学習がブルーティスの生殖タイミングに与える影響に関する証拠
Fabrizio Grieco1, Arie J van Noordwijk, Marcel E Visser
1Netherlands Institute of Ecology, Center for Terrestrial Ecology, Post Office Box 40, 6666 ZG Heteren, Netherlands. grieco@cto.nioo.knaw.nl
Science (New York, N.Y.)
|April 6, 2002
まとめ
ブルーティツ 青いティツ
科学分野:
- 行動生態学 行動生態学
- 鳥類生物学 鳥類生物学について
- フェノロジー (Phenology) フェノロジー (Phenology) とは,表象学 (Phenology) に関する学問である.
背景:
- 卵を産むタイミングは,鳥の繁殖の成功に不可欠です.
- 環境要因と以前の経験は,繁殖現象学に影響を与えます.
- 青い胸 (Parus caeruleus) は,毎年同じ場所に繁殖し,場所の忠誠性を示す.
研究 の 目的:
- 実験的に,前年の経験と,その後の卵を産む日付の間の因果関係を調べる.
- 巣立ち期間の補給餌が将来の繁殖タイミングに影響するかどうかを判断する.
- 変化する生息地におけるこの経験主導の現象学的変化の適応的意義を評価する.
主な方法:
- 1つの繁殖期における巣づくり期間の食糧の利用可能性の実験的操作.
- 実験的に治療された雌と対照の雌のブルーティット (Parus caeruleus) の間の翌年の産卵日付の比較.
- 自然食の豊富さに関連した繁殖現象とチキの発達のモニタリング.
主要な成果:
- 前年に補給餌を受けたメスは,翌年にかなり遅れて卵を産んだ.
- この遅れた産卵は,前年の食料の供給との同期に関係なく発生した.
- その結果,その後の年の食糧供給のピークに照らして,卵は後で育てられた.
結論:
- 前年の栄養経験は,青い乳房の産卵日に因果的に影響を与えます.
- この遅延繁殖戦略は,変動する食糧資源を持つ異質な生息地では適応性がある可能性があります.
- ブルー・ティスのサイト・バインド繁殖行動は,この現象的可塑性の長期的な利点を促進します.
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