Asymmetric genetic exchange in the brown seaweed Sargassum fusiforme (Phaeophyceae) driven by oceanic currents

Hu, Zi‐Min; Zhang, Jie; Lopez-Bautista, Juan; Duan, Delin

doi:10.1007/s00227-013-2192-x

Cited by 45 publications

(42 citation statements)

References 44 publications

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“…Phylogeographical analysis of three Sargassum spp. in northwestern Pacific [2,36,43] also showed Sargassum populations could both be structured by Pleistocene isolation and postglacial recolonization associated with current flows (e.g. Kuroshio Current).…”

Section: Discussionmentioning

confidence: 99%

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

et al. 2013

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Southeast Asia has been known as one of the biodiversity hotspots in the world. Repeated glacial cycles during Pleistocene were believed to cause isolation of marine taxa in refugia, resulting in diversification among lineages. Recently, ocean current was also found to be another factor affecting gene flow by restricting larval dispersal in animals. Macroalgae are unique in having mode of reproduction that differs from that of animals. Our study on the phylogeographical pattern of the brown macroalga Sargassum polycystum using nuclear Internal Transcribed Spacer 2 (ITS2), plastidal RuBisCO spacer (Rub spacer) and mitochondrial cytochrome oxidase subunit-III (Cox3) as molecular markers revealed genetic homogeneity across 27 sites in Southeast Asia and western Pacific, in sharp contrast to that revealed from most animal studies. Our data suggested that S. polycystum persisted in single refugium during Pleistocene in a panmixia pattern. Expansion occurred more recently after the Last Glacial Maximum and recolonization of the newly flooded Sunda Shelf could have involved asexual propagation of the species. High dispersal ability through floating fronds carrying developing germlings may also contribute to the low genetic diversity of the species.

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Section: Discussionmentioning

confidence: 99%

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

et al. 2013

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“…Although the characterization of intraspecific diversity and phylogeographic structure is fundamental to the conservation and management of species (Newton, Allnutt, Gillies, Lowe, & Ennos, 1999), a comprehensive attempt has yet to be carried out across the range of S. fusiforme. A recent molecular survey using mitochondrial cox1 revealed that oceanic currents drove asymmetric genetic exchange between S. fusiforme populations in the ANP (Hu, Zhang, Lopez-Bautista, & Duan, 2013), yet the cryptic lineage diversity and evolutionary patterns remain largely unresolved. From a conservation genetic perspective, the failure to survey population genetic structure of S. fusiforme may result in overexploitation or localized extirpation of uncharacterized biodiversity (Hueter, Heupel, Heist, & Keeney, 2005).…”

Section: Introductionmentioning

confidence: 99%

Hidden diversity and phylogeographic history provide conservation insights for the edible seaweed Sargassum fusiforme in the Northwest Pacific

Sun

et al. 2017

Evolutionary Applications

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Understanding the evolutionary processes that have created diversity and the genetic potential of species to adapt to environmental change is an important premise for biodiversity conservation. Herein, we used mitochondrial trnW‐L and cox3 and plastid rbcL‐S data sets to analyze population genetic variation and phylogeographic history of the brown alga Sargassum fusiforme, whose natural resource has been largely exterminated in the Asia–Northwest Pacific in the past decades. Phylogenetic trees and network analysis consistently revealed three major haplotype groups (A, B, and C) in S. fusiforme, with A and B distributed in the Japan‐Pacific coast. Group C consisted of three subgroups (C1, C2, and C3) which were distributed in the Sea of Japan, the Yellow–Bohai Sea, and East China Sea, respectively. Isolation‐with‐migration (IM a) analysis revealed that the three groups diverged approximately during the mid‐Pleistocene (c. 756–1,224 ka). Extended Bayesian skyline plots (EBSP) showed that groups A and B underwent relatively long‐term stable population size despite a subsequent rapid demographic expansion, while subgroups C2 and C3 underwent a sudden expansion at c. 260 ka. FST and AMOVA detected low population‐level genetic variation and high degrees of divergence between groups. The cryptic diversity and phylogeographic patterns found in S. fusiforme not only are essential to understand how environmental shifts and evolutionary processes shaped diversity and distribution of coastal seaweeds but also provide additional insights for conserving and managing seaweed resources and facilitate predictions of their responses to future climate change and habitat loss.

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“…For example, the KC can lead to the admixture of low–latitude tropical and subtropical marine species and maintain high levels of genetic diversity at high latitudes (coral reef: Allen & Werner, ; seagrass: Nakajima et al ., ). The variable interactions of oceanic current systems in the NWP are also evidenced in some co‐distributed marine organisms, which exhibit different or contrasting phylogeographical structure and diversity patterns (Hu et al ., , ).…”

Section: Introductionmentioning

confidence: 99%

“…Oceanic currents are among the most pervasive hydrodynamic features along the world's coastlines and have proved to be an important physical factor in shaping community dynamics, population connectivity and genetic structure in coastal marine systems (Gaylord & Gaines, 2000;Galindo et al, 2006;Hu et al, 2013;Nakajima et al, 2014). On the one hand, oceanic currents can act as gene-exchange corridors for the migration of marine organisms with long-distance dispersal capability and produce genetically homogeneous populations (Mitarai et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Oceanic currents drove population genetic connectivity of the brown alga Sargassum thunbergii in the north‐west Pacific

Gao

et al. 2016

Journal of Biogeography

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Aim Oceanic currents are among the most pervasive hydrodynamic features in shaping community dynamics, population connectivity and phylogeographical structure of intertidal species. Here, we test whether population structure and biogeographical gradients of genetic diversity in the brown alga Sargassum thunbergii are correlated with oceanic currents in the north-west Pacific (NWP).Location North-west Pacific (25.07°N-43.36°N).Methods Nuclear internal transcribed spacer-2 and mitochondrial cox3 sequences were obtained from 835 and 810 individuals of S. thunbergii respectively. Parsimony networks and phylogenetic trees (maximum parsimony and Bayesian inference) were constructed to evaluate phylogeographical structure. Pairwise F ST estimates and analyses of molecular variance (AMOVA) at various hierarchical levels (latitude, longitude, marine provinces, biogeographical basins and zoogeographical zones) were conducted to elucidate population genetic differentiation. migrate software was used to estimate the number of migrants between adjacent populations.Results Several lines of evidence indicate that S. thunbergii is characterized by shallow population structure. Geographical distances do not correlate with population pairwise genetic differentiations. The corridor/stepping-stone model-based coalescent analyses reveal high levels of asymmetric gene flow among S. thunbergii populations, with the numbers of migrants largely corresponding to the directions of oceanic current systems in the NWP. Genetic signatures also indicate that Jeju Island, Korea might act as a transition zone for dispersal of S. thunbergii in the NWP driven by the Kuroshio Current, thus facilitating subsequent transportation northward into the Sea of Japan and the Yellow-Bohai Sea.Main conclusions Population genetic homogeneity in S. thunbergii was mainly structured by oceanic currents rather than palaeoclimatic events. Our study illustrates an important phylogeographical case of how coastal hydrodynamic factors contributed to population connectivity and geographical shifts of genetic diversity for marine organisms without a pelagic stage.

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Asymmetric genetic exchange in the brown seaweed Sargassum fusiforme (Phaeophyceae) driven by oceanic currents

Cited by 45 publications

References 44 publications

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

Hidden diversity and phylogeographic history provide conservation insights for the edible seaweed Sargassum fusiforme in the Northwest Pacific

Oceanic currents drove population genetic connectivity of the brown alga Sargassum thunbergii in the north‐west Pacific

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