Climate and urbanization drive changes in the habitat suitability of Schistosoma mansoni competent snails in Brazil
Glidden, C. K.; Singleton, A. L.; Chamberlin, A.; Tuan, R.; Palasio, R. G. S.; Calderia, R.; Monteiro, A. M. V.; Lwiza, K. M.; Liu, P.; Silva, V.; Athni, T. S.; Sokolow, S. H.; Mordecai, E. A.; De Leo, G. A.
Show abstract
Schistosomiasis is a neglected tropical disease caused by Schistosoma parasites. Schistosoma are obligate parasites of freshwater Biomphalaria snails, so controlling snail populations is critical to reducing transmission risk. As snails are sensitive to environmental conditions, we expect their distribution is significantly impacted by global change. Here, we leveraged machine learning, remote sensing, and 30 years of snail occurrence records to map the historical and current distribution of competent Biomphalaria throughout Brazil. We identified key features influencing the distribution of suitable habitat and determined how Biomphalaria habitat has changed with climate and urbanization over the last three decades. Our models show that climate change has driven broad shifts in snail host range, whereas expansion of urban and peri-urban areas has driven localized increases in habitat suitability. Elucidating change in Biomphalaria distribution - while accounting for non-linearities that are difficult to detect from local case studies - can help inform schistosomiasis control strategies.
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