Loss of microsatellite diversity and low effective population size in an overexploited population of New Zealand snapper (Pagrus auratus)
Loss of microsatellite diversity and low effective population size in an overexploited population of New Zealand snapper (Pagrus auratus)
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DOI：
10.1073/pnas.172242899
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发表时间：
2002-09-03
影响因子：
11.1
通讯作者：
Carvalho, GR
中科院分区：
文献类型：
--
作者：
Hauser, L;Adcock, GJ;Carvalho, GR
虽然过度捕捞对物种多样性和丰富度的影响有充分的记录，但对海洋鱼类种群遗传多样性的威胁迄今在很大程度上被忽视。事实上，似乎没有什么值得关注的，因为即使是“崩溃”的种群通常也有几百万个个体，而种群遗传学理论表明，只有很小的种群会遭受遗传多样性的重大损失。另一方面，在许多海洋物种中，决定种群遗传特性的遗传有效种群规模（N-e）可能比普查种群规模（N）小几个数量级。在这里，微卫星分析的一个时间序列的存档规模证明了新西兰笛鲷种群的遗传多样性显着下降，在其开发历史。从杂合性下降和等位基因频率的时间波动估计的有效人口规模比渔业数据的人口普查规模小5个数量级。如果这样低的氮-电子/氮比率在海洋物种中很常见，许多被开发的海洋鱼类种群可能会失去遗传变异性，可能导致适应性、种群持久性和生产力下降。
Although the effects of overfishing on species diversity and abundance are well documented, threats to the genetic diversity of marine fish populations have so far been largely neglected. Indeed, there seems to be little cause for concern, as even "collapsed" stocks usually consist of several million individuals, whereas population genetics theory suggests that only very small populations suffer significant loss of genetic diversity. On the other hand, in many marine species the genetically effective population size (N-e), which determines the genetic properties of a population, may be orders of magnitude smaller than the census population size (N). Here, microsatellite analyses of a time series of archived scales demonstrated a significant decline in genetic diversity in a New Zealand snapper population during its exploitation history. Effective population sizes estimated both from the decline in heterozygosity and from temporal fluctuations in allele frequency were five orders of magnitude smaller than census population sizes from fishery data. If such low N-e/N ratios are commonplace in marine species, many exploited marine fish stocks may be in danger of losing genetic variability, potentially resulting in reduced adaptability, population persistence, and productivity.