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Search Results: 1 - 10 of 326352 matches for " Henri Vallès "
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Parrotfish Size: A Simple yet Useful Alternative Indicator of Fishing Effects on Caribbean Reefs?
Henri Vallès, Hazel A. Oxenford
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0086291
Abstract: There is great need to identify simple yet reliable indicators of fishing effects within the multi-species, multi-gear, data-poor fisheries of the Caribbean. Here, we investigate links between fishing pressure and three simple fish metrics, i.e. average fish weight (an estimate of average individual fish size), fish density and fish biomass, derived from (1) the parrotfish family, a ubiquitous herbivore family across the Caribbean, and (2) three fish groups of “commercial” carnivores including snappers and groupers, which are widely-used as indicators of fishing effects. We hypothesize that, because most Caribbean reefs are being heavily fished, fish metrics derived from the less vulnerable parrotfish group would exhibit stronger relationships with fishing pressure on today’s Caribbean reefs than those derived from the highly vulnerable commercial fish groups. We used data from 348 Atlantic and Gulf Rapid Reef Assessment (AGRRA) reef-surveys across the Caribbean to assess relationships between two independent indices of fishing pressure (one derived from human population density data, the other from open to fishing versus protected status) and the three fish metrics derived from the four aforementioned fish groups. We found that, although two fish metrics, average parrotfish weight and combined biomass of selected commercial species, were consistently negatively linked to the indices of fishing pressure across the Caribbean, the parrotfish metric consistently outranked the latter in the strength of the relationship, thus supporting our hypothesis. Overall, our study highlights that (assemblage-level) average parrotfish size might be a useful alternative indicator of fishing effects over the typical conditions of most Caribbean shallow reefs: moderate-to-heavy levels of fishing and low abundance of highly valued commercial species.
Continuity and Rupture in the Growth of Cultures
Jaume Botey Vallès
Revista CIDOB d'Afers Internacionals , 1997,
Abstract: The first part of the article deals with the classical concepts of identity, diversity and pluralism in relation to present societies in conflict. The second part addresses specifically the case of the Andalusian immigration to Catalonia from 1955 to 1975 and the hardening relations and tensions between the two communities in present-day Catalonia. Finally, in the presence of economic globalization and the bolstered emergence of new identities, some of which have religious aspects as significant components, a proposition is put forth to find common ground in the new social movements and religious faith as two arenas of intercultural negotiation.
Representaciones y creencias en torno a la evaluación lingüística del adulto mayor con trastorno cognitivo leve
Beatriz Vallés
Revista de Investigación en Logopedia , 2011,
Abstract: Debido a los cambios demográficos que experimenta la población mundial cada día es más frecuente que los equipos de atención en el área de la logopedia deban atender adultos mayores con trastorno cognitivo leve (TCL), es decir, personas que presentan problemas en su memoria y otras funciones mentales, sin que los mismos interfieran con el desarrollo de sus actividades cotidianas (Speling et. al., 2011). Esta situación obliga a desarrollar acciones desde una nueva perspectiva epistemológica, ontológica y metodológica, especialmente en países en vías de desarrollo donde las personas mayores de 65 a os se pueden enfrentar al aislamiento y la falta de servicios de salud pública, producto de una serie de representaciones negativas en torno al envejecimiento que atentan sobre su calidad de vida y determinan que los programas de formación profesional del logopeda deban abordar temas relacionados con el envejecimiento como proceso complejo y multifactorial. El objetivo de este trabajo es analizar las representaciones sociales que deban ser consideradas a la hora de elaborar una propuesta de evaluación lingüística dirigida al adulto mayor con TCL desde una perspectiva discursiva que permita el estudio del componente pragmático. Se plantea como alternativa el uso del análisis de la conversación entre pacientes e interlocutores claves como herramienta diagnóstica y la incorporación a los programas de formación profesional en Logopedia de contenidos sobre Psiquiatría, Lingüística Clínica, Geriatría y Gerontología a fin de alcanzar una práctica ajustada a los complejos marcos sociales donde se desarrolla actualmente la práctica logopédica en países en desarrollo.
Dr. Oriol de Bolòs i Capdevila (1924-2007)
Vallès Xirau, Joan
Anales del Jardín Botánico de Madrid , 2007,
Abstract:
Rese a de "La frontera interior. El lugar de la nación en la teoría de la democracia y el federalismo" de R. Máiz
Josep M. Vallés
Araucaria , 2009,
Abstract:
Obituari: Miguel de Garganta i Fàbrega (Olot, 1903-1988)
Vallès Xirau, Joan
Collectanea Botanica , 1989,
Abstract:
Dades sobre la biologia d'espècies ibèrico-baleàriques d'Artemisia L.
Vallès Xirau, Joan
Collectanea Botanica , 1989,
Abstract: Not available [ca] S'estudien diversos aspectes de la biologia de les espècies ib èrico-baleàriques d'Artemisia L., fonamentalment de les seccions Artemisia L. i Seriphidium Besser. La germinació de les cipseles, el tipus de cicle biològic, la biologia de la reproducció i la fenologia són els principals termes tractats. [fr] On étude des aspects divers de la biologie des espèces ibéro-baléariques du genre Artemisia L., notamment des sections Artemisia L. et Seriphidium Besser. La germination des cypseles, le type du cycle biologique, la biologie de la reproduction et la phénologie sont les principaux points traités.
Variétés de type Togliatti
Jean Vallès
Mathematics , 2006,
Abstract: The Del Pezzo surface S\_6 obtained by blowing up the projective plane along three points (non aligned) has the following nice property : its osculating hyperplanes have a common point. For that reason S\_6 is also called Togliatti surface. In this paper we give two explanations of this fact. After what we obtain two different families of varieties with an analogous property.
à propos des variétés de Poncelet
Jean Vallès
Mathematics , 2013,
Abstract: We recall the definition of Poncelet varieties that generalize the celebrated Poncelet curves introduced by Darboux. We show that any quadric and any smooth cubic in the projective space of dimension three is a Poncelet surface but that a general surface of degree greater than four is not.
Fibrés vectoriels de rang deux sur $?^2$ provenant d'un revêtement double
Jean Vallès
Mathematics , 2008,
Abstract: Since Schwarzenberger and his celebrated paper called "Vector bundles on the projective plane" we know that any rank two vector bundle on $\P^2$ is a direct image of a line bundle on a double covering of the plane. This theorem suggests to study the rank two vector bundles according to the branch curve of the covering which they come from. Thus, in the first part we prove that, given a double covering ramified over an irreducible curve $C_{2r}$ with degree $2r$, the jumping lines of fixed order (order depending on $r$ and on the parity of the rank two vector bundle) of the direct images vector bundles are necessarely $r$-tangent to $C_{2r}$. In the second part we concentrate on the case $r=2$. Then we give a list of vector bundles for which the jumping lines are exactly the bitangent lines to the branch quartic.
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