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首页> 美国卫生研究院文献>Proceedings of the Royal Society B: Biological Sciences >Effective number of breeders, effective population size and their relationship with census size in an iteroparous species, Salvelinus fontinalis
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Effective number of breeders, effective population size and their relationship with census size in an iteroparous species, Salvelinus fontinalis

机译：相同种群的繁殖物种Salvelinus fontinalis的有效繁殖者数量，有效种群数量及其与人口普查大小的关系

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The relationship between the effective number of breeders (Nb) and the generational effective size (Ne) has rarely been examined empirically in species with overlapping generations and iteroparity. Based on a suite of 11 microsatellite markers, we examine the relationship between Nb, Ne and census population size (Nc) in 14 brook trout (Salvelinus fontinalis) populations inhabiting 12 small streams in Nova Scotia and sampled at least twice between 2009 and 2015. Unbiased estimates of Nb obtained with individuals of a single cohort, adjusted on the basis of age at first maturation (α) and adult lifespan (AL), were from 1.66 to 0.24 times the average estimates of Ne obtained with random samples of individuals of mixed ages (i.e. ). In turn, these differences led to adjusted Ne estimates that were from nearly five to 0.7 times the estimates derived from mixed-aged individuals. These differences translate into the same range of variation in the ratio of effective to census population size within populations. Adopting as the more precise and unbiased estimates, we found that these brook trout populations differ markedly in their effective to census population sizes (range approx. 0.3 to approx. 0.01). Using AgeNe, we then showed that the variance in reproductive success or reproductive skew varied among populations by a factor of 40, from Vk/k ≈ 5 to 200. These results suggest wide differences in population dynamics, probably resulting from differences in productivity affecting the intensity of competition for access to mates or redds, and thus reproductive skew. Understanding the relationship between Ne, Nb and Nc, and how these relate to population dynamics and fluctuations in population size, are important for the design of robust conservation strategies in small populations with overlapping generations and iteroparity.
机译：在具有重叠世代和同等性的物种中，很少凭经验检查育种者的有效数量（Nb）与世代有效大小（Ne）之间的关系。基于一套11个微卫星标记，我们研究了新斯科舍省12条小溪流中的14条溪鳟（Salvelinus fontinalis）种群中Nb，Ne与人口普查种群大小（Nc）之间的关系，该种群在2009年至2015年之间至少采样了两次。根据首次成熟时的年龄（α）和成人寿命（AL）进行调整的单个队列的个体对Nb的无偏估计是从混合个体的随机样本所获得的Ne的平均估计值的1.66到0.24倍年龄（即）。反过来，这些差异导致调整后的Ne估算值接近混合年龄个体估算值的5到0.7倍。这些差异转化为人口中有效人口与人口普查人口比率之比的相同变化范围。通过采用更精确和无偏的估计，我们发现这些溪鳟种群与人口普查种群的有效种群之间存在显着差异（范围大约在0.3到0.01之间）。然后，使用AgeNe，我们发现种群间生殖成功或生殖偏斜的差异为40倍，从Vk / k≈5到200。这些结果表明种群动态差异很大，可能是由于生产力差异影响了种群动态。争夺伴侣或红血统的竞争激烈程度，从而导致生殖偏斜。了解Ne，Nb和Nc之间的关系以及它们与种群动态和种群规模波动之间的关系，对于设计具有重叠世代和等价性的小种群中强有力的保护策略至关重要。

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