504 Wild Whooping Cranes Estimated at ANWR this past winter
U.S. Fish and Wildlife Service biologists have completed analysis of last winter’s aerial surveys of the Aransas-Wood Buffalo whooping crane population. “Preliminary data analysis indicated 504 whooping cranes, including 13 juveniles, in the primary survey area (approximately 153,950 acres) centered on Aransas National Wildlife Refuge near Austwell, Texas.
This is comparable with the prior winter’s estimate of 505 whooping cranes, indicating the population remained stable but did not experience the growth this year that it has the past several years. An additional 12 birds were noted outside the primary survey area during the survey. This marks the 2nd year in a row that the population has topped the 500 mark. The lack of population growth last winter likely resulted from a low chick production season on the breeding grounds of northern Canada during the spring-summer of 2018.”
Delay in Whooping Crane survey
During winter 2018–2019, the U.S. Fish and Wildlife Service continued to use a Quest Kodiak aircraft and surveys were conducted in mid-February. The primary survey area (approximately 153,950 acres; Figure 1) was surveyed multiple times during February 9–14, 2019. San Jose Island, West Marsh, Lamar-Tatton, Matagorda Island Central, and Welder Flats-Dewberry were surveyed 4 times and Blackjack was surveyed 5 times. Due to logistical constrains and poor weather conditions, the secondary survey areas (approximately 169,300 acres; Figure 1) were not surveyed this winter. Due to unforeseen circumstances, the U.S. Fish and Wildlife Service conducted the survey later than planned which likely resulted in underestimates of recruitment due to late season changes in plumage coloration.
No growth this year for Whooping Crane Population
The long-term growth rate in the whooping crane population has averaged 4.5% (n = 95; 95% CI = 1.77– 6.98%). The population remained stable from winter 2017–2018 to winter 2018–2019 In summer 2018, the Canadian Wildlife Service reported 24 whooping crane chicks were fledged at Wood-Buffalo Nation Park which is lower than normal. Recruitment was low resulting in no population growth.
You can see the full report at the following link:
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