Oceans Institute, Oceans Graduate School, The University of Western Australia, Crawley, Australia.
Indian Ocean Marine Research Centre, Australian Institute of Marine Science, Crawley, Australia.
PeerJ. 2022 May 31;10:e13323. doi: 10.7717/peerj.13323. eCollection 2022.
An understanding of stock recruitment dynamics in fisheries is fundamental to successful management. is a bivalve mollusc widely distributed throughout the Indo-Pacific and is the main species targeted for cultured pearl and pearl shell production in Australia. Pearl production in Australia relies heavily on wild-caught individuals, the majority of which come from the Eighty Mile Beach region near Broome in Western Australia. In this study, we used a genotyping by sequencing approach to explore fine-scale patterns of genetic connectivity among inshore shallow and offshore deep populations of near Eighty Mile Beach. Our results revealed high-levels of gene flow among inshore and offshore sites and no differences in genetic diversity between depths. Global estimates of genetic differentiation were low ( = 0.006) but significantly different from zero, and pairwise estimates of genetic differentiation among sites were significant in only 3% of comparisons. Moreover, Bayesian clustering detected no separation of inshore and offshore sample sites, and instead showed all samples to be admixed among sites, locations and depths. Despite an absence of any clear spatial clustering among sites, we identified a significant pattern of isolation by distance. In a dynamic environment like Eighty Mile Beach, genetic structure can change from year-to-year and successive dispersal and recruitment events over generations likely act to homogenize the population. Although we cannot rule out the null hypothesis of panmixia, our data indicate high levels of dispersal and connectivity among inshore and offshore fishing grounds.
了解渔业中的stock recruitment 动态对于成功管理至关重要。Pearl oyster 是一种广泛分布于印度洋-太平洋地区的双壳贝类软体动物，是澳大利亚养殖珍珠和珍珠贝生产的主要目标物种。澳大利亚的珍珠生产严重依赖野生捕捞个体，其中大部分来自西澳大利亚布鲁姆附近的 80 英里海滩地区。在这项研究中，我们使用了一种基于测序的基因分型方法来探索近海浅水区和近海深水区的 之间的遗传连通性的细微模式。我们的研究结果表明，近海和近海地点之间存在高水平的基因流动，并且深度之间没有遗传多样性的差异。全球遗传分化估计值较低（ = 0.006），但与零值显著不同，并且仅在 3%的比较中，地点之间的遗传分化的成对估计值具有统计学意义。此外，贝叶斯聚类未检测到近海和近海样本地点的分离，而是显示所有样本在地点、位置和深度之间存在混合。尽管地点之间没有明显的空间聚类，但我们确定了隔离与距离之间存在显著的模式。在像 80 英里海滩这样的动态环境中，遗传结构可能会逐年发生变化，并且世代之间的连续扩散和再定居事件可能会使种群同质化。尽管我们不能排除泛种群的无效假设，但我们的数据表明近海和近海渔区之间存在高水平的扩散和连通性。
