Genetic diversity hotspot of the amphi-Pacific macroalga Gloiopeltis furcata sensu lato (Gigartinales, Florideophyceae)
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23RD INTERNATIONAL SEAWEED SYMPOSIUM, JEJU
Genetic diversity hotspot of the amphi-Pacific macroalga Gloiopeltis furcata sensu lato (Gigartinales, Florideophyceae) Mi Yeon Yang 1 & Eun Chan Yang 2 & Myung Sook Kim 1 Received: 28 July 2019 / Revised and accepted: 5 December 2019 # Springer Nature B.V. 2020
Abstract Genetic diversity patterns around the North Pacific received attention for marine organisms and have been used to infer biodiversity “hotspots” in the region. We conducted a phylogeographic study of the red alga Gloiopeltis furcata, investigating cryptic species diversity and comparing population genetic structure in the north Pacific. A phylogenetic tree and haplotype networks were constructed on the basis of 201 mitochondrial COI-5P sequences and 149 plastid rbcL sequences from G. furcata specimens. Eight distinct cryptic lineages (A–H) were identified within G. furcata. These lineages showed high genetic diversity and complex geographic distributions. All eight lineages of G. furcata sensu lato were present in the NW Pacific; however, only a single lineage (A) was present in the NE Pacific, suggesting that the NW Pacific is a center of genetic diversity for G. furcata sensu lato. Habitat discontinuities of G. furcata sensu lato in the high rocky intertidal zone may have been responsible for the high level of genetic differentiation of G. furcata sensu lato in the NW Pacific by impeding genetic exchange between adjacent populations. Our phylogenetic diversity suggests that the NW Pacific, especially Jeju Island, was a genetic diversity hotspot involving species diversity of Gloiopeltis. Keywords Cryptic diversity . Gloiopeltis furcata . Rhodophyta . Macroalgae . North Pacific . Phylogeography
Introduction Phylogeographic studies seek to understand how current and historical habitat dynamics influence lineage divergence and species diversity patterns (Hu et al. 2015; López et al. 2017). Most marine habitats have traditionally been thought to be interconnected by gene flow because of a lack of apparent barriers to dispersal (Palumbi 1994). However, a number of studies, particularly of marine macroalgae, have revealed that species could be cryptic due to low morphological complexity (Hu et al. 2011; Montecinos et al. 2012; Leliaert et al. 2018). Indeed, recent phylogeographic studies using red algae in Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10811-019-02017-y) contains supplementary material, which is available to authorized users. * Myung Sook Kim [email protected] 1
Department of Biology and Research Institute for Basic Sciences, Jeju National University, 102 Jejudaehakno, Jeju 63243, South Korea
2
Marine Ecosystem Research Center, Korea Institute of Ocean Science & Technology, Busan 49111, South Korea
non-overlapping geographic regions showed high levels of genetic differentiation (Payo et al. 2013; Yang and Kim 2018), which also occurred in sympatric populations with little habitat heterogeneity or lacking geographic barriers (Tronholm e
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