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Comparison of trophic spectrum in the blackspot seabream, Pagellus bogaraveo (Brünnich, 1768), between cold-water coral habitats and muddy bottoms in the central Mediterranean. Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2021-01-15 Francesca Capezzuto; Francesco Ancona; Crescenza Calculli; Roberto Carlucci; Letizia Sion; Porzia Maiorano; Gianfranco D'Onghia
The present study represents the first documentation of the trophic spectrum of the deep-water bony fish Pagellus bogaraveo in two different habitats in the central Mediterranean Sea: muddy bottoms (MB) and cold-water coral (CWC) habitats. A total of 133 stomachs were collected on MB and 39 in CWC habitats. The feeding habit of P. bogaraveo was different in the two investigated habitats. A lower number
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Synaphobranchid eel swarms on abyssal seamounts: Largest aggregation of fishes ever observed at abyssal depths Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-17 Astrid B. Leitner; Jennifer M. Durden; Craig R. Smith; Eric D. Klingberg; Jeffrey C. Drazen
The abyssal seafloor makes up three quarters of the ocean floor, and it is generally characterized as a food-limited habitat with low numbers of megafauna, particularly fishes. Baited camera observations from three abyssal seamount summits in the equatorial Pacific challenge this idea. On each of two deployments at the southernmost seamount, over 100 synaphobranchid eels (Ilyophis arx) were recorded
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Salinity bias with negative pressure dependency caused by anisotropic deformation of CTD measuring cell under pressure examined with a dual-cylinder cell model Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-05 Taiyo Kobayashi
Measurements made by deep floats had a salinity bias with a negative pressure dependency. Salinity is affected by conductivity measurements via changes in the CTD measuring cell geometry under pressure. To remove the effect, a canceling factor for pressure CPcor is prepared theoretically by the manufacturer considering the isotropic deformation of a single-cylinder measuring cell under pressure; the
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Spatial distribution and habitat characterization of marine animal forest assemblages along nine submarine canyons of Eastern Sardinia (central Mediterranean Sea) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-04 Davide Moccia; Alessandro Cau; Lorenzo Bramanti; Laura Carugati; Simonepietro Canese; Maria Cristina Follesa; Rita Cannas
Submarine canyons are peculiar habitats of the continental margin due to their hydrodynamic and geomorphological features. Coral assemblages forming marine animal forests (MAFs) are one of the key benthic components dwelling in these habitats, where they enhance the substrate's heterogeneity and provide shelter, feeding and spawning habitats for a wide variety of species. They are also considered Vulnerable
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Hydrodynamics of the choke point between Cape Town and Antarctica during the austral summer of 2019 Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-12 Alvarinho J. Luis; Kiledar S. Tomar; Ashutosh Prasad
This study addresses the hydrodynamics inferred from the expendable conductivity-temperature-depth (XCTD) observations carried out in the southwestern Indian Ocean sector of the Southern Ocean along two transects: the Lazarev Sea to Cape Town (track-1) and Cape Town to Prydz bay (track-2) during the austral summer of 2019. The vertical temperature and salinity structures revealed an eddy extending
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Abundance of low-temperature axial venting at the equatorial East Pacific Rise Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-07 Sheng Chen; Chunhui Tao; Christopher R. German
Since their first discovery, predictions of the incidence of high temperature submarine vents has been made from along-axis surveys for the presence or absence of particle-rich “black smoker” hydrothermal plumes in the overlying water column. Recent work along intermediate and fast spreading ridges, however, has shown that abundant lower-temperature forms of seafloor fluid flow might be overlooked
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Contourite processes associated with the overflow of Pacific Deep Water within the Luzon Trough: Conceptual and regional implications Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2021-01-08 Shaoru Yin; F. Javier Hernández-Molina; Richard Hobbs; Jinyao Gao; Weifeng Ding; Chunguo Yang; Lin Lin; Huodai Zhang; Ziyin Wu; Jiabiao Li
Overflows through oceanic gateways govern the exchange of water masses in the world's ocean basins. These exchanges also involve energy, salinity, nutrients, and carbon. As such, the physical features that control overflow can exert a strong influence on regional and global climate. Here, we present the first description of sedimentary processes generated by the overflow of Pacific Deep Water (OPDW)
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Interdecadal variability of the Western Subarctic Gyre in the North Pacific Ocean Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2021-01-05 Hiroshi Kuroda; Satoshi Suyama; Hiroomi Miyamoto; Takashi Setou; Takuya Nakanowatari
Interdecadal variations of the Western Subarctic Gyre (WSAG) in the North Pacific were examined mainly by analysis of absolute dynamic topography (ADT) during 1993–2017 that was based on altimetry-derived sea level anomalies superimposed on state-of-the-art mean dynamic topography. We specified geostrophic surface streamlines of the WSAG associated with closed isolines of the ADT. The WSAG intensity
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Variability of phytoplankton light absorption in stratified waters of the NW Mediterranean Sea: The interplay between pigment composition and the packaging effect Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-29 Gonzalo L. Pérez; Martí Galí; Sarah-Jeanne Royer; Marina Gerea; Eva Ortega-Retuerta; Josep M. Gasol; Cèlia Marrasé; Rafel Simó
The Variability of chlorophyll-specific phytoplankton light absorption [a*ph (λ)] was examined over depth and time in stratified offshore waters of the North-Western Mediterranean Sea. Coherent water patches were tracked with Lagrangian drifters during two oceanographic cruises in September (late summer) and May (post-spring bloom phase). By simultaneously analysing the phytoplankton absorption and
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Deep-sea habitat characterization using acoustic data and underwater imagery in Gazul mud volcano (Gulf of Cádiz, NE Atlantic) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-14 Javier Urra; Desirée Palomino; Pablo Lozano; Emilio González-García; Carlos Farias; Ángel Mateo-Ramírez; Luis Miguel Fernández-Salas; Nieves López-González; Yolanda Vila; Covadonga Orejas; Patricia Puerta; Jesús Rivera; Lea-Anne Henry; José L. Rueda
Gazul is the shallowest mud volcano (MV) within the Shallow Field of Fluid Expulsion (SFFE) of the northeastern Gulf of Cádiz (NE Atlantic; 300–1200 m depth). The SFFE represents an important geo- and biodiversity area that was designated as a Site of Community Importance under the European Habitats Directive in 2014. In this study, geological features, habitats and associated biodiversity, as well
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Community structure and productivity of Arctic benthic fauna across depth gradients during springtime Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-13 Barbara Oleszczuk; Katarzyna Grzelak; Monika Kędra
Knowledge regarding the benthic community structure (macro- and meiofauna) and its production is crucial for understanding the consequences of ongoing climate change, yet it is still limited, particularly concerning springtime. This is the first study to provide information on the community characteristics and secondary production of macro- and meiofauna collected in the European sector of the Arctic
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Diatom and coccolithophore species fluxes in the Subtropical Frontal Zone, east of New Zealand Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-13 Jessica V. Wilks; Scott D. Nodder; Andrés Rigual-Hernández
The Chatham Rise supports some of New Zealand's most economically valuable commercial fish stocks, fuelled by the highly productive waters of the Subtropical Frontal Zone (STFZ). Climate change-related shifts in phytoplankton community structure and function are predicted and may affect Chatham Rise productivity and deep-sea carbon sequestration by the biological carbon pump. However, little is known
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Sedimentary characteristics and genetic mechanism of a deep-water channel system in the Zhujiang Formation of Baiyun Sag, Pearl River Mouth Basin Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-07 Ye Yu; Changmin Zhang; Li Wang; Shaohua Li; Andrew Hursthouse; Yanran Huang; Taotao Cao
The external geometry, internal architecture and sedimentary evolution processes of the deep-water channel system in Zhujiang Formation in the Midwest of Baiyun Sag have been revealed in detail according to the integrated analysis of 3D seismic data and a large number of drilling and logging data sets. In addition, the controlling effect of sediment supply, sea level change, shelf break zone and palaeogeomorphology
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Contribution rates of different spawning and feeding grounds to adult Pacific bluefin tuna (Thunnus orientalis) in the northwestern Pacific Ocean Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-05 Jen-Chieh Shiao; Jhen Hsu; Ching-Chun Cheng; Wen-Yu Tsai; Han-Bo Lu; Yosuke Tanaka; Pei-Lin Wang
Pacific bluefin tuna (Thunnus orientalis, PBF) is an economically important species, however, the population size has decreased for decades due to overexploitation. PBF has multiple spawning grounds and shows trans-Pacific migration for forage and reproduction. Therefore, a comprehensive understanding of the population connectivity and mixing rates among feeding and spawning grounds are required for
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Population structure, vertical distribution and fecundity of Eukrohnia hamata (Chaetognatha) in the Arctic Ocean during summer Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-12-03 K.N. Kosobokova; R.R. Hopcroft
The population size structure, vertical distribution, gonad maturation, individual fecundity and embryonic development of the chaetognath Eukrohnia hamata were studied in the northernmost part of its distribution area, the Arctic Ocean. Analysis was based on stratified zooplankton samples collected in the Canada Basin during July 2005 that covered the depth range from the surface down to the bottom
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Characterizing geochemistry of organic carbon, sulfur, and iron in sediments of the middle Okinawa Trough since the last glacial maximum Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-26 Kui Ma; Zhi-Lei Sun; Mao-Xu Zhu; Xian-Rong Zhang; Kui-Ying Ding; Tie Li; Xi-Lin Zhang; Bin Zhai; Hong Cao; Geng Wei; Cui-Ling Xu
The diagenetic interplays of organic carbon (OC), sulfur (S), and iron (Fe) in marine sediments and their responses to changes in depositional and climatic conditions are poorly characterized. In this study, chemical speciation and isotopes were combined to characterize diagenesis of OC, S and Fe in sediments of the middle Okinawa Trough (OT), a back-arc deep basin along the edge of the East China
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Latitudinal distribution of the picoplankton community in the eastern equatorial Indian Ocean during the boreal fall intermonsoon period Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-25 Chao Yuan; Xuelei Zhang; Zongling Wang; Yan Li; Zongjun Xu; Qinsheng Wei; Lin Liu
A flow cytometric analysis of picoplankton (Prochlorococcus (Pro), Synechococcus (Syn), picoeukaryotes (Peuk) and heterotrophic bacteria (Hbac) was performed along a meridional transect (88°E, 10°S – 4°N) in the eastern equatorial Indian Ocean (EEIO) during the boreal fall intermonsoon period. The transect spanned contrasting physical and chemical conditions, allowing investigation of the effects of
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A local scale analysis of manganese nodules influence on the Clarion-Clipperton Fracture Zone macrobenthos Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-21 Pasotti Francesca; Lisa Mevenkamp; Ellen Pape; Magdalena Błażewicz; Paulo Bonifácio; Torben Riehl; Bart De Smet; Nene Lefaible; Lidia Lins; Ann Vanreusel
The present investigation focuses on the Global Sea Mineral Resources contract area B4S03 site in the Clarion-Clipperton Fracture Zone nodule fields. We investigated the sedimentary characteristics and the higher-taxon (order/class) and lower-taxon (family, morphospecies) diversity of the soft sediment macrobenthos with special focus on the dominant taxa (Isopoda, Polychaeta, Tanaidacea) in relation
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Source waters contribution to the tropical Atlantic central layer: New insights on the Indo-Atlantic exchanges Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-20 Elias Azar; Andres Piñango; Mônica Wallner-Kersanach; Rodrigo Kerr
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Molecular phylogenetic and morphological analyses of the ‘monospecific’ Hesiolyra (Annelida: Hesionidae) reveal two new species Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-19 Zhi Wang; Ting Xu; Yanjie Zhang; Yadong Zhou; Zhensheng Liu; Chong Chen; Hiromi Kayama Watanabe; Jian-Wen Qiu
Although many deep-sea species are considered to have transoceanic distribution, this assumption has rarely been critically tested. Using Hesiolyra (Hesionidae) as a case study, we show that careful molecular and morphological analyses are required for refuting/accepting claims about such wide distribution. Hesiolyra is a genus of polychaetes commonly found in hydrothermal vents of the Eastern Pacific
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The demersal bathyal fish assemblage of the Central-Western Mediterranean: Depth distribution, sexual maturation and reproduction Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-11 Cristina Porcu; Martina Francesca Marongiu; Antonio Olita; Andrea Bellodi; Rita Cannas; Pierluigi Carbonara; Alessandro Cau; Antonello Mulas; Paola Pesci; Maria Cristina Follesa
This study compiles information on the size distribution and reproductive patterns of five chondrichthyans and 10 bony species dwelling on the continental slope of the Central-Western Mediterranean (south-eastern Sardinian waters, depth 720–1890 m). The abundance of the relatively less numerous chondrichthyans was found to decrease with depth. Almost all chondrichthyan species had a long reproductive
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Prevalence of temperate viruses in deep South China Sea and western Pacific Ocean Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-28 Min Jin; Lanlan Cai; Ruijie Ma; Runying Zeng; Nianzhi Jiao; Rui Zhang
The deep ocean, one of the largest biomes on Earth, supports diverse microbial communities, which play important roles in biogeochemical cycles. However, despite their importance, viruses in the deep ocean remain largely unknown. In this study, we performed metagenomics to investigate viral communities from deep sea waters in the South China Sea (SCS) and western Pacific Ocean (WPO). Deep-sea viral
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Feeding ecology of blue whiting (Micromesistius poutassou) in the NW Mediterranean: The important role of Myctophidae Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-26 Joan Mir-Arguimbau; Joan Navarro; Marc Balcells; Paloma Martín; Ana Sabatés
We investigated the feeding ecology of blue whiting (Micromesistius poutassou) in the NW Mediterranean living in two habitats, the shelf break and the continental slope, throughout the year, by combining two methodological approaches, stomach content characterization and stable isotope analyses. Stomach content indicated that blue whiting mainly fed on Myctophidae fish, decapods and euphausids. Differences
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Observations of sperm storage in some deep-sea elasmobranchs Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-06 Adèle Dutilloy; Matt R. Dunn
The presence of sperm storage was evaluated in several deep-sea elasmobranchs (Centrophorus squamosus, Centroselachus crepidater, Deania calcea, Brochiraja spinifera, Brochiraja asperula, Apristurus ampliceps, A. exsanguis, A. garricki and A. sinensis), all considered at risk to the impacts of fishing in New Zealand. Biological measurements of reproductive organs (e.g. follicle size and number, oviducal
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Response of petroleum seep mussels to changing environmental conditions: Parasite transmission, infection intensification, and health Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-06 Eric N. Powell; Kathryn A. Ashton-Alcox
Trematode sporocyst and rickettsia weighted prevalences were found to be extremely high in Gulf of Mexico petroleum seep mussels, Bathymodiolus childressi, in comparison to shallow-water mytilids. Understanding the role that parasites might play in mussel population dynamics and health requires an understanding of the rapidity with which parasite infections and physiological condition respond to changes
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Exploring a deep-sea vulnerable marine ecosystem: Isidella elongata (Esper, 1788) species assemblages in the Western and Central Mediterranean Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-10 Pierluigi Carbonara; Walter Zupa; Maria Cristina Follesa; Alessandro Cau; Francesca Capezzuto; Giovanni Chimienti; Gianfranco D'Onghia; Giuseppe Lembo; Paola Pesci; Cristina Porcu; Isabella Bitetto; Maria Teresa Spedicato; Porzia Maiorano
The bamboo coral Isidella elongata is a key structuring species on deep muddy bottoms, which has suffered severe consequences from bottom-fishing activities, as it often co-occurs with precious fishery resources such as red shrimps. A five-year series of data collected during a scientific trawl survey was used to localize the presence and to characterize the associated megafauna over a wide spatial
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Aspects of the summer circulation in the eastern Ligurian Sea Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-09 Roberto Iacono; Ernesto Napolitano
Water exchanges between the Tyrrhenian Sea and the Liguro-Provençal basin occur through the Corsica Channel, a narrow passage between Corsica and the Elba Island, near the Italian coast. It has long been known that the Channel hosts a robust Tyrrhenian outflow in winter, which penetrates far into the Ligurian Sea, reaching the site where deep-water formation takes place. The summer circulation in the
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Surface connection between the Ionian Sea and different areas of the Mediterranean derived from drifter data Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-28 Paolo Celentano; Pierpaolo Falco; Enrico Zambianchi
The surface connection between the Ionian Sea (central Mediterranean Sea) and the surrounding areas is studied by looking at the statistical properties of 1632 near-surface Lagrangian trajectories. The choice of the area is due to the key role in the dynamics of the Mediterranean Sea and to the geographical distribution of data. The Lagrangian drifter data were taken from the OGS Mediterranean drifter
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Winter biogenic silica and diatom distributions in the Indian sector of the Southern Ocean Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-27 Ian Weir; Sarah Fawcett; Shantelle Smith; David Walker; Thomas Bornman; Susanne Fietz
Spring and summer Southern Ocean phytoplankton communities have been well characterized, but winter communities are often overlooked. Diatoms are a major contributor to Southern Ocean particulate organic carbon (POC) production and export, and exert a strong control on Antarctic surface and Subantarctic thermocline nutrient concentrations, thus influencing the low-latitude nutrient supply. Understanding
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Release of significant fraction of primary production as dissolved organic carbon in the Bay of Bengal Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-16 D.N. Rao; M. Chopra; G.R. Rajula; D.S.L. Durgadevi; V.V.S.S. Sarma
Despite nutrients supply through river discharge, atmospheric deposition and eddy-driven mixing, low primary production in the Bay of Bengal (BoB) is attributed to light limitation and non-availability of nutrients during summer monsoon. We report here the first ever measurements of release of significant fraction of primary production as dissolved organic carbon (DOC) in the BoB through isotopic tracer
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Latitudinal transition of mesopelagic larval fish assemblages in the eastern central Atlantic Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-15 Shawn Dove; Maik Tiedemann; Heino Ove Fock
This study presents a broad-scale view of larval fish species distributions in the eastern Central and North Atlantic and places it in a hydrographic context. Pelagic fish larvae, including metamorphic stages, were sampled to 1000 m depth across a 46° latitudinal transect from the equator to the Bay of Biscay. By analysing species composition and relating it to hydrographic parameters, we were able
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Two new species of Rosalinda (Cnidaria, Hydrozoa, Anthoathecata) from West African cold-water coral mounds Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-12 Marta Gil; André Freiwald; Fran Ramil
In this paper, two new species of the genus Rosalinda found growing on bivalves from West African cold-water coral mounds are described. Rosalinda nowaldi sp. nov. was found on Acesta angolensis (Adam & Knudsen, 1955) off northern Angola, and Rosalinda lundalvi sp. nov. on Acesta excavata (Fabricius, 1779) off Mauritania. Both new species have a similar cnidome, but they can be easily differentiated
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Biological condition and population structure of benthopelagic shrimps in the Galicia Bank (NE Atlantic): Intra- and interspecific patterns Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-11 J.E. Cartes; R. Rodríguez-Ribas; V. Papiol; X. Valeiras; A. Punzón; M. Blanco; A. Serrano
Few studies examined species or ecosystem dynamics on seamounts/banks. The Galicia Bank (GB), the deepest marine Special Area of Conservation in the Spanish Natura 2000 network, is considered a conservation priority because of its highly vulnerable habitats, such as cold-water and bamboo corals. The biological conditions and population structure of benthopelagic shrimps and their relationship with
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Community structure of deep fjord and shelf benthic fauna receiving different detrital kelp inputs in northern Norway Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-05 Eva Ramirez-Llodra; Torstein Pedersen; Karen Filbee Dexter; Freija Hauquier; Katja Guilini; Nina Mikkelsen; Gunhild Borgersen; Margo Van Gyseghem; Ann Vanreusel; Daniel Vilas
Kelp forest produce large amounts of macroalgal detritus, ranging from whole plants to small particles (1 mm). The role of this kelp detritus in fueling deep-sea communities adjacent to healthy kelp forests was investigated in a region in the North of Norway by comparing the community structure and biodiversity of meio-, macro-, and megafauna in two deep (450 m) areas with different expected input
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A novel fish sampling system for ROVs Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-02 Nicholas Chaloux; Brennan T. Phillips; David F. Gruber; Robert C. Schelly; John S. Sparks
Mesophotic coral reefs (~30–150 m) and deeper reefs (>150 m) represent some of the least explored and poorly documented habitats in our oceans. These deep ecosystems are both high in biodiversity and ecologically distinct from shallower reefs. They are also equally threatened by natural and anthropogenic factors. Thanks to advancements in remote undersea technologies, our access to and understanding
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A threefold perspective on the role of a pockmark in benthic faunal communities and biodiversity patterns Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-02 Nuria Sánchez; Daniela Zeppilli; Elisa Baldrighi; Ann Vanreusel; Max Gasimandova Lahitsiresy; Christophe Brandily; Lucie Pastor; Lara Macheriotou; Guillermo García-Gómez; Stéphanie Dupré; Karine Olu
Pockmarks are circular-shaped depressions that increase seabed heterogeneity and are characterized by discontinuous fluid emissions. To understand how environmental conditions of pockmarks affect the structure of macro- and meiofauna, we investigated two sites in a pockmark field in the northwestern Madagascar margin. In a comparative approach, we explored the community structure of the dominant taxa
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Population connectivity of fan-shaped sponge holobionts in the deep Cantabrian Sea Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-11-01 Kathrin Busch; Sergi Taboada; Ana Riesgo; Vasiliki Koutsouveli; Pilar Ríos; Javier Cristobo; Andre Franke; Klaus Getzlaff; Christina Schmidt; Arne Biastoch; Ute Hentschel
Connectivity is a fundamental process driving the persistence of marine populations and their adaptation potential in response to environmental change. In this study, we analysed the population genetics of two morphologically highly similar deep-sea sponge clades (Phakellia hirondellei and the ‘Topsentia-and-Petromica’ clade, (hereafter referred to as ‘TaP clade’)) at three locations in the Cantabrian
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Optimizing a standard preparation procedure for grain size analysis of marine sediments by laser diffraction (MS-PT4SD: Marine sediments-pretreatment for size distribution) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-29 Roy Jaijel; Beverly N. Goodman Tchernov; Eli Biton; Yishai Weinstein; Timor Katz
Grain size distributions are a key physical measurement in marine sediment studies. The introduction of laser diffraction spectrometry analyzers a few decades ago, allowed the differentiating of grain size in higher resolution than before, and led to increased volumes of samples analyzed overall. However, pretreatment of the sediment samples is required for obtaining high quality results by this method
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Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-29 Simone Sauer; Wei-Li Hong; Haoyi Yao; Aivo Lepland; Martin Klug; Florian Eichinger; Tobias Himmler; Antoine Crémière; Giuliana Panieri; Carsten J. Schubert; Jochen Knies
We investigate the uppermost 60 cm of sediment in active pockmarks of a deep-water methane seep site from Vestnesa Ridge offshore NW Svalbard. Using video guided core sampling with a remotely operated vehicle we collected push cores directly from bacterial mats within two active pockmarks, Lunde and Lomvi. Pore water analyses show very shallow sulphate methane transition zones and transport-reaction
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Sub-surface current meanders along the Namibian shelf Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-10-28 Eberhard Hagen; Rainer Feistel
The influence of long, sub-inertial waves travelling poleward on spatiotemporal fluctuations in the hydrography of coastal upwelling areas has widely been discussed theoretically in the literature since the late 1970s. In this paper, in contrast, measured unexpected wave-like changes in the intermediate density field along the Namibian continental slope are presented and suggested to be the result
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Challenger Deep internal wave turbulence events Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-13 Hans van Haren
Marine life has been detected in the ocean's trenches at great depths, down to nearly 11 km. Such life is subject to particular environmental conditions of large static pressure exceeding 1000 atm. While current flows are expected to be slow, waters cannot be stagnant with a limited exchange of fresh nutrients needed to support life. For sufficient nutrient supply, the physical process of turbulent
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Megabenthic assemblages in the lower bathyal (700–3000 m) on the New England and Corner Rise Seamounts, Northwest Atlantic Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-29 Abby E. Lapointe; Les Watling; Scott C. France; Peter J. Auster
Using a combination of data obtained from high-definition still images, video, and specimens collected during human-occupied submersible and remotely-operated vehicle dives spanning the period 2003 to 2014, we provide the first detailed characterization of the megabenthic assemblages in the lower bathyal on the New England and Corner Rise Seamounts in the Northwest Atlantic. Over all, the New England
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Bathy- and mesopelagic annelida from the Arctic Ocean: Description of new, redescription of known and notes on some “cosmopolitan” species Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-12 Glafira Kolbasova; Ksenia Kosobokova; Tatiana Neretina
Pelagic polychaetes collected in the deep Arctic Ocean between 2011 and 2016 during three expeditions of R/V Polarstern were investigated using morphological taxonomic and molecular methods based on DNA sequences for portions of the mitochondrial 16S and nuclear 18S and 28S rDNA genes. A comparison of our results on arctic Pelagobia cf. longicirrata Greeff, 1879, (Lopadorrhynchidae) and Typhloscolex
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Diversity and composition of benthic asellote Isopoda from two different New Zealand continental margin habitats - implications of habitat heterogeneity, productivity and depth Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-30 Stefanie Kaiser; Lidia Lins; Marina Malyutina; Sadie Mills; Anne-Nina Lörz
As part of the New Zealand government Ocean Survey 20/20 programme (OS 20/20, 2006–2013), samples from the Chatham Rise and Challenger Plateau collected in 2007 were analysed to determine the effects of key environmental parameters, in particular sediment and water mass properties, on spatial changes in the community structure (abundance, diversity and community composition) of bathyal asellotan isopods
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Phytodetritus, chemosynthesis, and the dark biosphere: Does depth influence trophic relationships at deep-sea Barbados seeps Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-29 Trevyn A. Toone; Travis W. Washburn
This study explores the role of photosynthetically-derived carbon in seep communities at shallower, bathyal seeps and at deeper, abyssal seeps on the Barbados accretionary prism. Carbon sources and feeding guilds were assessed from five Barbados seeps and three putative non-seep sites through carbon and nitrogen stable isotope analyses on numerically-dominant and/or high-biomass species. Thiotrophy
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Evidences of human impact on megabenthic assemblages of bathyal sediments in the Alboran Sea (western Mediterranean) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-30 Jordi Grinyó; Claudio Lo Iacono; Martina Pierdomenico; Suzanne Conlon; Guillem Corbera; Eulàlia Gràcia
Megabenthic assemblages in deep-sea sedimentary environments receive far less attention than those occurring on rocky environments, despite they have been widely impacted by destructive trawling activities, mainly due to their association with important commercial species. ROV dives conducted on bathyal muds of the Alboran Sea continental slope (western Mediterranean) were used to characterize megabenthic
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Beluga dive behavior relative to fronts and stratified layers near Barrow Canyon, Alaska Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-12 J.J. Citta; S.R. Okkonen; R.S. Suydam; L. Quakenbush; A.L. Bryan; J. Olnes
We report on the first beluga whale (Delphinapterus leucas), an adult female, from the Eastern Chukchi Sea (ECS) stock to be tagged with a Satellite Relay Data Logger (SRDL) that included a miniaturized Conductivity, Temperature, and Depth (CTD) sensor capable of collecting temperature (T) and salinity (S) profiles as the beluga dove. Prior work speculated that ECS belugas may target fronts and stratified
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Metagenomic studies of SAR202 bacteria at the full-ocean depth in the Mariana Trench Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-12 Zhan-Fei Wei; Wen-Li Li; Jiao-Mei Huang; Yong Wang
SAR202 in Chloroflexi phylum plays an important role in degradation of organic compounds in the oligotrophic deep ocean. Due to lack of high-quality genomes from across all depths of the water column, the metabolic capacities of the SAR202 subclusters in the marine environment were still largely unknown. In this study, we discovered the dynamics of the SAR202 subclusters in vertical layers of global
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Habitat, morphology and trophism of Tritonia callogorgiae sp. nov., a large nudibranch inhabiting Callogorgia verticillata forests in the Mediterranean Sea Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-03 Giovanni Chimienti; Lorenzo Angeletti; Giulia Furfaro; Simonepietro Canese; Marco Taviani
The continuing exploration of the Mediterranean deep sea reveals that a complete census of the biodiversity of one of the most studied marine areas in the world is yet to be fully accomplished. A tritoniid nudibranch new to science is described upon material recovered off the Montenegro margin, Adriatic Sea, associated with the alcyonacean Primnoidae Callogorgia verticillata (Pallas, 1766). Here, a
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Contrast across a boundary: Differing histories of two eelpout populations on a continuous continental slope Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-14 Kay Sakuma; Yuji Ueda; Kunihiro Fujiwara; Taketoshi Kodama; Hiroaki Kurihara; Gento Shinohara; Shigeaki Kojima
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Diversity and connectivity of microeukaryote communities across multiple habitats from intertidal zone to deep-sea floor in the Western Pacific Ocean Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-12 Feng Zhao; Chunsheng Wang; Kuidong Xu; Pingping Huang; Tong Zhou
Habitat differentiation is the essential force for shaping animal and plant biogeography. Distribution patterns of microeukaryotes, which are an assemblage of highly diverse and phylogenetically distant groups, across multiple marine habitats remain largely unknown. We hypothesize that microeukaryote communities vary across different types of marine habitats at the regional scale similar as macroorganisms
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Potential mechanisms responsible for occurrence of core oxygen minimum zone in the north-eastern Arabian Sea Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-11 V.V.S.S. Sarma; T.V.S. Udaya Bhaskar; J. Pavan Kumar; Kunal Chakraborty
The thickness of oxygen minimum zone (OMZ) is estimated for the first time using dissolved oxygen (DO) profiles obtained from the Biogeochemical Argo floats collected between 2013 and 2019 in the Arabian Sea. The depth of upper boundary of the OMZ varied narrowly between 70 and 220 m in the entire Arabian Sea whereas the lower boundary of OMZ significantly deepened from south (500 m) to northern Arabian
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Zonal and depth patterns in the trophic and community structure of hyperiid amphipods in the Southeast Pacific. Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-09-19 Liliana Espinosa-Leal; Antonio Bode; Rubén Escribano
The structure of the pelagic food web is a key issue to understand the variability in C and N fluxes in the ocean. The trophic structure of the hyperiid amphipods and its spatial variation in the subtropical area of the Southeast Pacific was studied based on C and N isotope composition. Zooplankton were collected off northern and Central-southern Chile during September-November 2016 at the coastal
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The Zapiola Anticyclone: A Lagrangian study of its kinematics in an eddy-permitting ocean model Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-07-05 Wilbert Weijer; Alice Barthel; Milena Veneziani; Hannah Steiner
The Zapiola Anticyclone (ZA) is a strong, O(100 Sv), barotropic vortex in the center of the Argentine Basin that is tied to a bathymetric feature called the Zapiola Rise. It is regionally significant for two reasons: first, the strong vortex is a dynamical barrier that inhibits the lateral exchange of water, and hence has the ability to trap water for a long period of time. Second, its dynamics is
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Trophic interactions of megafauna in the Mariana and Kermadec trenches inferred from stable isotope analysis Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-07-30 Andrew K. Tokuda; Jeffrey C. Drazen; Mackenzie E. Gerringer; Brian N. Popp; Eleanna Grammatopoulou; Daniel J. Mayor
Hadal trenches house distinct ecosystems but we know little about their sources of nutrition or trophic structures. We evaluated megafaunal food web structure and nutritional sources in the Kermadec and Mariana trenches using carbon and nitrogen stable isotope analysis (δ15N and δ13C values) of bulk tissues and proteinaceous individual amino acids (AAs). In the Kermadec Trench, bulk δ15N values ranged
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Temporal dynamics in diversity patterns of fish sound production in the Condor seamount (Azores, NE Atlantic) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-07-31 Rita Carriço; Mónica A. Silva; Gui M. Menezes; Manuel Vieira; Marta Bolgan; Paulo J. Fonseca; M. Clara P. Amorim
Fish sounds are important components of Azorean soundscapes. Therefore, unraveling their patterns can contribute to a better assessment of local biodiversity dynamics. Passive Acoustic Monitoring (PAM) is a cost-effective, non-intrusive method providing long-term information regardless of weather or logistic conditions, which can be especially useful when monitoring remote areas. Using PAM, we assess
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Size and stage-dependent vertical migration patterns in reef-associated fish larvae off the eastern coast of Australia Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-01 Steven Hawes; Tony Miskiewicz; Valquiria Garcia; Will Figueira
Larval fish have been shown to vertically migrate with ontogeny, a behaviour that influences their dispersal by exposing the larvae to currents with different velocities at different stages of development. Most studies have focused on studying the vertical migration of tropical reef fishes, that have been shown in general to migrate downwards with ontogeny. Here we investigated if similar ontogenetic
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Spanning the depths or depth-restricted: Three new species of Bathymodiolus (Bivalvia, Mytilidae) and a new record for the hydrothermal vent Bathymodiolus thermophilus at methane seeps along the Costa Rica margin Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-07-16 Marina F. McCowin; Caitlin Feehery; Greg W. Rouse
Bathymodiolus Kenk and Wilson, 1985 includes fourteen currently recognized species from deep-sea chemosynthetic environments in the Pacific, Atlantic, and Indian oceans. In this study, phylogenetic analyses of mytilid mussels sampled from seeps along the Costa Rica margin reveal the presence of three new Bathymodiolus species, sampled from depths across ~1000–1900 m. Bathymodiolus billschneideri n
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210Po and 210Pb distributions during a phytoplankton bloom in the North Atlantic: Implications for POC export Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-07-07 Evan J. Horowitz; J. Kirk Cochran; Michael P. Bacon; David J. Hirschberg
During the North Atlantic Bloom Experiment (NABE) of the Joint Global Ocean Flux Study (JGOFS), water column sampling for particulate and dissolved 210Po and 210Pb was performed four times (26 April and 4, 20, 30 May 1989) during a month-long Lagrangian time-series occupation of the NABE site, as well as one-time samplings at stations during transit to and from the site. There are few prior studies
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Trans-Pacific genetic differentiation in the deep-water stalked barnacle Scalpellum stearnsii (Cirripedia: Thoracica: Scalpellidae) Deep Sea Res. Part I Oceanogr. Res. Pap. (IF 2.606) Pub Date : 2020-08-07 Hsiu-Chin Lin; Chi-Chiu Cheang; Laure Corbari; Benny Kwok Kan Chan
Recent advancements in deep-sea expeditions have made possible to sample adequate quantities of deep-sea organisms over wide geographical ranges for population genetic studies. Scalpellum stearnsii is a common stalked barnacle that occurs in the mesobenthic environment (>200 m depth) throughout the West Pacific Ocean and covers several major deep-sea basins. The present study examined the diversity