High levels of gene flow in the surf bivalve Donax deltoides (Bivalvia: Donacidae) on the east coast of Australia
High levels of gene flow in the surf bivalve Donax deltoides (Bivalvia: Donacidae) on the east coast of Australia
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澳大利亚东海岸海浪双壳类 Donax deltoides（双壳纲：Donacidae）的高水平基因流
DOI：
10.1007/s002270050071
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发表时间：
1997
期刊：
影响因子：
2.4
通讯作者：
D. Ayre
中科院分区：
文献类型：
--
作者：
S. Murray;D. Ayre
翻译后摘要我们调查了12个样本的pipi Donax deltoides拉马克的等位基因变异的模式，从海滩分离高达1200公里，但连接到不同程度的东澳大利亚电流。我们用这些数据来检验水运动的不规则模式将导致琵琶鱼遗传分化的预测，因此，在更南部的地区内部和之间将有更多的遗传变异比北方地区。我们发现，6个位点至少在所有样本中有中度变异，并且在等位基因频率中没有明确的地理模式。在一般情况下，样本内的基因型频率与预测的一个异交，有性繁殖的物种是一致的，我们没有发现人口细分的证据。在样本中，除了肽酶位点，单位点基因型频率与Hardy-Weinberg平衡的预期密切一致。我们观察到任何样本中的基因座的任何成对比较都没有显着的连锁不平衡。我们的遗传变异的层次分析显示，所有样品之间的变化很小（Fst = 0.009）。基因座表现出一贯低水平的细分（Fst从0.003到0.018）。我们发现几乎没有变化的四个地理区域采样（Frt = 0.001）。因此，所有变异均归因于区域内样本间的变异（Fsr = 0.010）。这些数据意味着，幼虫正在区域之间移动，目前或最近的基因流水平很高，并支持其他研究的结论，这些研究推断了通过该地区部分地区的异交幼虫传播的动物的广泛基因流。这意味着，东澳大利亚电流是足以产生强大的幼虫连接，尽管其间歇性。如果现有的种群细分水平反映了当前的基因流水平，那么这些数据意味着D。三角洲代表澳大利亚东海岸的单一渔业。
Abstract We surveyed patterns of allelic variation within twelve samples of the pipi Donax deltoides Lamarck from beaches separated by up to 1200 km but connected to varying degrees by the East Australian Current. We used these data to test the prediction that the irregular patterns of water movement would cause genetic differentiation in pipis, so that there would be more genetic variation within and among the more southern regions than the northern regions. We found that six loci were at least moderately variable within all samples, and there were no clear geographic patterns in allelic frequencies. In general, genotype frequencies within samples were consistent with predictions for an outcrossed, sexually reproducing species, and we detected no evidence of population subdivision. Within samples, with the exception of the peptidase loci, single-locus genotype frequencies were in close agreement with expectations for Hardy–Weinberg equilibrium. We observed no significant linkage disequilibrium for any pairwise comparison of loci in any sample. Our hierarchical analysis of genetic variation revealed little variation among all samples (Fst = 0.009). Loci showed consistently low levels of subdivision (Fst from 0.003 to 0.018). We found almost no variation among the four geographic regions sampled (Frt = 0.001). All variation was therefore attributable to variation among samples within regions (Fsr = 0.010). These data imply that larvae are moving between regions and that levels of present or recent gene flow are high, and support the conclusions of other studies which have inferred widespread gene flow for animals dispersing via planktonic, outcrossed larvae in parts of this region. This implies that the East Australian Current is sufficient to produce strong larval connections despite its intermittent nature. If existing levels of population subdivision reflect current levels of gene flow, then these data imply that D. deltoides represents a single fishery on the east coast of Australia.