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Researchers from the Victorian Wader Study Group, which includes Deakin University's Professor Marcel Klaassen, have just recaptured a Ruddy Turnstone which has completed a 27,000 km round trip migration for the second time.
This is the first time a wader has been tracked with a geolocator on its complete migration in successive years.
The bird had a one gram light sensor data logger (geolocator) attached to its leg. This device recorded where the bird was each morning and evening. In each year the device was attached to the bird in mid April on a beach at Flinders, Victoria, in southeast Australia.
Ruddy Turnstones are a small wader weighing less than 100 grams and spend the (austral) summer months on many of the beaches around Australia. They are one of the family of waders that migrate huge distances to Siberia in Russia to breed.
Researchers have used these data logging devices over the last two years to find out the key stopover locations which are so important for the birds to refuel on their long journey.
Other members of the study group include Dr Clive Minton, Ken Gosbell and Penny Johns.
“This is a fantastic result for our study group, which is also supported by a fantastic group of volunteers,” Dr Minton said.
“The data retrieved so far shows that the birds generally start their northward migration with an initial nonstop flight of around 7,600km in six days to Taiwan or adjacent regions.
“There they refuel on the tidal flats before moving north to the Yellow Sea and northern China. They then make a flight of over 5,000kms to the breeding grounds in northern Siberia, arriving in the first week of June.
“One of the interesting findings is that after breeding, the return journey shows considerable variation, no two birds following the same route. Some return through Asia while an amazing alternate route has been demonstrated by these new results.
“This is a trans-Pacific route where the bird moves east to the Aleutian Islands off southwest Alaska before making the huge journey across the Pacific, stopping only once or twice before reaching Australia in early December.”
Professor Klaassen, who is the Director of Deakin's Centre for Integrative Ecology, also paid tribute to the many volunteers who make this research possible..
“This is one of the great things about Australia I have found since coming here, these wonderful volunteers who spend days out in the wetlands helping us with our research,” he said.
“There are many marvelous characters among them and to me their stories are nearly as interesting as the data we get from the birds.”
The first record of the turnstone's flight was in 2009 when the bird spent nearly two months in the Aleutians before setting off southward over the Pacific Ocean and making a nonstop flight of 7,800kms to Kirabati (formerly Gilbert Islands), where it stayed for six weeks before making the 5,000km trip back to Flinders, Victoria. In 2010 the same bird undertook a similar incredible journey, this time stopping off in the Marshall Islands and Vanuatu in the Pacific before returning to Australia.
Turnstones live up to 20 years and such a bird following this 27,000 km trans-Pacific route would have flown over 500,000 kilometres in its lifetime.
Scientists from the Australasian Wader Studies Group of Birds Australia and Deakin University are still puzzling over why individual Ruddy Turnstones from the same breeding and non- breeding population should use such widely differing routes for their annual migrations. The study shows the importance of key regions within the flyway. Scientists are concerned about the ability of these and similar birds to cope with the massive habitat changes occurring as a result of large reclamation and urban development projects.