Study site

AA Alexandra M. Anderson
CF Christian Friis
CG Cheri L. Gratto-Trevor
CH Christopher M. Harris
OL Oliver P. Love
RM R. I. Guy Morrison
SP Sean W. J. Prosser
EN Erica Nol
PS Paul A. Smith
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We studied shorebirds along the southwestern coast of James Bay, Ontario, Canada (Fig. 1) during two time periods: 1974–1982 (see also Gratto 1983; Harrington and Morrison 1979; Morrison 1984) and 2014–2018, hereafter referred to as “historical” and “present-day”, respectively. This northern stopover site supports hundreds of thousands of shorebirds during southbound migration and is one of the first stopover sites used by shorebirds that breed in the eastern and central Canadian Arctic (Morrison 1984; McKellar et al. 2020). The study area is within the Hudson Bay Lowlands and consists of wide intertidal flats and coastal marshes bordered by the seasonally ice-covered waters of James Bay to the east and the boreal forest to the west.

a Locations of Motus Wildlife Tracking System automated radio towers in 2016 and/or 2017. Darker points indicate multiple towers situated close together. b Radio towers along James Bay, Ontario, Canada. Labelled points designate field sites. Study species: c semipalmated sandpiper, d white-rumped sandpiper, e least sandpiper, f pectoral sandpiper, g semipalmated plover

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