超越存在和缺席:使用eDNA和微卫星基因排型来估计野生种群中微观生命形式的密度
L M Liggan1, K C Rolheiser2, O Pontier2
1University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA.
Molecular ecology resources
|May 3, 2025
概括
环境DNA (eDNA) 分析现在可以使用新的R包来量化神秘物种,如公牛海藻类类生物体. 这种方法准确地估计了海洋息地的微观生物密度.
科学领域:
- 海洋生物学 海洋生物学
- 生态生态学 生态生态学
- 遗传学 是一个遗传学.
背景情况:
- 监测具有神秘生命史的生物,特别是显微阶段,对人口动态研究提出了重大挑战.
- 环境DNA (eDNA) 提供了一种非侵入性物种检测方法,最近的进展使得能够评估物种内基因多样性.
- 传统的调查方法往往不足以采样微观或难以捉摸的生命阶段.
研究的目的:
- 引入两个R包,Amplicomsat和GenotypeQuant,用于估计来自eDNA样本的个体数量.
- 验证一种基于eDNA的新方法的准确性和精度,用于量化微观生物.
- 应用开发的方法来估计自然息地内Nereocystis luetkeana (公牛) 类植物的密度.
主要方法:
- 开发Amplicomsat R包,用于清理高通量安普利康微卫星序列,并计算eDNA中的等位基因.
- 实施基因型量R包,使用数值最大概率估计器 (NMLE) 来确定对eDNA的贡献者数量.
- 进行模拟以描述方法的准确性和精度,然后在海藻森林生态系统中进行实验和现场eDNA采样.
主要成果:
- 模拟证明了该方法在估计来自eDNA的个体计数方面的可靠性.
- 在种植岩石上,NMLE对公牛藻类类植物细胞的估计显示,从已知的8个个体中,个体的变化为+3/-2个.
- 现场分析显示,7月份公牛的体球体密度在500至800体球体-2之间,丰度与采样面积相关.
结论:
- 开发的R包为使用eDNA量化神秘的微观生命阶段提供了强大的工具.
- 结合遗传多样性的eDNA分析提供了一种强大的方法来估计传统方法失败的人口密度.
- 这些发现突出了鱼树林动态中的雄牛鱼体球体丰富的生态意义.
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