scholarly journals Electrical structure of Plaine des Sables caldera, Piton de la Fournaise volcano (Reunion Island)

1997 ◽  
Vol 40 (2) ◽  
Author(s):  
P. A. Schnegg
Keyword(s):  
Electrical Properties ◽  
Indian Ocean ◽  
Hot Spot ◽  
Western Indian Ocean ◽  
Conducting Layer ◽  
Reunion Island ◽  
Shield Volcano ◽  
Final Model ◽  
Piton De La Fournaise ◽  
Réunion Island

An Audio Magnetotelluric (AMT) profile has been carried out across the Plaine des Sables, a former caldera of the active Piton de la Fournaise volcano, Reunion Island. Located in the Western Indian Ocean, between the Mascarene and Madagascar basins, this basaltic shield volcano originates from the activity of a hot spot. Our aim was to determine the internal structure of the volcano, in particular the shallow electrical properties of an area extending between the old and the new caldera rims. Although several teams had already conducted AMT work in this region a few years ago, there was a need for more a detailed, in depth survey. Our final model displays a noticeable slope of the Plaine des Sables basement oriented toward the present Fournaise summit. This slope is interpreted as resulting from successive landslides toward the ocean. We conclude that this dipping, electrically good conducting layer, probably belongs to the flat layering of an older caldera.

Cave-dwelling crabs of the genus Karstarma from lava tubes of the volcano ‘Piton de la Fournaise’, in Réunion Island, with description of a new species and redescription of Karstarma jacksoni (Balss, 1934) from Christmas Island (Decapoda, Brachyura, Sesarmidae)

Zootaxa ◽  
2018 ◽  
Vol 4497 (3) ◽  
pp. 381 ◽  
Author(s):  
JOSEPH POUPIN ◽  
NICOLE CRESTEY ◽  
JEAN-PAUL LE GUELTE
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Reunion Island ◽  
Lava Tubes ◽  
Piton De La Fournaise ◽  
Christmas Island ◽  
Réunion Island ◽  
First Time ◽  
A New Species

Sesarmid crabs of the genus Karstarma Davie & Ng, 2007 are reported for the first time in the Western Indian Ocean: they were discovered in the lava tubes of the volcano ‘Piton de la Fournaise’, Réunion Island. A new species, morphologically similar to Karstarma jacksoni (Balss, 1934) from Christmas Island, Eastern Indian Ocean, is recognized and described. A redescription of K. jacksoni is also provided. A second species is recognized, but being represented in the collection by a single juvenile, it cannot be identified to species level until more collections are made in the lava tubes. [Zoobank: http://zoobank.org/NomenclaturalActs/C70A95B2-D667-491D-BD35-5DF32E3FFB08] 

scholarly journals Bat coronavirus phylogeography in the Western Indian Ocean

2019 ◽  
Author(s):  
Léa Joffrin ◽  
Steven M. Goodman ◽  
David A. Wilkinson ◽  
Beza Ramasindrazana ◽  
Erwan Lagadec ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Phylogenetic Analyses ◽  
Strong Association ◽  
Western Indian Ocean ◽  
Reunion Island ◽  
High Genetic Diversity ◽  
Soil Fertilization ◽  
Réunion Island ◽  
History Of ◽  
Bat Coronavirus

AbstractBats provide key ecosystem services such as crop pest regulation, pollination, seed dispersal, and soil fertilization. Bats are also major hosts for biological agents responsible for zoonoses, such as coronaviruses (CoVs). The islands of the Western Indian Ocean are identified as a major biodiversity hotspot, with more than 50 bat species. In this study, we tested 1,013 bats belonging to 36 species from Mozambique, Madagascar, Mauritius, Mayotte, Reunion Island and Seychelles, based on molecular screening and partial sequencing of the RNA-dependent RNA polymerase gene. In total, 88 bats (8.7%) tested positive for coronaviruses, with higher prevalence in Mozambican bats (20.5% ± 4.9%) as compared to those sampled on islands (4.5% ± 1.5%). Phylogenetic analyses revealed a large diversity of α- and β-CoVs and a strong signal of co-evolution between CoVs and their bat host species, with limited evidence for host-switching, except for bat species sharing day roost sites.ImportanceThis is the first study to report the presence of coronaviruses (CoVs) in bats in Mayotte, Mozambique and Reunion Island, and in insectivorous bats in Madagascar. Eight percent of the tested bats were positive for CoVs, with higher prevalence in continental Africa than on islands. A high genetic diversity of α- and β-CoVs was found, with strong association between bat host and virus phylogenies, supporting a long history of co-evolution between bats and their associated CoVs in the Western Indian Ocean. These results highlight that strong variation between islands does exist and is associated with the composition of the bat species community on each island. Future studies should investigate whether CoVs detected in these bats have a potential for spillover in other hosts.

scholarly journals Modelling with stakeholders to integrate biodiversity into land-use planning – Lessons learned in Réunion Island (Western Indian Ocean)

2010 ◽  
Vol 25 (11) ◽  
pp. 1413-1427 ◽  
Author(s):  
Erwann Lagabrielle ◽  
Aurélie Botta ◽  
Williams Daré ◽  
Daniel David ◽  
Sigrid Aubert ◽  
...  
Keyword(s):  
Land Use ◽  
Indian Ocean ◽  
Land Use Planning ◽  
Western Indian Ocean ◽  
Lessons Learned ◽  
Reunion Island ◽  
Réunion Island

scholarly journals Edifice growth, deformation and rift zone development in basaltic setting: Insights from Piton de la Fournaise shield volcano (Réunion Island)

2009 ◽  
Vol 184 (1-2) ◽  
pp. 14-30 ◽  
Author(s):  
Laurent Michon ◽  
Valérie Cayol ◽  
Ludovic Letourneur ◽  
Aline Peltier ◽  
Nicolas Villeneuve ◽  
...  
Keyword(s):  
Rift Zone ◽  
Reunion Island ◽  
Shield Volcano ◽  
Piton De La Fournaise ◽  
Réunion Island ◽  
Zone Development
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