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La creciente necesidad de informacion que requiere la evaluacion y gestion actuales de las especies explotadas, especialmente en el caso de la merluza, pero tambien en otros como los gallos, rapes o la cigala, hacen necesario obtener informacion independiente de las pesquerias sobre la situacion de estas poblaciones. Para lo cual se determino la realizacion de los siguientes objetivos:\nEstimacion de indices de abundancia estratificados por edad de merluza, rapes y gallos en las divisiones VIIbk.\nEstimacion de indices de abundancia estratificados de otras especies comerciales como la cigala, el mendo, las rayas o la brotola.\nEstimacion de la fuerza de los reclutamientos y localizacion de las agregaciones de juveniles de merluza, rapes y gallos.\nDescripcion de los patrones de distribucion espacial de las especies demersales y bentonicas en el banco de Porcupine.\nRecogida de material para estudios de contaminacion por metales pesados.\nRecogida de material para estudios geneticos.\nRecogida de la especie 'POTA EUROPEA' para estudios de parasitos.
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La creciente necesidad de informacion que requiere la evaluacion y gestion actuales de las especies explotadas, especialmente en el caso de la merluza, pero tambien en otros como los gallos, rapes o la cigala, hacen necesario obtener informacion independiente de las pesquerias sobre la situacion de estas poblaciones. Para lo cual se determino la realizacion de los siguientes objetivos:\nEstimacion de indices de abundancia estratificados por edad de merluza, rapes y gallos en las divisiones VIIbk.\nEstimacion de indices de abundancia estratificados de otras especies comerciales como la cigala, el mendo, las rayas o la brotola.\nEstimacion de la fuerza de los reclutamientos y localizacion de las agregaciones de juveniles de merluza, rapes y gallos.\nDescripcion de los patrones de distribucion espacial de las especies demersales y bentonicas en el banco de Porcupine.\nRecogida de material para estudios de contaminacion por metales pesados.\nRecogida de material para estudios geneticos.
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The overall aim of the UKSOLAS project DOGEE-SOLAS is the parameterization of air-sea gas exchange, which is a currently a major uncertainty in global modelling. RRS Discovery cruise D320 thus was primarily concerned with the measurement of air-sea gas transfer velocities and some of the important physical parameters that influence them through contributing to near surface turbulence, and other processes. In brief, specific cruise objectives were: 1. Determine open ocean gas transfer velocities through a number of dual-tracer releases (3He & SF6). 2. Investigate the role of surfactant in gas exchange through a targeted surfactant release in conjunction with (1). 3. Determine CO2 fluxes and transfer velocities, and make associated hydrographic and turbulence related measurements from autonomous ASIS (Air-Sea Interaction Spar) buoys. 4. Measure air-sea fluxes of CO2, sensible heat, latent heat and momentum using the AUTOFLUX automated sensor array 5. Measure underway, total gas tension, dissolved O2, and CO2 to obtain independent air-sea gas exchange estimates. 6. Make covariance and gas budgeting estimates of air-sea gas exchange using intelligent profiling Lagrangian floats. 7. Independently determine DMS fluxes and gas transfer velocities for comparison with CO2 to examine the role of gas solubility in gas transfer. 8. Deploy a spar buoy (NOC) for measurement of wave heights and bubble properties 9. Record and measure whitecap coverage and wave breaking coincident with the air-sea flux measurements using ship mounted cameras 10. Record key meteorological variables 11. Quantify flow distortion biases in the direct flux measurements via the use of established models. 12. Make biogas, surfactant and bacterial measurements in the surface microlayer and in the uppermost metres of the ocean using surface microlayer samplers, a remotely operated catamaran, and a near surface sampler. 13. Deploy an autonomous powered profiler (ASIP) for turbulence-related measurements in the mixed layer. Objectives 1-12 were all met. Unfortunately, due to mechanical failure and loss of ASIP, objective 13 was not realised.
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Spanish Porcupine bottom trawl survey aims to collect data on the distribution and relative abundance, and biological information of commercial fish in Porcupine bank area (ICES Division 7b-k). The primary target species are hake, monkfish, white anglerfish and megrim, which abundance indices are estimated by age, with abundance indices also estimated for Nephrops, four-spot megrim and blue whiting. Data collection is also collected for several other demersal fish species and invertebrates.
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Main objectives: assesment and maping of spawing biomass of blue whiting by ecointegration, characterization of the hidrologic conditions of the surveyed area.
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The cruise D361 forms part of a study entitled 'Physical and chemical forcing of diazotrophy in the (sub)-tropical Atlantic Ocean'. The study is investigating the potential influence of iron and phosphorus availability on nitrogen fixation in regions of the tropical Atlantic Ocean. The cruise also undertakes deep trace metal clean CTD casts as part of the International GEOTRACES programme. The purpose of the cruise therefore is to undertake measurements of dissolved and particulate iron and phosporpus availability, their spatial and temporal variations, and their impact on diazotrophy in the surface ocean. Aim: To quantify the supply and determine the biogeochemical cycling of Fe and other nutrients, and relate this to N2 fixation, diazotroph species distribution and N* fields. 1. Quantify the distribution of nutrients and trace metals: Quantify surface water and water column distributions of dissolved inorganic/organic N, P, Fe, and DAl, DMn and particulate P, N, Fe, Al, Mn. 2. Quantify the rate of Fe, Al, Mn, P and N supply to surface waters: Assess the source fluxes of the key elements for diazotrophs and source tracers to the surface ocean from atmospheric deposition and internal transport via diapycnal mixing and lateral advection. 3. Identify the source of subsurface Fe enrichment: Identify whether Fe-rich subsurface waters of the tropical North Atlantic thermocline originate from the atmosphere or the shelf using Fe distributions and Al, Mn, and O2 source tracers. 4. Quantify the diazotrophic response to Fe, phosphate, DOP supply: Relate the spatial distributions of inorganic Fe and organically complexed Fe, and phosphate and DOP to diazotrophy. The specific uptake of Fe, phosphate and DOP by the whole microbial community and Trichodesmium will be assessed by shipboard incubations, radiotracer techniques and enzyme bioassays. In addition, we will identify the connection between N2 fixation rates and diazotroph community structure, by comparing size fractionated 15N2-derived rates of N2 fixation (Fig. 1) with abundance and diversity of diazotrophs using nifH phylogeny. Objective 5: Investigate how the large scale transport pathways of Fe and P influence the N* distribution: Use fine-scale isopycnic model to reveal the large-scale transport pathways of Fe and P in the (S)-T Atlantic, and their effect on the N* distribution.
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Evaluate transport of water salinity, temperature, carbon and other variables of the greenhouse
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Spanish Porcupine bottom trawl survey aims to collect data on the distribution and relative abundance, and biological information of commercial fish in Porcupine bank area (ICES Division VIIb-k). The primary target species are hake, monkfish, white anglerfish and megrim, which abundance indices are estimated by age, with abundance indices also estimated for Nephrops, four-spot megrim and blue whiting. Data collection is also collected for several other demersal fish species and invertebrates.
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1. Calibration and testing transducers noise. 2. To estimate the abundance of the main pelagic fish (sardines, anchovies, mackerel, etc.) by the method of echo integration in the northern Spanish coast and map their range. 3. Determine the main biological characteristics of target fish species: age structure and length, length / weight ratio and maturity stage from sampling biological sardine, anchovy, mackerel, horse mackerel, horse mackerel, chub mackerel, blue whiting and hake. 4. Determine the size structure of all fish species caught. 5. Estimate the TS / length ratio of the target species 6. To estimate the relative abundance and mapped the distribution of sardine and anchovy eggs. 7. Characterization of the hydrological conditions of the survey area, especially thermohaline properties of the waters over the continental shelf. Measurement of vertical profiles of temperature, salinity and fluorescence in stations (CTD Casts) and acquisition of continuous sea surface data (ttemperature, salinity and fluorescence). 8. Study of the relationship of oceanographic and meteorological conditions with distribution and abundance of sardine eggs and adults. 9. Determine the distribution patterns of taxonomic diversity and biomass different size classes of plankton (pico-, phyto- and zooplankton) in the study area. 10. Characterize the horizontal and vertical distribution of plankton. Mapping biomass plankton size classes 11. Plankton biomass estimation, fractional and total. Studying the relationship between ichthyoplankton and plankton. 12. Estimate the natural abundance of N15 in sardine, anchovy, mackerel, and krill and myctophids to determine their trophic position. 13. Mapping the abundance of top predators 14. Map the relative abundance of anthropogenic sea surface microplastic 15. Estimate the strength of recruitment of anchovy and other species in the Cantabrian observed during the JUVENA campaign. 16. Estimate blue whiting biomass in Porcupine Seabight in coordination with the other nations performing the International Blue Whiting Spring Survey (IBWSS).
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Spanish Porcupine bottom trawl survey aims to collect data on the distribution and relative abundance, and biological information of commercial fish in Porcupine bank area (ICES Division VIIb-k). The primary target species are hake, monkfish, white anglerfish and megrim, which abundance indices are estimated by age, with abundance indices also estimated for Nephrops, four-spot megrim and blue whiting. Data collection is also collected for several other demersal fish species and invertebrates.m