The Whooping Crane (Grus americana) is one of North America’s most endangered species. There is only one wild, self-sustaining migratory population of Whooping Cranes, the Aransas–Wood Buffalo population (AWBP). The birds of the AWBP migrate 4,000 km twice each year between their nesting grounds in northern Canada and their wintering grounds on the Texas Gulf Coast. During migration, AWBP Whooping Cranes must land at suitable ponds or wetlands to forage, rest or roost. The Whooping Crane Recovery Plan, developed by federal wildlife agencies in Canada and the USA, calls for the protection and management of Whooping Crane stopover locations within the migration corridor. Although major stopover areas have been protected, many other smaller sites remain to be identified. However, the Recovery Plan offers no specific entity to identify, protect and manage the latter. To address these deficiencies in information and activity, Friends of the Wild Whoopers partnered with the United States Army Corps of Engineers (USACE) within the AWBP migration corridor to share information about Whooping Cranes and their habitat needs and identify potential stopover locations on USACE properties that could be protected and managed for cranes. This partnership identified 624 potential stopover sites on 34 USACE lakes, principally in North and South Dakota, Nebraska, Kansas, Oklahoma and Texas, with commitments to manage the habitats as resources allow.
Estimated Texas Wintering Whooping Crane Population Breaks 500
Survey accuracy improved with shift from December to February timeframe
The first winter after Hurricane Harvey ravaged the Texas Gulf Coast, an estimated 505 whooping cranes arrived on their Texas wintering grounds after migrating 2,500 miles from their breeding grounds in Wood Buffalo National Park in Canada. Each fall the birds make their way back to Aransas National Wildlife Refuge and surrounding habitats, where they spend the winter. Once they have arrived, wildlife biologists with the U.S. Fish and Wildlife Service survey the birds by air and analyze population trends.
Biologists have completed analysis of aerial surveys of the Aransas-Wood Buffalo whooping crane population done last winter. A switch in aircraft the previous winter and a shift to surveying later in the winter when a larger proportion of the population had arrived helped improve accuracy of the counts. Preliminary data analysis indicated 505 whooping cranes, including 49 juveniles, in the primary survey area (approximately 153,950 acres) centered on Aransas National Wildlife Refuge near Austwell, Texas. An additional 21 birds were noted outside the primary survey area during the survey. This marks the 6th year in a row that the population has increased in size and the first time the population has topped the 500 mark.
“Breaking the 500 mark for this wild population is a huge milestone”, stated Amy Lueders, the Service’s Southwest Regional Director. “Seeing this iconic bird continue to expand demonstrates how the Endangered Species Act can help a species recover from the brink of extinction. I have to credit our biologists and our partners and local communities who continue to invest so much time and effort to improve our ability to make sure future generations have the chance to marvel at the beauty of these amazing wild birds.”
The U.S. Fish and Wildlife Service has implemented several small changes that have greatly improved the agency’s capacity to survey the birds. “After two years of testing a shift of our December survey timeframe to later in the winter, we believe our previous survey estimates were likely low given that not all the whooping cranes had completed migration by mid-December. We had indications of a later than expected fall migration over the last several years via migration reports and telemetry data. This is the first year that we have based our winter abundance estimate from a February survey timeframe rather than a December timeframe. It may seem like population numbers jumped more than usual, but in reality we are just capturing a more complete proportion of the population, with most birds having completed migration by early February” stated U.S. Fish and Wildlife Service Whooping Crane Coordinator Wade Harrell.
Harrell said biologists will continue to conduct flights in late January and early February for future surveys. He also stated that staff at Aransas National Wildlife Refuge continue to make progress in recovering from the impacts of Hurricane Harvey. “The good news is that the coastal marsh that supports our wintering whooping cranes was not significantly damaged by the hurricane and recovered quickly from any impacts, demonstrating how resilient intact wetland habitats can be.”
Whooping cranes are one of the rarest birds in North America and are highly endangered. Cranes have been documented to live more than 30 years in the wild. Adults generally reach reproductive age at four or five years, and then lay two eggs, usually rearing only one chick.
More information about the survey and whooping cranes can be found on the Aransas National Wildlife Refuge website at http://www.fws.gov/refuge/Aransas/ or by calling the Aransas National Wildlife Refuge Visitor Contact Station at: (361) 349-1181.
To read an in depth report of the survey results in PDF format, click here.
The mission of the U.S. Fish and Wildlife Service is working with others to conserve, protect, and enhance fish, wildlife, plants, and their habitats for the continuing benefit of the American people. We are both a leader and trusted partner in fish and wildlife conservation, known for our scientific excellence, stewardship of lands and natural resources, dedicated professionals, and commitment to public service.
This past summer in Wood Buffalo National Park, (WBNP), ten juvenile whooping cranes were trapped and fitted with solar-powered Cellular Tracking Platforms, (CTPs). Last month, the U.S. Fish and Wildlife Service and U.S. Geological Survey biologists trapped and banded 7 more cranes on their wintering grounds at Aransas National Wildlife Refuge, (ANWR).
The new CTPs worn by the banded cranes will collect precise location data every half-hour, resulting in 48 data points collected daily. When the bird is within range of a cellular tower, location data points are transmitted to biologists who will use the information to track migration routes, stopover locations, and habitat use on the breeding grounds at WBNP and wintering grounds at ANWR. Biologists will a have better understanding of what habitat the whooping cranes prefer. All this will help wildlife agencies, and landowners to better manage coastal prairies and wetlands for whooping cranes and other resident wildlife.
To read more about this project, CTPs, and the procedure for capturing and banding the whooping cranes in this project, click here.
***** FOTWW’s mission is to help preserve and protect the Aransas/Wood Buffalo
population of wild whooping cranes and their habitat. ***** Friends of the Wild Whoopers is a nonprofit 501(c)3 organization.
Wade Harrell, U.S. Whooping Crane Recovery Coordinator
Wintering Whooping Crane Update
Fall migration is coming to a close and whooping cranes have all moved south out of their breeding grounds in Wood Buffalo National Park (WBNP). It was a record breeding year in WBNP; with above average conditions contributing to an estimated 63 fledged whooping cranes headed South on their first migration to Texas. The Whooping Crane migration from Wood Buffalo to Aransas is about 2,500 miles in length and can take up to about 50 days to complete. It will probably be a few more weeks until the entire Aransas Wood Buffalo whooping crane population has arrived on the Texas coast. We were able to fit a few whooping crane juveniles this August in WBNP with new cellular-based telemetry equipment, and I want to walk you through the fall migration of one of these juveniles and its parents.
First off, let me provide a bit of information about our new telemetry devices. In our former telemetry study, we used satellite-based telemetry. These devices provided 3-5 locations every 24 hours and communicated that via space satellite. Our new telemetry devices have the capability to provide significantly more data compared to our previously used devices. We are now using cellular-based telemetry devices, meaning they relay location data using ground-based cellular towers, just like your mobile phone does. The device is powered by a solar-charged battery. As long as the marked bird is in the range of a cellular tower, we receive a data download every day via internet. Each data download contains locations for the bird every 30 minutes over the past 24 hours. The new telemetry devices are also equipped with what is called an accelerometer, meaning we can determine the speed of the bird, indicating if it is in flight or on the ground.
The journey of “7A”, fall 2017 migration:
On 2 August, a team of biologist captured and marked a 3 month old whooping crane in Wood Buffalo National Park, around the nest where he was hatched about 60 miles south of the Great Slave Lake, and fitted him with one of our new cellular-based telemetry units (identified as “7A”). This young whooping crane and his parents left their breeding area the morning of 26 September, to start on their long journey south.
On the first night away from their nesting area, 7A and his family roosted on Gipsy Lake, 35 miles SE of Fort McMurray, AB. The next morning (27 September) the family traveled to Witchekan Lake near Spiritwood, SK and spent the night. On the morning of 28 September, they traveled to their “staging ground” area, the prairie pothole region of Central Saskatchewan. They spent the next month foraging on waste grains in the agricultural areas and in wetlands around Prud’ Homme, SK. After a strong frontal passage bringing northerly winds and colder weather, they proceeded south on the morning of 29 October.
They crossed the Canada/United States border around mid-day near the NW corner of North Dakota and spent that night on the banks of the Missouri River about 20 miles SE of Bismarck, North Dakota. The next morning, 30 October, they continued south, roughly following the Missouri River as it winds through South Dakota. With a strong tailwind, they were able to cross South Dakota in about 3 hours, without stopping. They continued through Nebraska that day, crossing the Platte River just east of Gibbon, Nebraska. They did not stop in Nebraska either, traversing the state in about 4 hours. That evening they arrived at Cheyenne Bottoms Wildlife Area in Central Kansas, known as the largest interior wetland in the United States. This is a well-known and established migration stopover habitat location for not only whooping cranes, but a number of other migratory bird species. The next afternoon, on 31 October, they traveled about 20 miles south to Quivira National Wildlife Refuge, where they would spend the next 12 days. Quivira NWR received a record amount of migrating whooping crane use this fall, with over 112 individuals reported there, more than 25% of the Aransas-Wood Buffalo population.
They left Quivira NWR on the morning of 12 November and traveled south about 150 miles to an area of native mixed-grass prairie about 3 miles west of Fairview, Oklahoma. They spent 3 days there, leaving on the morning of 15 November and crossing the Texas border mid-day just to the east of Wichita Falls. That night, they roosted on a farm pond in Bosque County in central Texas. The morning of 16 November, the family continued south through Texas, stopping briefly in southern Bastrop County and then northern Gonzales County. Evidently they were disturbed that night as they made several, short nighttime movements just west of Waelder, Texas. Nocturnal flight is fairly rare and relatively unknown for whooping cranes, but our new telemetry devices allows us to observe this behavior. Only a short distance from their winter home, they left the morning of 17 November and headed south. Early that afternoon, they flew over Victoria, just north of Aransas NWR. Shortly thereafter, they made it to the Tatton Unit of Aransas NWR and roosted there along Salt Creek. The next morning, they made a short jump south and set up what looks to be their wintering territory here on Aransas NWR, where they will likely spend most of their time over the next several months.
The “7A” family had a fairly normal fall migration, taking 52 days and a bit over 2,500 miles to complete. You’ll note that the “pit stops” that they made along the way almost always were tied to quality wetland and prairie habitats. Protecting and restoring these types of habitats across the vast Great Plains of North America really is key to making sure whooping crane migrations are successful.
Texas Whooper Watch
Be sure to report any Texas migration sightings via email: email@example.com or phone: (512) 389-TXWWW (8999)
Current conditions at Aransas NWR:
Food & Water Abundance:
You’ve likely seen many of the news articles related to the impacts of Hurricane Harvey on Aransas NWR, so I won’t go into detail here on that topic. But from all appearances, the coastal marsh habitat that whooping cranes rely on here in the winter seem to have held up well to what is a natural disturbance. While the human impact has been significant, natural habitats often quickly recover after this type of event. From a long-term perspective, the freshwater inflows associated with the hurricane’s rain event will improve coastal marsh condition. We’ve seen a number of whooping cranes that have arrived at Aransas NWR foraging successfully in the coastal marsh as they have for eons. We will continue to monitor habitat conditions and whooping crane behavior and adjust our management accordingly.
Long-time volunteers recognized:
I want to take a minute to recognize a few long-time volunteers at Aransas National Wildlife Refuge that really do make a difference for our wildlife and wild places. First off, Ron Smudy, a long-time volunteer at Aransas, will be awarded as the 2017 Coastal Steward by the Coastal Bend Bays Foundation at the annual Environmental Awards banquet on 7 December. Ron has put a great deal of “sweat equity” into Aransas over the years, from mowing, cutting and spraying invasive species to helping our maintenance staff with all sorts of projects. We truly wouldn’t have the Refuge as we know it without folks like Ron. Additionally, I want to recognize Fred and Linda Lanoue, long-time board members of the Friends of Aransas and Matagorda Island Refuge. They will soon be leaving Texas and were honored this past Saturday at a luncheon, thanking them for all their work with environmental causes around the Texas coastal bend. Fred and Linda’s tireless work with the FAMI board help us accomplish worthwhile projects that just wouldn’t be possible otherwise. Unfortunately, both Ron and the Lanoue’s were personally impacted by Hurricane Harvey. Our hearts go out to them as they start new chapters in their lives and we reflect on all the good work they have done at Aransas NWR.