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[Herons] Study: Ringed Little Egret - 研究: 有腳環的小白鷺

Study: Ringed Little Egret - 研究: 有腳環的小白鷺

KFBG and Egret Research Group of HKBWS released a ringed Little Egret at Nam Sang Wai on 17 June 2010. The yellow colour ring of this bird is HA 01 (see photos). The aim of this study is to investigate the home range and movement of local egrets and herons.

Pls kindly report to Captain Wong at captainw @ kfbg. org if you have any sighting of this bird. Or simply leave a message on the forum. Thanks

嘉道理農場暨植物園與香港觀鳥會鷺鳥研究小組在二零一零年六月十七日於南生圍,放回一隻繫有黃色脚環(編号 HA 01)的小白鷺 (見圖)。本研究目的是找出本地鷺鳥的活動及遷移範圍。

若閣下見到這隻小白鷺,煩請電郵本人 (wongcaptain @ yahoo. com)。或者在此討論區留下資料。謝謝。

Captain WONG 黃倫昌







[ Last edited by wcaptain at 31/05/2018 11:10 ]

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HA04的故事

小白鷺HA04原是一隻受了傷的雀鳥。牠在嘉道理農場暨植物園接受治療及康復後,鷺鳥研究小組/鳥會環誌組在2012年5月31日為牠落腳環,並随後在林村放生。

在2015年繁殖期間,鷺鳥研究小組在大埔墟鷺林點算鳥巢數量時,偶然發現HA04及其伴侶正在築巢。該巢位置在鷺林較外圍及較低的地方。小組同寅深慶HA04在放生後能成功找到伴侶並繁殖下一代。

及至本年(2018)繁殖期,鷺鳥研究小組再次在同一位置找到正在築巢中的HA04。雖然我們沒有在2016及17找到HA04,但估計小白鷺偏向重覆使用同一鳥巢,這亦可看解答到一條問題: 鷺林內鳥巢位置分佈是否”論資排輩”(即父母會隨經驗增長,而搬到較有利的地方營巢) 。初步來看就不是”論資排輩”,否則HA04應搬到較安全的核心地方 (又或可能小白鷺認為開揚外圍才是最佳位置) 。當然,我們希望能有多些數據,去支持這想法。

無論如何,祝HA04 今年能喜添新丁。


The story of HA04
HA04 was an injured Little Egret. It was admitted in KFBG in 2012. After recovery, it was ringed by the Egret Research group/bird ringing group of HKBWS on 31 may 2012, and was subsequently released at Lam Tsuen.

During egretry count of the 2015 breeding season, HA04 was found building its nest with partner at the Tai Po Market colony. The nest location was rather open and peripheral. The Egret Research Group was gald that HA04 can find a partner and have their offspring.

In this year (2018), HA04 was found building its nest with partner at the same corner again! Although we did not find HA04 in 2016 and 2017 (may be overlooked), it is strongly suspected that the Little Egret prefers using the same nesting location in a colony year after year.

This may address the question of “is the nesting location age related” (ie experienced parents can move to a better, inner place to build their nest, and thus their nest varies each year. Or the best place is the outer edge as it could offer a better view to trace foraging flights of their neighbours). It is obviously not aged related in accordance with the observations on HA04. However, this is still a speculation and hope we could have more data to support it.

Nevertheless, we wish HA04 a successful season

[ Last edited by wcaptain at 31/05/2018 11:12 ]

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2015

20150425083420_IMG_1020-1 by Captain, on Flickr


2018
160A9829 - 2018 by Captain, on Flickr

160A9824 - 2018 by Captain, on Flickr

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HA04 - It was seen at Kwong Fuk Bridge, Tai Po on 30 Dec 2018 by IVY SO

It should be a resident bird at Tai Po

Ivy So 係 2018年12月30日在大埔廣福橋見到HA04。根據此冬天紀錄與及半年前繁殖紀錄,HA04應是大埔區留鳥


IMG-20181231-WA0015 IVY SO by Captain, on Flickr

IMG-20181231-WA0015 IVY SO - 複製 by Captain, on Flickr

(相片由IVY SO 提供)

[ Last edited by wcaptain at 31/12/2018 17:29 ]

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