Update on the Aransas Wood Buffalo Population of Whooping Cranes
The Unison Call – Vol. 27 No. 1
Breeding pair surveys in May detected 78 nests (an additional nest was inferred based on observation of a pair with offspring during August surveys), 15 of which were outside the area designated as critical habitat and seven of which were outside Wood Buffalo National Park; 18 pairs without nests were also observed. Surveys in August detected 45 juveniles; 43 pairs had one juvenile each and one pair had two juveniles. Annual productivity was 0.57 juveniles per nest, well above than the 20-year average of 0.48 but within the long-term natural range of variation.
The above are preliminary results from the Canadian Wildlife Service, contributed by Mark Bidwell.
Summary of Aransas Wood Buffalo Population Breeding Surveys for 2013-2016
Aransas NWR winter counts are from ‘Whooping Crane Updates’ at the ANWR website. ‡Estimated numbers of birds outside the primary survey area in 2013, 2014, and 2015 were 6, 6, and 9, respectively. (95% CI means 95% confidence interval) — Ed.
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