Browsing by Author "Pereira, João"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
- Environmental and fishery-driven dynamics of the common octopus (Octopus vulgaris) based on time-series analyses from leeward Algarve, southern PortugalPublication . Sonderblohm, Carlos; Pereira, João; Erzini, KarimDynamic factor analysis was used to explore monthly landings per unit effort (LPUE) series of Octopus vulgaris and environmental variables recorded in the southwest Iberian Peninsula, south Portugal. Despite the large fluctuations in the octopus abundance series, results showed a strong aggregation pattern for the last 3 months of the year, possibly related to the input of new recruits to the fishery. The calculated common trend for the 12 months time-series presented significant correlations with autumn rainfall of the previous year (lag - 1), particularly for the October, November, and December series. Other important correlations were found for the Western Mediterranean Oscillation index (lag - 1), Ekman transport, summer river run-off (lag - 1), horizontal and vertical component of windstress, among others. The main trend describes a moderate steady increase in LPUE during the last 10 years, suggesting that octopus abundance has increased from 1990 to 2010. The strong correlations of the monthly octopus LPUE series, together with the annual life cycle, suggest that after environmentally controlled recruitment, population dynamics is largely fishery driven, resulting in strong seasonality in the landings.
- Nannochloropsis oceanica cultivation in pilot-scale raceway ponds—from design to cultivationPublication . Cunha, Pedro; Pereira, Hugo; Costa, Margarida; Pereira, João; Silva, Joana T.; Fernandes, Nuno; Varela, João; Silva, Joana; Simões, ManuelRaceways ponds are the microalgal production systems most commonly used at industrial scale. In this work, two di erent raceway configurations were tested under the same processing conditions to compare their performance on the production of Nannochloropsis oceanica. Biomass productivity, biochemical composition of the produced biomass, and power requirements to operate those reactors were evaluated. Water depths of 0.20 and 0.13 m, and culture circulation velocities of 0.30 and 0.15 m s1 were tested. A standard configuration, which had a full channel width paddlewheel, proved to be the most energy e cient, consuming less than half of the energy required by a modified configuration (had a half channel width paddlewheel). The later showed to have slightly higher productivity, not enough to o set the large di erence in energetic consumption. Higher flow velocity (0.30 m s1) led to a 1.7 g m2 d1 improvement of biomass productivity of the system, but it increased the energy consumption twice as compared to the 0.15 m s1 flow velocity. The latter velocity showed to be the most productive in lipids. A water depth of 0.20 m was the most suitable option tested to cultivate microalgae, since it allowed a 54% energy saving. Therefore, a standard raceway pond using a flow velocity of 0.3 m s1 with a 0.20 m water depth was the most e cient system for microalgal cultivation. Conversely, a flow velocity of 0.15 m s1 was the most suitable to produce lipids.
- Participatory assessment of management measures for octopus vulgaris pot and trap fishery from southern PortugalPublication . Sonderblohm, Carlos; Guimarães, Maria H.; Pita, Cristina; Oliveira, M.R.; Pereira, João; Gonçalves, Jorge Manuel Santos; Erzini, KarimCo-management has shown promising results for the sustainable use of fishery resources. The common octopus (Octopus vulgaris) pot and trap fishery in the Algarve (Portugal) holds the potential for implementation of a co-management system. To explore this potential, seven participatory workshops took place between 2014-2015, bringing together 60 participants from 10 fishing associations and 16 fisheries management and research institutions. The exercise resulted in promising outcomes with regards to the possible implementation of a co-management system for the fishery. In the present work an overview of the outcomes of the participatory workshops is given and compared with initiatives worldwide. Among the management actions identified, some have direct impacts on the octopus' life cycle, while all target the same overall objective: to regulate fishing effort. In the informal setting of the workshops, a formal request was developed: the establishment of an annual closed season in the Algarve. This request was taken into consideration by the responsible management institution.
- Patient-physician discordance in assessment of adherence to inhaled controller medication: a cross-sectional analysis of two cohortsPublication . Jácome, Cristina; Pereira, Ana Margarida; Almeida, Rute; Ferreira-Magalhaes, Manuel; Couto, Mariana; Araujo, Luís; Pereira, Mariana; Correia, Magna Alves; Loureiro, Cláudia Chaves; Catarata, Maria Joana; Maia Santos, Lília; Pereira, João; Ramos, Bárbara; Lopes, Cristina; Mendes, Ana; Cidrais Rodrigues, José Carlos; Oliveira, Georgeta; Aguiar, Ana Paula; Afonso, Ivete; Carvalho, Joana; Arrobas, Ana; Coutinho Costa, José; Dias, Joana; Todo Bom, Ana; Azevedo, João; Ribeiro, Carmelita; Alves, Marta; Leiria Pinto, Paula; Neuparth, Nuno; Palhinha, Ana; Gaspar Marques, João; Pinto, Nicole; Martins, Pedro; Todo Bom, Filipa; Alvarenga Santos, Maria; Gomes Costa, Alberto; Silva Neto, Armandina; Santalha, Marta; Lozoya, Carlos; Santos, Natacha; Silva, Diana; Vasconcelos, Maria João; Taborda-Barata, Luís; Carvalhal, Célia; Teixeira, Maria Fernanda; Alves, Rodrigo Rodrigues; Moreira, Ana Sofia; Sofia Pinto, Cláudia; Morais Silva, Pedro; Alves, Carlos; Câmara, Raquel; Coelho, Didina; Bordalo, Diana; Fernandes, Ricardo M; Ferreira, Rosário; Menezes, Fernando; Gomes, Ricardo; Calix, Maria José; Marques, Ana; Cardoso, João; Emiliano, Madalena; Gerardo, Rita; Nunes, Carlos; Câmara, Rita; Ferreira, José Alberto; Carvalho, Aurora; Freitas, Paulo; Correia, Ricardo; Fonseca, Joao AWe aimed to compare patient's and physician's ratings of inhaled medication adherence and to identify predictors of patient-physician discordance.
- Ready for co-management? Portuguese artisanal octopus fishers preferences for management and knowledge about the resourcePublication . Silva, Priscila; Cabral, Henrique; Rangel, Mafalda; Pereira, João; Pita, CristinaIn Portugal, the common octopus (Octopus vulgaris) dominates the total catches and landings from small scale fisheries. The small-scale fisheries have been targeting the common octopus for a long time and it is consistently one of the most important commercial fishing resources in the country. Questionnaires were conducted in 13 fishing ports in the south and southwest coasts of Portugal, from November 2014 to December 2016, to explore octopus artisanal fishers’ preferences for management and their knowledge about the biology and ecology of octopus. The survey revealed that fishers are generally not satisfied with the current management of the octopus fisheries. Some differences in preferences for management were found between regions, but in general, fishers strongly supported biological closures and local management plans developed by themselves. Fishers seemed to be interest in being more involved in the decision-making process, but only seem to have a moderate knowledge about the biology and ecology of the resource they exploit. A greater involvement of fishers in decision-making process will contribute to increase their awareness and knowledge about the resource, their receptivity to and acceptance of management measures, as well as increase their feeling of responsibility towards, and ownership of the resource.