International audience ; Reunion Island, a French overseas region located in the Indian Ocean, is facing a three-fold challenge combining demographics, the environment and energy. To limit its heavy dependence on imported fossil fuels, Reunion Island aims to achieve energy autonomy by 2030 based on greater energy efficiency and renewable energy alternatives. The objective of this study is to analyze different scenarios to reach electricity autonomy and, at the same time, consider the wide-scale integration of renewable energy in the island's power system using the bottom-up optimization energy model TIMES-Reunion. Despite the tremendous potential of renewable energy sources present on the island, the transition to 100% renewable energy needs to be supported by incentives or constraints. Strong energy policies can both direct the choice of renewable resources and accelerate the renewable transition. The development of biomass on Reunion Island is economically interesting. The transition scenarios show that by 2030, electricity from biomass advantageously replaces electricity from coal and represents slightly more than 50% of electricity generation. Solar and wave/ocean energies are not the most cost effective option, but wind energy tends to disappear in the face of these energies more politically supported. A network regulation rule benefits biomass and is more detrimental to solar than to wave energy. The decarbonized transition of the power system incurs higher total discounted system costs due to the additional costs induced by the different incentives to promote certain renewables, with some pathways toward energy autonomy appearing more costly than others.
International audience ; Reunion Island, a French overseas region located in the Indian Ocean, is facing a three-fold challenge combining demographics, the environment and energy. To limit its heavy dependence on imported fossil fuels, Reunion Island aims to achieve energy autonomy by 2030 based on greater energy efficiency and renewable energy alternatives. The objective of this study is to analyze different scenarios to reach electricity autonomy and, at the same time, consider the wide-scale integration of renewable energy in the island's power system using the bottom-up optimization energy model TIMES-Reunion. Despite the tremendous potential of renewable energy sources present on the island, the transition to 100% renewable energy needs to be supported by incentives or constraints. Strong energy policies can both direct the choice of renewable resources and accelerate the renewable transition. The development of biomass on Reunion Island is economically interesting. The transition scenarios show that by 2030, electricity from biomass advantageously replaces electricity from coal and represents slightly more than 50% of electricity generation. Solar and wave/ocean energies are not the most cost effective option, but wind energy tends to disappear in the face of these energies more politically supported. A network regulation rule benefits biomass and is more detrimental to solar than to wave energy. The decarbonized transition of the power system incurs higher total discounted system costs due to the additional costs induced by the different incentives to promote certain renewables, with some pathways toward energy autonomy appearing more costly than others.
International audience ; Reunion Island, a French overseas region located in the Indian Ocean, is facing a three-fold challenge combining demographics, the environment and energy. To limit its heavy dependence on imported fossil fuels, Reunion Island aims to achieve energy autonomy by 2030 based on greater energy efficiency and renewable energy alternatives. The objective of this study is to analyze different scenarios to reach electricity autonomy and, at the same time, consider the wide-scale integration of renewable energy in the island's power system using the bottom-up optimization energy model TIMES-Reunion. Despite the tremendous potential of renewable energy sources present on the island, the transition to 100% renewable energy needs to be supported by incentives or constraints. Strong energy policies can both direct the choice of renewable resources and accelerate the renewable transition. The development of biomass on Reunion Island is economically interesting. The transition scenarios show that by 2030, electricity from biomass advantageously replaces electricity from coal and represents slightly more than 50% of electricity generation. Solar and wave/ocean energies are not the most cost effective option, but wind energy tends to disappear in the face of these energies more politically supported. A network regulation rule benefits biomass and is more detrimental to solar than to wave energy. The decarbonized transition of the power system incurs higher total discounted system costs due to the additional costs induced by the different incentives to promote certain renewables, with some pathways toward energy autonomy appearing more costly than others.
Objective: Bluetongue (BT) and epizootic haemorrhagic disease (EHD) are arthropod-borne diseases of wild and domestic ruminants caused respectively by viruses belonging to the species Bluetongue virus (BTV) and Epizootic haemorrhagic disease virus (EHDV) within the genus Orbivirus of the Reoviridae. The viruses are transmitted between ruminants by biting midges of the genus Culicoides (Diptera: Ceratopogonidae). BTV went undetected in Reunion Island between its first documented emergence in 1979 and two other serious outbreaks with both BTV-3/ EHDV-6 in 2003, and both BTV-2/EHDV-6 in 2009. In these outbreaks, infected animals developed symptoms including hyperthermia, anorexia, congestion, prostration and nasal discharge. In order to get an overview of the circulation of BT/EHD in Reunion island, an assessment of the prevalence in ruminants native to Reunion Island by a cross-sectional study was undertaken in2011on 67 farms, including a total of 276 cattle, 142 sheep and 71 goats with a total of 489 ruminant samples. Data concerning farm characteristics, type of production, and number of animals were collected through farmer questionnaires for an evaluation of the associated risk factors. In addition, investigation of clinical cases based on the observation of clinical signs was also performed in order to get BTV/EHDV isolates with the aim to track the origins of the circulating strains. Methods: Risk factors analysis Data concerning farm characteristics, type of production, number of animals, closeness to another farm and sugar cane fields, presence of organic and other waste on the farm, exposure to wind, distance to a permanent water point, type of animal housing, presence of ticks on animals, use of treatment against ectoparasites and insects, animal's contacts with other animals or humans, grazing practice, spreading of manure on pastures, presence of Tenrece caudatus, rodent control, number of abortions in the herd in the last 12 months, purchasing behaviour, quarantine of newly purchased animals, other biosecurity factors like hygienic precautions taken by the staff or other people entering the farm (truck driver, vets and other visitors) were taken from a questionnaire which was filled in during an interview with the farmers. This questionnaire was pre-tested on five farms in a preliminary study. The final questionnaire comprised 40 questions of which 75% were closed-ended. Serological assays Specific anti-BTV antibodies were tested in serum samples with a group-specific competitive ELISA based on the VP7 protein using a commercial kit (LSIVetTM Ruminant BT Advanced II- Serum, Life technologies, France). Specific anti-EHDV antibodies were tested using a blocking commercial kit (LSIVetTM Ruminant EHDV-Serum ELISA kit, Life technologies, France). A Sunrise ELISA reader was used for reading at 450 nm (Tecan, France). Optical density values were converted to percentage inhibition (PI). According to the cut-off value of the test, test samples with PI values > 40% for BT and > 60% for EHD were considered as positive. BTV/EHDV genome detection For the BTV group specific real-time RT-PCR, 6 μl of denatured double-stranded RNA prepared with the EZ1 robot and EZ1® Virus Mini Kit v2.0 (Qiagen, France) were reverse transcribed (RT) and amplified using the onestep QuantiTect Probe RT-PCRkit (Qiagen, France) based on segment 1 developed by Toussaint et al. 2007. For the EHDV group specific real-time RT-PCR, 5 μl of denatured double-stranded RNA were reverse transcribed (RT) and amplified using the commercial TaqVetTM EHDV (Life technologies, France).The subgroup-specific EHDV RTPCR based on segment 2 was performed according to Sailleau et al., 2012.Embryonated chicken eggs (ECE) were each inoculated as previously described in Sailleau et al., 2012 Sequence analysis, alignment and phylogenetic analysis To identify the genetic relatedness of the detected virus, phylogenetic analyses were performed with published EHDV sequences. Sixteen full-length VP2 gene sequences were cleaned by hand from the results of several BLAST nucleotide searches as well as direct references from available up-to-date literature and then aligned using the ClustalW translation alignment tool in MEGA (Ver. 5.05). Phylogenetic analysis was performed using the neighbour-joining method using distance measures generated by the p-distance algorithm running 1, 000 iterations with Geneious® Pro. Statistics A Fisher exact test was used to compare differences in prevalence between diseases and species. All statistical procedures were performed using R.3.0.1. A value of P < 0.05 was considered significant. The prevalence rates were estimated as the overall mean and 95% confidence interval (CI). Results: The observed EHD prevalence rate in cattle was 63.77% (95% CI [57.99–69.55]), 5.63% (95% CI [0.03–10.99]) in goats, and 3.70% (95% CI [0.05–6.88]) in sheep, suggesting that EHD occurs more often in cattle than in goats and sheep. These findings were supported by a significant statistical difference in the EHD prevalence rate between species (Fisher exact test, P «2.2e-16). The observed BT prevalence rate in cattle was 79.62% (95% CI [74.77– 84.47]), 50.70% in goats (95% CI [39.08–62.33]) and 21.48% in sheep (95% CI [14.55–28.40]) with a significant difference in BT prevalence between species (Fisher exact test, P = 4.367e-10). Additionally, three suspected outbreaks occurred during the 2011 study period, one BTV/EHDV negative, one BTV specific and one combined BTV/EHDV outbreak. In total, 14 EHDV positive cases and 1 BTV/EHDV co - infection case were identified. Two further suspected outbreaks were confirmed to involve EHDV and BTV/EHDV. Isolations of EHDV were successful resulting in the identification of the Reunion -specific EHDV-1 serotype. Phylogenetic analyses of segment 2 showed that the Reunion isolate 6010 _2011 belongs to the group C (hypothesised in Anthony et al. 2009 together with EHDV-1 strains from Australia, 1995, Nigeria, 1967, French Guyana, 2011 and New Jersey, USA, 2011). In January 2014, once more suspected outbreaks occurred on cattle with observed clinical signs such as hyperthermia, congestion and nasal discharge. Virus isolations were successful and led us to identify a new EHDV serotype for Reunion island, the EHDV-7 serotype. Conclusion: Our results confirm that the prevalence of both BT and EHD is high and that both are likely currently circulating. A high risk of BTV and EHDV infections was associated with the introduction of ruminants from neighbouring farms without quarantine, the presence of organic and other waste on the farm, and treatment against ectoparasites and insects. New circulating EHDV serotype 1 and serotype 7 of unknown origin were isolated in 2011 and 2014 respectively. The mechanisms involved in the introduction, maintenance, and perpetuation of both BTV and EHDV orbiviruses in Reunion Island need to be further investigated. How and when the EHDV serotypes were introduced onto the island are unknown, the most likely being the introduction of infected animals from eastern and southern Africa, Madagascar or Australia over a period of many years. The introduction of Malagasy breeds, which could be considered as orbivirus susceptible breeds many decades ago, is one possible hypothesis. Since 1976, importation of domestic ruminants from these countries has stopped. Until 2008, imports were only from mainland France. The maintenance of both viruses in the livestock population could also be due to the presence of reservoirs such as deer as was the case in many places including southern California between 1990 and 2007 (Roug et al., 2012). Pathogens can easily be shared between wildlife and domestic ruminants which has implications for both the animal production industry and wildlife health. Whether animal reservoirs such as Rusa deer Cervus timorensis rusa imported from Mauritius Island and now present in Reunion Island play a role in EHDV epidemiology need to be investigated. The same species of Rusa deer was introduced on the island of Mauritius in 1639 and serological evidence of both EHDV and BTV circulation is documented. Since 1992, in accordance with European Union regulations, importation of live deer from Mauritius to Reunion Island is forbidden. The intermittent detection of certain serotypes and the occasional appearance of new serotypes suggest that, in the past, regular but separate introductions of BTV/EHDV may have also taken place from Madagascar, and from Southeast Asia including Mauritius via windborne Culicoides. Although it exists, the observed herd immunity in Reunion Island is not high enough to prevent the maintenance of an enzootic cycle, which could also be related to the abundance and activity of Culicoides throughout the year. The findings reported here provide additional hypotheses regarding the ecological characteristics of bluetongue and epizootic haemorrhagic disease and other vector -borne livestock diseases. Sentinel surveillance programmes are a useful way of documenting regionalization zones for diseases, which can be of great importance when securing livestock international markets.
In: Human biology: the international journal of population genetics and anthropology ; the official publication of the American Association of Anthropological Genetics, Band 77, Heft 5, S. 705-714
This paper presents the research framework of an on-going study on the dairy sector on La Reunion. This Indian Ocean island is one of the French overseas departments. However, it struggles with similar problems as the developing areas in its neighbourhood, high levels of unemployment especially being a major concern. The agricultural sector therefore justifies the state support it receives by indicating the creation of employment and economic activity. Our focus is on the dairy sector on the Island, which is relatively recent and highly organized. Local milk production has increased over the years, yet farmers are aware of future policy reforms that should liberalize the sector. The outcome for the sector is a major concern. Our research question is to what extent milk production is sustainable on La Reunion, including the question of a future without governmental subsidies. The aim of this paper is to discuss a conceptual framework, relevant research questions and methodology to answer these research questions.
8 pages ; International audience ; With the recent development of geospatial technologies, remote sensing data are more and more integrated in the information systems of crop industries. The satellite's ability to collect "snapshots" over large cropped areas at once makes it a unique tool to able it to acquire localized and objective data in real-time.In this paper, we present how this technology can provide reliable information for sugarcane planting and harvest monitoring by updating information on field/blocks boundaries and cane status using time series of satellite images. Through the experience conducted on Reunion Island (Indian Ocean) where the sugar industry has difficulty collecting updated localized information on smallholders fields, we show how SPOT satellite images can be interpreted and processed in order to produce thematic maps and statistics. These maps can then be integrated in a Geographic Information System (GIS) designed for decision makers. This on-the-shelf GIS permits one to visualize maps and edit monthly statistics of the management practices in each production area.
8 pages ; International audience ; With the recent development of geospatial technologies, remote sensing data are more and more integrated in the information systems of crop industries. The satellite's ability to collect "snapshots" over large cropped areas at once makes it a unique tool to able it to acquire localized and objective data in real-time.In this paper, we present how this technology can provide reliable information for sugarcane planting and harvest monitoring by updating information on field/blocks boundaries and cane status using time series of satellite images. Through the experience conducted on Reunion Island (Indian Ocean) where the sugar industry has difficulty collecting updated localized information on smallholders fields, we show how SPOT satellite images can be interpreted and processed in order to produce thematic maps and statistics. These maps can then be integrated in a Geographic Information System (GIS) designed for decision makers. This on-the-shelf GIS permits one to visualize maps and edit monthly statistics of the management practices in each production area.
8 pages ; International audience ; With the recent development of geospatial technologies, remote sensing data are more and more integrated in the information systems of crop industries. The satellite's ability to collect "snapshots" over large cropped areas at once makes it a unique tool to able it to acquire localized and objective data in real-time.In this paper, we present how this technology can provide reliable information for sugarcane planting and harvest monitoring by updating information on field/blocks boundaries and cane status using time series of satellite images. Through the experience conducted on Reunion Island (Indian Ocean) where the sugar industry has difficulty collecting updated localized information on smallholders fields, we show how SPOT satellite images can be interpreted and processed in order to produce thematic maps and statistics. These maps can then be integrated in a Geographic Information System (GIS) designed for decision makers. This on-the-shelf GIS permits one to visualize maps and edit monthly statistics of the management practices in each production area.
