Abstract During their annual migrations between breeding and nonbreeding grounds, Calidris canutus rufa (Red Knot) use two major stopover regions along the Brazilian coast: one in the north and another in the south. Based on remote tracking data from 2023 and 2024 we estimate home-range size, daily displacement, and spatial distribution at these stopover regions. Mean home-range size (95% utilization distribution, UD) was 3,242 km2 (CI: 0–6,520) in the north and 5,514 km2 (CI: 1,528–9,499) in the south, and core areas (50% UD) showed a similar pattern, indicating generally smaller space use in the north with a high overlap of home range in the south. Daily displacement was highly variable among the 22 tracked individuals but did not differ consistently between stopovers. Home-range sizes during stopovers in Brazil exceeded those previously reported for this species and for other migratory shorebirds. Calidris canutus rufa predominantly occupied intertidal beach zones at both stopovers. These results highlight contrasting ecological conditions between stopover regions and emphasize the importance of both areas for the conservation of C. canutus rufa and other migratory shorebirds.
Brum et al. (Thu,) studied this question.
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