Padrões verticais e inter-anuais nas assembleias de larvas de peixe junto ao substrato rochoso do Parque Marinho da Arrábida

Dissertação de mest., Biologia Marinha, Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2009

As obrigações do tesouro e os Swaps de risco de incumprimento: análise da sua inter-relação aplicada ao caso português

Dissertação de mest., Finanças Empresariais, Faculdade de Economia, Univ. do Algarve, 2012

Androgens and Mating Systems in Fish: Intra- and Inter-specific Analysis

One of the predictions of the ‘challenge hypothesis’ (Wingfield et al., 1990) is that androgen patterns during the breeding season should vary among species according to the parenting and mating system. Here we assess this prediction of the challenge hypothesis both at the intra- and at the inter-specific level. To test the hypothesis at the inter-specific level, a literature survey on published androgen pat- terns from teleost fish with different mating systems was carried out. The results confirm the predicted effect of mating system on andro- gen levels. To test the hypothesis at an intra-specific level, a species with flexible reproductive strategies (i.e. monogamy vs. polygyny), the Saint Peter’s fish was studied. Polygynous males had higher 11- ketotestosterone levels. However, males implanted with methyl-tes- tosterone did not became polygynous and the variation of the ten- dency to desert their pair mates was better explained by the repro- ductive state of the female partner. This result stresses the point that the effects of behaviour on hormones cannot be considered without respect to the social context.

A rede de transportes inter-urbanos de passageiros e a sua adequação ao modelo de ordenamento da região

Dissertação de Mestrado, Ciências Económicas e Empresariais, Unidade de Economia e Administração, Universidade do Algarve, 1996