Browsing by Issue Date, starting with "2025-03-07"
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- Spatial and temporal size distribution of swordfish in the Atlantic Ocean: implications for conservation and managementPublication . Rosa, Daniela; Schirripa, Michael; Gillespie, Kyle; Macías, David; Forselledo, Rodrigo; Mourato, Bruno; Kai, Mikihiko; Arocha, Freddy; Su, Nan-Jay; Kerwath, Sven; Bahou, Laurent; Pappalardo, Luigi; Diaz, Guillermo A.; Lino, Pedro G.; Salmeron, Francisca; Urbina, Josetxu Ortiz de; Cardoso, Luis Gustavo; Sant’Ana, Rodrigo; Travassos, Paulo; Santos, Miguel N.; Erzini, Karim; Domingo, Andrés; Báez, Jose Carlos; Hanke, Alex; Brown, Craig; Coelho, RuiSwordfish (Xiphias gladius) is a common target species of surface pelagic longline fisheries. In the Atlantic Ocean and Mediterranean Sea, swordfish is managed as three separate stocks, all having management measures in place to rebuild or conserve the stocks, including minimum landing sizes. The objective of this study was to review size data for swordfish in the Atlantic Ocean, model the sex-specific size distribution and determine areas where there is higher likelihood of capturing undersized fish. The size distribution differed between males and females and varied by quarter, indicating movements of large fish between temperate and tropical waters. Undersized fish seems to occur in association with coastal waters, with higher proportions in the Northwest Atlantic and tropical areas. This study provides a better understanding of the temporal and spatial size and sex distribution of swordfish and presents insights into the distribution of undersized swordfish that is subject to management measures.
- Technical note: large offsets between different datasets of seawater isotopic composition – an illustration of the need to reinforce intercalibration effortsPublication . Reverdin, Gilles; Waelbroeck, Claire; Voelker, Antje; Meyer, HannoWe illustrate offsets in surface seawater isotopic composition between recent public datasets from the Atlantic Ocean and the subtropical southeastern Indian Ocean. The observed offsets between datasets often exceed 0.10 parts per thousand in delta 18O and 0.50 parts per thousand in delta 2H. They might in part originate from different sampling of seasonal, interannual, or spatial variability. However, they likely mostly originate from different instrumentations and protocols used to measure the water samples. Estimation of the systematic offsets is required before merging the different datasets in order to investigate the spatiotemporal variability of isotopic composition in the world ocean surface waters. This highlights the need to actively share seawater isotopic composition samples dedicated to specific intercomparison of data produced in different laboratories and to promote best practices, a task to be addressed by the new Scientific Committee of Oceanic Research (SCOR) working group 171.
- Bioprospecting marine fungi from the plastisphere: osteogenic and antiviral activities of fungal extractsPublication . Furno, Matteo Florio; Laizé, Vincent; Arduino, Irene; Pham, Giang Nam; Spina, Federica; Mehiri, Mohamed; Lembo, David; Gavaia, Paulo; Varese, Giovanna CristinaMarine microplastics (MPs) represent a novel ecological niche, populated by fungi with high potential for pharmaceutical discovery. This study explores the bioactivity of fungal strains isolated from MPs in Mediterranean sediments, focusing on their osteogenic and antiviral activities. Crude extracts prepared via solid-state and submerged-state fermentation were tested for their effects on extracellular matrix mineralization in vitro and bone growth in zebrafish larvae, and for their activity against the respiratory syncytial virus (RSV) and herpes simplex virus type 2 (HSV-2). Several extracts exhibited significant mineralogenic and osteogenic activities, with Aspergillus jensenii MUT6581 and Cladosporium halotolerans MUT6558 being the most performing ones. Antiviral assays identified extracts from A. jensenii MUT6581 and Bjerkandera adusta MUT6589 as effective against RSV and HSV-2 at different extents, with no cytotoxic effect. Although chemical profiling of A. jensenii MUT6581 extract led to the isolation of decumbenones A and B, they did not reproduce the observed bioactivities, suggesting the involvement of other active compounds or synergistic effects. These results highlight the plastisphere as a valuable resource for novel bioactive compounds and suggest the need for further fractionation and characterization to identify the molecules responsible for these promising activities.
- A influência da cultura organizacional na satisfação no trabalho: o caso dos profissionais de saúde do serviço de urgência polivalente do Centro Hospitalar Universitário do AlgarvePublication . Sequeira, Rita Ribeiro; Pescada, SusanaA cultura organizacional e a satisfação no trabalho são temas de grande relevância no contexto das organizações de saúde. A investigação nestes domínios tem contribuído para aumentar o conhecimento científico, estimulando a criação de estratégias de gestão mais alinhadas, no sentido de uma mudança positiva nas organizações. O objetivo principal desta investigação é analisar a influência da cultura organizacional na satisfação dos profissionais de saúde que integram o Serviço de Urgência Polivalente do Centro Hospitalar Universitário do Algarve. Realizou-se um estudo do tipo descritivo e correlacional e de corte transversal com uma amostra de 194 profissionais de saúde de um serviço hospitalar de emergência, tendo sido aplicado um inquérito por questionário divido em três partes: o Denison Organizational Culture Survey, o Job Satisfaction Survey e o perfil sociodemográfico. O período de colheita decorreu entre dezembro de 2022 e fevereiro de 2023. Os dados foram alvo de tratamento estatístico através do software Statistical Package for the Social Sciences. Os resultados do estudo confirmaram que as culturas mais evidentes são as de envolvimento e consistência, apesar dos profissionais manifestarem a necessidade de promover uma cultura de missão. Apurou-se, ainda, que os profissionais estão insatisfeitos, sendo os maiores determinantes dessa insatisfação o salário, as promoções, os benefícios adicionais, as recompensas, as condições de trabalho e a comunicação. A supervisão, os colegas e o tipo de trabalho surgem como fatores de satisfação no trabalho. Verificou-se a existência de correlações estatisticamente significativas e positivas entre todas as dimensões da cultura organizacional e as subescalas da satisfação no trabalho. Conclui-se que a cultura de missão está associada a maior satisfação no trabalho, o que sugere a necessidade de orientar este serviço para uma gestão da mudança cultural como foco no sentido de missão, motivação e produtividade através de ações promotoras da satisfação dos profissionais.