Escola Superior de Turismo e Tecnologia do Mar
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Browsing Escola Superior de Turismo e Tecnologia do Mar by Field of Science and Technology (FOS) "Ciências Agrárias::Ciência Animal e dos Laticínios"
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- Growth Performance after Agouti-Signaling Protein 1 (Asip1) Overexpression in Transgenic ZebrafishPublication . Godino-Gimeno, Alejandra; Sánchez, Elisa; Guillot, Raúl; Rocha, Ana; Angotzi, Anna Rita; Leal, Esther; Rotllant, Josep; Cerdá-Reverter, José MiguelThe melanocortin system is a key structure in the regulation of energy balance. Overexpression of inverse agonists, agouti-signaling protein (ASIP), and agouti-related protein (AGRP) results in increased food intake, linear growth, and body weight. ASIP regulates dorsal-ventral pigment polarity through melanocortin 1 receptor (MC1R) and overexpression induces obesity in mice by binding to central MC4R. Asip1 overexpression in transgenic zebrafish (asip1-Tg) enhances growth, yet experiments show fish overexpressing Asip1 do not develop obesity even under severe feeding regimes. Asip1-Tg fish do not need to eat more to grow larger and faster; thus, increased food efficiency can be observed. In addition, asip1-Tg fish reared at high density are able to grow far more than wild-type (WT) fish reared at low density, although asip1-Tg fish seem to be more sensitive to crowding stress than WT fish, thus making the melanocortin system a target for sustainable aquaculture, especially as the U.S. Food and Drug Association has recently approved transgenic fish trading.
- A warming decade unveils changes in the chaetognath Parasagitta friderici and appendicularian Oikopleura dioica abundance in a coastal system of the Iberian PeninsulaPublication . Dolgner, Nuno; Marques, Sónia Cotrim; Monteiro, Marta; Primo, Ana Lígia; Pardal, Miguel A.; Azeiteiro, Ulisses M.The influence of multiscale processes such as climate, hydrodynamic and biological alterations on two coastal and estuarine gelatinous zooplankton groups were assessed under a warming decade from 2003 to 2012. At three sampling stations on the Mondego estuary, zooplankton and water samples were collected, evaluating the abundance of chaetognaths and appendicularians. P. friderici and O. dioica were the most prominent species from each gelatinous zooplankton group, occurring in 87% and 86% from all the samples analysed, respectively. Both species displayed higher abundances during summer–autumn months and presented similar seasonal peaks whose densities increased after the first half of the study period. Statistical analysis showed that water temperature, salinity and copepods abundance explained most of the variance in the interannual abundance of both species. This study emphasizes the importance of these less spoken species, which play crucial roles in the ecosystem and points out their resilience to extreme weather events, thriving under future climate change situations.