普通珊瑚Pocillopora sppp的热性能的度变化
P J Edmunds1, D J Combosch2, H Torrado2
1Department of Biology, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA.
The Journal of experimental biology
|May 3, 2024
概括
热带珊瑚如Pocillopora对海洋变暖的适应能力有限. 它们的热性能曲线表明,迁移不会帮助它们适应未来的极端温度,突出了对代谢可塑性的需求.
科学领域:
- 海洋生物学 海洋生物学
- 气候变化 生态学 生态学
- 珊瑚生理学 珊瑚生理学
背景情况:
- 热带珊瑚面临海温上升,影响它们的生存.
- 了解珊瑚的热耐受性对于预测它们未来的持久性至关重要.
- 波西洛波拉珊瑚在太平洋地区广泛分布,这使得它们成为一个关键的模型生物.
研究的目的:
- 为了研究波西洛波拉珊瑚群体的热性能曲线 (TPC) 跨越度梯度.
- 为了比较不同热状态的珊瑚的生理反应 (呼吸和光合作用).
- 评估珊瑚群体适应或适应未来变暖情景的能力.
主要方法:
- 研究了从穆雷亚,关岛和冲绳跨越44度度的波西洛波拉珊瑚种群.
- 使用热性能曲线 (TPC) 测量呼吸和总光合作用.
- 分析了与当地每年海水温度和每日温度变化相关的TPC.
主要成果:
- 呼吸TPC在不同度上是相似的,最佳温度超过了局部最大值.
- 总光合作用TPC显示出更广泛的热耐受性 (eurytopy),在Moorea的最佳温度更高.
- 冲绳和关岛的珊瑚经历了更大的每日温度波动,影响了能源预算.
结论:
- 在Pocillopora种群中,TPC的差异不足以支持通过迁移进行适应.
- 珊瑚群体可能更多地依赖于代谢可塑性和耐受季节变化的耐受性,以在不断变化的气候下生存.
- 横跨度的有限的表型可塑性表明,在未来更温暖的海洋中,珊瑚的持久性面临挑战.
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