Ondas internas en el golfo de Cádiz: implicaciones oceanográficas y morfosedimentarias

Texto en inglés de los capítulos 3,4 y 5.El objetivo principal de la presente Tesis doctoral, es el análisis de la variabilidad temporal que gobierna el régimen de corrientes y otras propiedades físicas en el Golfo de Cádiz, poniendo especial énfasis en el papel que tienen los procesos de corta escala espacio-temporal, como los fenómenos de ondas internas generadas en el talud, en la definición de estas estructuras, y en su influencia en la morfología del talud continental. El conocimiento del papel de las corrientes de fondo y los procesos oceanográficos asociados, incluyendo procesos intermitentes (mareas, ondas internas, …), está evolucionando rápidamente. Muchos de estos procesos son poco conocidos, en parte debido a que las observaciones directas son limitadas, si bien pueden generar importantes rasgos deposicionales y/o erosivos a escalas temporales de corto o largo periodo. Para un mejor conocimiento de la sedimentación marina profunda se requiere la interpretación de estos procesos oceanográficos, cuál es su evolución espacial y temporal, cómo afectan a las corrientes de fondo y cómo se ven afectados por la topografía submarina. Sin embargo, dada su complejidad y su variable naturaleza tridimensional y temporal, es necesario que estos procesos se integren en un marco oceanográfico y climatológico con un enfoque multidisplinar que incluya la Geología y la oceanografía Física. Esta integración requiere de una mayor compilación de datos oceanográficos y un mejor conocimiento de la morfología del fondo marino. Con esta tesis se pretende avanzar en el conocimiento de la importancia que tienen los procesos de corto periodo, abordando su estudio desde dos puntos de vista: i) El análisis de las observaciones obtenidas en campañas oceanográficas y en fondeos; ii) Su correlación con los rasgos morfosedimentarios del talud del Golfo de Cádiz

Sea Cucumber (Holothuria arguinensis) as a Shelter for Juvenile Fish (Diplodus bellottii) in the Gulf of Cadiz (Southwestern Spain)

During a diving survey on soft-bottom habitats in the Gulf of Cadiz (Southwestern Spain), the use of the sea cucumber Holothuria arguinensis (Echinodermata, Holothuriidae) as a shelter by juvenile Senegal's sea bream Diplodus bellottii (Chordata: Sparidae) was observed. Eight juvenile sea bream D. bellottii were videoed sheltering under the sea cucumber's body. This observation highlights the importance of sea cucumbers as a shelter for juvenile fish, providing a microhabitat to take refuge from predators. This is the first report of juvenile sea bream sheltered by a sea cucumber

Sea Cucumber (Holothuria arguinensis) as a Shelter for Juvenile Fish (Diplodus bellottii) in the Gulf of Cadiz (Southwestern Spain)

During a diving survey on soft-bottom habitats in the Gulf of Cadiz (Southwestern Spain), the use of the sea cucumber Holothuria arguinensis (Echinodermata, Holothuriidae) as a shelter by juvenile Senegal’s sea bream Diplodus bellottii (Chordata: Sparidae) was observed. Eight juvenile sea bream D. bellottii were videoed sheltering under the sea cucumber’s body. This observation highlights the importance of sea cucumbers as a shelter for juvenile fish, providing a microhabitat to take refuge from predators. This is the first report of juvenile sea bream sheltered by a sea cucumber

ShetlandsUAVmetry: unmanned aerial vehicle-based photogrammetric dataset for Antarctic environmental research

Abstract The study of the functioning and responses of Antarctica to the current climate change scenario is a priority and a challenge for the scientific community aiming to predict and mitigate impacts at a regional and global scale. Due to the difficulty of obtaining aerial data in such extreme, remote, and difficult-to-reach region of the planet, the development of remote sensing techniques with Unmanned Aerial Vehicles (UAVs) has revolutionized polar research. ShetlandsUAVmetry comprises original datasets collected by UAVs during the Spanish Antarctic Campaign 2021–2022 (January to March 2022), along with the photogrammetric products resulting from their processing. It includes data recorded during twenty-eight distinct UAV flights at various study sites on Deception and Livingston islands (South Shetland Islands, Antarctica) and consists of a total of 15,691 high-resolution optical RGB captures. In addition, this dataset is accompanied by additional associated files that facilitate its use and accessibility. It is publicly accessible and can be downloaded from the figshare data repository

Dataset Processing Template (Pix4D)

Pix4D template employed for the photogrammetric processing

ShetlandsUAVmetry: Deception Island Part 2

The data has been structured according to the study sites, encompassing two top-level folders named “Deception Island” and “Livingston Island”, respectively. Within the main top-level folders, different subfolders named after the flight sites contain the photogrammetric products. This part includes the following datasets: - 20220129_D_WHALERSBAY - 20220130_D_PENDULUMCOVE - 20220131_D_MURATUR

ShetlandsUAVmetry: Livingston Island Part 1

The data has been structured according to the study sites, encompassing two top-level folders named “Deception Island” and “Livingston Island”, respectively. Within the main top-level folders, different subfolders named after the flight sites contain the photogrammetric products. This part includes the following datasets: - 20220211_L_HANNAHPOINT - 20220212_L_BAEJCI - 20220214_L_ARGENTINIANCOVE - 20220214_L_JOHNSONSDOC