Arrêt du Conseil d'Etat (lapidaires)

[Acte. 1614-12-16]

Evidence of an interannual effect of maternal immunization on the immune response of juveniles in a long-lived colonial bird.

Little is known about the maternal transfer of antibodies in natural host-parasite systems despite its possible evolutionary and ecological implications. In domestic animals, the maternal transfer of antibodies can enhance offspring survival via a temporary protection against parasites, but it can also interfere with the juvenile immune response to antigens. We tested the functional role of maternal antibodies in a natural population of a long-lived colonial seabird, the kittiwake (Rissa tridactyla), using a vaccine (Newcastle disease virus vaccine) to mimic parasite exposure combined with a cross-fostering design. We first investigated the role of prior maternal exposure on the interannual transmission of Ab to juveniles. We then tested the effect of these antibodies on the juvenile immune response to the same antigen. The results show that specific maternal antibodies were transferred to chicks 1 year after maternal exposure and that these antibodies were functional, i.e. they affected juvenile immunity. These results suggest that the role of maternal antibodies may depend on the timing and pattern of offspring exposure to parasites, along with the patterns of maternal exposure and the dynamics of her immune response. Overall, our approach underlines that although the transgenerational transfer of antibodies in natural populations is likely to have broad implications, the nature of these effects may vary dramatically among host-parasite systems, depending on the physiological mechanisms involved and the ecological context.

Thegioastrea multisepta (SISMONDA). Primer coralario colonial del Mioceno marino de Montjuich (Barcelona)

Se cita por primera vez el hallazgo de un coral colonia en Montjuich, Thegioastrea multisepta (SISMONDA) y se estudian las posibles causas de la rareza de este tipo de organismos en este yacimiento

Managérialisation et Etat social : satisfaction et motivation d'intervenants et d'intervenantes socio-éducatives dans des contextes plus ou moins managérialisés

La contribution d'Yves Emery et Julien Niklaus étudie les effets du new managerialism dans le secteur social. Les nouveaux outils de pilotage ont profondément transformé les conditions cadres du travail social, de l'organisation des tâches ainsi que de l'action professionnelle. Les auteurs cherchent à savoir dans quelle mesure ces transformations influencent la motivation et la satisfaction au travail des travailleurs et travailleuses sociales. Ils comparent deux institutions présentant des degrés différents de managérialisation et constatent, avec surprise, une motivation supérieure dans les organisations davantage managérialisées, alors que la satisfaction au travail ne présente pas de différences.