Net change in abundance across the North American avifauna, 1970-2017

Range Table - link
Organism Biosphere
Reference Rosenberg KV et al., Decline of the North American avifauna, Science 19 Sep 2019: eaaw1313 DOI: 10.1126/science.aaw1313 table 1
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." See note above table
Comments 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)." P.2 left column top paragraph: "Across breeding biomes, grassland birds showed the largest magnitude of total population loss since 1970—more than 700 million breeding individuals across 31 species— and the largest proportional loss (53%): 74% of grassland species are declining. (Fig. 1 and Table 1). All forest biomes experienced large avian loss, with a cumulative reduction of more than 1 billion birds. Wetland birds represent the only biome to show an overall net gain in numbers (13%), led by a 56% increase in waterfowl populations (Fig. 3 and Table 1). Surprisingly, [investigators] also found a large net loss (63%) across 10 introduced species (Fig. 3, D and E, and Table 1)."
Entered by Ron Milo - Admin
ID 117282