10 results on '"Martín-Díaz, Juan Pablo"'
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2. Unveiling the inherent physical-chemical dynamics: Direct measurements of hydrothermal fluid flow, heat, and nutrient outflow at the Tagoro submarine volcano (Canary Islands, Spain)
- Author
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Martín-Díaz, Juan Pablo, González-Vega, Alba, Barreyre, Thibaut, Cornide, Bernardo, Arrieta, Jesús M., Vázquez, Juan-Tomás, Palomino, Desirée, Lozano Rodríguez, José A., Escánez-Pérez, José, Presas-Navarro, Carmen, and Fraile-Nuez, Eugenio
- Published
- 2024
- Full Text
- View/download PDF
3. Ten Years of Intense Physical–Chemical, Geological and Biological Monitoring Over the Tagoro Submarine Volcano Marine Ecosystem (Eruptive and Degassing Stages)
- Author
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Fraile-Nuez, Eugenio, Santana-Casiano, J. Magdalena, González-Dávila, Melchor, González-Vega, Alba, Vázquez, Juan Tomás, Sotomayor-García, Ana, Ferrera, Isabel, Santana-González, Carolina, Eugenio, Francisco, Marcello, Javier, Hernández-León, Santiago, Bakalis, Evangelos, Rueda, José L., Gómez-Ballesteros, María, Álvarez-Valero, Antonio M., Sánchez-Guillamón, Olga, Palomino, Desirée, Tello, Olvido, Presas-Navarro, Carmen, Escánez-Pérez, José, González-Porto, Marcos, Fernández de Puelles, María Luz, Olivé-Abelló, Anna, Vinha, Beatriz, Machín, Francisco, Martín-Díaz, Juan Pablo, Arrieta, Jesús M., Cimarelli, Corrado, Series Editor, Mueller, Sebastian, Series Editor, and González, Pablo J., editor
- Published
- 2023
- Full Text
- View/download PDF
4. Unveiling the inherent physical-chemical dynamics: Direct measurements of hydrothermal fluid flow, heat, and nutrient outflow at the Tagoro submarine volcano (Canary Islands, Spain)
- Author
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Ministerio de Ciencia e Innovación (España), CSIC - Instituto Español de Oceanografía (IEO), Martín-Díaz, Juan Pablo, González-Vega, Alba, Barreyre, Thibaut, Cornide, Bernardo, Arrieta López de Uralde, Jesús M., Vázquez, Juan Tomás, Palomino, Desirée, Lozano Rodríguez, José Antonio, Escánez, José, Presas-Navarro, Carmen, Fraile-Nuez, Eugenio, Ministerio de Ciencia e Innovación (España), CSIC - Instituto Español de Oceanografía (IEO), Martín-Díaz, Juan Pablo, González-Vega, Alba, Barreyre, Thibaut, Cornide, Bernardo, Arrieta López de Uralde, Jesús M., Vázquez, Juan Tomás, Palomino, Desirée, Lozano Rodríguez, José Antonio, Escánez, José, Presas-Navarro, Carmen, and Fraile-Nuez, Eugenio
- Abstract
Tagoro is one of the few submarine volcanoes in the world that has been monitored since its early eruptive stage in 2011 to present day. After six multidisciplinary oceanographic cruises conducted between 2014 and 2023 to gather a comprehensive dataset of georeferenced video-imagery and in situ measurements of hydrothermal flow velocities and hydrothermal fluid samples, we provide a robust characterization of the ongoing hydrothermal fluid velocity, heat flux, and nutrient release, along with an accurate delimitation of the hydrothermal field area. Our results reveal that Tagoro hydrothermal system extends from the main hydrothermal crater up to the summit, covering an area of 7600 m2. This hydrothermal field comprises thousands of small individual vents, displaying diverse morphologies such as crevices and delicate chimney-like structures, irregularly scattered across the dominant diffuse venting surface. Hydrothermal fluid temperatures and velocities at the substratum level reveal a clustered spatial distribution, ranging from 21.0 to 33.3 °C and 1.6–26.8 cm min−1, respectively. Furthermore, our findings indicate a discernible correlation between hydrothermal fluid temperature and vent density, while significant differences were observed between velocities from diffuse and focused areas. Additionally, heat fluxes exceed 200 MW across the entire active region, with heat flux values ranging from 6.06 to 146.87 kW m−2 and dissolve inorganic nutrient concentrations exhibit significant enrichments, comparable to the magnitude of important nutrient sources in the area as upwelling systems or mesoscale structures.
- Published
- 2024
5. Supplementary material to: Unveiling the inherent Physical-Chemical Dynamics: Direct Measurements of Hydrothermal Fluid Flow, Heat, and Nutrient Outflow at the Tagoro Submarine Volcano (Canary Islands, Spain)
- Author
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Martín-Díaz, Juan Pablo, González-Vega, Alba, Barreyre, Thibaut, Cornide, Bernardo, Arrieta López de Uralde, Jesús M., Vázquez, Juan Tomás, Palomino, Desirée, Lozano Rodríguez, José Antonio, Escánez, José, Presas-Navarro, Carmen, Fraile-Nuez, Eugenio, Martín-Díaz, Juan Pablo, González-Vega, Alba, Barreyre, Thibaut, Cornide, Bernardo, Arrieta López de Uralde, Jesús M., Vázquez, Juan Tomás, Palomino, Desirée, Lozano Rodríguez, José Antonio, Escánez, José, Presas-Navarro, Carmen, and Fraile-Nuez, Eugenio
- Published
- 2024
6. Impacts of the volcanic eruption in La Palma (Canary Islands) on the nearby marine bacterioplankton communities
- Author
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Ferrera, Isabel, Salles, Soluna, Cabello, Ana María, Martín-Díaz, Juan Pablo, González-Vega, Alba, Román, Alejandro, Huertas, I. Emma, Tovar-Sánchez, Antonio, Navarro, Gabriel, Arrieta López de Uralde, Jesús M., Fraile-Nuez, Eugenio, Ferrera, Isabel, Salles, Soluna, Cabello, Ana María, Martín-Díaz, Juan Pablo, González-Vega, Alba, Román, Alejandro, Huertas, I. Emma, Tovar-Sánchez, Antonio, Navarro, Gabriel, Arrieta López de Uralde, Jesús M., and Fraile-Nuez, Eugenio
- Abstract
The volcanic eruption that occurred in La Palma Island (Canary Islands, Spain) in 2021 resulted in molten lava flowing into the ocean and forming a delta in the coastline, besides the emission of large amounts of ashes being deposited in a vast area around the Canary Islands. In order to assess the effects of the eruption on seawater, two oceanographic cruises were carried out, one at the beginning of the eruption and a second one a month later. We used an oceanographic CTD rosette sampler for collecting seawater in different areas of La Palma coastline together with Unmanned Aerial Vehicles (UAVs) equipped with a sampling device to collect surface samples near the delta newly formed on the coastal fringe. We sequenced the 16S rRNA gene in order to assess the response of bacterioplankton to such natural disturbance. The results show that the abundance of Thiomicrospirales, Gammaproteobacteria capable of oxidizing poly-metal sulfides, increased significantly in UAV samples collected near the lava delta. Moreover, in stations where the largest physical-chemical anomalies were recorded with the CTD, sequence data showed drastic changes in the prokaryotic community structure; cyanobacterial abundance decreased while the ammonia-oxidizing archeon Nitrosopelagicus and the bacterial SAR324 clade, with potential sulfur-based chemolithoautotrophic lifestyle, dominated the communities. The combined used of shipboard operations and UAVs provided a unique opportunity to study the prokaryotic response to a massive lava input, an event that is rarely observed and sampled in real time.
- Published
- 2023
7. Driving forces that structure sublittoral macrobenthic communities in sandy beaches along environmental gradients
- Author
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Universitat Politècnica de València. Departamento de Ingeniería Hidráulica y Medio Ambiente - Departament d'Enginyeria Hidràulica i Medi Ambient, Universitat Politècnica de València. Instituto de Investigación para la Gestión Integral de Zonas Costeras - Institut d'Investigació per a la Gestió Integral de Zones Costaneres, Universitat Politècnica de València. Instituto Universitario de Ingeniería del Agua y del Medio Ambiente - Institut Universitari d'Enginyeria de l'Aigua i Medi Ambient, Universitat Politècnica de València, Escrivá, Julia, Rodilla, M, Martín-Díaz, Juan Pablo, Estruch, V. D., Sebastiá-Frasquet, M.-T., Llario, Ferran, Falco, S., Universitat Politècnica de València. Departamento de Ingeniería Hidráulica y Medio Ambiente - Departament d'Enginyeria Hidràulica i Medi Ambient, Universitat Politècnica de València. Instituto de Investigación para la Gestión Integral de Zonas Costeras - Institut d'Investigació per a la Gestió Integral de Zones Costaneres, Universitat Politècnica de València. Instituto Universitario de Ingeniería del Agua y del Medio Ambiente - Institut Universitari d'Enginyeria de l'Aigua i Medi Ambient, Universitat Politècnica de València, Escrivá, Julia, Rodilla, M, Martín-Díaz, Juan Pablo, Estruch, V. D., Sebastiá-Frasquet, M.-T., Llario, Ferran, and Falco, S.
- Abstract
[EN] Sandy beaches are very dynamic and changeable environments that present a wide variety of life forms, and, in some areas, high productivity. In the Gulf of Valencia (Western Mediterranean Sea, Spain) these areas have endured an economically important shellfishery of clams (Donax trunculus and Chamelea gallina). In the Mediterranean, a sea with a notable oligotrophic character, rivers are particularly important because of the contributions of fresh water that carry nutrients and organic matter to coastal ecosystems. Consequently, close to the mouths of the rivers, it is possible to investigate the functions of physical, chemical and biological gradients on the macrofauna structuring of sandy beach communities. The objective of this study was to determine the response of sublittoral benthic communities to environmental variables in microtidal intermediate sandy beaches of the south of the Gulf of Valencia. Samples of benthic macrofauna, water and sediment were collected at 5 stations located in the sublittoral zone at different distances to freshwater sources, each one sampled at five depths, in three sampling campaigns. In general, the physicochemical and nutritional variables of water showed a spatial variation alongshore, and only a few variables (dissolved inorganic nitrogen, suspended solids and salinity) also had an across-shore variation. This variability was due to the different freshwater contributions. The sediment variables (mean grain size and organic matter) presented clear patterns related to depth. With respect to the macrofauna, positive relationships with depth were observed for the total density, density of bivalves, polychaetes, crustaceans and C. gallina, while D. trunculus showed the opposite pattern. The proximity to freshwater sources, favoured a greater abundance of organisms. Regarding temporal variation, two very different phytoplanktonic compositions between winter and summer could be distinguished, while, for the macrofauna, difference
- Published
- 2020
8. Estudio de la efectividad de substratos artificiales como lugares de puesta de sepia y calamar
- Author
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Rodilla Alamá, Miguel, Martín Díaz, Juan Pablo, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, Universitat Politècnica de València. Departamento de Ingeniería Hidráulica y Medio Ambiente - Departament d'Enginyeria Hidràulica i Medi Ambient, Feliu Tena, Blanca, Rodilla Alamá, Miguel, Martín Díaz, Juan Pablo, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, Universitat Politècnica de València. Departamento de Ingeniería Hidráulica y Medio Ambiente - Departament d'Enginyeria Hidràulica i Medi Ambient, and Feliu Tena, Blanca
- Abstract
Las capturas pesqueras de cefalópodos se han incrementado a nivel global. Los pescadores artesanales de Gandia explotan un “metier” de sepia capturada con trasmallo. Las capturas de esta pesquería han oscilado considerablemente de un año a otro y se percibe un descenso en capturas en el último periodo. En la gestión de las pesquerías de cefalópodos se plantea incrementar los hábitats que favorecen las puestas, puesto que la mayoría de las capturas por pesca artesanal se asocian a los hábitos y periodo reproductor. En este trabajo, se evalúa el efecto de substratos artificiales para favorecer la puesta de sepia (Sepia officinalis) y calamar (Loligo vulgaris y Loligo forbesi) sobre arenas, la influencia batimétrica y la posibilidad de recuperar las puestas que han sido fijadas en artes de pesca y que habitualmente se perderían. Los resultados muestran que es factible recuperar los huevos fijados en las redes e incrementar el éxito reproductor de las especies. Hay preferencia de los calamares por substratos más profundos, superiores a 10 metros, mientras que la sepia utiliza los más superficiales hasta -10 m. La sepia utiliza los substratos más complejos, mientras que los calamares utilizan substratos sencillos, siendo útiles las boyas de profundidad., Fishing catches of cephalopods have been increasing during the last years globally. The artisanal fishermen from Gandía operate a “metier” that corresponds to the catches of cuttlefish throughout driftnet. Catches by these fisheries have fluctuated significantly from one year to another and it has been perceived a decrease of catches in the last period. People responsible of the management of the fishing cephalopods are considering increasing the habitats that favour their spawning because the majority of the catches by artisanal fisheries are associated to the habitats and the reproductive period of these species. On this project, it has been evaluated the effects of the artificial substrates that stimulate the spawning of cuttlefish (Sepia officinalis) and squid (Loligo vulgaris and Loligo forbesi) on sandy bottoms. In addition, it has been also studied the influence of bathymetry on these substrates and the possibility of recovering the spawning that has been fixed on driftnets and it would be thrown out. The results have shown that it is possible to recover the eggs fixed on driftnets and to increase the reproductive success of these species. The squids prefer substrates on major depths, among 10 meters and more deep zones. The cuttlefishes prefer superficial depths, 10 meters maximum. The substrates used by cuttlefishes are more complex, while squids need simpler substrates for which are useful the deep buoy
- Published
- 2016
9. Estudio de la influencia de factores físicos, químicos y nutricionales en la distribución de la macrofauna bentónica
- Author
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Martín Díaz, Juan Pablo
- Subjects
Indice MEDOCC ,Soft-bottom ,Aportes continentales ,Fondos blandos ,Continental Inputs ,Estructura de la Comunidad ,Mediterráneo ,TECNOLOGIA DEL MEDIO AMBIENTE ,Máster Universitario en Evaluación y Seguimiento Ambiental de Ecosistemas Marinos y Costeros-Màster Universitari en Avaluació i Seguiment Ambiental D'Ecosistemes Marins i Costaners - Abstract
La morfología de las playas arenosas, junto a las variables ambientales y factores biológicos, condicionan una determinada distribución de la comunidad macrobentónica. Estos elementos varían temporalmente y a lo largo y ancho de la playa. Por ello, la comunidad se ve sometida a diferentes tensiones, produciéndose ajustes en la estructura de la comunidad. Este trabajo se estructuró en 2 periodos temporales (época seca y época húmeda) y en 2 estaciones de muestreo (a 200 y 1000 m al sur de una zona de aportes continentales) a profundidades comprendidas entre 0,5 y 4 m, donde se caracterizó la composición de la macrofauna bentónica. Además, se estudiaron numerosas variables ambientales y se realizó un análisis estadístico. Los valores de riqueza específica, diversidad y abundancia aumentaron con la profundidad. La influencia de los aportes continentales no se observó entre las 2 campañas, aunque sí entre las dos estaciones de la época húmeda, obteniéndose valores superiores de riqueza, abundancia y diversidad en la estación más cercana a los mismos. Estos resultados fueron principalmente regulados por el tamaño del sedimento, temperatura y dimensión de los aportes., Sandy beach morphology, environmental and biotic factors have a crucial role on the benthic macrofauna distribution. These factors can change on time and alongshore and across-shore. For that, community is under some different pressures what trigger modifications on the structure of the benthic macrofauna. This research was developed in 2 different periods (dry and wet season) over 2 sampling stations (200 and 1000 m from the continental inputs). Each station was sampled between 0,5 and 4 m depth, to study the macrofauna community structure. Furthermore, several environmental variables were studied and statistical analysis was done. Species richness, diversity and abundance were larger across-shore. Although influence of continental inputs between the 2 temporal periods was not detected, this was observed between the 2 sampling stations, showing species richness, diversity and abundance values higher at the nearest sampling station to the continental inputs. These results were mainly regulated by sediment size, temperature and continental inputs.
- Published
- 2014
10. Estudio de la influencia de factores físicos, químicos y nutricionales en la distribución de la macrofauna bentónica
- Author
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Falco Giaccaglia, Silvia Laura, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, Martín Díaz, Juan Pablo, Falco Giaccaglia, Silvia Laura, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, and Martín Díaz, Juan Pablo
- Abstract
La morfología de las playas arenosas, junto a las variables ambientales y factores biológicos, condicionan una determinada distribución de la comunidad macrobentónica. Estos elementos varían temporalmente y a lo largo y ancho de la playa. Por ello, la comunidad se ve sometida a diferentes tensiones, produciéndose ajustes en la estructura de la comunidad. Este trabajo se estructuró en 2 periodos temporales (época seca y época húmeda) y en 2 estaciones de muestreo (a 200 y 1000 m al sur de una zona de aportes continentales) a profundidades comprendidas entre 0,5 y 4 m, donde se caracterizó la composición de la macrofauna bentónica. Además, se estudiaron numerosas variables ambientales y se realizó un análisis estadístico. Los valores de riqueza específica, diversidad y abundancia aumentaron con la profundidad. La influencia de los aportes continentales no se observó entre las 2 campañas, aunque sí entre las dos estaciones de la época húmeda, obteniéndose valores superiores de riqueza, abundancia y diversidad en la estación más cercana a los mismos. Estos resultados fueron principalmente regulados por el tamaño del sedimento, temperatura y dimensión de los aportes., Sandy beach morphology, environmental and biotic factors have a crucial role on the benthic macrofauna distribution. These factors can change on time and alongshore and across-shore. For that, community is under some different pressures what trigger modifications on the structure of the benthic macrofauna. This research was developed in 2 different periods (dry and wet season) over 2 sampling stations (200 and 1000 m from the continental inputs). Each station was sampled between 0,5 and 4 m depth, to study the macrofauna community structure. Furthermore, several environmental variables were studied and statistical analysis was done. Species richness, diversity and abundance were larger across-shore. Although influence of continental inputs between the 2 temporal periods was not detected, this was observed between the 2 sampling stations, showing species richness, diversity and abundance values higher at the nearest sampling station to the continental inputs. These results were mainly regulated by sediment size, temperature and continental inputs.
- Published
- 2014
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