cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17882/61487
title: Effects of whale-based tourism in Vava’u, Kingdom of Tonga: Behavioural responses of humpback whales to vessel and swimming tourism activities

description: Vava’u, Kingdom of Tonga, is a well-established whale-watching destination in the South Pacific. Between July and October, the waters around the archipelago represent one of the most important breeding grounds for Oceania humpback whales (Megaptera novaeangliae). The Tongan government allows tourist swimming activities with whales and tour operators strongly promote the practice of swimming-with-whales, focusing primarily on mother-calf pairs. However, there is increasing evidence, derived from empirical research on swim-with-cetacean tourism, that this kind of interaction affects cetacean behaviour and can lead to negative effects on the cetaceans involved. This study represents the first assessment of humpback whales’ behavioural responses to vessel and swimmer approaches in Vava’u. Fifty-six surveys took place during the 2016 and 2017 whale breeding seasons aboard dedicated research and tour vessels. Whale dive time, number of reorientation events, and respiration rates were documented in both the absence and presence of boats and swimmers. Vessel approach type, swimmer placement, and whale avoidance responses were also recorded. Results indicate that the average diving time and the proportion of time spent diving in the presence of swimming activities increased significantly for mother-calf pairs (F2,36 = 18.183, P &lt; 0.001; F2,36 = 5.462, P = 0.009, respectively). Moreover, avoidance responses of whales towards tour vessels were observed for one third of vessel approaches (33.5%) and the avoidance rate was significantly affected by the boat approach type (95% CI: 20.7 – 69.2%, z = 3.50, P &lt; 0.001). Finally, low levels of compliance to the existing Tongan swim-with-whales regulations were documented, in particular the stipulated whale resting time between interactions with tour operator vessels and swimmers was often not respected (38.4%). Vava’u is an important calving ground for the Oceania humpback whale population and these findings should be carefully considered by stakeholders in Tonga and at other locations where swim-with-whales opportunities are being undertaken. Effective strategies to reduce the risk of detrimental effects on the whales targeted by swimming activities, especially mother-calf pairs, are needed.
DOI: 10.17882/61374
title: Spatial variations in the stable isotope composition of the green algae, Halimeda tuna, on Conch Reef, Florida Keys, USA and implications for paleothermometry

description: On Conch Reef, Florida Keys, USA we examine the interaction of local hydrography and the complex reef topography on the pattern of stable isotope (δ18O and δ13C) signatures in the benthic green algae, Halimeda tuna. During the summer months, benthic temperatures show high-frequency fluctuations associated with the arrival of internal waves that advect cool, nutrient rich water across the reef slope. The nutrient and temperature regime available for H. tuna growth across the reef is modified by the interaction between local water flow and reef morphology and results in a highly heterogenous growth environment even within isobaths. This environmental heterogeneity in then reflected in the large variability in isotopic signatures even among closely located individuals. Comparing the temperature measured across the reef front with that predicted by the δ18O isotopic thermometer suggests complex interactions between the environment and Halimeda carbonate formation at temporal and spatial scales not normally considered in mixed or averaged sediment samples. The divergence in estimated temperature range between measured and predicted temperatures emphasizes species and location specific temperature relationships. The relatively light δ18O signatures, compared to other model measurements, may also indicate freshwater input at Conch Reef. These observations illustrate the need to consider this spatial heterogeneity in contemporary as well as ancient reef settings that are influenced by a similar, highly variable physical environment.
DOI: 10.17882/61347
title: Distribution of Scleractinia (Madrepora oculata and Lophelia pertusa) reported between 1995 and 2013 in the French Mediterranean Sea

description: In the Mediterranean deep-sea two scleractinian species, Lophelia pertusa (= Desmophyllum pertusum) and Madrepora oculata, make up the dominant structure-forming corals. The Lacaze-Duthiers canyon is the only French Mediterranean canyon where the two species L. pertusa and M. oculata have been observed living together in large quantities, the situation generally described for the biocoenosis of cold-water corals (CWC). In this canyon large colonies (more than 40 cm) of both species of scleractinians were observed at depths ranging from 246 m to 541 m at the head of the canyon and its western flank. The second canyon is the Cassidaigne canyon, where M. oculata seems to be the only structure-forming scleractinian there. The largest concentration of M. oculata colonies was observed on the west flank of the canyon along a crest at depths ranging from 200 to 210 m. Mature M. oculata colonies attained heights up to 40 cm. M. oculata were observed in three other canyons: Bourcart, Sicié and Var. In the Bourcart canyon, M. oculata was observed on a shelf of hard substratum at 331 m depth. Several single branches protruded from a slab. In the Sicié canyon a 15-cm colony of M. oculata was observed at 255 m depth, while in the Var canyon, three young branches 2 cm long were seen growing at 350 m depth on a wall of hard rock.
DOI: 10.17882/61336
title: Seismological data from Chile after the 2010 Mg 8.8 earthquake

description: Short period ocean bottom seismometer data recording aftershocks of the Chile after the 2010 Mg 8.8 earthquake. File format is SAC.
DOI: 10.17882/61301
title: La Palma landslide tsunami: computation of the tsunami source with a calibrated multi-fluid Navier-Stokes model and wave impact assessment with propagation models of different types

description: Data corresponding to tsunami sources of potential La Palma collapse scenario for slide volumes of 20, 40, 80, and 450 km3. The initiation of the slide is modeled using THETIS, a 3D Navier-Stokes model. The slide is considered as a Newtonian fluid whose viscosity is adjusted to approximate a granular behavior. After 5 minutes of propagation with THETIS, the generated water wave is transferred into FUNWAVE-TVD for 15 minutes fo Boussinesq model simulation. Wave elevation and water velocity at this point in time, 20 minutes after the start of the flank collapse, are provided.
DOI: 10.17882/61299
title: Tissue damage and tissue localisation of the bacteria Vibrio aestuarianus during an experimental infection (oyster Crassostrea gigas)

description: Histopathological damage and localisation of Vibrio aestuarianus in diverse oyster tissues were studied on experimentally infected animals by histology and immunohistochemistry with a polyclonal antibody. Histological slides were scaned and are here presented. On day 1, V. aestuarianus was detected as few foci in the gills of 5 out of 14 animals. Nevertheless, as early as this first day after bacterial contact, first signs of histological damage were observed. These lesions could be classified into three classes: (type 1) lysis of the sub-epithelial connective tissue in the mantle, (type 2) epithelial atrophy of digestive diverticula with dilation of the diverticulum lumen and (type 3) haemocyte lysis and/or infiltration by haemocytes and/or haemocyte agglutination in haemolymph vessels. In oysters immersed in bacterial bath and sampled on day 4, intense colonization of all oyster tissues was observed. To be precise, stained bacteria-like cells were detected (i) in gills, as attached to epithelial cells or as isolated cells, (ii) around the digestive gland in connective tissues as well as attached or inside epithelial cells of the digestive tissue, (iii) in the mantle, in clusters in connective tissues, (iv) in between muscular fibres of the adductor muscle and (v) in the periphery of the sinus, vein or artery of different tissues. The disease progression on day 4 was associated with an increase of affected animals for the 3 types of lesions, as well as an increase in lesion intensity (an increase in the number of affected areas and significant atrophy of the digestive diverticula epithelium as compared with the control). Finally, damage intensity increased reaching a maximum in moribund animals, in which V. aestuarianus was detected in every tissue of all the tested animals. These results confirmed the septicaemic characteristics of V. aestuarianus infection.
DOI: 10.17882/61229
title: Hydromedusae abundance in the temperate Southwestern Atlantic from 1983 to 2014

description: Hydomedusae abundance data collected along the Southwestern Atlantic (27°-56°S) during late spring and summer from 1983 to 2014. Sampling location Latitude (-55,10002;-26,73335),Longitude (-69,20004;-45,00667)
DOI: 10.17882/61214
title: Drake current-meter mooring velocity data (2008-2009)

description: Five current meter moorings (M1 through M5) were deployed in the Norther Drake Passage in April 2008 (DRAKE 2008, ANT-XXIV/3) from RV Polarstern on her way from Bellingshausen station (King George Island) to Punta Arenas. The moorings were placed along ground track #104 of Jason altimetry satellite. They were retrieved in March-April 2009 from RV Polarstern (DRAKE 2009, ANT-XXV/4) on her way south from Punta Arenas to Jubany. The five moorings were successfully recovered. This data set is made of the velocity times series from the 5 moorings.
DOI: 10.17882/61186
title: Drake current-meter mooring velocity data (2006-2008)

description: Ten current meter moorings (M1 through M10) were deployed in the Drake Passage in January 2006 (DRAKE 2006, ANT-XIII/3) from RV Polarstern on her way south from Punta Arenas to Jubany station (King-George Island) and Bernardo O Higgins Station (Antarctic Peninsula). The moorings were placed along ground track #104 of Jason altimetry satellite. Recovery took place in April 2008 (Drake 2008, ANT-XXIV/3) from RV Polarstern on her way from Bellingshausen station (King George Island) to Punta Arenas. Moorings M2 and M8 could not be recovered (flotation issues). This data set is made of the velocity time series from 8 moorings.
DOI: 10.17882/60891
title: Intertidal and Subtidal Macroalgae taxa data in ODV format from DCE-Benthos Network

description: French intertidal and subtidal Macroalgae taxa data are collected during monitoring surveys on the English Channel / Bay of Biscay coasts. Protocols are implemented in the Water Framework Directive. Data are transmitted in a Seadatanet format (CDI + ODV) to EMODnet Biology european database. 131 ODV files have been generated from period 01/01/2006 to 31/12/2021.
DOI: 10.17882/60892
title: Zostera Marina et Zostera Noltei abundance data in ODV format from French REBENT Network

description: French Zostera Marina et Zostera Noltei abundance data are collected during monitoring surveys on the English Channel / Bay of Biscay coasts. Protocols are impletmented in the Water Framework Directive. Data are transmitted in a Seadatanet format (CDI + ODV) to EMODnet Biology european database. 35 ODV files have been generated from period 01/01/2004 to 31/12/2021 for Z. Marina and from 01/01/2011 to 31/12/2021 for Z. Noltei.
DOI: 10.17882/60681
title: Benthic invertebrates abundance data from French coasts in ODV format

description: French benthic invertebrates composition and abundance taxa data are collected during monitoring surveys on the English Channel / Bay of Biscay coasts and Mediterranean coast (Quadrige program code : REBENT_FAU, RSL_FAU). Protocols are implemented in the Water Framework Directive. Data are transmitted in a Seadatanet format (CDI + ODV) to EMODnet Biology european database. 498 ODV files have been generated from period 01/01/2003 to 31/12/2021.
DOI: 10.17882/60664
title: Reproductive cycle of the blue jack mackerel, Trachurus picturatus (Bowdich, 1825), off the Portuguese continental coast

description: This work provides for the first time a description of the reproductive biology of Trachurus picturatus in Portuguese continental waters (between 41º 49' and 36º 57' latitude North). Fish samples, a total of 7409 individuals, between 17.8 cm and 44.3 cm total length, were obtained by bottom trawlers operating on the north western coast of Portugal, between January 2010 and December 2016. The observed sex ratio (♂/♀) was 0.56. Gonads were observed macroscopically and the monthly variations in gonadosomatic index, proportion of actively spawning individuals, hepatosomatic index and Fulton’s condition factor were analysed. Lengths at first maturity couldn’t be determined due to the lack of small fish. Our results seem to indicate that the main spawning season of T. picturatus starts in December and extends until April-May, with a peak in March.
DOI: 10.17882/60629
title: Longitudinal distribution of salinity, temperature, turbidity and dissolved oxygen of surface waters in the Loire and Gironde estuaries

description: Key physico-chemical parameters (salinity, temperature, turbidity and dissolved oxygen) were measured in surface water during longitudinal transects in the Loire and Gironde estuaries in summers 2017 and 2018. This objective of this work was to determine the distribution of the dissolved oxygen and to detect potential severe desoxygenation. The transects were scheduled in order to begin the measurements at high tide from a site located upstream of an area where severe deoxygenation have been already been reported. Then, the transect was realised by sailing at low speed downstream with a multiparameter probe SAMBAT, maintained at 0.5 m below the surface, that collected a measurement every 2 minutes.
DOI: 10.17882/60422
title: Mineralogical and Nd-Sr isotopic data from the Red Sea and the Gulf of Aden sediments

description: Cores MD92-1002 and MD92-1008 were retrieved during the MD73 REDSED campaign of R/V Marion Dufresne in 1992 and are located in the western Gulf of Aden and southern Red Sea, respectively. The aim was originally to identify sediment sources thanks to the use of radiogenic isotopes. The sedimentary record in both cores presented large magnetic susceptibility peaks, which had been measured by Bouilloux et al. (2013), and these variations could have been caused either by source changes or by postdepositional processes. Nd and Sr isotopes vary depending upon rock types, and magnetic measurements can reflect lithological variations. Therefore the relationship between these parameters, can allow us to discriminate between source-driven changes and diagenetic processes that could induce variations in the magnetic signal. The studied basins are situated in a region influenced by the Asian and African monsoons, which had temporal variations. It is also one of the major regions of dust deposition, being near the Saharan and the Arabian deserts. Source determination of sediments in the basins can help us understand modern and past atmospheric pathways and relate them to climate variations. Using sediment cores that cover at least 20 ka enables the study of the last climatic cycle, i.e. the Last Glacial Maximum (LGM), the deglaciation and the present interglacial period. To further constrain the type of sources of the sediments being carried to the Red Sea and Gulf of Aden basins we also performed DRX analyses to measure the relative proportions of minerals in the bulk fraction and in the clay fraction. The clay fraction is a minor part in these sediments, however clay minerals are derived from weathering of the continents and they allow us to understand past environmental conditions. The combination of all these different tracers can help us decipher the mechanisms of sediment transport and link them to environmental variations during the Quaternary. X-ray diffraction (XRD) analyses were performed using a PANalytical X'Pert Pro Diffractometer (GEOPS Laboratory, Université Paris-Sud). Errors in mineral percentages were estimated to be around 1-2%. Sr and Nd isotope analyses were carried out on 22 carbonate-free samples from each core at a sampling resolution of around 40 cm. Nd and Sr isotopic compositions were analyzed using a Thermo Finnigan Neptune Multiple Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) at the GEE Laboratory, IPGP (Paris, France). The results are published in Rojas et al. (2019) https://doi.org/10.1016/j.quascirev.2019.02.033.
DOI: 10.17882/60223
title: Data used to assess historical changes (1905-present) in catch size and composition reflecting altering fisheries practices on a small Caribbean island

description: Effective assessments of the status of Caribbean fish communities require historical baselines to adequately understand how much fish communities have changed through time. To identify such changes and their causes, we compiled a historical overview using data collected at the beginning (1905-1908), middle (1958-1965) and end (1984-2016) of the 20th century, of the artisanal fishing practices and their effects on fish populations around Curaçao, a small island in the southern Caribbean. We documented historical trends in total catch, species composition, and catch sizes per fisher per month for different types of fisheries and related these to technological and environmental changes affecting the island’s fisheries and fish communities. We found that since 1905, fishers targeted species increasingly farther from shore after species occurring closer to shore had become rare. This resulted in surprisingly similar catches in terms of weight, but not composition. Large predatory reef fishes living close to shore (e.g., large Epinephelid species) had virtually disappeared from catches around the mid-20th century, questioning the use of data from this period as baseline data for modern day fish assessments. Secondly, we compared fish landings to in-situ counts from 1969 to estimate the relative contributions of habitat destruction and overfishing to the changes in fish abundance around Curaçao. The decline in coral dominated reef communities corresponded to a concurrent decrease in the abundance and diversity of smaller reef fish species not targeted by fishers, suggesting habitat loss, in addition to fishing, caused the observed declines in reef fish abundance around Curaçao.
DOI: 10.17882/59809
title: Biotic data collected during identification trawls on the PELGAS integrated survey in the Bay of Biscay

description: The Pélagiques Gascogne (PELGAS, Doray et al., 2000) integrated survey aims at assessing the biomass of small pelagic fish and monitoring and studying the dynamics and diversity of the Bay of Biscay pelagic ecosystem in springtime. PELGAS has been conducted within the EU Common Fisheries Policy Data Collection Framework and Ifremer’s Fisheries Information System. Details on survey protocols and data processing methodologies can be found in Doray et al., (2014, 2018). This dataset comprises the abundance (no. of individuals), biomass (metric tons), mean length (cm), mean weight (g) of marine organisms collected by midwater trawling to identify fish echoes detected during PELGAS surveys (2000-2018). All parameters have been raised to the trawl haul level. Trawl haul metadata and species reference list are also provided.
DOI: 10.17882/59777
title: ICHNUSSA 2015

description: The sampling plan of the ICHNUSSA2015 proposes the route already covered in previous cruises since 2000 to acquire data for the activities of Cal/Val of oceanographic ecosystem or for the validation of forecasting numerical models at different spatial scales. Then the aim is also to study the inter-annual variability of biogeochemical and physical properties of the water masses in crucial areas for understanding the circulation and exchange between basins, in particular the transport of heat and salt in the western Mediterranean. In particular, we want to study the exchange between western and eastern Mediterranean and the waters recirculating or formed in the Algerian-Provençal basin (like the new deep water in the Gulf of Lions) and along the transect Sardinia-Balearic islands. Then we want to monitor characteristics and distribution of the new western Mediterranean deep water and its possible effects on the general circulation of the Mediterranean. The ICHNUSSA2015 is designed to approximately replicate the stations of previous cruises like those named medgoos, MedCO or MedOc and the most recent ICHNUSSA2012 and 2013. CTD Casts At every station, pressure (P), salinity (S), potential temperature (θ) dissolved oxygen concentration (DO) and Fluorescence were measured with a CTD-rosette system consisting of a CTD SBE 911 plus, and a General Oceanics rosette with 24 Niskin Bottles (12 liters each). Temperature measurements were performed with a SBE-3/F thermometer, with a resolution of 0.00015 °C/bit at -1 °C or 0.00018°C/bit at 31 °C, and conductivity measurements were performed with a SBE-4C sensor, with a resolution of 3 x 10-4 S/m. Dissolved oxygen was measured with a SBE-43 sensor (resolution 4.3μM). The vertical profiles of all parameters were obtained by sampling the signals at 24 Hz, with the CTD/rosette going down at a speed of 1 m/s. The data were processed on board, and the coarse errors were corrected thanks to the sampling and analyzing on board o f oxygen and salinity of the deepest station. The rosette is equipped with a sonar altimeter which intercept the bottom 70-50 meters before getting to it. The altimeter is used just for safety, to avoid the rosette to touch the bottom, and for more precision in measuring depth. Oxygen and Salinity Determination Salinity samples were collected, stored and analyzed with a Guildline Portasal Salinometer, standardized with IPSO standard 34.999 PSu Water and at controlled temperature. Also dissolved oxygen samples were collected and analyzed with the Winkler method,using a computer controlled potentiometric end-point titration procedure. Samples were taken from the Niskins bottle with the recommendedprecautions and following the Winkler procedure. The dataset is provided as an ODV txt file and has been processed in accordance to the SeaDataNet's Data QC rules; for each station (66 station) the file contains the following parameters: DEPTH, PRESS, TEMP, PSAL, DOXY and FLUOZZ.
DOI: 10.17882/59768
title: OCARINA (Ocean coupled to the atmosphere: instrumented research on an auxiliary ship)

description: Remote-controlled trimaran Ocarina (Océan couplé à l'atmosphère : recherche instrumentée sur navire annexe / Ocean coupled to the atmosphere: instrumented research on an auxiliary ship). The OCARINA platform (Ocean Coupled to the Atmosphere, Research on the Interface on the Annex Ship) is a surface naval drone specifically developed to measure turbulent and radiative exchanges at the ocean/atmosphere interface. Designed and produced at LATMOS in 2009, the initial version of OCARINA has evolved through campaigns and collaborations with DT-INSU, ENSTA-Paris, Ifremer, LOCEAN, and IRPHE. The onboard instruments are an inertial unit, a GPS, a sonic anemometer, a probe for measuring rising and falling radiative flows in the infrared and in visible wavelengths, a submerged probe of the CT type, and a meteorological station. The level 2 data provided are: - the location, speed, heading and route followed - the height and significant period of waves longer than two meters - the water temperature (SST) at a depth of 30 cm - surface salinity (SSS) - the meteorological variables (wind in modulus and direction, temperature, humidity and pressure) at one meter high. - solar and infrared fluxes up and down - turbulent bulk flows (u*, Hs and LE), and Monin-Obukhov's ratio (z/L) - u* and Hsv (the turbulent buoyancy flux) estimated by the inertio dissipative method - u* and Hsv estimated by covariance method