11 research outputs found
Consequences of the glacier retreat on the trophic ecology of filter feeders and the bentho-pelagic coupling in an Antarctic coastal ecosystem
Cold-water coral ecology in the Cap de Creus submarine canyon (northwestern Mediterranean): 7 years of multidisciplinary research
Benthic ecosystem responses to glacier retreatment process: a 15 years case study at Potter Cove
Cruise Summary Report - MEDWAVES survey. MEDiterranean out flow WAter and Vulnerable EcosystemS (MEDWAVES)
The MEDWAVES (MEDiterranean out flow WAter and Vulnerable EcosystemS) cruise targeted areas under the potential influence of the MOW within the Mediterranean and Atlantic realms. These include seamounts where Cold-water corals (CWCs) have been reported but that are still poorly known, and which may act as essential “stepping stones” connecting fauna of seamounts in the Mediterranean with those of the continental shelf of Portugal, the Azores and the Mid-Atlantic Ridge. During MEDWAVES sampling has been conducted in two of the case studies of ATLAS: Case study 7 (Gulf of Cádiz-Strait of Gibraltar-Alboran Sea) and Case study 8 (Azores).
The initially targeted areas in the Atlantic were: the Gazul Mud volcano, in the Gulf of Cádiz (GoC) area, included in the case study 7, and the Atlantic seamounts Ormonde (Portuguese shelf) and Formigas (by Azores), both part of the case study 8. In the Mediterranean the targeted areas were The Guadiaro submarine canyon and the Seco de los Olivos (also known as Chella Bank) seamount. Unfortunately it was not possible to sample in Guadiaro due to time constraints originated by adverse meteorological conditions which obligate us to reduce the time at sea focusing only in 4 of the 5 initially planned areas.
MEDWAVES was structured in two legs; the first leg took place from the 21st September (departure from Cádiz harbour in Spain) to the 13th October 2016 (arrival in Ponta Delgada, São Miguel, Azores, Portugal took place the 8th of October due to the meteorological conditions that obligated to conclude the first leg earlier as planned). during the Leg 1 sampling was carried out in Gazul, Ormonde and Formigas. The second leg started the 14th October (departure from Ponta Delgada) and finished the 26th October (arrival in Málaga harbour, Spain). MEDWAVES had a total of 30 effective sampling days, being 6 days not operative due to the adverse meteorological conditions experienced during the first leg which forced us to stay in Ponta Delgada from the 08th to the 13th October.
During MEDWAVES the daily routine followed a similar scheme, depending of course on the weather and sea conditions. The main activity during the day, starting early in the morning (around 08:00 AM, once the night activities were finished), was the ROV deployment. Generally a single ROV dive of around 8 hours was performed, however in several occasions two dives were carried out in the same day (see General station list, Appendix II). After the ROV (and sometimes between two dives) the Box Corer and/or Van Veen Grab and/or Multicore was deployed. After these activities, during the night CTD-Rosette deployments and MB was conducted. Accordingly to this schema the scientific personnel worked in the day or in the night watch.
A total of 215 sampling stations have been covered in MEDWAVES, using the following sampling gears: Multibeam echosounder, CTD-Rosette, LADCP, Box Corer, Van Veen Grab, Multicorer and a Remotely Operated Vehicle (ROV). Table 1 sumamrised the number of sampling stations conducted with each gear in each sampling zone. Additionally MB surveys have been conducted during the transits between area
Spotlight on Technology: Development of an autonomous aquaria system for maintaining deep corals
Publicado
The glacier retreat in an Antarctic coastal ecosystem and its impact on the trophic ecology of filter feeders
Life cycle of the jellyfish Rhizostoma pulmo (Scyphozoa: Rhizostomeae) and its distribution, seasonality and inter-annual variability along the Catalan coast and the mar Menor (Spain, NW Mediterranean)
Publicado
Role of suspension feeders in antarctic pelagic-benthic coupling: Trophic ecology and potential carbon sinks under climate change
Sea-ice and coastal glacier loss in the Western Antarctic Peninsula open new ice-free areas. They allowing primary
production and providing new seabed for colonisation, both acting as a negative feedback of climate change.
However, the injection of sediment-laden runoff from the melting of land-terminating glaciers may reduce this
feedback. Changes in particulate matter will affect nutrition and excretion (faeces stoichiometry and properties) of
suspension feeders, reshaping coastal carbon dynamics and pelagic-benthic coupling. Absorption efficiency and
biodeposition of Euphausia superba and Cnemidocarpa verrucosa were quantified for different food treatments and
varying sediment concentrations. Both species showed high overall absorption efficiency for free-sediment diets,
but were negatively affected by sediment addition. High sediment conditions increased krill biodeposition, while it
decreased in ascidians. Energy balance estimation indicated high carbon sink potential in ascidians, but it is
modulated by food characteristics and negatively affected by sediment inputs in the water column
Two-phase flow in pipelines and heat exchangers
SIGLELD:83/02504(Two) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Jellyfish monitoring on coastlines using remote pilotes aircraft
In the last 10 years the number of jellyfish shoals that reach the swimming area of the Mediterranean Sea are increasing constantly. The term “Jellyfish” refers to animals from different taxonomic groups but the Scyphomedusae are within the most significant one. Four species of Scyphomedusae are the most conspicuous ones inhabiting the studied area, the Barcelona metropolitan area. Jellyfish are usually found at the surface waters, forming big
swarms. This feature makes possible to detect them remotely, using a visual camera and image processing algorithms. In this paper we present the characteristics of a remote piloted aircraft capable to perform monitoring flights during the whole summer season. The requirements of
the aircraft are to be easy to operate, to be able to flight at low altitude (100 m) following the
buoy line (200 m from the beach line) and to be save for other users of the seaside. The remote
piloted aircraft will carry a vision system and a processing board able to obtain useful
information on real-time