Agonistic interactions elicit rapid changes in brain nonapeptide levels in zebrafish

The teleost fish nonapeptides, arginine vasotocin (AVT) and isotocin (IT), have been implicated in the regulation of social behavior. These peptides are expected to be involved in acute and transient changes in social context, in order to be efficient in modulating the expression of social behavior according to changes in the social environment. Here we tested the hypothesis that short-term social interactions are related to changes in the level of both nonapeptides across different brain regions. For this purpose we exposed male zebrafish to two types of social interactions: (1) real opponent interactions, from which a Winner and a Loser emerged; and (2) mirror-elicited interactions, that produced individuals that did not experience a change in social status despite expressing similar levels of aggressive behavior to those of participants in real-opponent fights. Non-interacting individuals were used as a reference group. Each social phenotype (i.e. Winners, Losers, Mirror-fighters) presented a specific brain profile of nonapeptides when compared to the reference group. Moreover, the comparison between the different social phenotypes allowed to address the specific aspects of the interaction (e.g. assessment of opponent aggressive behavior vs. self-assessment of expressed aggressive behavior) that are linked with neuropeptide responses. Overall, agonistic interactions seem to be more associated with the changes in brain AVT than IT, which highlights the preferential role of AVT in the regulation of aggressive behavior already described for other species.

Modelos de literacia da informação e desenho de um programa para bibliotecas do ensino superior: Uma proposta

A partir de uma panorâmica do atual contexto social, do ensino superior e da situação das bibliotecas universitárias, introduz-se o problema da definição disciplinar em literacia da informação e dos seus modos de ensino. O presente capítulo procura dar resposta a esta questão, aferindo alguns modelos de instrução em literacia da informação e, a partir das linhas de intervenção internacionais e dos principais documentos orientadores, é elaborada uma proposta aplicável às bibliotecas de ensino superior em Portugal.