15 documents found, page 1 of 2
Multi-marker DNA metabarcoding for precise species identification in ichthyopla...
Ferreira, André O.; Barroso, Cristina; Azevedo, Olga Mouteira; Duarte, Sofia; Egas, Conceição; Fontes, João T.; Ré, Pedro; Santos, A. Miguel P.Ichthyoplankton monitoring is crucial for stock assessments, offering insights into spawning grounds, stock size, seasons, recruitment, and changes in regional ichthyofauna. This study evaluates the efficiency of multi-marker DNA metabarcoding using mitochondrial cytochrome c oxidase subunit I (COI), 12S rRNA and 16S rRNA gene markers, in comparison to morphology-based methods for fish species identification in...
Field test of an autonomous observing system prototype for measuring oceanograp...
Santos, Fernando P.; Rosa, Teresa L.; Hinostroza, Miguel A.; Vettor, Roberto; Santos, A. Miguel P.; Guedes Soares, C.A prototype of an autonomous system for the retrieval of oceanographic, wave, and meteorologic data was installed and tested in May 2021 on a Portuguese research vessel navigating on the Atlantic Ocean. The system was designed to be installed in fishing vessels that could operate as a distributed network of ocean data collection. It consists of an automatic weather station, a ferrybox with a water pumping syste...
Vulnerable marine ecosystems survey pilot missions with EVA Hybrid AUV/ROV
Almeida, Carlos; Martins, Alfredo; Soares, Eduardo; Santos, A. Miguel P.; Matias, Bruno; Silva, Pedro; Pereira, Ricardo; Sytnyk, DenysFishing for deep-sea species occurs on continental slopes, ridges, and seamounts. Fishing operations using fishing gears that contact the bottom (e.g., trawls and bottom longlines) may have significant impacts on Vulnerable Marine Ecosystems (VMEs). VMEs refer to marine ecosystems with a population or community of sensitive taxa or habitats that are likely to experience substantial alteration from short-term to...
Towards a global Fishing Vessel Ocean Observing Network (FVON): state of the ar...
Van Vranken, Cooper; Jakoboski, Julie; Carroll, John W.; Cusack, Christopher; Gorringe, Patrick; Hirose, Naoki; Manning, James; Martinelli, MichelaOcean observations are the foundation of our understanding of ocean processes. Improving these observations has critical implications for our ability to sustainably derive food from the ocean, predict extreme weather events that take a toll on human life, and produce the goods and services that are needed to meet the needs of a vast and growing population. While there have been great leaps forward in sustained ...
Review and prospects for autonomous observing systems in vessels of opportunity
Rosa, Teresa L.; Santos, A. Miguel P.; Vettor, Roberto; Soar, C. GuedesThis paper focuses on the state of the art on Autonomous Observing Systems (AOS) used in Vessels of Opportunity (VOO) for collecting in situ atmospheric, oceanic and biogeochemical data. The designation Vessels of Opportunity includes all kinds of ships, even if not having scientific goals, which may carry proper devices that autonomously measure environmental variables. These vessels can be merchant, military,...
Importance of the mesoscale in the decadal changes observed in the northern Can...
Relvas, Paulo; Luis, Joaquim; Santos, A. Miguel P.Analysis of sea surface temperature (SST) time series since 1960 from existing data bases shows a generalized warming trend in the northern Canary upwelling system. The field of the satellite-derived SST trends off Western Iberia was built at the pixel scale (4 x 4 km) for the period 1985-2008, revealing significant spatial differences in the warming rates. Weaker warming trends fit to the known upwelling patte...
RNA:DNA ratios as a proxy of egg production rates of Acartia
Cruz, Joana; Teodósio, M. Alexandra; Ben-Hamadou, Radhouane; Chícharo, Luís; Garrido, Susana; Re, Pedro; Santos, A. Miguel P.Estimates of copepod secondary production are of great importance to infer the global organic matter fluxes in aquatic ecosystems and species-specific responses of zooplankton to hydrologic variability. However, there is still no routine method to determine copepods secondary production in order to eliminate time consuming experimental analyses. Therefore, we determined whether there is a correlation between Eg...
Temperature and food-mediated variability of European Atlantic sardine recruitment
Garrido, Susana; Silva, Alexandra; Marques, Vitor; Figueiredo, Ivone; Bryère, Philippe; Mangin, Antoine; Santos, A. Miguel P.The influence of the environmental conditions during larval development on the resulting recruitment strength was investigated for European sardine (Sardina pilchardus) at Atlanto-Iberian waters. Satellite-derived Sea Surface Temperature (SST) and Chlorophyll-a concentration (Chla) data from the previous spawning seasons (January to March/April and October to December of the previous year) were related to recru...
Temperature and food-mediated variability of European Atlantic sardine recruitment
Garrido, Susana; Silva, Alexandra; Marques, Vitor; Figueiredo, Ivone; Bryere, Philippe; Mangin, Antoine; Santos, A. Miguel P.The influence of the environmental conditions during larval development on the resulting recruitment strength was investigated for European sardine (Sardina pilchardus) at Atlanto-Iberian waters. Satellite-derived Sea Surface Temperature (SST) and Chlorophyll-a concentration (Chla) data from the previous spawning seasons (January to March/April and October to December of the previous year) were related to recru...
Decapod larvae distribution and species composition off the southern Portuguese...
Pochelon, Patricia N.; Pires, Rita F. T.; Dubert, Jesus; Nolasco, Rita; Santos, A. Miguel P.; Queiroga, Henrique; dos Santos, AntoninaFor decapod crustaceans, the larval phase is the main responsible for dispersal, given the direct emission from adult habitats into the water column. Circulation patterns and behavioural mechanisms control the dispersal distance and connectivity between different areas. Information on larval distribution and abundance is required to predict the size and location of breeding populations, and correctly manage mar...