有效大小的时间变化 (Temporal Variability in Effective Size) 识别了标记回收和近亲标记回收之间的差异的潜在来源,估计了人口丰富度
Daniel E Ruzzante1, Gregory R McCracken1, Dylan J Fraser2
1Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
Molecular ecology resources
|November 25, 2024
概括
估计野生种群大小需要多年的数据,因为每年的有效种群大小可以大幅波动. 对于小种群的代表性估计,建议至少使用3-4年的数据.
科学领域:
- 人口遗传学 人口遗传学
- 生态生态学 生态生态学
- 保护生物学 保护生物学
背景情况:
- 估计有效种群大小 (Ne) 和人口普查大小 (N) 对于了解野生种群至关重要.
- 很少有研究研究Ne和N的年间变化,这限制了我们对估计可重复性和代表性的理解.
研究的目的:
- 调查河种群的有效种群大小 (Ne) 和人口普查大小 (N) 的年间变化.
- 评估单年估计对长期人口动态的代表性.
- 为了比较标记回收和近亲标记回收方法来估计N.
主要方法:
- 在7个种群中5年内用33个微观卫星对5400个鱼个体进行基因定型.
- 使用遗传数据估计生育者有效数量 (Nb) 和有效种群规模 (Ne).
- 通过标记再捕获 (电捕鱼) 和近亲标记再捕获 (CKMR) 估计人口普查大小 (N).
主要成果:
- 年度Ne在种群内变化很大 (1.6-58倍),所有种群的中位数变化为5倍.
- 估计的Ne每年变化几乎是估计N的两倍.
- 标记回收和CKMR对N的估计对于大多数种群都是一致的,除了高Ne/N变异表明采样不足的情况.
结论:
- 单年估计的Ne可能不代表小野生种群的长期动态.
- 至少需要3-4个年度估计,以代表当代的Ne.
- CKMR是一种经过验证的丰富度估计方法,并且时间Ne变化可以解释N估计方法之间的差异.
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