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<p>The decorator worm <i>Diopatra cuprea</i> Bosc, 1802 (Annelid; Polycheate; Onuphidae) is an ecosystem engineer within high-salinity estuaries of the southern and eastern United States. A previous study revealed five morphologically cryptic mitochondrial lineages across its broad geographic distribution. Here, we explore mitonuclear concordance of these lineages using single nucleotide polymorphisms (SNPs) genotyped with RADseq.&#xa0;We genotyped 3,162 SNPs from 233 <i>D. cuprea</i> and detected four deep lineages in the nuclear genome: a northern US clade (Massachusetts), a single nuclear clade within mid-Atlantic populations (i.e., Virginia south through northeastern Florida), a southeastern Florida clade, and a Gulf of Mexico clade. There was mitonuclear concordance within most individuals for three lineages, while two mitochondrial lineages were detected in a single mid-Atlantic nuclear lineage. Thus, there appear to be four cryptic lineages of <i>D. cuprea</i> that suggest four distinct species that rarely hybridize. Within the mid-Atlantic lineage, we detected increasing genetic isolation of populations with increasing geographic distance, a pattern consistent with low dispersal of <i>D. cuprea</i> larvae. Cryptic diversity within the <i>D. cuprea</i> complex is consistent with other common and geographically widespread annelid and <i>Diopatra</i> species that are now being revealed using high-throughput sequencing.</p>

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Multiple cryptic lineages and restricted gene flow in the decorator worm Diopatra Cuprea

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月25日

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  • Adam J. Ziegler,
  • Tina M. Bell,
  • Sarah K. Berke,
  • Allan E. Strand,
  • Erik E. Sotka

摘要

The decorator worm Diopatra cuprea Bosc, 1802 (Annelid; Polycheate; Onuphidae) is an ecosystem engineer within high-salinity estuaries of the southern and eastern United States. A previous study revealed five morphologically cryptic mitochondrial lineages across its broad geographic distribution. Here, we explore mitonuclear concordance of these lineages using single nucleotide polymorphisms (SNPs) genotyped with RADseq. We genotyped 3,162 SNPs from 233 D. cuprea and detected four deep lineages in the nuclear genome: a northern US clade (Massachusetts), a single nuclear clade within mid-Atlantic populations (i.e., Virginia south through northeastern Florida), a southeastern Florida clade, and a Gulf of Mexico clade. There was mitonuclear concordance within most individuals for three lineages, while two mitochondrial lineages were detected in a single mid-Atlantic nuclear lineage. Thus, there appear to be four cryptic lineages of D. cuprea that suggest four distinct species that rarely hybridize. Within the mid-Atlantic lineage, we detected increasing genetic isolation of populations with increasing geographic distance, a pattern consistent with low dispersal of D. cuprea larvae. Cryptic diversity within the D. cuprea complex is consistent with other common and geographically widespread annelid and Diopatra species that are now being revealed using high-throughput sequencing.