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  • Sleep quality and mental health
    Publication . João, Karine; Jesus, Saul
    Sleep is an essential behavior for life and obeys to a complex biological, psychological, social and cultural process with multiple implications in the quality of life of individuals. Sleep quality has been investigated dramatically in the past 20 years because of its role in the physical and mental health of clinical populations, as well as, in the search of more normative values in non-clinical populations. Still, although there has been an increasing interest on the implications of sleep on health, the empirical evidences with non-clinical populations are almost nonexistent. These investigation´s main objectives were to analyze the impact of sleep quality on the depression, anxiety and stress (mental health indicators) of a non-clinical population, and to evaluate if the relationship between these variables is moderated by gender, age and country of origin. A total of 1552 participants from three different countries (Portugal, Spain and Brazil) answered to a questionnaire with two different validated instruments which measure sleep quality and mental health indicators. The obtained results confirmed the initially proposed hypothesis. We attested that sleep quality has a significant impact on the mental health indicators. As well, we verified that the relationship between sleep quality and the mental health indicators in study (depression, anxiety and stress) is only moderated by the country of origin. In accordance with our main results and conclusions we outlined some strategies to promote awareness and early interventions on quality of sleep, targeting the specificity of each population/individual.
    2018-10-15Tese de doutoramento Acesso aberto Ver mais
  • First assessment of the thryssa vitrirostris (Engraulidae) beach seine fishery in northeastern mozambique
    Publication . Manuessa, Bonifácio; Morais, Eurico; Borges, Teresa Cerveira; Teodosio, Maria; Leitão, Francisco
    Monthly length-frequency data, from 2009 to 2014, was used to estimate the growth parameters, mortality, and spawning season, and to assess the exploitation status of Thryssa vitrirostris (Engraulidae) fisheries in Pebane. The von Bertalanffy asymptotic length (L∞) and growth rate (K) were 25.1 cm (standard length) and 0.41 per year (standard length), respectively. Two proxy recruitment peaks were found: the first peak of recruitment occurs from April to July, and the second recruitment peak from September to October. The total estimated mortality rates (Z), natural mortality (M), and fishing mortality (F) were Z = 1.31, M = 0.92, and F = 0.39. For the beach seine gear, the size at first catch of T. vitrirostris was Lc25 = 4.43 cm. The 50% retention size of the catch was Lc50 = 5.39 cm. The retention probability analyses revealed a large rate of juvenile fishing mortality (54.2%). The estimated exploitation rate (0.30) was below the maximum exploitation rate (0.48), and above the optimal sustainable exploitation rate (E50 = 0.28), evidencing a sustainable fishery. However, under such an exploitation regime, it is advised that a continuously monitoring-survey of T. vitrirostris is maintained. An increase in migration of fishermen has been recently recorded in Pebane, due to its rich fisheries, which can increase the fishing effort and the risk of overexploitation if management measures (such as mesh size increase) are not taken in advance.
    2018-10-15Artigo científico Acesso aberto Ver mais