Journal
SCIENCE
Volume 368, Issue 6489, Pages 417-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax9931
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Funding
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig - German Research Foundation [FZT 118]
- Russian Foundation for Basic Research [19-05-00245]
- NSF [NSF06-20443, 8811906, 9411976, 0080529, 0217774, DEB-0423704, DEB-1633026, DEB-1637685, DEB-1256696, DEB-0832652, DEB-0936498, DEB-1832016, DEB-0620652 DEB-1234162, OCE-9982133, OCE-0620959, OCE-1237140, OCE-1832178]
- Division Of Environmental Biology
- Direct For Biological Sciences [8811906, 0217774] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [0080529] Funding Source: National Science Foundation
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [9411976] Funding Source: National Science Foundation
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Recent case studies showing substantial declines of insect abundances have raised alarm, but how widespread such patterns are remains unclear. We compiled data from 166 long-term surveys of insect assemblages across 1676 sites to investigate trends in insect abundances over time. Overall, we found considerable variation in trends even among adjacent sites but an average decline of terrestrial insect abundance by similar to 9% per decade and an increase of freshwater insect abundance by similar to 11% per decade. Both patterns were largely driven by strong trends in North America and some European regions. We found some associations with potential drivers (e.g., land-use drivers), and trends in protected areas tended to be weaker. Our findings provide a more nuanced view of spatiotemporal patterns of insect abundance trends than previously suggested.
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