Decline of the North American avifauna
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Machine scores (provisional)
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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- Teacher spread
- 0.221 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
Species extinctions have defined the global biodiversity crisis, but extinction begins with loss in abundance of individuals that can result in compositional and functional changes of ecosystems. Using multiple and independent monitoring networks, we report population losses across much of the North American avifauna over 48 years, including once-common species and from most biomes. Integration of range-wide population trajectories and size estimates indicates a net loss approaching 3 billion birds, or 29% of 1970 abundance. A continent-wide weather radar network also reveals a similarly steep decline in biomass passage of migrating birds over a recent 10-year period. This loss of bird abundance signals an urgent need to address threats to avert future avifaunal collapse and associated loss of ecosystem integrity, function, and services.
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The record
- Venue
- Science
- Topic
- Ecology and Vegetation Dynamics Studies
- Field
- Environmental Science
- Canadian institutions
- Environment and Climate Change Canada
- Funders
- Amazon Web ServicesNational Science Foundation
- Keywords
- Abundance (ecology)BiodiversityExtinction (optical mineralogy)Range (aeronautics)BiomeEcosystemEcologyGeographyPopulationBiomass (ecology)Ecosystem servicesBiologyDemography
- Has abstract in OpenAlex
- yes