Variabilidad genética y estructura de la población del chicharro, Trachurus picturatus (Bowdich, 1824), en las Islas Canarias.

Memoria presentada para optar al Diploma de Estudios Avanzados en Ciencias del Mar

A simple model to estimate active flux in relation to zooplankton lunar cycles in subtropical waters

Máster en Oceanografía. Programa de Doctorado en Oceanografía

Nutrientes y termoclinas en la Estación Europea de Series Temporales Oceánicas de Canarias

[ES]El mantenimiento de observaciones continuadas, durante largos períodos de tiempo en un mismo área, es una estrategia científica y logística de gran interés oceanográfico. El estudio detallado de las series así establecidas, nos permitirá conocer los cambios temporales que tienen lugar tanto en la fisica, como en la biogeoquímica oceánica, y los procesos que ejercen el control de los mismos. Dentro de esta escala temporal, la base de datos hidrográficos que resulta nos ayudará a establecer los ciclos estacionales y los ciclos interanuales del conjunto de parámetros hidrográficos y geoquímicos medidos. El Archipiélago Canario está considerado, dada la combinación de procesos de larga escala que se dan, como una zona óptima para estudios de las aguas oceánicas a escala global. Se encuentra rodeado de aguas profundas inmersas en el régimen de recirculación Este de la Corriente del Golfo, constituido por la Corriente de Canarias, influenciado por el afloramiento del Noroeste Africano y por la deposición de partículas eólicas desde el Sahara.El programa ESTOC supone una contribución a los proyectos internacionales y multidisciplinarios WOCE (World Ocean Circulation Experiment) y JGOFS (Joint Global Ocean Flux Study) que pretenden resolver el problema científico que supone la escasez de información sobre lo que está ocurriendo en los océanos a escala global.

Datos preliminares sobre la reproducción del centollo Maja brachydactyla (Balss, 1922) en condiciones de cultivo en Canarias

[EN] The atlantic spider crab Maja brachydactyla, nowadays overfished, presents good conditions for its production in captivity. In Canary Islands (Spain), under culture conditions, with open flux of water and temperature between 18,8-22,5 ºC from November 2006 to May 2007, the fecundity index was lower than others in higher latitudes, around 100 larvae/female g, for individuals between 270 and 690 g. The incubation time torn out to be similar to colder conditions, but the period between hatching and the next spawning decreased even to 0 days. The annual spawning cycle, unlike the described for Northern Atlantic populations, could range the whole year, with 3, 4 or even more consecutive spawnings

Migración y ecología trófica de peces migradores verticales dominantes del Atlántico nordeste subtropical: implicaciones en el flujo activo de carbono

[EN]Diel vertical migrants (DVMs) are mainly zooplankton and micronekton that migrate upward from 400-700 m depth every night to feed in the productive epipelagic zone and come back at dawn to the mesopelagic zone, where they release the ingested carbon. DVMs should contribute to the biological pump in the ocean and, accordingly, to thevglobal CO2 balance. A large portion of the DVMs biomass are the lanternfishes (myctophidae), which might represent a pathway accounting for a substantial export of organic carbon to the deep ocean. Nevertheless, the magnitude of this transport is still poorly known. The combined study of migration and feeding ecology is a good approach to improve our knowledge of the DVMs role in this active carbon flux. Two dominant myctophids in the Subtropical Eastern North Atlantic Ocean (Hygophum hygomii (Lütken, 1892) and (Lobianchia dofleini (Zugmayer, 1911)) were studied from several surveys carried out around the Canary Islands during the last decade. Our results showed a marked diel vertical migration and a prevailing nocturnal feeding with predation mainly on copepods and euphausiids. The digestion state of prey suggested a slow stomach evacuation rate and that most of the ingested carbon in the epipelagic is efficiently transported to the mesopelagic zone.

Avances en ecofisiología planctónica y oceanografía bioquímica en la ULPGC

[EN] This seminar will report the latest activities of the ULPGC»s Plankton Ecophysiology group (PEG). This group studies respiration, growth, nitrogen metabolism, oceanic carbon flux, deep ocean metabolism, and plankton cultivation. It works with zooplankton, phytoplankton, bacteria, and macroalgae. The premise behind the group»s investigations is that enzyme biochemistry controls an organism»s physiology that, in turn, has a strong impact on ocean chemistry and ecology. This research team (PEG) uses as foils, the metabolic theory of ecology (MTE) and Kleiber»s law to argue the fact that respiratory metabolism is controlled not by biomass, but by the respiratory electron transport system (R-ETS). It has pointed out that the reason, zooplankton respiration statistically correlates with biomass, is because biomass packages mitochondria and mitochondria package the R-ETS. It has demonstrated, experimentally with Artemia salina, the superiority of using ETS as a respiration proxy rather than using biomass. Working with bacteria it has shown the inadequacy of the MTE in describing respiration in different growth phases of bacteria and has shown that a rival model based on enzyme kinetics works much better.

Sobre algunos problemas reales en visión por ordenador que conducen a sistemas de ecuaciones algebraicos

[EN] In this paper we present some real problems which appear in computer vision which yields to nonlinear system of algebraic equations. We study the problem of camera calibration. Roughly speaking camera calibration consists in looking at the camera position in the 3- D world using as information the projection of a 3- D Scene in a 2-D plane (the photogram). The problem is quite different when we use a single view or several views (stereo vision) of the 3-D scene. We will show in this paper how these problems yields to nonlinear algebraic system of equations.

Lithogenic flux and textural analysis of the sediment trap samples collected at 150m in the Canary basin, Spain

Trabajo Finde Título para obtener el Grado en Ciencia del Mar

Carbon flux, nutrient retention efficiency and the curvature of respiration depth-profiles in the ocean water column

Trabajo realizado por: Packard, T. T., Osma, N., Fernández Urruzola, I., Gómez, M

Application of genetic algorithms for the calibration of an air quality model and its validation using pollutant measures from the surroundings of an electric power plant

[EN]This work presents the calibration and validation of an air quality finite element model applied to emissions from a thermal power plant located in Gran Canaria. The calibration is performed using genetic algorithms. To calibrate and validate the model, the authors use empirical measures of pollutants concentrations from 4 stations located nearby the power plant; an hourly record per station during 3 days is available. Measures from 3 stations will be used to calibrate, while validation will use measures from the remaining station…

Calibration and validation of an air quality finite element model around an electric power plant in Gran Canaria island

[EN]This work presents the calibration and validation of an air quality finite element model applied to the surroundings of Jinamar electric power plant in Gran Canaria island (Spain). The model involves the generation of an adaptive tetrahedral mesh, the computation of an ambient wind field, the inclusion of the plume rise effect in the wind field, and the simulation of transport and reaction of pollutants. The main advantage of the model is the treatment of complex terrains that introduces an alternative to the standard implementation of current models. In addition, it improves the computational cost through the use of unstructured meshes...