期刊
SCIENTIFIC REPORTS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41598-021-83111-5
关键词
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资金
- Agricultural Research Service
- National Institute of Agriculture Research (INIAP), Ecuador
- Agency for International Development of the United States Department of Agriculture
The study suggests that mainland fall armyworm likely enters the Galapagos Islands through trade-assisted transport rather than natural migration. The presence of water in the region poses a significant barrier for moth migration, with human-assisted transport playing a more important role.
The migration of the fall armyworm (Spodoptera frugiperda) is of topical interest because of its recent introduction and rapid dissemination throughout the Eastern Hemisphere. This study compares fall armyworm from island and mainland locations in Ecuador to estimate migration behavior. The Galapagos Islands is a province of Ecuador whose mainland coast lies approximately 1000 km to the west and is the closest major land mass. Air transport modeling indicates that natural migration from the mainland to the Galapagos is unlikely, suggesting that most, if not all, the introgressions of mainland fall armyworm into the Galapagos are occurring through trade-assisted transport in contaminated cargo, which is offloaded at the Galapagos port of entry in San Cristobal island. Haplotype studies are consistent with this limited migration and further show divergence in the fall armyworm from San Cristobal with those from the neighboring island of Santa Cruz despite their close proximity (less than 100 km distance) and favorable winds for inter-island flights. These observations indicate that water poses a significant barrier for moth migration in this region, with human-assisted transport probably playing a more important role than natural migration.
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