| 翻訳と辞書 |
Ladoga seal
The Ladoga ringed seal ((ロシア語:Ладожская нерпа); ''Pusa hispida ladogensis''), is a freshwater subspecies of the ringed seal (''Pusa hispida'') which are found entirely in Lake Ladoga in northwestern Russia. The subspecies evolved during the last ice age, about 11,000 years ago. As the glaciers retreated and water levels changed, the Baltic ringed seal (including Ladoga seals) was trapped in freshwater lakes and separated from the Arctic ringed seal.
It is related to the even smaller population of Saimaa ringed seals in Lake Saimaa, a lake that flows into Ladoga through the Vuoksi River.
==Appearance==
The adult Ladoga seal grows to about 150 cm in length and weighs approximately 60-70 kg. Pups are approximately 50-60 cm at birth and weigh approximately 4-5 kg. There are four variations of coats.〔Popov, L. "Ladoga Seal." ''Mammals in the Seas, volume II: pinniped species summaries and report on sirenians'' (FAO Fisheries Series) No. 5, Vol II, pp. 70–71〕 About 47% of Ladoga seals have a dark brown coat with lighter ring shaped patterns, 29% have a dark brown coat with lighter vein-like patterns, and 17% have a light brown coat with a dark dorsal belt as well as faint rings and spots. The coats of the remaining 7% are not described by Popov. Annual molting takes place from April through June.
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「Ladoga seal」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.
|
|