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  • Authors: Eugenio González, Francisco; Marcello Ruiz, Francisco Javier; Mederos Barrera, Antonio Ramón; Marqués, Ferran;

    Remote spectral imaging of coastal areas can provide valuable information for their sustainable management and conservation of their biodiversity. Unfortunately, such areas are very sensitive to changes due to human activity, natural phenomenona, introduction of non-native species and climate change. Thus, the main objective of this research is the implementation of a robust image processing methodology to produce accurate bathymetry maps in shallow coastal waters using high resolution multispectral WorldView-2/3 satellite imagery for the monitoring at the maximum spatial and spectral resolutions. Two different island ecosystems have been selected for the assessment, since they stand out for their richness in endemic species and they are more vulnerable to climate change: Cabrera National Park and Maspalomas Natural Protected area, located in the Balearic and Canary Islands, Spain, respectively. In addition, a third example to show the applicability of the mapping methodology to monitor the construction of a new port in Granadilla (Canary Islands) is presented. Contributions of this work focus on improving the preprocessing methodology and, mainly, on the proposal and assessment of new satellite derived regression and machine learning bathymetric models, which have been validated and compared with respect to measured reference bathymetry. After a thorough analysis of 9 techniques, using visual and quantitative statistical parameters, ensemble learning approaches have demonstrated excellent performance, even in challenging scenarios up to 35 m depth, with mean RMSE values around 2 m. 2,141 11,0 SCIE 5,6 Q1

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    Authors: Corvo Campodarve, Oriol;
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    Authors: Jose Luis Rueda Ruiz; Javier Urra; Ricardo Aguilar; Lorenzo Angeletti; +14 Authors

    Cold-water corals are recognised as a key component of Mediterranean deep-sea ecosystems but the knowledge of their associated biodiversity is still limited. To date, the fauna associated to the Central Mediterranean cold-water coral habitats is the best known (e.g. the cold-water coral provinces of Santa Maria di Leuca, Bari canyon and Strait of Sicily) but such knowledge should be extended to the whole Mediterranean Basin. The combined biodiversity censed so far for Mediterranean cold-water coral habitats and those of adjacent areas (Strait of Gibraltar-Gulf of Cádiz) includes a conspicuous number of species (ca. 520 spp.) with a high representation of sponges (ca. 90 spp.), polychaetes (ca. 90 spp.), cnidarians (ca. 80 spp.), bryozoans (ca. 75 spp.), crustaceans (ca. 60 spp.), molluscs (ca. 50 spp.), fishes (ca. 50 spp.), echinoderms (ca. 20 spp.) and brachiopods (7 spp.). Most species are not univocally linked to cold-water corals, but they benefit from the complex and diverse microhabitats provided by them. There is a clear need to continue the investigation of Mediterranean cold-water coral habitats to fully document the faunistic inventory, biogeographic connections and functions of the many species connected to such emblematic ecoystems of the deep-sea Peer reviewed

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    Part of book or chapter of book . 2019
    Data sources: ZENODO
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      ZENODO
      Part of book or chapter of book . 2019
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    Authors: Ronda García, Juan Leandro; Benabdeloued, Boualem Youcef Nassim; Tent Manclús, José Enrique;

    Current practices in bathymetry survey in lakes (available method) are indeed having some limitations. As for instance the size of the equipment that has to be transported and then deployed in the lake. New technologies such as using USV (Uncrewed Surface Vessel or Unmanned Surface Vehicle) start to be common. As they are easy to transport, high manoeuvrability and permit to work in less than 1-m-deep water masses. A quite wide commercial offer has been developed for many uses but as this equipment do not have a high demand, it has a high cost. The USV uses in harbours and open marine waters is quite straightforward because the good visibility and easy access permit rescues of the USV in case of malfunction. Lake surveys have the problem of the densely vegetated margins, riparian vegetation, and sometimes also with floating natural/or rubbish elements. Commonly the survey is tracked away from the margins to avoid the possible problems, that in case of occur are major issues (rescue this non-cheap equipment). In these scenarios it is needed to stablish some rescue protocols as, for instance a robe to the USV to pull, or transport a rescue boat to be sure to recover the equipment. Peer Reviewed

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    Authors: Santos, Diogo; Abreu, Tiago; Silva, Paulo A.; Baptista, Paulo;

    When waves propagate in coastal areas they sufer changes in the wavelength and wave direction resulting from the interaction with the sea bottom. In SAR images, the waves can be identify through variations in the gray tones of the image, making it possible to infer the bathymetry from the variations in the wavelength. Commonly, the fast Fourier transform (FFT) is used to estimate the wavelength in domains close to the coast, recognizing, however, that this method has some limitations, mainly for small depths. To overcome the limitations of FFT, this work uses wavelet spectral analysis to estimate bathymetric data. The new image processing methodology shows positive and promising results for mapping shallow marine environments. Peer Reviewed

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    Recolector de Ciencia Abierta, RECOLECTA
    Article . 2021 . Peer-reviewed
    License: CC BY NC ND
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      Recolector de Ciencia Abierta, RECOLECTA
      Article . 2021 . Peer-reviewed
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    Authors: Duarte, J. C.; Valadares, V.; Terrinha, P.; Rosas, F.; +2 Authors

    Recent mapping of the Gulf of Cadiz seafloor permitted to identify major tectonic lineaments: the SWIM lineaments (Zitellini et al., 2009) and Cadiz lineament, striking WNW-ESE and NE-SW, respectively. Multibeam swath bathymetry and interpretation of multi-channel seismic data indicate that these features can be interpreted to correspond to the seafloor morphological expression of active dextral strike-slip faults. Based on the interpreted data and recently published GPS plate kinematic velocity vectors of Nubia with respect to Iberia and the Alboran block (e.g. Fernandes et al.; 2003 Stich et al., 2006) we propose that the SWIM Faults are related to the general NW-SE convergence of Nubia with respect to Iberia, and the Cadiz fault is related to the westward movement of the Gibraltar orogenic arc It is acknowledged the FCT PhD grant provided to support the work of J. Duarte (SFRH/BD/31188/2006) and V. Valadares (SFRH/BD/17603/2004) 5 pages, 3 figures Peer Reviewed

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    OceanRep
    Article . 2009 . Peer-reviewed
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    Authors: Antezana, Tarcisio;

    Las características hidrográficas y los perfiles batimétricos a lo largo del transecto Estrecho de Magallanes a Canal del Beagle se examinaron en relación al origen y circulación de las aguas. Las aguas oceánicas adyacentes fueron más cálidas en el Atlántico y más salinas en el Pacífico. El intercambio de agua parece limitado por bajos y pasos someros. Las aguas interiores fueron más salobres y frías que las aguas oceánicas de la plataforma, presentando una disminución gradual de la salinidad desde el Canal del Beagle al Estrecho de Magallanes y una cuña subsuperficial de agua más caliente y salina por debajo de un núcleo de agua fría y salobre en el Brazo Noroeste. Las aguas subsuperficiales del Estrecho de Magallanes y Brazo Noroeste parecen estar semi-aisladas. La distribución de salinidad y temperatura sugiere que el flujo de aguas calientes y salinas del Pacífico se produce en Bahía Cook. Hacia el oeste y el norte, estas aguas se mezclarían progresivamente con aguas más frías y salobres provenientes de la Cordillera de Darwin. En este sector (Canal Brecknock- Canal Cockburn), la estratificación de la columna de agua fue más débil, y llegó a ser nula hacia el Estrecho de Magallanes (Seno Magdalena-Paso Ancho). La distribución de las propiedades hidrográficas y los perfiles batimétricos fueron consistentes y sugieren la siguiente sub-división de microcuencas a lo largo del transecto Magallanes-Beagle: 1.- Paso Ancho-Seno Magdalena, 2.- Canal Magdalena-Canal Brecknock, 3.- Canal Ballenero-Brazo Noroeste, 4.- Canal del Beagle. Hydrographic features and bottom profiles along the main passages from Paso Ancho in the Straits of Magellan to the Beagle Channel and those of adjacent oceanic waters are examined with regard to water origin and circulation. Sills and shallow entrances likely limited water exchange. Adjacent oceanic waters were warmest in the Atlantic and saltiest in the Pacific sectors. Waters within the inland passages were fresher and cooler than open shelf waters, showing a decreasing salinity gradient between the Beagle Channel and the Straits of Magellan and a subsurface wedge of warmest and saltiest oceanic water underneath a core of cold and brackish water in Brazo Noroeste. Subsurface water masses of the Straits of Magellan and Brazo Noroeste seem to be entrapped. Temperature and density distributions suggest that the inflow of salty and warm Pacific waters takes place through Bahía Cook. Westward and northward toward the Straits of Magellan, these waters may progressively mix with cooler and more brackish waters adjacent to Cordillera de Darwin. In this sector (Canal Brecknock-Canal Cockburn) stratification of the water column was weaker and became zero toward the Straits of Magellan (Seno Magdalena / Paso Ancho). Distribution of water properties was consistent with bathymetry profiles and suggests the following subdivision of microbasins along the Magellan-Beagle passage: 1.- Paso Ancho-Seno Magdalena, 2.- Canal Magdalena-Canal Brecknock, 3.- Canal Ballenero-Brazo Noroeste, 4.- Beagle Channel .

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    Recolector de Ciencia Abierta, RECOLECTA
    Article . 1999 . Peer-reviewed
    License: CC BY
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      Recolector de Ciencia Abierta, RECOLECTA
      Article . 1999 . Peer-reviewed
      License: CC BY
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    Authors: Fernández Rodríguez, Irene;

    Currently, due to the global change and biodiversity loss, the knowledge of the species taxonomy and distribution is more than ever crucial. Especially in areas as the Avilés canyon systems (ACS), which is a Site of Community Importance (SCI) included in the Natura 2000 Network. A check-list of the echinoderm species belonging to the class Holothuroidea (a group that has been less studied and with scarce literature available) from the ACS was carried out, as well as a characterization of the holothurian fauna and its distribution. Samples were collected from both the continental shelf, slope and bathyal zones of the Asturian central coast (COCACE cruise, 1987–88), and the slope, bathyal and abyssal areas of the Avilés canyon systems (BIOCANT cruises, 2012–13). The identification of the species was based on morphological traits as well as on the observation of the microscopic calcareous ossicles extracted from different parts of the holothurian body. One hundred and seventy four specimens, belonging to 35 species of the five orders of the class Holothuroidea, were identified. Multivariate analysis allowed the differentiation of four main assemblages, which corresponded to abyssal plain, lower continental slope, upper continental slope, and continental shelf. Depth was the main structuring agent. Holothurian species richness was higher in deep-sea areas, the abyssal plain being the area with the highest number of species found.

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    Authors: Izquierdo, F. (Francisco); Menezes, R. (Raquel); Wise, L. (Laura); Teles-Machado, A. (Ana); +1 Authors

    Fishery data is one of the most accessible sources of information currently used for ecological studies and stock assessments. Unlike scientific surveys that are usually restricted to a given time of the year, fisheries dependent data is almost continuously available in time. Moreover, the information collected from the fisheries is less expensive and time consuming. However, for use as a relative abundance index, fishery-dependent data requires standardization as catch-per-unit-effort (CPUE) in order to remove the impact of vessel-specific differences and fishing behavior. Understanding the key factors that influence the population dynamics of fish species implies assessment of their spatial distribution and seasonal habitat selection but, spatio-temporal dependence issues are often not explicitly included in the modeling process. This study standardizes sardine fishery-dependent data obtained from the west coast of Portugal as CPUE by means of a Bayesian hierarchical spatio-temporal model using integrated nested Laplace approximation (INLA). This is one of the first studies of the region to provide maps of the relative abundance of this species for all months of the year. The best model included length of the vessel, vessel ID, month, year and location (latitude, longitude), while none of the five environmental covariates (Chl-a, SST, bathymetry, current velocity and direction) were relevant. In terms of spatial distribution, sardines were more abundant in the northern area, especially during the last quarter of the year. The applied methodology has contributed to improve our knowledge of European sardine distribution throughout the year, providing accurate predictive maps and insights into the standardization process of fishery-dependent data that could also be applied to other fish species and areas.

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    Authors: Oliver de Urmeneta, Meishan; Toma, Daniel;

    Nowadays, the need to save the sea is getting more recognized, which is why marine technologies are so important. These can perform different functions complicated by people or help in science studies. 3D photogrammetry can help with different seabed studies, such as marine biology [1] or visualizing the evolution of a marine artificial biotope [2]. Getting the evolution of a marine artificial biotope can help with different issues investigations such as the ecological niche, the functional relationship between biodiversity and ecosystem processes such as production, and the applied problems of nature conservation such as designing nature reserve systems or networks. This work is based on the OBSEA cabled observatory [3], that is part of the European Multidisciplinary Seafloor and water column Observatory (EMSO), and Remote Observation Vehicle (ROV), the underwater Crawler [4], a modified version of the “Wally” platform series. The new ROV is easily deployable for monitoring benthic communities, such as biotopes. The Crawler has an 360º HD camera with a 180º tilt embedded in a glass sphere on the front of the vehicle, allowing a panoramic view (FOV). The control of the Crawler camera has been enhanced with a semiautomatic underwater 3D photogrammetry. Semiautomatic, because the Crawler control and the image taking was automatic, but the photogrammetry part, was manual. For the 3D photogrammetry we have tested different opensource programs, such as Agisoft Metashape, Meshroom, Regard3D and COLMAP. All these programs generate a 3D model through imported images. Images must be taken along the entire surface of the desired object, using different angles and directions, to obtain more or less detail with more or fewer images. We have done a review to choose the best option, and in our case, it was Agisoft Metashape, using the demo version. In this work we present the results obtained through a circular circuit around the biotope, as shown in Figure 1, stopping at different point to take photos at three different angles, close enough to detect details. And, as the photos are taken, the Crawler processes and calibrates them, to create the photogrammetry more easily later. Peer Reviewed

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  • Authors: Eugenio González, Francisco; Marcello Ruiz, Francisco Javier; Mederos Barrera, Antonio Ramón; Marqués, Ferran;

    Remote spectral imaging of coastal areas can provide valuable information for their sustainable management and conservation of their biodiversity. Unfortunately, such areas are very sensitive to changes due to human activity, natural phenomenona, introduction of non-native species and climate change. Thus, the main objective of this research is the implementation of a robust image processing methodology to produce accurate bathymetry maps in shallow coastal waters using high resolution multispectral WorldView-2/3 satellite imagery for the monitoring at the maximum spatial and spectral resolutions. Two different island ecosystems have been selected for the assessment, since they stand out for their richness in endemic species and they are more vulnerable to climate change: Cabrera National Park and Maspalomas Natural Protected area, located in the Balearic and Canary Islands, Spain, respectively. In addition, a third example to show the applicability of the mapping methodology to monitor the construction of a new port in Granadilla (Canary Islands) is presented. Contributions of this work focus on improving the preprocessing methodology and, mainly, on the proposal and assessment of new satellite derived regression and machine learning bathymetric models, which have been validated and compared with respect to measured reference bathymetry. After a thorough analysis of 9 techniques, using visual and quantitative statistical parameters, ensemble learning approaches have demonstrated excellent performance, even in challenging scenarios up to 35 m depth, with mean RMSE values around 2 m. 2,141 11,0 SCIE 5,6 Q1

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    Authors: Corvo Campodarve, Oriol;
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    Authors: Jose Luis Rueda Ruiz; Javier Urra; Ricardo Aguilar; Lorenzo Angeletti; +14 Authors

    Cold-water corals are recognised as a key component of Mediterranean deep-sea ecosystems but the knowledge of their associated biodiversity is still limited. To date, the fauna associated to the Central Mediterranean cold-water coral habitats is the best known (e.g. the cold-water coral provinces of Santa Maria di Leuca, Bari canyon and Strait of Sicily) but such knowledge should be extended to the whole Mediterranean Basin. The combined biodiversity censed so far for Mediterranean cold-water coral habitats and those of adjacent areas (Strait of Gibraltar-Gulf of Cádiz) includes a conspicuous number of species (ca. 520 spp.) with a high representation of sponges (ca. 90 spp.), polychaetes (ca. 90 spp.), cnidarians (ca. 80 spp.), bryozoans (ca. 75 spp.), crustaceans (ca. 60 spp.), molluscs (ca. 50 spp.), fishes (ca. 50 spp.), echinoderms (ca. 20 spp.) and brachiopods (7 spp.). Most species are not univocally linked to cold-water corals, but they benefit from the complex and diverse microhabitats provided by them. There is a clear need to continue the investigation of Mediterranean cold-water coral habitats to fully document the faunistic inventory, biogeographic connections and functions of the many species connected to such emblematic ecoystems of the deep-sea Peer reviewed

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    Part of book or chapter of book . 2019
    Data sources: ZENODO
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    Authors: Ronda García, Juan Leandro; Benabdeloued, Boualem Youcef Nassim; Tent Manclús, José Enrique;

    Current practices in bathymetry survey in lakes (available method) are indeed having some limitations. As for instance the size of the equipment that has to be transported and then deployed in the lake. New technologies such as using USV (Uncrewed Surface Vessel or Unmanned Surface Vehicle) start to be common. As they are easy to transport, high manoeuvrability and permit to work in less than 1-m-deep water masses. A quite wide commercial offer has been developed for many uses but as this equipment do not have a high demand, it has a high cost. The USV uses in harbours and open marine waters is quite straightforward because the good visibility and easy access permit rescues of the USV in case of malfunction. Lake surveys have the problem of the densely vegetated margins, riparian vegetation, and sometimes also with floating natural/or rubbish elements. Commonly the survey is tracked away from the margins to avoid the possible problems, that in case of occur are major issues (rescue this non-cheap equipment). In these scenarios it is needed to stablish some rescue protocols as, for instance a robe to the USV to pull, or transport a rescue boat to be sure to recover the equipment. Peer Reviewed

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    Authors: Santos, Diogo; Abreu, Tiago; Silva, Paulo A.; Baptista, Paulo;

    When waves propagate in coastal areas they sufer changes in the wavelength and wave direction resulting from the interaction with the sea bottom. In SAR images, the waves can be identify through variations in the gray tones of the image, making it possible to infer the bathymetry from the variations in the wavelength. Commonly, the fast Fourier transform (FFT) is used to estimate the wavelength in domains close to the coast, recognizing, however, that this method has some limitations, mainly for small depths. To overcome the limitations of FFT, this work uses wavelet spectral analysis to estimate bathymetric data. The new image processing methodology shows positive and promising results for mapping shallow marine environments. Peer Reviewed

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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Recolector de Ciencia Abierta, RECOLECTA
    Article . 2021 . Peer-reviewed
    License: CC BY NC ND
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