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Plasticity in the larval life history of the salamander, Hynobius retardatus, in a permanent pond with abundant spring water in hill areas of eastern Sapporo
http://hdl.handle.net/10659/4196
http://hdl.handle.net/10659/4196b044ea30-5871-473c-9e8c-33c6b0670470
| 名前 / ファイル | ライセンス | アクション |
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Midori_syuuron.pdf (1.4 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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| 公開日 | 2016-03-08 | |||||||
| タイトル | ||||||||
| タイトル | Plasticity in the larval life history of the salamander, Hynobius retardatus, in a permanent pond with abundant spring water in hill areas of eastern Sapporo | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||||
| 資源タイプ | thesis | |||||||
| 著者 |
緑, 卓馬
× 緑, 卓馬
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Variations of larval life histories in the salamander, Hynobius retardatus, have been shown even in the same populations. Larval development is mainly affected by water temperature, but other abiotic factors, as well as biotic factors, are also involved. The salamander larvae were monitored in a permanent pond where there were many overwintered larvae and limited predators. It was revealed that there were four seasonal transition phases of water temperature period (i.e., warming period in spring, the constant high period from summer to autumn, cooling period from autumn to winter, and the low constant period in winter). The range of temperatures was very narrow (between 5 and 11 °C), which was due to abundant groundwater supplied from some spring-fed spots throughout the year and canopy covered from spring to autumn. Many larvae with shortening gills (Sts. 65-67) that had emigrated to land were found, indicating that larvae could emigrate before completion of metamorphosis (St. 68). During the periods from late autumn in 2014 to the next early spring, larvae at St. 64 were found continuously, while larvae after St. 65 were not. It was presumed that a certain critical temperature acts like a threshold of initiating metamorphosis between St. 64 and 65. The critical temperature is expected to be nearly the same but slightly higher than the water temperature at spring-fed spots in winter. Overwintered larvae, which were younger than St. 64, resumed their development in spring and metamorphosed from May to August. Since water temperature in summer was not so high, newly hatched larvae developed slowly, and most of the larvae did not metamorphosed within the year of hatching. Monitoring of the salamander larvae and the water temperature were also performed in a temporary pond near the permanent one. All of the larvae developed during the water temperature was considerably high, and emigrated to the land without wintering. | |||||||
| 書誌情報 | p. 1-43 | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | AM | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||||
| その他のタイトル | ||||||||
| その他のタイトル | 札幌市東部の丘陵地にある湧水が豊富な池におけるエゾサンショウウオ幼生生活史の表現型可塑性 | |||||||
| 資源タイプ | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Thesis | |||||||
| 学位名 | ||||||||
| 学位名 | 酪農学 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関名 | 酪農学園大学 | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2015 | |||||||
