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有证据表明,对于保持高度灵活的基底,但不是峰值,新陈代谢率的鸟类来说,维护成本是非常高的
David L Swanson1, Maria Stager2, François Vézina3
1Department of Biology, University of South Dakota, Vermillion, SD, USA. david.swanson@usd.edu.
Scientific reports
|June 2, 2023
概括
生物利用表型灵活性适应环境. 这项研究发现,虽然一些鸟类因灵活的基础代谢率而产生能量成本,但最大代谢率或代谢范围的高灵活性通常不会增加维护成本.
科学领域:
- 生理生态生态学 生理生态学
- 代谢灵活性 代谢灵活性
- 动物适应 动物适应
背景情况:
- 现型灵活性有助于有机体将其特征与环境条件相匹配,从而可能赋予体能优势.
- 与表型灵活性相关的成本和约束尚未完全理解.
- 一个潜在的成本是能量支出,可能反映在高基底代谢率 (BMR) 中.
研究的目的:
- 测试代谢灵活性与高维护成本相关的假设,特别是BMR.
- 为了研究BMR的灵活性,最大冷诱导代谢率 (Msum) 和鸟类BMR的代谢范围之间的相关性.
主要方法:
- 利用了鸟类热适应研究的数据.
- 在适应之前和之后测量BMR和Msum以量化代谢灵活性 (ΔBMR, ΔMsum, ΔScope).
- 分析了六种物种的代谢灵活性和BMR测量之间的相关性.
主要成果:
- 在六种物种中,有三种物种在适应持续至少三周时,显示了BMR灵活性 (ΔBMR) 和BMR之间的正相关性.
- 没有发现任何物种的MSUM (ΔMsum) 灵活性和BMR之间存在显著的相关性.
- 只有一种物种在代谢范围灵活性 (ΔScope) 和BMR之间表现出显著的正相关性.
结论:
- 有证据表明,保持高BMR灵活性可能会导致一些鸟类的支持成本.
- 在 Msum 或代谢范围的高灵活性似乎通常不涉及高代谢维护成本.
- 代谢灵活性有不同的成本影响,具体取决于所研究的特定代谢特征.
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