3 documents found, page 1 of 1
“Gone with the wind”: Fatty acid biomarkers and chemotaxonomy of stranded pleus...
Lopes, Ana Rita; Baptista, Miguel; Rosa, Inês; Dionísio, Gisela; Gomes-Pereira, José; Paula, José Ricardo; Figueiredo, Cátia; Bandarra, NarcisaMarine pleustonic species such as the hydrozoans Velella velella and Physalia physalis, are known to drift in the world's oceans driven by winds, currents and tides. Here we present the first chemotaxonomic characterization, based on the fatty acid (FA) profile, of these two charismatic oceanic species that thrive in the interface layer between air and the water column in adult stages. Moreover, we compared the...
Area Estimation of Deep-Sea Surfaces from Oblique Still Images
Dias, Frederico; Gomes-Pereira, José; Tojeira, Inês; Souto, Miguel; Afonso, Andreia; Calado, António; Madureira, Pedro; Campos, AldinoEstimating the area of seabed surfaces from pictures or videos is an important problem in seafloor surveys. This task is complex to achieve with moving platforms such as submersibles, towed or remotely operated vehicles (ROV), where the recording camera is typically not static and provides an oblique view of the seafloor. A new method for obtaining seabed surface area estimates is presented here, using the clas...
Estimation of Seabed Surface Areas from ROV Oblique Still Images
Dias, Frederico; Gomes-Pereira, José; Tojeira, Inês; Pinto Ribeiro, Luísa; Conceição, Patrícia; Calado, António; Afonso, Andreia; Madureira, PedroSince 2008, the Portuguese Task Group for the Extension of the Continental Shelf has been operating the ROV “Luso” (rated for 6000m depth) for geological sampling of the deep North Atlantic seabed, performing surveys on, e.g., seamounts and hydrothermal vent fields. Amongst other sensors, the ROV is equipped with a full HD video camera with which still images of the deep ocean floor are recorded. Fixed on the R...