蓝绿色章鱼(灰色,1849),在西南印度洋(SWIO),构成了生计和商业渔业的重要资源。然而,尽管有这样的社会经济重要性,以及最近过度捕捞的迹象,对该地区O.cyanea的种群结构知之甚少。为可持续管理策略提供信息,这项研究评估了SWIO20个地点的O.cyanea的时空种群结构和遗传变异性(肯尼亚,坦桑尼亚,莫桑比克,马达加斯加,毛里求斯,罗德里格斯,和Seychelle群岛)通过线粒体DNA(mtDNA)非编码区(NCR)序列和微卫星标记的互补分析。MtDNA分析揭示了整个地区的浅层系统发育,人口统计学测试表明,历史上的人口波动可能与冰川周期有关。与预期相反,NCR变异与其他mtDNA区域相当,表明NCR不是高变区。核和mtDNA标记类型均显示缺乏与整个区域的高基因流动相容的遗传结构。由于成年人久坐不动,这种基因流很可能反映了旁向传播的连通性。所有样本都报告了杂合子缺陷,which,考虑到整体结构的缺失,可能反映了短暂的幼虫招募变异性。mtDNA和核变异性的水平在所有位置都相似,与先前报道的收获的八角科一致,暗示对漂移遗传侵蚀的抵抗力,提供当前的库存大小保持不变。然而,作为SWIO中的O.cyanea库存代表一个单一的,高度联系的人口,渔业可能受益于额外的管理措施,例如,轮换关闭与平行生态相一致,跨越地缘政治边界。
Octopus cyanea (Gray, 1849), abundant in the South-West Indian Ocean (SWIO), constitutes a vital resource for both subsistence and commercial fisheries. However, despite this socioeconomic importance, and recent indications of overfishing, little is known about the population structure of O. cyanea in the region. To inform sustainable management strategies, this study assessed the spatio-temporal population structure and genetic variability of O. cyanea at 20 sites in the SWIO (Kenya, Tanzania, Mozambique, Madagascar, Mauritius, Rodrigues, and the Seychelle Islands) by complementary analysis of mitochondrial DNA (mtDNA) noncoding region (NCR) sequences and microsatellite markers. MtDNA analysis revealed a shallow phylogeny across the region, with demographic tests suggesting historic population fluctuations that could be linked to glacial cycles. Contrary to expectations, NCR variation was comparable to other mtDNA regions, indicating that the NCR is not a hypervariable region. Both nuclear and mtDNA marker types revealed a lack of genetic structure compatible with high gene flow throughout the region. As adults are sedentary, this gene flow likely reflects connectivity by paralarval dispersal. All samples reported heterozygote deficits, which, given the overall absence of structure, likely reflect ephemeral larval recruitment variability. Levels of mtDNA and nuclear variability were similar at all locations and congruent with those previously reported for harvested Octopodidae, implying resilience to genetic erosion by drift, providing current stock sizes are maintained. However, as O. cyanea stocks in the SWIO represent a single, highly connected population, fisheries may benefit from additional management measures, such as rotational closures aligned with paralarval ecology and spanning geopolitical boundaries.