scholarly journals Circulation around La Réunion and Mauritius islands in the south-western Indian Ocean: A modeling perspective

2014 ◽  
Vol 119 (3) ◽  
pp. 1957-1976 ◽  
Author(s):  
Stéphane Pous ◽  
Pascal Lazure ◽  
Gaël André ◽  
Franck Dumas ◽  
Issufo Halo ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
La Réunion ◽  
The South

scholarly journals Contrasted accumulation patterns of persistent organic pollutants and mercury in sympatric tropical dolphins from the south-western Indian Ocean

2016 ◽  
Vol 146 ◽  
pp. 263-273 ◽  
Author(s):  
Alin C. Dirtu ◽  
Govindan Malarvannan ◽  
Krishna Das ◽  
Violaine Dulau-Drouot ◽  
Jeremy J. Kiszka ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Western Indian Ocean ◽  
The South

scholarly journals Micronekton distributions and assemblages at two shallow seamounts of the south-western Indian Ocean: Insights from acoustics and mesopelagic trawl data

2019 ◽  
Vol 178 ◽  
pp. 102161 ◽  
Author(s):  
Pavanee Annasawmy ◽  
Jean-François Ternon ◽  
Pascal Cotel ◽  
Yves Cherel ◽  
Evgeny V. Romanov ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
The South

scholarly journals Morphology and distribution of the acorn barnacle Tetraclita reni nom. nov. (Crustacea: Cirripedia) in Madagascar and adjacent waters

Zootaxa ◽  
2009 ◽  
Vol 2019 (1) ◽  
pp. 57-68 ◽  
Author(s):  
BENNY KWOK KAN CHAN ◽  
CHIH-HSIUNG HSU ◽  
PEI-CHEN TSAI
Keyword(s):  
South Africa ◽  
Indian Ocean ◽  
Light Microscopy ◽  
East Africa ◽  
Western Indian Ocean ◽  
Type Locality ◽  
Museum Specimens ◽  
The South ◽  
Acorn Barnacle ◽  
Distribution Record

In Madagascan waters, both Tetraclita rufotincta Pilsbry 1916 and T. africana Ren 1989 have been reported. Tetraclita rufotincta is more widely distributed than T. africana, extending to the western Indian Ocean and east Africa. Tetraclita africana is reported from Madagascar and no further distribution record has been made apart from its type locality. Both species have pink parietes and are similar in size, which could lead to identification confusion. In this study, we revealed that T. africana differed from T. rufotincta in having multicuspidate setae on cirrus III, a feature that can be observed with both light microscopy and SEM. Additionally, the tergum of T. africana has a rounded spur and a larger basi-scutal angle than that of T. rufotincta. However, since the name Tetraclita africana has been pre-occupied under the name Tesseropora (Tetraclita) wireni africana Nilsson-Cantell, 1932, we, therefore, propose herein a replacement name, Tetraclita reni nom. nov. Based on museum specimens examined, Tetraclita reni nom. nov. is present in northeastern and southern Madagascar and Mauritius but absent from Yemen, Kenya, South Africa, Aldabra and northwestern Madagascar, suggesting the distribution of T. reni nom. nov. could be confined to the south and northeast of Madagascar and adjacent waters.

scholarly journals Tomography of crust and lithosphere in the western Indian Ocean from noise cross-correlations of land and ocean bottom seismometers

2019 ◽  
Vol 219 (2) ◽  
pp. 924-944 ◽  
Author(s):  
Sarah Hable ◽  
Karin Sigloch ◽  
Eléonore Stutzmann ◽  
Sergey Kiselev ◽  
Guilhem Barruol
Keyword(s):  
Indian Ocean ◽  
Group Velocity ◽  
Western Indian Ocean ◽  
Spreading Ridge ◽  
Ocean Bottom ◽  
Depth Range ◽  
La Réunion ◽  
Velocity Measurements ◽  
Ocean Bottom Seismometers ◽  
Cross Correlations

SUMMARY We use seismic noise cross-correlations to obtain a 3-D tomography model of SV-wave velocities beneath the western Indian Ocean, in the depth range of the oceanic crust and uppermost mantle. The study area covers 2000 × 2000 km2 between Madagascar and the three spreading ridges of the Indian Ocean, centred on the volcanic hotspot of La Réunion. We use seismograms from 38 ocean bottom seismometers (OBSs) deployed by the RHUM-RUM project and 10 island stations on La Réunion, Madagascar, Mauritius, Rodrigues, and Tromelin. Phase cross-correlations are calculated for 1119 OBS-to-OBS, land-to-OBS, and land-to-land station pairs, and a phase-weighted stacking algorithm yields robust group velocity measurements in the period range of 3–50 s. We demonstrate that OBS correlations across large interstation distances of >2000 km are of sufficiently high quality for large-scale tomography of ocean basins. Many OBSs yielded similarly good group velocity measurements as land stations. Besides Rayleigh waves, the noise correlations contain a low-velocity wave type propagating at 0.8–1.5 km s−1 over distances exceeding 1000 km, presumably Scholte waves travelling through seafloor sediments. The 100 highest-quality group velocity curves are selected for tomographic inversion at crustal and lithospheric depths. The inversion is executed jointly with a data set of longer-period, Rayleigh-wave phase and group velocity measurements from earthquakes, which had previously yielded a 3-D model of Indian Ocean lithosphere and asthenosphere. Robust resolution tests and plausible structural findings in the upper 30 km validate the use of noise-derived OBS correlations for adding crustal structure to earthquake-derived tomography of the oceanic mantle. Relative to crustal reference model CRUST1.0, our new shear-velocity model tends to enhance both slow and fast anomalies. It reveals slow anomalies at 20 km depth beneath La Réunion, Mauritius, Rodrigues Ridge, Madagascar Rise, and beneath the Central Indian spreading ridge. These structures can clearly be associated with increased crustal thickness and/or volcanic activity. Locally thickened crust beneath La Réunion and Mauritius is probably related to magmatic underplating by the hotspot. In addition, these islands are characterized by a thickened lithosphere that may reflect the depleted, dehydrated mantle regions from which the crustal melts where sourced. Our tomography model is available as electronic supplement.

scholarly journals Cytoplasmic Incompatibility as a Means of Controlling Culex pipiens quinquefasciatus Mosquito in the Islands of the South-Western Indian Ocean

2011 ◽  
Vol 5 (12) ◽  
pp. e1440 ◽  
Author(s):  
Célestine M. Atyame ◽  
Nicole Pasteur ◽  
Emilie Dumas ◽  
Pablo Tortosa ◽  
Michaël Luciano Tantely ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Culex Pipiens ◽  
Cytoplasmic Incompatibility ◽  
Western Indian Ocean ◽  
The South ◽  
Culex Pipiens Quinquefasciatus
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