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化温度的地理变化促进了广泛共同分布的海中可行的后代的生产
Gerardo A Cordero1, Michelle L Balk1, César E Pérez-González1
1Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, Iowa, USA.
概括
乌物种对化温度的反应各不相同,北方种群在较高温度 (33°C) 的生存率相比,南方种群的生存率降低. 这突显了爬行动物繁殖中的本地适应.
科学领域:
- 类学 类学 类学
- 生态生态学 生态生态学
- 进化生物学 进化生物学
背景情况:
- 许多生物体的早期生命阶段,包括爬行动物,对环境条件敏感.
- 化温度显著影响爬行动物的发育率和生存率,通常最佳温度低于31°C.
研究的目的:
- 为了比较两种化温度 (30°C和33°C) 对同源物种对的影响.
- 为了研究地理分布和人口水平差异如何影响乌蛋的热耐受性.
主要方法:
- 在30°C和33°C的控制温度下,化来自不同种群的乌蛋.
- 测量后代的生存率,发育率和游泳速度.
主要成果:
- 北方软海 (Apalone spp.) 是一个类型. 在33°C时,南方群体的生存率很低 (40%),而南方群体的生存率很高 (76%-93%),游泳速度更快.
- 北方地图海 (Graptemys spp.) 是一种北方地图海. 在33°C时,这些种群的生存率降低了 (28%-60%),但与30°C相比,发育率增加了高达75%.
- 在一种物种中观察到一个反渐变的反应,在33°C的北方化匹配了南方化的高速度.
结论:
- 乌生育后代的最佳温度范围是可变的,受种群和物种特定适应的影响.
- 这些发现支持广泛分布的卵性物种中局部适应的作用,并建议进一步研究人口层面的差异.
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