Abstract
Abstract In recent years, anthropogenic conversion of grassland habitat has raised concerns about the status of breeding Swainson's Hawks (Buteo swainsoni) in the northern Great Plains region of North America. During 2013–2014, we captured breeding Swainson's Hawks in north-central South Dakota and south-central North Dakota to estimate home-range size, determine adult survival rates during the breeding season, and evaluate habitat selection. We captured, radio-tagged, and monitored 13 Swainson's Hawks in 2013, and captured two additional Swainson's Hawks in 2014. In 2014, seven of 13 individuals initially captured in 2013 returned to the same breeding territory for the 2014 breeding season. Average 95% MCP home-range size in 2013 was 205.4 ha (SD = 135.3 ha, n = 10) and 211.1 ha (SD = 208.8 ha, n = 9) in 2014, and size did not differ between years (t13 = 0.07, P = 0.95), averaging 208.3 ha (SD = 244.9 ha, n = 19 home ranges measured for 12 birds) for the 2 yr of the study. Mean core home-range size (50% ...
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