CCM4-Vários
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- Growth hormone profiles and development of somatotrophs in Atlantic Halibut LarvaePublication . Einarsdóttir, Ingibjörg E.; Sweeney, Glen E.; Power, Deborah; Kristjánsson, Birgir A.; Björnsson, Björn ThrandurThe Atlantic halibut is the largest flatfish species, and as other flatfish, has a complicated larval development. The pelagic larvae hatch after about two weeks and feeding starts six weeks later. After three to four months, they start to undergo metamorphosis. Following major changes in body shape, including the migration of the left to the right side, the larvae settle as bottom dwelling. In Atlantic halibut aquaculture, the larval rearing is a critical rearing stage, with high incidence of mortality and abnormal development.
- Skeletal development and bone-related gene expression in fish larvaePublication . Gavaia, Paulo J.; Cancela, LeonorThe fish skeleton; skeletal malformations; skeletal malformations in mediterranean species; Types of skeletal malformations; Senegal sole skeletal development; Senegal sole skeletal deformities; Skeletal development in Danio rerio; ALP and TRAP in skeletal development; Skeletal development in Pagrus auriga; Time course of skeletal development in Pagrus auriga; Spatio-temporal pattern of bgp expression; bgp / mgp expression during development; In situ localization of zebrafish bgp mRNA;In situ localization of sole bgp mRNA; Immuno-detection of Bgp accumulation in zebrafish; Immuno-detection of Bgp accumulation in sole P.; In situ localization of zebrafish and sole mgp mRNA; Immuno-detection of MGP accumulation in zebrafish; Summary of zebrafish skeletogenesis; Summary of Senegal sole skeletogenesis; In situ localization of zebrafish CollX1 mRNA;
- Warfarin effects in the skeletal development of zebrafish (Danio rerio)Publication . Peres dos Santos, R.; Bensimon-Brito, A.; Gavaia, Paulo J.; Cancela, LeonorVitamin K-dependent gamma carboxylation (VKGC) is crucial for posttranslational modification of glutamate residues to form α-carboxy glutamic acid (Gla) in the presence of reduced vitamin K, molecular oxygen, and carbon dioxide (1). This modification has important implications, mainly physiological, like homeostasis, signal transduction and bone calcification. This mechanism ensures complete carboxylation of coagulation factors, and proteins like bone Gla protein (BGP) and matrix Gla protein (MGP), being essential for their biological activity. Warfarin is a known anticoagulant that inhibits the action of VKGC (2), inhibiting consequently the activity of the referred proteins.
- Two isoforms of vasa maternal factor in Senegalese sole: Biotechnological applicationsPublication . Pacchiarini, T.; Cabrita, Elsa; Cross, I.; Ortiz-Delgado, J. B.; Leite, Ricardo; Gavaia, Paulo J.; Herráez, M. P.; Rebordinos, L.; Sarasquete, C.Primordial Germ Cells (PGCs) identification and manipulation present considerable potential for hatchery practice and surrogate broodstocks. To carry out the PGCs characterization a specific molecular marker is required. The vasa gene is a good candidate to identify PGCs and others germinal cells (Nagasawa et al., 2009). The aim of this study was the cloning of the Solea senegalensis vasa cDNA and its expression pattern during early development and adulthood.
- Modeling species composition and mortality rates of sea turtles in the Portuguese pelagic longline fishery targeting swordfish in the Atlantic Ocean: preliminary results using statistical modelsPublication . Coelho, Rui; Rosa, Daniela; Lino, Pedro; Santos, Miguel
- Observations on small tunas caught in the tuna trap fishery off southern Portugal (NE Atlantic) between 1996 and 2014Publication . Lino, Pedro; Coelho, Rui; Neves dos Santos, MiguelThis study reports on the trends of small tuna catches from a tuna trap operating off the southern coast of Portugal between 1996 and 2014. Landing and catch at size data from one tuna trap were available for bullet tuna (Auxis rochei), Atlantic bonito (Sarda sarda) and little tunny (Euthynnus alletteratus). Trends of intra- and inter-annual catches for the three species were analyzed. Landings occurred mostly during the 2nd and 3rd quarters, with peaks in May for A. rochei and in September for S. sarda and E. alletteratus. Catch at size data shows that similar size ranges of the three species were captured.
- Large-scale prediction of seagrass distribution: the case of Cymodocea nodosa (Mediterranean-Atlantic)Publication . Chefaoui, Rosa M.; Assis, J.; Duarte, C. M.; Serrão, EsterUnderstanding the factors that affect seagrass meadows encompassing their entire range of distribution is challenging yet important for their conservation. We model the environmental niche of Cymodocea nodosa using a combination of environmental variables and landscape metrics to examine factors defining its distribution and find suitable habitats for the species. The most relevant environmental variables defining the distribution of C. nodosa were sea surface temperature (SST) and salinity. We found suitable habitats at SST from 5.8 ºC to 26.4 ºC and salinity ranging from 17.5 to 39.3. Optimal values of mean winter wave height ranged between 1.2 m and 1.5 m, while waves higher than 2.5 m seemed to limit the presence of the species. The influence of nutrients and pH, despite having weight on the models, was not so clear in terms of ranges that confine the distribution of the species. Landscape metrics able to capture variation in the coastline enhanced significantly the accuracy of the models, despite the limitations caused by the scale of the study. By contrasting predictive approaches, we defined the variables affecting the distributional areas that seem unsuitable for C. nodosa as well as those suitable habitats not occupied by the species. These findings are encouraging for its use in future studies on climate-related marine range shifts and meadow restoration projects of these fragile ecosystems.
- Using niche modelling of indicator species to predict the distribution of xerophitic shrub dune communities in South-Western PortugalPublication . Chefaoui, Rosa M.; Chozas, Sergio; Correia, Otilia; Santos, Ana M. C.; Hortal, JoaquínInland sand dune systems are amongst the most threatened habitat types of Europe. Affected by severe conditions, these habitats present distinct community compositions, which makes them excellent for studying possible interactions among their integrating species and the environment. We focus on understanding the distribution and cooccurrence of the species from dune plant assemblages as a key step for the adequate protection of these habitats. Using data from an extensive survey we identified the shrub species that could be considered indicators of the different xerophytic scrub dune communities in South West Portugal. Then, we modelled the responses of these species to the environmental conditions using Ecological Niche Factor Analysis. We present some preliminary results elucidating whether using species distribution models of indicator species at a regional scale is a valid approach to predict the distribution of the different types of communities inhabiting these endangered habitats.
- Successional dynamics in inland dune shrub communities drive changes in functional diversityPublication . Chozas, Sergio; Correia, Otilia; Santos, Ana M. C.; Chefaoui, Rosa M.; Hortal, JoaquínCommunities can be defined as assemblages of species coexisting under particular environments. The relationship between environment and species are regulated by both environmental requirements –which ultimately determine the species capacity to establish and survive in a particular environment– and the ecological interactions occurring during assembly processes –which also determine community composition by conditioning species coexistence. In this context, plant functional traits are attributes that represent ecological strategies and determine how plants respond to environmental factors and interact with other species. Therefore, the analysis of how traits vary through the dynamics of communities, such as along successions, can give insights about how environmental requirements and species interactions may determine the composition and functional structure of these communities. The xerophytic shrub communities inhabiting inland sand dunes in SW Portugal are characterized by successional processes that are mainly driven by local (edaphic gradients and human disturbance) and regional (climate) processes. Therefore, they constitute an appropriate system for studying species interactions and environmentcommunity co-variations based on functional terms. Using these communities as a model, we evaluate the hypothesis that successional community changes in species composition of xerophytic shrub communities can result in concurrent changes in functional diversity
- Landscape metrics as indicators of coastal morphology and its use in ecological niche modelling of seagrass speciesPublication . Chefaoui, Rosa M.; Assis, J.; Duarte, Carlos M.; Serrão, EsterDependence of some species on landscape structure has been proved in numerous studies. So far, however, little progress has been made in the integration of landscape metrics in the prediction of species associated with coastal features. Specific landscape metrics were tested as predictors of coastal shape using three coastal features of the Iberian Peninsula (beaches, capes and gulfs) at different scales. We used the landscape metrics in combination with environmental variables to model the niche and find suitable habitats for a seagrass species (Cymodocea nodosa) throughout its entire range of distribution. Landscape metrics able to capture variation in the coastline enhanced significantly the accuracy of the models, despite the limitations caused by the scale of the study. We provided the first global model of the factors that can be shaping the environmental niche and distribution of C. nodosa throughout its range. Sea surface temperature and salinity were the most relevant variables. We identified areas that seem unsuitable for C. nodosa as well as those suitable habitats not occupied by the species. We also present some preliminary results of testing historical biogeographical hypotheses derived from distribution predictions under Last Glacial Maximum conditions and genetic diversity data.