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Registros recuperados: 7
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Akanthepsilonema oceanopolis sp. nov. (Nematoda: Epsilonematidae), a new free-living marine nematode from the Condor Seamount (North-East Atlantic Ocean) ArchiMer
Zeppilli, Daniela; Bongiorni, Lucia; Decraemer, Wilfrida; Vanreusel, Ann.
Epsilonematids are epifaunal nematodes characterized by an epsilon-shaped body and the presence of ambulatory setae, which are used in their locomotion. Nematodes belonging to this family were recently found in deep sea, especially in cold-water coral and seamount ecosystems. Akanthepsilonema oceanopolis sp. nov. (Nematoda: Epsilonematidae) is described from sediments of the Condor Seamount (North-East Atlantic Ocean) at 206 m water depth. Its main features are a heterogeneous cuticule with large horn-like dorsal spines both in anterior and in posterior regions; the presence of eight subcephalic setae arranged in two rows and the ratio maximum/minimum body diameter larger than two. The taxonomic position of this new species within the genus is discussed...
Tipo: Text Palavras-chave: Akanthepsilonema oceanopolis; Nématodes; Mont sous-marin; Epsilonematidés; Taxinomie; Akanthepsilonema oceanopolis; Nematodes; Seamount; Epsilonematids; Taxonomy.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00199/31050/29470.pdf
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Causes of earthquake spatial distribution beneath the Izu-Bonin-Mariana Arc ArchiMer
Kong, Xiangchao; Li, Sanzhong; Wang, Yongming; Suo, Yanhui; Dai, Liming; Geli, Louis; Zhang, Yong; Guo, Lingli; Wang, Pengcheng.
Statistics about the occurrence frequency of earthquakes (1973-2015) at shallow, intermediate and great depths along the Izu-Bonin-Mariana (IBM) Arc is presented and a percent perturbation relative to P-wave mean value (LLNL-G3Dv3) is adopted to show the deep structure. The correlation coefficient between the subduction rate and the frequency of shallow seismic events along the IBM is 0.605, proving that the subduction rate is an important factor for shallow seismic events. The relationship between relief amplitudes of the seafloor and earthquake occurrences implies that some seamount chains riding on the Pacific seafloor may have an effect on intermediate-depth seismic events along the IBM. A probable hypothesis is proposed that the seamounts or...
Tipo: Text Palavras-chave: Philippine Sea Plate; Pacific Plate; Earthquake; Seamount; Slab tear; Subduction rate.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00407/51828/52427.pdf
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Micronekton distributions and assemblages at two shallow seamounts of the south-western Indian Ocean: Insights from acoustics and mesopelagic trawl data ArchiMer
Annasawmy, Pavanee; Ternon, Jean-francois; Cotel, Pascal; Cherel, Yves; Romanov, Evgeny V.; Roudaut, Gildas; Lebourges-dhaussy, Anne; Ménard, Fréderic; Marsac, Francis.
Micronekton distributions and assemblages were investigated at two shallow seamounts of the south-western Indian Ocean using a combination of trawl data and multi-frequency acoustic visualisation techniques. La Pérouse (∼60 m) seamount is located on the outskirts of the oligotrophic Indian South Subtropical Gyre province with weak mesoscale activities and low primary productivity all year round. The “MAD-Ridge” seamount (thus termed in this study; ∼240 m) is located in the productive East African Coastal (EAFR) province with high mesoscale activities to the south of Madagascar. This resulted in higher micronekton species richness at MAD-Ridge compared to La Pérouse. Resulting productivity at MAD-Ridge seamount was likely due to the action of mesoscale...
Tipo: Text Palavras-chave: Micronekton; Seamount; South-western Indian Ocean; Acoustics; Seamount-associated fauna.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00510/62135/66368.pdf
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On the presence of the rissoid gastropod Alvania lamellata Dautzenberg, 1889 on the top of the azorean Condor seamount (206 m depth) ArchiMer
Le Duff, Michel; Bongiorni, Lucia; Zeppilli, Daniela; Grall, Jacques.
This note reports the presence of the rissoid gastropod Alvania lamellata Dautzenberg, 1889 on the top of the Condor seamount (Azores) at 206 m depth. This allows reconsideration of the ecology of the species which lives in the deep circalittoral rather than in the bathyal zone.
Tipo: Text Palavras-chave: Rissoidae; Alvania lamellata; Açores; Mont sous-marin; Étage; Rissoidae; Alvania lamellata; Azores; Seamount; Habitat.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00199/31051/29471.pdf
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Southern High Latitude Squat Lobsters: Galatheoidea and Chirostyloidea from Macquarie Ridge with Description of a New Species of Uroptychus ArchiMer
Ahyong, Shane T.; Schnabel, Kareen E.; Baba, Keiji.
Macquarie Ridge is one of the southernmost seamount ridges, spanning 1600 kilometres from the southern tip of New Zealand to the Australia-Pacific-Antarctic triple junction halfway to Antarctica. Squat lobsters, superfamilies Chirostyloidea and Galatheoidea, are highly diverse at low and mid-latitudes, declining rapidly towards the poles; only 15 of the more than 1000 species have been recorded south of 50 degrees S. Prior to the present study, one species of squat lobster (Munidopsis pyrochela, Munidopsidae) was known from the Macquarie Ridge, but recent research voyages in 2003 and 2008 collected a further five species from both superfamilies and three families. Uroptychus tracey (Chirostylidae) is new to science. Uroptychus insignis (Henderson, 1885) is...
Tipo: Text Palavras-chave: Anomura; Galatheoidea; Chirostyloidea; New Zealand; Macquarie Ridge; Southern Ocean; Seamount.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00351/46250/46100.pdf
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The hydroid fauna of Tasmanian seamounts Naturalis
Watson, J.E.; Vervoort, W..
Seventy seamounts 50 to 100 km off South East Cape, southern Tasmania, rise from depths of 1000- 2000 m on the Australian continental slope. Sampling of the slopes of 14 seamounts was undertaken in 1997 by the Australian Commonwealth Scientific & Industrial Research Organisation (CSIRO). The collection yielded 14 species of hydroids, six of which are new, including two species of a new genus. Only Halecium fragile Hodgson, 1950, and Tripoma arboreum Hirohito, 1995, have previously been recorded from Tasmania. Other species are known from deep water off New Zealand, Japan and the south-western Atlantic.
Tipo: Article / Letter to the editor Palavras-chave: Tasmania; Australia; Seamount; Hydroids; 42.79.
Ano: 2001 URL: http://www.repository.naturalis.nl/record/219453
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Variability and seasonality of physical and biological fields at the Great Meteor Tablemount (subtropical NE Atlantic) ArchiMer
Mourino, B; Fernandez, E; Serret, P; Harbour, D; Sinha, B; Pingree, R.
Five oceanographic surveys were conducted at the Great Meteor Tablemount (subtropical NE Atlantic; 30.0 degreesN, 28.5 degreesW) throughout the 1992-1999 period tc, investigate temporal variability in the relationship between the physical structure of the water column associated with the seamount and phytoplankton biomass and/or production rates. Local increases in chlorophyll a, enhanced carbon incorporation rates and changes in phytoplankton species composition were associated with the seamount. These effects were subjected to a large degree of temporal and spatial variability both at seasonal and shorter time scales.
Tipo: Text Palavras-chave: Variabilité physique; Phytoplancton; Production primaire; Mont sous-marin; Atlantique subtropical; Physical variability; Phytoplankton; Primary production; Seamount; Subtropical Atlantic.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43362/42853.pdf
Registros recuperados: 7
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