メタボリック・ロードとメタゾーン繁殖のコスト
Samuel C Ginther1, Hayley Cameron1,2, Craig R White1
1Centre for Geometric Biology, School of Biological Sciences, Monash University, Clayton, VIC 3800, Australia.
まとめ
再生には大きなエネルギーコストが伴うが,間接的な費用はしばしば過小評価される. この研究は,直接的および間接的なエネルギー支出の両方を定量化し,以前より高い総再生エネルギー需要を明らかにしました.
科学分野:
- 生殖生物学
- メタボリックエコロジー
- バイオエネルギー
背景:
- 生殖には2つの主要なエネルギー投資が伴う: 子孫のエネルギー含有量と妊娠中に消費されるエネルギー.
- 子孫を産むために費やされるエネルギー (間接的なコスト) は,ほとんど定量化されず,しばしば最小限であると仮定されます.
- 生殖エネルギー総支出を全面的に理解するには,直接的なコストと間接的なコストの両方を定量化する必要があります.
研究 の 目的:
- 生殖の総エネルギーコストを推定するための枠組みを策定し,提示する.
- 子孫のエネルギー含有量 (直接的コスト) と代謝負荷 (間接的コスト) のデータを組み合わせる.
- 直接的・間接的なコストの相対的な貢献を評価する.
主な方法:
- 直接的・間接的生殖コストデータを統合する枠組みの作成
- 種別における子孫のエネルギー含有量の分析
- 子育てに伴う代謝負荷の推定
主要な成果:
- 直接的なコスト (子孫エネルギー) は,通常,総再生エネルギー支出の小さな部分を占めています.
- 哺乳類は生殖コスト (授乳期間を除く) が最も高く,間接的なコストは約90%を占めています.
- 産卵するエクトースは 産卵するエクトースよりも 高い間接的な生殖コストを負う.
結論:
- 生殖の総エネルギー需要は 一般的に想定されるよりもかなり高い.
- 間接的なコストは,再生エネルギー支出の主要な,しばしば過小評価されている要素です.
- 繁殖エネルギーコストは分類によって大きく異なるが,哺乳類と赤熱生物の違いは顕著である.
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