BACKGROUND Copepods are key components of aquatic ecosystems and can help regulate the global carbon cycle. Much attention has been paid to the species diversity of copepods worldwide, but the phylogeography and genetic diversity of copepods in Nigeria is unexplored. RESULTS Using a mitochondrial cytochrome c oxidase subunit I marker, we preformed phylogenetic and phylogeographic analyses for Cyclopidae copepods in Southeast Nigeria. A high species diversity of Cyclopidae in Nigeria: 5 species of Tropocyclops, 5 species of Mesocyclops and 2 species of Thermocyclops from Cyclopidae were identified in 15 populations. Moreover, we detected 18 unique haplotypes, which fell into two distinct clades. Pairwise genetic distances (uncorrected p-distances) among the species of Cyclopidae ranged from 0.05 to 0.257. Several species co-existed in the same lake, and some haplotypes were shared among different geographic populations, suggesting a dispersal of Cyclopidae in our sampling region. Finally, we found that the population genetic diversity for each species of Cyclopidae was low in Nigeria. CONCLUSIONS Our findings explored the species diversity and distribution of copepods within the family Cyclopidae for 15 Nigerian freshwater ecosystems: a high species diversity of Cyclopidae copepods was detected over a small geographic sampling range. Results from this study contribute to a better understanding of copepod diversity of Nigerian freshwater ecosystems.

中文翻译：

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尼日利亚东南部淡水生态系统中pe足类环足科（甲壳纲：环足纲）的系统地理学和遗传多样性。

背景技术pe足类是水生生态系统的关键组成部分，可以帮助调节全球碳循环。全世界对co足类的物种多样性已经给予了很多关注，但是尼日利亚对pe足类的系统地理学和遗传多样性尚未开发。结果使用线粒体细胞色素C氧化酶亚基I标记，我们对尼日利亚东南部的环足科pe足类进行了系统发育和系统地理分析。尼日利亚独眼巨科的物种多样性很高：在15个种群中鉴定出5种热带对虾，5种中环和2种热眼动物。此外，我们检测到18个独特的单倍型，分为两个不同的进化枝。Cyclopidae物种之间的成对遗传距离（未校正的p距离）介于0.05至0.257之间。在同一个湖中共存有几种物种，并且在不同地理种群之间共享某些单倍型，这表明环纹科在我们的采样区域中分散了。最后，我们发现尼日利亚每个环科的种群遗传多样性都较低。结论我们的发现探索了15个尼日利亚淡水生态系统中独足纲中within足纲的物种多样性和分布：在较小的地理采样范围内发现了独足纲op足纲的高物种多样性。这项研究的结果有助于更好地了解尼日利亚淡水生态系统的pe足类多样性。我们发现尼日利亚的每个科科的种群遗传多样性都很低。结论我们的发现探索了15个尼日利亚淡水生态系统中独足纲中within足纲的物种多样性和分布：在较小的地理采样范围内发现了独足纲op足纲的高物种多样性。这项研究的结果有助于更好地了解尼日利亚淡水生态系统的pe足类多样性。我们发现尼日利亚的每个科科的种群遗传多样性都很低。结论我们的发现探索了15个尼日利亚淡水生态系统中独足纲中within足纲的物种多样性和分布：在较小的地理采样范围内发现了独足纲op足纲的高物种多样性。这项研究的结果有助于更好地了解尼日利亚淡水生态系统的pe足类多样性。