去年現身台東 翻石鷸飛回澳洲
更新日期:2010/01/15 04:11
GPS定位存移動路徑
〔記者黃明堂／台東報導〕一隻繫有衛星定位儲存器的遷徙性水鳥翻石鷸去年5月現蹤台東市太平溪，最近已返回澳洲繫放地並被回收，研究者已取下發報器送往英國，進行飛行路線判讀。去年同時繫放的有6隻，已回收4隻，這隻編號「9Y」是飛行途中在台灣被目擊的。
這隻翻石鷸右腳有傳統使用的繫放設備，脛部有橘色足旗編號「9Y」，但左腳則有罕用且首次使用在翻石鷸的GPS衛星定位儲存器，以足旗材料像三明治般包裹固定在脛部，超迷你的GPS設備具有自動定位儲存的功能，這是澳洲的水鳥研究者首次運用在翻石鷸遷徙路線研究上，更是台灣首次發現水鳥帶著衛星定位儲存器過境的紀錄。
東海大學台灣水鳥研究群高級繫放員蔣忠祐表示，澳洲水鳥研究者去年執行新計畫，4月21日為6隻翻石鷸繫上足旗、金屬環等傳統設備，並加繫衛星定位紀錄器，從距台灣8000公里外東南澳野放，希望透過GPS儀器自動定位及紀錄翻石鷸過境路線，取得比傳統足旗觀察更精確路徑。
晶片已送往英國判讀
他說，自去年5月台東鳥友在太平溪發現並拍攝「9Y」後，歷經8個月，澳洲的研究者最近向他通報已成功回收，並取下儲存器裡的晶片送往英國判讀數位資料，如果晶片未受損，將可精確比對出牠的世界旅行路線。
蔣忠祐說，同時繫放且被回收的還有3隻，很可能都是台灣的過客，但只有「9Y」被目擊及拍下過境影像，對澳洲研究者是很寶貴的記錄。
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2010年1月19日 星期二
去年現身台東 翻石鷸飛回澳洲-Yahoo!奇摩新聞
BBC NEWS | Science/Nature | Godwit makes huge Pacific flight
Wellington, New Zealand
It's official - the godwit makes the longest non-stop migratory flight in the world.
E7 - a champion of the avian worldA bird has been tracked from its Southern Hemisphere summertime home in New Zealand to its breeding ground in Alaska - and back again.
The bar-tailed godwit, a female known as E7, landed this past weekend after taking just over eight days to fly 11,500km from Alaska to New Zealand.
Unlike seabirds, which feed and rest on long journeys, godwits just keep going.
The migrant champion was one of 13 satellite-tagged bar-tails (Limosa lapponica baueri) that left New Zealand at the beginning of the year.
Tag bonus
E7 set her first record on the way north, when she flew non-stop for 10,200km (6,340 miles) to Yalu Jiang in China. She then flew a further 5,000km (3,000 miles) to the godwit breeding grounds in Alaska. And on the way back to New Zealand, her tag still working, E7 set another record (7,150 miles).
"We were pretty impressed when she did 10,200km on the way north," says Massey University ecologist Phil Battley. "And the fact that she can now do 11,500km... it's just so far up from what we used to believe 10 years ago when we were thinking a five or 6,000km flight was extremely long. Here we've doubled it," adds the New Zealand coordinator of what is an international study.
For researchers, tracking the second leg of E7's journey was a bonus - her implanted satellite tag kept working well past its expected cut-off date.
"If you're trying to confirm how far birds fly and whether they are making stop-offs, it's only now with the technology being small enough, you can do this remotely. Otherwise we'd still be using educated guess work," Dr Battley says.
And that means the researchers now know that the godwits really are the champions of avian migration. Unlike seabirds, which feed and rest on their long journeys or swifts which feed in flight, the godwits make their long journeys without feeding or drinking.
Plump up
Next year, Dr Battley hopes to implant satellite tags into larger male godwits (this year the males had external satellite tags attached) to check that the male birds follow the same path as the females.
Meantime any chicks E7 would have produced during her two months in Alaska will be getting ready to leave the Yukon Delta in a few weeks as the first young godwits usually arrive in New Zealand early next month.
Scientists now have real data on these long distance fliers"Some might fly down in flocks with adults but other ones will fly down without any adults involved at all which is pretty amazing," says Dr Battley. "They're only two months old and here they are about to fly from Alaska to New Zealand."
And their mum? "She'll be eating lots at the moment and probably resting up; and she'll go back to her main routines. Then, come about February next year or January, she'll start moulting into her breeding plumage and getting fat again.
"Then it will all start again."
The New Zealand godwit tracking effort is part of the broader Pacific Shorebird Migration Program, a joint initiative between the US Geological Survey and PRBO Conservation Science.
via news.bbc.co.uk
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