Frontiers in Marine Science

3.7

EISSN 2296-7745

Front. Mar. Sci. 10:1087507

SCIE

[논문]Deep genetic divergences and geographic distribution of the red algal genus Caulacanthus (Gigartinales)

Mi Yeon Yang and Myung Sook Kim

양미연, 김명숙

An increasing number of studies have demonstrated that genetic differentiation
and cryptic diversity in the sea occur over considerably smaller spatial scales than
previously comprehended, considering the wide distribution range of many
morphologically defined macroalgal species. However, knowledge of the turfforming
red alga Caulacanthus is incomplete regarding its species diversity, as
well as genetic differentiation within the genus. We analyzed Caulacanthus
specimens from the NW Pacific, NE Pacific, Central Pacific, SW Pacific, SE
Indian, NE Atlantic, and SE Atlantic Ocean using mitochondrial cytochrome
oxidase subunit I (COI-5P), plastid ribulose-1,5-bisphosphate carboxylase/
oxygenase (rbcL), and Rubisco spacer (rbcL-S). The objectives of this study
were to 1) determine the number of species that exhibit the morphology of C.
ustulatus, 2) investigate the present distribution pattern of Caulacanthus species,
and 3) estimate the degree of genetic connectivity between the populations of
Caulacanthus species from different regions. Our results revealed molecular
evidence that the genus Caulacanthus comprises of at least seven species with
deep genetic divergence, which is indicative of not only a strong geographical
subdivision but also a relatively long temporal discontinuity. Most species
exhibited limited geographic distribution, showing considerable genetic
divergence in the populations isolated by distance. Our study provides
evidence of a greater evolutionary independence of Caulacanthus populations,
which have undergone a series of allopatric diversification events.

2023.04.26.

https://doi.org/10.3389/fmars.2023.1087507