We have just been sent this update on the Grey Plover tracking project from Grace Maglio (full team listed at the end of the post). This is going to be very interesting, can't wait to see what unfolds.
Grey
Plover Satellite transmitters update
Broome
birds
They’re off!! After 8 weeks of fattening up
on Roebuck Bay, at Broome in northwest Australia, the first of the Grey Plovers
which were given satellite transmitters in February has now set off on northward migration (see
map). These transmitter deployments were carried out by the Australasian Wader
Studies Group (AWSG) Wader and Tern Expedition 2016.
This first Grey Plover (Ecosure, LLA) left
Broome on the evening of Wednesday 6th April and touched down on the mainland coast of
China on Monday 11th April, about 600 kms south of Shanghai, after a
non-stop flight of 4,700 kms in around four and a half days. Its average over
ground/sea flight speed of around 44kph was similar to that recorded (by
geolocators) on other species of waders on this leg of their northern
migration. This suggests that the bird probably experienced satisfactory wind
conditions throughout its flight. It is now likely to rest for a few days
before moving up the Chinese coast into the Yellow Sea.
Since the deployment of the transmitters on
21st February and the initial communique on this project in late
February we have received position downloads by satellite every two and a half
days. These have shown that four of the birds have largely remained close to
the area where they were originally caught near Crab Creek in the northeast
corner of Roebuck Bay. They have ranged over the mud flats at low tide,
sometimes to the outermost extent of these – 3 kms from the beaches and
mangroves on the upper shores of the Bay (see map). At high tide they have
roosted on the upper mud flats, on the nearby sandy beaches or – on the highest
Spring tides- in the salt pans on the saltmarsh almost 2 kms inland (see map). Occasionally
they made sorties further afield, down towards Bush Point (see map). The
transmitter on the fifth bird did not send out any signals after the initial
transmission, for reasons unknown (loss of harness attachment, predation,??).
The four birds have been named Ecosure,
Nad, Mymi and Charlie in response to requests from some of the major financial
sponsors. The link to their transmitter numbers and their engraved flags is
shown in the following Table.
Leg Flag
|
Transmitter ID
|
Name
|
LLH
|
154189
|
Mymi
|
LLJ
|
154191
|
Nad
|
LLA
|
154188
|
Ecosure
|
LLK
|
154192
|
Charlie
|
Three of the four birds have been seen,
mostly several times, by flag scanners and birdwatchers on Roebuck Bay over the
past 2 months (see attached photo of LLK (Charlie)). LLA (Ecosure) was even seen
on the Bay on the morning of the day before it set off on migration to China!
You can follow these birds on the Birdlife
Australia website: http://birdlife.org.au/campaigns/the-marvel-of-migration
South
Australia birds
Two satellite transmitters were also
deployed on Grey Plovers at Thompsons Beach, 50kms north of Adelaide, in
November 2015. These were put on by Friends of Shorebirds SE (FoSSE), in
collaboration with the Victorian Wader Study Group (VWSG).These two birds have been
regularly tracked in subsequent weeks as they fed on the extensive mud flats on
the shore and occasionally adjourned to adjacent saltmarsh areas, mainly for
night-time high tide roosting. They were occasionally seen and photographed in
this period (see photo).
Grey Plover LLK (Charlie) carrying satellite transmitter on Roebuck Bay. Photo: Grace Maglio |
Grey Plover CYA carrying satellite transmitter at Thompsons Beach. Photo: Peter Owen. |
The
second bird (CYB) departed 10 days later, on 24th March, and flew
non-stop 7,200kms to the China coast in five and a half days. The approximate
travel speeds over the ground/ sea of these two birds were 57 and 55kph
respectively. After an 11 day and 5 day
’rest’ respectively both birds have
subsequently moved on to locations further up the China coast, with one bird
now being on the shores of the Yellow Sea on the southern side of Bohai Bay and
the other being just north of Shanghai (see map).
Questions
It is really exciting that we now have on
migration Grey Plovers carrying satellite transmitters put on in two different
parts of Australia 2,800kms apart.
Clearly the birds from the more southerly
non-breeding area have set off on northward migration first – because they have
much further to travel to the presumed breeding grounds in northern Siberia (or
Alaska?). It will be interesting to see what other differences emerge between the
two populations or whether their migration routes and timing gradually merge.
Also will they breed in the same, or different, areas? And, will there be
similar temporal differences in their southward migration?
Hopefully the answers will gradually emerge
over coming weeks and months. But do be prepared for periods of ‘no news’ when
birds are stationary at stopover locations or on their high Arctic breeding
grounds. Also be prepared for ‘losses’ – there are plenty of predators looking
for a meal from vulnerable migrants and in the barren Arctic tundras. We are
also dependent on the vagaries of electronic technology, built to a micro
lightweight scale, plus our own skills at constructing a harness mechanism to
hold the unit on the birds’ back in a position where the rechargeable solar
batteries can operate successfully.
Watch this space!
Thanks
The AWSG and FoSSE/ VWSG are extremely
grateful to the generous people and organisations who have provided the funds
for this project. Each satellite transmitter costs around $5,000 and satellite download
costs of up to $2,500 can be incurred for each unit (depending on the life of
the transmitter). The major funding for the transmitters deployed in northwest
Australia by the AWSG derived from a crowd-funding project organised by
Birdlife Australia earlier this year. Further financial contributions came from
the annual northwest Australia expeditions themselves and from another
individual major donor.
The South Australia project was mainly
funded through generous contributions from the Adelaide and Mount Lofty Ranges
Natural Resources Management Board and the Australian Government-funded
Samphire Coast icon project.
These projects would not have been possible
without the fieldwork efforts of the AWSG NWA2016 Expedition and members of FoSSE/
VWSG.
Clive Minton
Ken Gosbell
Chris Hassell
Maureen
Christie
Katherine
Leung
Grace Maglio
Inka Veltheim
13 April, 2016
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