Point count offsets for estimating population sizes of north American landbirds

By: , and 



Bird monitoring in North America over several decades has generated many open databases, housing millions of structured and semi-structured bird observations. These provide the opportunity to estimate bird densities and population sizes, once variation in factors such as underlying field methods, timing, land cover, proximity to roads, and uneven spatial coverage are accounted for. To facilitate integration across databases, we introduce NA-POPS: Point Count Offsets for Population Sizes of North American Landbirds. NA-POPS is a large-scale, multi-agency project providing an open-source database of detectability functions for all North American landbirds. These detectability functions allow the integration of data from across disparate survey methods using the QPAD approach, which considers the probability of detection (q) and availability (p) of birds in relation to area (a) and density (d). To date, NA-POPS has compiled over 7.1 million data points spanning 292 projects from across North America, and produced detectability functions for 338 landbird species. Here, we describe the methods used to curate these data and generate these detectability functions, as well as the open-access nature of the resulting database.

Publication type Article
Publication Subtype Journal Article
Title Point count offsets for estimating population sizes of north American landbirds
Series title Ibis
DOI 10.1111/ibi.13169
Volume 165
Issue 2
Year Published 2023
Language English
Publisher Wiley
Contributing office(s) Alaska Science Center Ecosystems
Description 22 p.
First page 482
Last page 503
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