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The Korean Society of Phycology (한국조류학회(藻類))
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Cryptic diversity and phylogeographic patterns of Plocamium telfairiae and P. cartilagineum (Plocamiales, Rhodophyta) in the Northwest Pacific

  • Mi Yeon Yang (Research Institute for Basic Sciences, Jeju National University) ;
  • Myung Sook Kim (Research Institute for Basic Sciences, Jeju National University)
  • Received : 2023.04.17
  • Accepted : 2023.08.04
  • Published : 2023.09.15
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Abstract

Cryptic diversity refers to two or more distinct species classified as a single species due to lack of morphological difference. Although Plocamium Lamouroux has potential applications in biotechnology, several phylogenetic studies suggest the presence of cryptic diversity within the genus that requires further phylogenetic evaluation. Here, we investigated two species of Plocamium, P. "cartilagineum" and P. "telfairiae", in the Northwest (NW) Pacific. The aims of this study are to identify potential cryptic species by analyzing the genetic differences between the species from their type localities and specimens from the NW Pacific, to characterize their population genetic diversity and structure, and to find potential hotspots with high intraspecific genetic diversity in Korea. A reconstructed phylogenetic tree based on mitochondrial 5' region of cytochrome c oxidase subunit I (COI-5P) and plastid ribulose-1,5-bisphosphate carboxylase / oxygenase large subunit (rbcL) with molecular delimitation methods revealed significant differences as distinct species in the genus Plocamium. Comparison with specimens from their type localities indicated the presence of two cryptic species in the NW Pacific, including Plocamium luculentum sp. nov. The phylogeographic study for both species showed low genetic differences among populations, demonstrating genetic connectivity within the NW Pacific. These findings could promote the discovery of other morphologically and ecologically similar but phylogenetically different Plocamium species worldwide, which is essential for conservation assessments.

Keywords

Acknowledgement

This research was supported by the 2022 scientific promotion program funded by Jeju National University.

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