Deep snow had a positive link to recorded bird richness in three of four North American feeder samples in 2001-2005 and 2021-2024
We tested the link between deep snow and recorded bird richness at feeding sites. We used 126,232 checklists from selected site-winters in eastern and western North America in 2001-2005 and 2021-2024. Each site-winter had at least two reports of no snow and two reports of more than 15 cm of snow. Models removed site-winter and state or province by year-week effects. They controlled reported effort. The four-test intervals were above zero in 3 samples and below zero in 0 samples. The estimates describe recorded species at feeders. Temperature, feeder changes, observer changes and detection can affect the results. This study does not measure population gain, pollution effects or a cause of climate change.
snow · birds · FeederWatch · observation bias · recorded richness · regional replication
References
10- doi:10.3389/fevo.2021.619682
- doi:10.1111/j.1365-2656.2010.01780.x
- doi:10.1111/jbi.14326
- https://feederwatch.org/explore/raw-dataset-requests/
- https://docs.ropensci.org/PFW/reference/pfw_dictionary.html
- useshttps://cdn.feederwatch.org/data/202406/PFW_spp_translation_table_May2024.csv
Use this fixed public May 2024 snapshot. Exact bytes are checked against the recorded SHA-256 hash.
- useshttps://cdn.feederwatch.org/data/202406/PFW_all_2001_2005_May2024_Public.csv.zip
Use this fixed public May 2024 snapshot. Exact bytes are checked against the recorded SHA-256 hash.
- useshttps://cdn.feederwatch.org/data/202406/PFW_all_2021_2024_May2024_Public.csv.zip
Use this fixed public May 2024 snapshot. Exact bytes are checked against the recorded SHA-256 hash.
- reviewsNo matched US bird survey had both a start at 25 C or more and PM2.5 above 35 ug/m3 in 2006-2024 sci:sha256:507e7e28613306aef40ff76e101ae5ed83ec9fd855ea89678d30e66f3186c3b6
Review the exposure-support limit in another bird survey program. No data or code are reused.
- reviewshttps://feederwatch.org/detailed-instructions/record-effort-weather-data/
Current instructions describe average snow cover over the site and count period. This differs from the short field definition.
Cited by
1 publicationPublic catalog entries on Sciscape.
- usesDeep snow had larger report contrasts for ground than tree bird pools in eastern feeder samples in 2001-2005 and 2021-2024
We use its public checklist rules, changing-snow selection, fixed-effect design, and cluster-error approach. We add source-defined foraging pools, daily temperature, and paired group outcomes.