西方蚊虫鱼 (Gambusia affinis) 捕食者相关突发速度生态表型的可预测性和概念重复性
Rose C Blanchard1, Thomas J DeWitt2, Sharmila Young1
1Department of Ecology and Conservation Biology, Texas A&M University, College Station, Texas, USA.
Journal of fish biology
|January 27, 2024
概括
西方蚊虫鱼的捕食者相关爆发速度 (PABS) 生态表型在不同种群中可重复,但其具体特征因当地捕食者数量和环境因素而有所不同. 这种形态为未经研究的种群提供了一些预测能力.
科学领域:
- 进化生物学是进化的生物学.
- 生态生态学 生态生态学
- 鱼类学 鱼类学 鱼类学
背景情况:
- 捕食是鱼类形态进化变化的重要驱动因素.
- 与捕食者相关的爆发速度 (PABS) 生态表型,以较小的头/身体和较大的尾部区域为特征,在阳捕食者存在时观察到西蚊鱼 (Gambusia affinis).
- 这种生态表型在不同种群中的可重复性和可转移性仍然在很大程度上未经测试.
研究的目的:
- 评估确认PABS生态表型在独立的蚊虫鱼种群中的方法的可重复性.
- 为了研究鱼类形态和捕食者繁多之间的相关性.
- 评估使用区分函数分析 (DFA) 来根据捕食者暴露对鱼类进行分类的可重复性.
- 使用DFA对PABS模型进行交叉验证,以预测新种群中的掠食者状态.
主要方法:
- 经变换的MANOVA (PMANOVA) 用于分析与捕食者存在和丰富性相关的形态数据.
- 区分功能分析 (DFA) 用于根据形态特征对鱼类进行分类,并预测捕食者状态.
- 进行了交叉研究验证,以测试PABS模型在不同人群中的预测能力.
主要成果:
- 在暴露于捕食者的蚊虫鱼种群中始终发现PABS生态表型,尽管有特定位置的变化.
- 形态显著受到掠食者丰富的影响,在不同的掠食水平上观察到明显的身体形状差异.
- 与研究内部验证相比,DFA的交叉研究验证的准确性较低,表明预测模型的可转移性有限.
结论:
- PABS生态表型是西方蚊虫鱼对掠食的可重复反应.
- 虽然PABS生态表型为未经研究的种群提供了一些预测能力,但其表达受到当地环境条件和捕食者动态的调节.
- 在捕食者的存在下,尾部区域的延长是跨越研究的一致发现.
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