Global distribution of cryptic native, introduced and hybrid lineages in the widespread estuarine amphipod Ampithoe valida
Global distribution of cryptic native, introduced and hybrid lineages in the widespread estuarine amphipod Ampithoe valida
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DOI：
10.1007/s10592-022-01452-8
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发表时间：
2022-06-11
影响因子：
2.2
通讯作者：
Sotka, Erik E.
中科院分区：
文献类型：
--
作者：
Harper, Katherine E.;Scheinberg, Lauren A.;Sotka, Erik E.
生物入侵可能对沿海生态系统构成严重威胁，但由于物种识别不准确和神秘多样性，很难追踪。在这里，我们通过对来自日本、北美和阿根廷的683个个体的mtDNA位点进行测序，并对349个个体的10，295个单核苷酸多态性（SNP）进行基因分型，澄清了海洋端足类Ampithoe valida的神秘多样性和引入历史。物种复合体由三个神秘的谱系组成：两个本地太平洋和一个本地大西洋线粒体谱系。该杂岩可能起源于北太平洋，并通过约300万年的跨北极交换扩散到北大西洋。非原生A.阿根廷的valida具有大西洋线粒体和核基因型，强烈表明从北美东部引入。在两个东太平洋河口，旧金山弗朗西斯科湾和洪堡湾，加州，遗传数据表明，人类介导的大西洋和太平洋的杂交来源，和可能的线粒体基因座，核基因座，或两者的适应性渐渗。旧金山弗朗西斯科湾的混合人口定期经历人口爆发和深刻的损害大叶藻通过直接消费，这些生态影响还没有记录在其他地方。我们推测大西洋和太平洋血统的新组合可能在A. valida在旧金山弗朗西斯科湾独特的生态。我们的研究结果加强了这样一种观点，即当存在神秘的原生结构时，我们可以高估非原生入侵的数量。此外，如果不同时调查核基因组，从线粒体基因座推断人口和进化史可能会产生误导。
Biological invasions can pose a severe threat to coastal ecosystems, but are difficult to track due to inaccurate species identifications and cryptic diversity. Here, we clarified the cryptic diversity and introduction history of the marine amphipod Ampithoe valida by sequencing a mtDNA locus from 683 individuals and genotyping 10,295 single-nucleotide polymorphisms (SNPs) for 349 individuals from Japan, North America and Argentina. The species complex consists of three cryptic lineages: two native Pacific and one native Atlantic mitochondrial lineage. It is likely that the complex originated in the North Pacific and dispersed to the north Atlantic via a trans-arctic exchange approximately 3 MYA. Non-native A. valida in Argentina have both Atlantic mitochondrial and nuclear genotypes, strongly indicating an introduction from eastern North America. In two eastern Pacific estuaries, San Francisco Bay and Humboldt Bay, California, genetic data indicate human-mediated hybridization of Atlantic and Pacific sources, and possible adaptive introgression of mitochondrial loci, nuclear loci, or both. The San Francisco Bay hybrid population periodically undergoes population outbreaks and profoundly damages eelgrass Zostera marina thalli via direct consumption, and these ecological impacts have not been documented elsewhere. We speculate that novel combinations of Atlantic and Pacific lineages could play a role in A. valida's unique ecology in San Francisco Bay. Our results reinforce the notion that we can over-estimate the number of non-native invasions when there is cryptic native structure. Moreover, inference of demographic and evolutionary history from mitochondrial loci may be misleading without simultaneous survey of the nuclear genome.