升高的温度改变了两种入侵性棘物种的花头高度分布和种子分散模式
Trevor H Drees1, Katriona Shea1
1Department of Biology and IGDP in Ecology, The Pennsylvania State University, University Park, Pennsylvania, USA.
Ecology
|October 30, 2023
概括
气候变化加速了植物的分散. 更高的温度增加了种子头的高度,导致更快的种群传播,并且在从单个释放点建模时可能会高估传播率.
科学领域:
- 生态生态学 生态生态学
- 气候变化生物学 气候变化生物学
- 植物科学 植物科学
背景情况:
- 气候变化影响着生物的分散,影响着种群动态和物种管理.
- 风分散植物是研究气候变化对分散的影响的关键模型.
- 当前的分散模型往往简化了从单一点释放种子,可能误估了传播.
研究的目的:
- 调查气候变化如何影响风散植物的分散距离和传播速率.
- 评估考虑所有种子释放点与单一最大高度的影响.
- 量化温度驱动的花头高度变化及其对分散的影响.
主要方法:
- 使用被动变暖实验来量化*Carduus nutans*和*Carduus acanthoides*中对花头高度的温度影响.
- 采用沃尔德分析长距离 (WALD) 模型来估计分散变化.
- 使用现有的C. nutans人口统计数据来模拟不同温度场景下的种群传播率.
主要成果:
- 增长温度的~0.6°C增加显著提高了两个棘物种的平均和最大花头高度.
- 来自加热植物的种子显示出超过分散距离的可能性更高,C. acanthoides*种子的传播距离是≥10m的1.71倍.
- 温度的升高使*C.nutans*的模拟种群传播率提高了42.2%.
- 仅仅从最大高度进行模拟分散,与考虑所有释放点相比,高估的扩散率高达28.5%.
结论:
- 升高的温度加快了像棘这样的风散植物中的种群传播.
- 假设单点种子释放 (最大高度) 可以大大高估分散率.
- 在气候变化下的植物分散的准确建模需要考虑种子释放高度的完整分布.
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