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| Registros recuperados: 110 | |
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| Naqvi,S.W.A. |
| The Indian Ocean contains one of the oceans' most pronounced oxygen minimum zones (OMZ), which, anomalously, is the most intense in the northwestern sector (Arabian Sea). It also contains the majority of the area of oceanic continental margins in contact with oxygen-depleted waters. Impacts of the oxygen deficiency on regional biogeochemistry, especially anaerobic nitrogen transformations, are described. A comparison of the perennial, mesopelagic OMZ in the open Northwestern Indian Ocean is made with a shallower oxygen deficient system that develops seasonally (during late summer and autumn) over the western Indian shelf. The latter appears to have intensified in recent years presumably due to anthropogenic nutrient loading from land. |
| Tipo: Journal article |
Palavras-chave: Indian Ocean; Nitrogen cycling; Denitrification; N2O; Eutrophication. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300011 |
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| Meyzen, Cm; Ludden, Jn; Humler, E; Luais, B; Toplis, Mj; Mevel, C; Storey, M. |
| We report new Sr, Nd, and Pb isotope data for Mid-Ocean Ridge Basalts (MORB) dredged between 35 and 69 degrees E along a similar to 4100 km section of the Southwest Indian Ridge (SWIR), which is one of the slowest spreading ridges of the global mid-ocean ridge system ( full rate of 16 mm yr(-1)). The SWIR appears isotopically more heterogeneous than other mid-ocean ridges over similar length scales and comparable sampling density. Isotopic variations are generally independent of ridge segmentation, and the degree of heterogeneity decreases from west to east. This decrease in heterogeneity correlates with the observed increase in axial depth and decrease in crustal thickness, commonly attributed to decreasing mantle potential temperature. Data for the... |
| Tipo: Text |
Palavras-chave: Southwest Indian Ridge; MORB; Isotopes; Indian Ocean; Lower crust; Mantle. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00232/34286/32655.pdf |
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| Paulmier, Gerard. |
| L'inventaire et la distribution des tintinnides, un des principaux groupes du zooplancton, ont pu ètre effectués sur des échantillons de plancton provenant de diverses régions marines : dans l'Atlantique boréal occidental, du Labrador au Banc Georges, dans la Province caraïbe et en Mer des Sargasses, dans l'Atlantique central, de l'ouest des Açores à la côte africaine, dans l'Atlantique oriental, en Manche, dans le Golfe de Gascogne et en Méditerranée, ainsi que dans l'Océan Indien, depuis la Mer Rouge jusqu'à l'est-sud-est des îles Kerguelen, au niveau de la convergence antarctique. Les résultats acquis confirment, globalement, les observations antérieures sur la distribution de ces protozoaires, aussi connus pour leur grande variabilité morphologique... |
| Tipo: Text |
Palavras-chave: Tintinnides; Atlantique; Océan Indien; Inventaire; Distribution; Tintinnids; Atlantic; Indian Ocean; Inventory; Distribution. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00424/53609/54429.pdf |
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| Rodriguez, M.; Fournier, M.; Chamot-rooke, Nicolas; Huchon, P.; Bourget, Julien; Sorbier, M.; Zaragosi, S.; Rabaute, A.. |
| The Owen Fracture Zone is a 800 km-long fault system that accommodates the dextral strike-slip motion between India and Arabia plates. Because of slow pelagic sedimentation rates that preserve the seafloor expression of the fault since the Early Pliocene, the fault is clearly observed on bathymetric data. It is made up of a series of fault segments separated by releasing and restraining bends, including a major pull-apart basin at latitude 20 degrees N. Some distal turbiditic channels from the Indus deep-sea fan overlap the fault system and are disturbed by its activity, thus providing landmarks to date successive stages of fault activity and structural evolution of the Owen Fracture Zone from Pliocene to Present. We determine the durability of relay... |
| Tipo: Text |
Palavras-chave: Indian Ocean; Owen Fracture Zone; Pull-apart; Transform fault. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00133/24426/22435.pdf |
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| Bourjea, Jerome; Clermont, Sandra; Delgado, Alicia; Murua, Hilario; Ruiz, Jon; Ciccione, Stephane; Chavance, Pierre. |
| Bycatch of endangered marine turtles is a growing issue for the management of all fisheries, including the oceanic purse-seine fishery. The aim of this study was to assess the spatial and temporal variation in bycatch rates of these species in the entire European purse-seine fishery operating in the Atlantic and Indian oceans. The study was based on data collected through observer programs from 1995 to 2011. During that period, a total of 15 913 fishing sets were observed, including 6 515 on Drifting Fish Aggregating Devices (DFADs) and 9 398 on free swimming schools, representing a global coverage of 10.3% and 5.1% of the total fishing activity in the Atlantic and Indian Ocean, respectively. Moreover, from 2003 to 2011, 14 124 specific observations were... |
| Tipo: Text |
Palavras-chave: Bycatch; Marine turtle; Fishery impacts; Fishery management; Atlantic Ocean; Indian Ocean. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00206/31760/30632.pdf |
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| Muths, Delphine; Grewe, R.; Jean, Claire; Bourjea, Jerome. |
| Genetic variation was surveyed at 11 microsatellite loci and at 517 bp of the mitochondrial control region to investigate the presence of genetic stock structure in swordfish (Xiphias gladius) in four proximal localities of the southwest Indian Ocean. One aim of this study was to serve as a preliminary examination for congruency of structure detected by these two genetic markers, prior to conducting a more comprehensive basin-wide survey of the Indian Ocean and nearby surrounding areas. Analyses of multilocus microsatellite genotypes and mitochondrial control region sequences both revealed a great homogeneity between samples. Genetic diversity detected at the regional scale was not significantly higher than detected at the local scale. Results suggest that... |
| Tipo: Text |
Palavras-chave: Indian Ocean; Population genetic; MtDNA; Microsatellites; Swordfish. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6455.pdf |
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| Fraussen, Koen; Galindo, Lee Ann; Rosado, Jose. |
| Deep-water species from the western Indian Ocean off the East African coast and Madagascar, belonging to the subfamily Photinae, are discussed and compared with species from the West Pacific. Phos elegantissimus Hayashi & Habe, 1965, P. hirasei Sowerby, 1913 and P laevis Kuroda & Habe in Habe, 1961 are recorded from Mozambique and/or from Madagascar, hereby extending their known range considerably into the western Indian Ocean. The East African specimens formerly assigned to Phos roseatus Hinds, 1844 are found to differ from this West Pacific species. In total, five species arc described as new: Phos ganii sp. nov., P geminus sp. nov., P. ladoboides sp. nov., P. pulchritudus sp. nov. and P. testaceus sp. nov. |
| Tipo: Text |
Palavras-chave: Nassariidae; Photinae; Indian Ocean; Eastern Africa; Deep-water. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00688/79987/82961.pdf |
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| Fontaine, Fabrice R.; Barruol, Guilhem; Tkalcic, Hrvoje; Woelbern, Ingo; Ruempker, Georg; Bodin, Thomas; Haugmard, Meric. |
| The Piton de la Fournaise basaltic volcano, on La Réunion Island in the western Indian Ocean, is one of the most active volcanoes in the world. This volcano is classically considered as the surface expression of an upwelling mantle plume and its activity is continuously monitored, providing detailed information on its superficial dynamics and on the edifice structure. Deeper crustal and upper mantle structure under La Réunion Island is surprisingly poorly constrained, motivating this study. We used receiver function techniques to determine a shear wave velocity profile through the crust and uppermost mantle beneath La Réunion, but also at other seismic stations located on the hotspot track, to investigate the plume and lithosphere interaction and its... |
| Tipo: Text |
Palavras-chave: Surface waves and free oscillations; Oceanic hotspots and intraplate volcanism; Hotspots; Crustal structure; Indian Ocean. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00287/39830/38352.pdf |
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| Bourget, J.; Zaragosi, S.; Garlan, T.; Gabelotaud, I.; Guyomard, P.; Dennielou, Bernard; Ellouz-zimmermann, N.; Schneider, J. L.. |
| During the Fanindien 2006 cruise of R/V 'Beautemps-Beaupre', high resolution multibeam bathymetry, sub-bottom profiling and sediment coring was carried out along the East African margin, offshore Tanzania and Mozambique (Indian Ocean). The newly acquired data reveal the presence of a giant deep-sea valley (the Tanzania channel) that is more than 10 km wide at 4000 m water depth, along the continental rise. The valley remains similar to 70 m deep and 7 km wide at 800 km from the Tanzania coast. Morphological comparison with worldwide submarine channels show that the Tanzania channel is one of the largest known submarine valleys. This discovery brings new light on development of submarine valleys that drain sediments originated from the East African Rift... |
| Tipo: Text |
Palavras-chave: Indian Ocean; East African margin; East African Rift System; Turbidite system; Submarine channel. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6855.pdf |
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| Alvarez, M.; Tanhua, T.; Brix, H.; Lo Monaco, C.; Metzl, N.; Mcdonagh, E. L.; Bryden, H. L.. |
| Within the Subantarctic Mode Water (SAMW) density level, we study temporal changes in salinity, nutrients, oxygen and TTD (Transit Time Distribution) ages in the western (W) and eastern (E) subtropical gyre of the Indian Ocean (IO) from 1987 to 2002. Additionally, changes in Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC) are evaluated between 1995 and 2002. The mechanisms behind the detected changes are discussed along with the results from a hindcast model run (Community Climate System Model). The increasing salinity and decreasing oxygen trends from 1960 to 1987 reversed from 1987 to 2002 along the gyre. In the W-IO a decreasing trend in TTD ages points to a faster delivery of SAMW, thus less biogenic matter remineralization, explaining the... |
| Tipo: Text |
Palavras-chave: Indian Ocean; Subantarctic Mode Water; Biogeochemistry. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00253/36400/34942.pdf |
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| Zubia, M; Peyrot-clausade, M. |
| Bioerosion by grazing and boring organisms is one of the major destructive forces operating on reef. The aim of this study was to estimate the intensity of internal bioerosion by both microflora and fauna of Acropora, a branching scleractinian, on the reef flat at La Saline (Reunion, Indian Ocean). Internal bioerosion was estimated at two sites, varying in degrees of eutrophication. At each site, dead Acropora subjected to heavy grazing or covered by algal turf were examined. Acropora formosa is subjected to high bioerosion due to its high porosity and its branching form, which facilitates colonisation by boring organisms. Three endolithic microflora species, Plectonema terebrans, Mastigocoleus testarum and Ostreobium queckettii colonised the branches. The... |
| Tipo: Text |
Palavras-chave: Acropora; Bioérosion; Organismes perforants; Récifs coralliens; Océan Indien; Acropora; Bioerosion; Boring organisms; Coral reef; Indian Ocean. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43353/42860.pdf |
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| Thompson, Joseph Offei; Moulin, Maryline; Aslanian, Daniel; De Clarens, P.; Guillocheau, F.. |
| The amalgamation of Gondwana and its subsequent fragmentation has been a subject of several studies over the past five decades, yet the very important question of the initial geometry of the supercontinent remains enigmatic. Current reconstruction models of the Indian Ocean are characterized by large gaps, overlaps and misfits of major structural and Cratonic bodies in their fit, and positions of tectonic blocks that are inconsistent with field observations, a phenomenon sustained by inadequate data, long standing debates and a lack of consensus on the nature of major structures and basins in the ocean. Past attempts to reconstruct the initial fit of the ocean has led to varied and complex models, with their own logic and different geographical limits,... |
| Tipo: Text |
Palavras-chave: Gondwana; Plate tectonics; Indian Ocean; PanAfrican structures; Amalgamation; Kinematic evolution. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00481/59298/61992.pdf |
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| Bourjea, Jerome; Mortimer, Jeanne A.; Garnier, Julie; Okemwa, Gladys; Godley, Brendan J.; Hughes, George; Dalleau, Mayeul; Jean, Claire; Ciccione, Stephane; Muths, Delphine. |
| To refine our understanding of the spatial structure of the green turtle (Chelonia mydas) populations in the South West Indian Ocean (SWIO), we analysed patterns of mitochondrial DNA (396 base pairs control region fragment) variation among 171 samples collected at five distinct locations (Kenya, Northern Mozambique, and three locations in the Republic of Seychelles: the Granitic, Amirantes, and Farquhar groups) and compared them to genetic data (n = 288), previously collected from 10 southern locations in the SWIO. We also analysed post-nesting satellite tracks (n = 4) from green turtles nesting in the Amirantes group. Pairwise comparisons of haplotype frequencies showed significant genetic differentiation amongst rookeries and suggest that the SWIO hosts... |
| Tipo: Text |
Palavras-chave: Indian Ocean; MtDNA; Satellite tracking; Phylogeography; Management unit; Chelonia mydas. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00266/37732/36062.pdf |
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| Dobler, Delphine; Huck, Thierry; Maes, Christophe; Grima, Nicolas; Blanke, Bruno; Martinez, Elodie; Ardhuin, Fabrice. |
| In the open ocean, floating surface debris such as plastics concentrate in five main accumulation zones centered around 30° latitude, far from highly turbulent areas. Using Lagrangian advection of numerical particles by surface currents from ocean model reanalysis, previous studies have shown long-distance connection from the accumulation zones of the South Indian to the South Pacific oceans. An important physical process affecting surface particles but missing in such analyses is wave-induced Stokes drift. Taking into account surface Stokes drift from a wave model reanalysis radically changes the fate of South Indian particles. The convergence region moves from the east to the west of the basin, so particles leak to the South Atlantic rather than the... |
| Tipo: Text |
Palavras-chave: Marine debris; Microplastics; Stokes drift; Indian Ocean; Lagrangian analysis; Ocean surface pathways. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00512/62320/69273.pdf |
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| Registros recuperados: 110 | |
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