scholarly journals Ichtyological diversity in a tropical nature reserve (Etang de Saint-Paul, Réunion Island) from environmental DNA (eDNA) metabarcoding

2021 ◽  
Vol 4 ◽  
Author(s):  
Natacha Nikolic ◽  
Emmanuel Corse ◽  
Nicolas Juillet
Keyword(s):  
Poster Session ◽  
Nature Reserve ◽  
Phylogenetic Analyses ◽  
Saint Paul ◽  
Environmental Dna ◽  
Reunion Island ◽  
Sampling Area ◽  
Natural Reserve ◽  
Mitochondrial Region ◽  
Réunion Island

The aim of this study was to test whether the ichthyological diversity of one natural reserve in Reunion Island (Réserve de l'Etang de Saint-Paul) could be established with a molecular tool, environmental DNA (eDNA). We hence filtrated the water (2L) at 10 different areas around the reserve. For each sampling area, 12 PCR replicas were performed and the identification of fish species was carried out by metabarcoding through a primer over a mitochondrial region (12S). This study showed the importance of reference sequencing databases as well as improvements through phylogenetic analyses. This first fish study by eDNA in La Réunion also revealed the coherence of the distribution of species and their habitat. See the Poster in Suppl. material 1. Collection : 1st DNAQUA International Conference - poster session.

scholarly journals Highs and lows of the resortification of the Saint-Paul coast (Reunion Island)

2013 ◽  
Vol 17 (1) ◽  
Author(s):  
Jean-Michel Jauze
Keyword(s):  
Saint Paul ◽  
Reunion Island ◽  
Réunion Island

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 Ultralight aircraft surveys reveal marine turtle population increases along the west coast of Reunion Island

Oryx ◽  
2010 ◽  
Vol 44 (2) ◽  
pp. 223-229 ◽  
Author(s):  
Claire Jean ◽  
Stéphane Ciccione ◽  
Katia Ballorain ◽  
Jean-Yves Georges ◽  
Jérôme Bourjea
Keyword(s):  
West Coast ◽  
Marine Protected Area ◽  
Saint Paul ◽  
Marine Turtle ◽  
Reunion Island ◽  
The West ◽  
Outer Reef ◽  
Marine Turtles ◽  
South West Indian Ocean ◽  
Réunion Island

AbstractReunion Island in the south-west Indian Ocean once had significant nesting populations of marine turtles but they declined rapidly after human colonization. In 1996, after regular sightings of turtles offshore, an aerial survey programme was initiated to monitor the occurrence of marine turtles and their distribution along the west coast of the island. Between 1998 and 2008, along a 30-km coastline transect between Saint Leu and Saint Paul, a total of 1,845 marine turtle sightings were recorded during 146 flights with an ultralight aircraft. The mean number of turtle sightings per survey increased significantly between 1998 and 2008, and a variety of sizes were recorded throughout the year. Marine turtles were found over coral reef zones and on the outer reef slopes. Spatial distribution may be linked to the topography and substrate of the bottom, which determine the availability of food and shelter. The marine protected area located off Saint Paul seems to have benefited marine turtles as they frequent this area more than other regions on the west coast. These results are encouraging for local organizations working for the conservation of marine turtles on Reunion Island.

scholarly journals Tsunami hazard in La Réunion island from numerical modeling of historical events

2013 ◽  
Vol 1 (3) ◽  
pp. 1823-1855
Author(s):  
E. Quentel ◽  
A. Loevenbruck ◽  
H. Hébert ◽  
S. Allgeyer
Keyword(s):  
Numerical Modeling ◽  
Saint Paul ◽  
Tsunami Hazard ◽  
Reunion Island ◽  
La Réunion ◽  
Historical Events ◽  
Réunion Island ◽  
Wave Heights ◽  
La Réunion Island ◽  
The Impact

Abstract. Whereas major tsunamis have recently affected the southwest Indian Ocean, tsunami hazard in this basin has never been thoroughly examined. Our study contributes to fill in this lack and focuses on La Réunion island for which tsunami hazard related to great earthquakes is evaluated by modeling the scenarios of major historical events. Then, our numerical modeling allow us to compare the tsunami impact at regional scale according to the seismic sources; we thus identify earthquakes locations which most affect the island and describe the impact distribution along its coastline. Thirdly, detailed models are performed for selected sites based on high resolution bathymetric and topographic data; they provide estimations of the water currents, wave heights and potential inundations. When available, field measurements and tide records allow testing our models. Arrival time, amplitude of the first wave and impact on the tide gauge time series are well reproduced. Models are consistent with the observations. The west coast of La Réunion is the most affected (to 2.7 m in the harbour of Le Port Est for 2004 event) by transoceanic tsunamis. Numerical modeling has been performed at Saint-Paul for the 2004 Sumatra-Andaman event and 1833 Sumatra event; the low topography of this town could make it vulnerable to tsunami waves. Harbours, particularly prone to undergo significant damages, are also examined. Outside the harbours as well as at Saint-Paul, inundations are predicted along the coastline due to important local wave heights (> 2.5 m).

scholarly journals First record of Torquigener flavimaculosus (Actinopterygii: Tetraodontiformes: Tetraodontidae) from Réunion island

2021 ◽  
Vol 51 (4) ◽  
pp. 345-348
Author(s):  
Jean Gadenne ◽  
Patrick Durville ◽  
Julien Wickel ◽  
Eric Hoarau ◽  
Arnault Gauthier ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Red Sea ◽  
Saint Paul ◽  
Western Indian Ocean ◽  
First Record ◽  
Reunion Island ◽  
Video Observations ◽  
Réunion Island ◽  
The Mediterranean

The first record of the yellow-spotted puffer, Torquigener flavimaculosus Hardy et Randall, 1983, on Reunion Island is confirmed by numerous video observations and by the capture of a specimen. This tetraodontid fish has been reported from the western Indian Ocean, the Red Sea, and the Mediterranean. In this report, we confirm its presence in Saint-Paul Bay in Réunion and this new observation completes the ichthyological inventory of Réunion Island.

Prevalence and risk factors susceptibility of Salmonella spp., Campylobacter spp. and Listeria spp. isolated from pork and poultry sausages, in Reunion Island, France

2013 ◽  
Author(s):  
A. Trimoulinard ◽  
C. Tessier ◽  
M. Beral ◽  
L. Atiana ◽  
I. Henry ◽  
...  
Keyword(s):  
Risk Factors ◽  
Reunion Island ◽  
Salmonella Spp ◽  
Réunion Island ◽  
Campylobacter Spp

scholarly journals Cloud Radar Observations of Diurnal and Seasonal Cloudiness over Reunion Island

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 868
Author(s):  
Jonathan Durand ◽  
Edouard Lees ◽  
Olivier Bousquet ◽  
Julien Delanoë ◽  
François Bonnardot
Keyword(s):  
Sea Breeze ◽  
Satellite System ◽  
Research Infrastructure ◽  
Weather Data ◽  
Reunion Island ◽  
Wet Season ◽  
Trade Winds ◽  
Cloud Radar ◽  
Réunion Island ◽  
Global Navigation Satellite

In November 2016, a 95 GHz cloud radar was permanently deployed in Reunion Island to investigate the vertical distribution of tropical clouds and monitor the temporal variability of cloudiness in the frame of the pan-European research infrastructure Aerosol, Clouds and Trace gases Research InfraStructure (ACTRIS). In the present study, reflectivity observations collected during the two first years of operation (2016–2018) of this vertically pointing cloud radar are relied upon to investigate the diurnal and seasonal cycle of cloudiness in the northern part of this island. During the wet season (December–March), cloudiness is particularly pronounced between 1–3 km above sea level (with a frequency of cloud occurrence of 45% between 12:00–19:00 LST) and 8–12 km (with a frequency of cloud occurrence of 15% between 14:00–19:00 LST). During the dry season (June–September), this bimodal vertical mode is no longer observed and the vertical cloud extension is essentially limited to a height of 3 km due to both the drop-in humidity resulting from the northward migration of the ITCZ and the capping effect of the trade winds inversion. The frequency of cloud occurrence is at its maximum between 13:00–18:00 LST, with a probability of 35% at 15 LST near an altitude of 2 km. The analysis of global navigation satellite system (GNSS)-derived weather data also shows that the diurnal cycle of low- (1–3 km) and mid-to-high level (5–10 km) clouds is strongly correlated with the diurnal evolution of tropospheric humidity, suggesting that additional moisture is advected towards the island by the sea breeze regime. The detailed analysis of cloudiness observations collected during the four seasons sampled in 2017 and 2018 also shows substantial differences between the two years, possibly associated with a strong positive Indian Ocean Southern Dipole (IOSD) event extending throughout the year 2017.

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