Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis
Leptospirosis, an environmental infectious disease of bacterial origin, is the infectious disease with the highest associated mortality in Seychelles. In small island territories, the occurrence of the disease is spatially heterogeneous and a better understanding of the environmental factors that co...
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ftird:oai:ird.fr:fdi:010080650 2023-05-15T18:04:57+02:00 Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis Biscornet, L. Revillion, C. Jego, Sylvaine Lagadec, E. Gomard, Y. Le Minter, G. Rocamora, G. Guernier-Cambert, V. Melade, J. Dellagi, K. Tortosa, P. Herbreteau, Vincent SEYCHELLES MAHE 2021 text/pdf http://www.documentation.ird.fr/hor/fdi:010080650 EN eng http://www.documentation.ird.fr/hor/fdi:010080650 oai:ird.fr:fdi:010080650 Biscornet L., Revillion C., Jego Sylvaine, Lagadec E., Gomard Y., Le Minter G., Rocamora G., Guernier-Cambert V., Melade J., Dellagi K., Tortosa P., Herbreteau Vincent. Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis. Remote Sensing, 2021, 13 (2), p. 325 [19 p.]. leptospirosis rodents Rattus rattus Rattus norvegicus spatial analysis remote sensing landscape metrics satellite ecology text 2021 ftird 2021-03-16T23:52:11Z Leptospirosis, an environmental infectious disease of bacterial origin, is the infectious disease with the highest associated mortality in Seychelles. In small island territories, the occurrence of the disease is spatially heterogeneous and a better understanding of the environmental factors that contribute to the presence of the bacteria would help implement targeted control. The present study aimed at identifying the main environmental parameters correlated with animal reservoirs distribution and Leptospira infection in order to delineate habitats with highest prevalence. We used a previously published dataset produced from a large collection of rodents trapped during the dry and wet seasons in most habitats of Mahe, the main island of Seychelles. A land use/land cover analysis was realized in order to describe the various environments using SPOT-5 images by remote sensing (object-based image analysis). At each sampling site, landscape indices were calculated and combined with other geographical parameters together with rainfall records to be used in a multivariate statistical analysis. Several environmental factors were found to be associated with the carriage of leptospires in Rattus rattus and Rattus norvegicus, namely low elevations, fragmented landscapes, the proximity of urbanized areas, an increased distance from forests and, above all, increased precipitation in the three months preceding trapping. The analysis indicated that Leptospira renal carriage could be predicted using the species identification and a description of landscape fragmentation and rainfall, with infection prevalence being positively correlated with these two environmental variables. This model may help decision makers in implementing policies affecting urban landscapes and/or in balancing conservation efforts when designing pest control strategies that should also aim at reducing human contact with Leptospira-laden rats while limiting their impact on the autochthonous fauna. Text Rattus rattus IRD (Institute de recherche pour le développement): Horizon Main Island ENVELOPE(-38.220,-38.220,-54.007,-54.007) |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
topic |
leptospirosis rodents Rattus rattus Rattus norvegicus spatial analysis remote sensing landscape metrics satellite ecology |
spellingShingle |
leptospirosis rodents Rattus rattus Rattus norvegicus spatial analysis remote sensing landscape metrics satellite ecology Biscornet, L. Revillion, C. Jego, Sylvaine Lagadec, E. Gomard, Y. Le Minter, G. Rocamora, G. Guernier-Cambert, V. Melade, J. Dellagi, K. Tortosa, P. Herbreteau, Vincent Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
topic_facet |
leptospirosis rodents Rattus rattus Rattus norvegicus spatial analysis remote sensing landscape metrics satellite ecology |
description |
Leptospirosis, an environmental infectious disease of bacterial origin, is the infectious disease with the highest associated mortality in Seychelles. In small island territories, the occurrence of the disease is spatially heterogeneous and a better understanding of the environmental factors that contribute to the presence of the bacteria would help implement targeted control. The present study aimed at identifying the main environmental parameters correlated with animal reservoirs distribution and Leptospira infection in order to delineate habitats with highest prevalence. We used a previously published dataset produced from a large collection of rodents trapped during the dry and wet seasons in most habitats of Mahe, the main island of Seychelles. A land use/land cover analysis was realized in order to describe the various environments using SPOT-5 images by remote sensing (object-based image analysis). At each sampling site, landscape indices were calculated and combined with other geographical parameters together with rainfall records to be used in a multivariate statistical analysis. Several environmental factors were found to be associated with the carriage of leptospires in Rattus rattus and Rattus norvegicus, namely low elevations, fragmented landscapes, the proximity of urbanized areas, an increased distance from forests and, above all, increased precipitation in the three months preceding trapping. The analysis indicated that Leptospira renal carriage could be predicted using the species identification and a description of landscape fragmentation and rainfall, with infection prevalence being positively correlated with these two environmental variables. This model may help decision makers in implementing policies affecting urban landscapes and/or in balancing conservation efforts when designing pest control strategies that should also aim at reducing human contact with Leptospira-laden rats while limiting their impact on the autochthonous fauna. |
format |
Text |
author |
Biscornet, L. Revillion, C. Jego, Sylvaine Lagadec, E. Gomard, Y. Le Minter, G. Rocamora, G. Guernier-Cambert, V. Melade, J. Dellagi, K. Tortosa, P. Herbreteau, Vincent |
author_facet |
Biscornet, L. Revillion, C. Jego, Sylvaine Lagadec, E. Gomard, Y. Le Minter, G. Rocamora, G. Guernier-Cambert, V. Melade, J. Dellagi, K. Tortosa, P. Herbreteau, Vincent |
author_sort |
Biscornet, L. |
title |
Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
title_short |
Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
title_full |
Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
title_fullStr |
Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
title_full_unstemmed |
Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
title_sort |
predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis |
publishDate |
2021 |
url |
http://www.documentation.ird.fr/hor/fdi:010080650 |
op_coverage |
SEYCHELLES MAHE |
long_lat |
ENVELOPE(-38.220,-38.220,-54.007,-54.007) |
geographic |
Main Island |
geographic_facet |
Main Island |
genre |
Rattus rattus |
genre_facet |
Rattus rattus |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010080650 oai:ird.fr:fdi:010080650 Biscornet L., Revillion C., Jego Sylvaine, Lagadec E., Gomard Y., Le Minter G., Rocamora G., Guernier-Cambert V., Melade J., Dellagi K., Tortosa P., Herbreteau Vincent. Predicting the presence of leptospires in rodents from environmental indicators opens up opportunities for environmental monitoring of human leptospirosis. Remote Sensing, 2021, 13 (2), p. 325 [19 p.]. |
_version_ |
1766176372637564928 |