| 翻訳と辞書 |
| Madagascan pochard ： ウィキペディア英語版 |
Madagascan pochard
The Madagascan pochard or Madagascar pochard (''Aythya innotata''; (マダガスカル語:Fotsy maso, Onjo)〔(Avibase )〕) is an extremely rare diving duck of the genus ''Aythya''. Thought to be extinct in the late 1990s, specimens of the species were rediscovered at Lake Matsaborimena in Madagascar in 2006. As of March 2013, the population is around 80 individuals.〔
==Threats and decline==
Based on the accounts written by Webb and Delacour's in the 1920s and 1930s it seemed that the bird was still relatively common at Lake Alaotra. The duck probably started to decline dramatically sometime in the late 1940s or early 1950s. The cause of decline was the introduction of numerous fish species in the lake that killed most of the pochard chicks and damaged nesting sites. Adult birds are also likely to have become victims of introduced fishes. Rice cultivation, cattle grazing on the shores, burning of shore vegetation, introduced mammals (rats), gill-net fishing and hunting are all factors that led to the duck's disappearance from the lake.〔 The last record of multiple birds at Lake Alaotra is from 9 June 1960 when a small flock of about 20 birds was spotted on the lake. Despite the rarity of the species in 1960, a male was shot, and the specimen is now held by the Zoological Museum Amsterdam. There is a very dubious report of a sighting made outside Antananarivo in 1970.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Madagascan pochard」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|