europees (ARFE), creada el 1969, o les accions dutes a terme per entitats territorials del denominat Arc Alpí (ARGE-ALP, ALPE-ADRIA i COTRAO) van constituir uns dels primers exemples de col·laboració permanent en el continent europeu. Així doncs, si bé a partir dels anys setanta (per posar una data orientativa) s’estengué la col·laboració d’entitats regionals i locals europees no va ser fins a la dècada dels noranta quan aquesta es va consolidar, sobretot pel llançament de les iniciatives comunitàries INTERREG que suposaren un recolzament econòmic a les actuacions empreses des dels seus organismes de cooperació

Congrés Internacional: "De la dictadura a la democràcia : les dones en l'Europa mediterrània, central i de l'est"

El mes de setembre de 1993, el departament d'Història Contemporània de la Universitat de Barcelona i l'european Network for Women's Studies (ENWS) del Consell d'Europa van organitzar el congrés internacional "De la dictadura a la democràcia: les dones en l'Europa mediterrània central i de l'est". Lóbjectiu del congrés va ser desenvolupar una reflexió entorn de la trajectòria de les dones en les crisis dels antics règims dictatorials i en la transició democràtica.