Decrease in bird population size in North America since 1970

Value 29 %
Organism Biosphere
Reference Rosenberg KV et al., Decline of the North American avifauna, Science 19 Sep 2019: eaaw1313 DOI: 10.1126/science.aaw1313 abstract and p.1 right column 2nd paragraph
Method Abstract: "Using multiple and independent monitoring networks, [investigators] report population losses across much of the North American avifauna over 48 years, including once common species and from most biomes."
Comments Abstract: "Integration of range-wide population trajectories and size estimates indicates a net loss approaching 3 billion birds, or 29% of 1970 abundance." P.1 right column 2nd paragraph: "Results from long-term surveys, accounting for both increasing and declining species, reveal a net loss in total abundance of 2.9 billion (95% CI = 2.7-3.1 billion) birds across almost all biomes, a reduction of 29% (95% CI = 27-30%) since 1970 (Fig. 1 and Table 1)."
Entered by Ron Milo - Admin
ID 117279