Chloroplast phylogeography of a widely distributed mangrove species, Excoecaria agallocha, in the Indo-West Pacific region

Guo, Wuxia; Ng, Wei Lun; Wu, Haidan; Li, Weixi; Zhang, Lei; Qiao, Shouhong; Yang, Xiao‐Yang; Shi, Xianggang; Huang, Yelin

doi:10.1007/s10750-017-3409-7

Cited by 18 publications

(15 citation statements)

References 60 publications

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“…The current study is particularly timely with respect to the increased research on global phylogeography of mangroves in the past several years (e.g. Guo et al, 2018;Tomizawa et al, 2017;Wee et al, 2017;Yang et al, 2017). Our findings emphasize a lack of congruency in genetic structure across mangrove species at the local scale and calls for caution against a generalized interpretation of their genetic patterns.…”

Section: Con Clus Ionsmentioning

confidence: 67%

Genetic structures across a biogeographical barrier reflect dispersal potential of four Southeast Asian mangrove plant species

Wee

Noreen

Ono

et al. 2020

Journal of Biogeography

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Aim Biogeographical barriers restrict the movement of individuals, resulting in population divergence, genetic differentiation, endemism and speciation. Yet, some barriers demonstrate unequal effect across species depending on species dispersal, which manifests in varying genetic structure. We test the hypotheses that the genetic structure of four coastal mangrove species would reflect differences in dispersal potential across the Malay Peninsula, a major biogeographical barrier in the Indo‐West Pacific region. Location East and west coasts of the Malay Peninsula. Taxon Mangrove trees Avicennia alba, Sonneratia alba, Bruguiera gymnorhiza and Rhizophora mucronata. Methods For each species, we characterized genetic structure and gene flow using 7–12 species‐specific nuclear microsatellite markers. We tested for east–west genetic differentiation across the peninsula, a stepping‐stone migration pattern, and assessed the proportion of recent dispersal and direction of historical migration along the Malacca Strait. Results Significant east–west genetic differentiation across the peninsula was observed in A. alba, S. alba and B. gymnorhiza, and the effect was most pronounced for the two species with lower dispersal potential (A. alba, S. alba). In contrast, the two species with higher dispersal potential (B. gymnorhiza and R. mucronata) exhibited much higher proportion of recent inter‐population migration along the Malacca Strait. The signature of historical colonization from refugia in the Andaman Sea (north‐to‐south migration along the Malacca Strait) predominated for A. alba and S. alba. Historical south–north migration predominated for R. mucronata and B. gymnorhiza. Main conclusions This study implicated dispersal potential as a cause of varying mangrove species genetic structure across a biogeographical barrier. The Malay Peninsula functions as a filter to gene flow rather than a barrier. The genetic structure in mangrove species with a higher dispersal potential is more congruent with contemporary gene flow while that of species with a lower dispersal potential reflects historical processes. Our findings hint at the role of dispersal potential as a predictor of gene flow in mangroves.

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Section: Con Clus Ionsmentioning

confidence: 67%

Genetic structures across a biogeographical barrier reflect dispersal potential of four Southeast Asian mangrove plant species

Wee

Noreen

Ono

et al. 2020

Journal of Biogeography

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“…At the species level, genetic diversity estimates of L. littorea (H T = 0.490) and L. racemosa (H T = 0.625) were much lower compared to other mangrove species studied using cpDNA markers, e.g., another non-viviparous Excoecaria agallocha (H T = 0.740; Guo et al, 2018a) and cryptoviviparous mangrove Avicennia germinans (H T = 0.87; Nettel and Dodd, 2007). At the population level, we also found low genetic diversity for both species.…”

Section: Genetic Diversitymentioning

confidence: 82%

Contrasting Phylogeographic Patterns in Lumnitzera Mangroves Across the Indo-West Pacific

Guo

Banerjee

et al. 2021

Front. Plant Sci.

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Mangroves are ecologically important forest communities in tropical and subtropical coasts, the effective management of which requires understanding of their phylogeographic patterns. However, these patterns often vary among different species, even among ecologically similar taxa or congeneric species. Here, we investigated the levels and patterns of genetic variation within Lumnitzera consisting of two species (L. racemosa and L. littorea) with nearly sympatric ranges across the Indo-West Pacific (IWP) region by sequencing three chloroplast DNA regions (for both species) and genotyping 11 nuclear microsatellite loci (for L. littorea). Consistent with findings in studies on other mangrove species, we found that both L. racemosa and L. littorea showed relatively high genetic variation among populations but low genetic variation within populations. Haplotype network and genetic clustering analyses indicated two well-differentiated clades in both L. racemosa and L. littorea. The relationship between geographic and genetic distances and divergence time estimates of the haplotypes indicated that limited dispersal ability of the propagules, emergence of land barriers during ancient sea-level changes, and contemporary oceanic circulation pattern in the IWP influenced the current population structure of the two species. However, the position of genetic break was found to vary between the two species: in L. racemosa, strong divergence was observed between populations from the Indian Ocean and the Pacific Ocean possibly due to land barrier effect of the Malay Peninsula; in L. littorea, the phylogeographic pattern was created by a more eastward genetic break along the biogeographic barrier identified as the Huxley’s line. Overall, our findings strongly supported previous hypothesis of mangrove species divergence and revealed that the two Lumnitzera species have different phylogeographic patterns despite their close genetic relationship and similar current geographic distribution. The findings also provided references for the management of Lumnitzera mangroves, especially for the threatened L. littorea.

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“…This hypothetical dispersal pattern is in stark contrast to the intuitive notion, based on contemporary coastal configurations, that the species spread along the Indochinese peninsular coasts from Southeast Asia to southern and then northern Vietnam, and reached its current ranges in China, first in Guangxi and then Guangdong, and lastly, Hainan. Interestingly, molecular genetic studies of mangrove species on the coast of Vietnam also showed significant genetic differentiation between the northern and southern populations, supporting the presence of gene flow barriers along the coast (Guo et al, 2018;Kado et al, 2004).…”

Section: Phylogenetic Relationships and Colonization History Of Chinese Fejervarya Cancrivoramentioning

confidence: 88%

Population genetic patterns of a mangrove‐associated frog reveal its colonization history and habitat connectivity

Zheng

Zhang

et al. 2021

Diversity and Distributions

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Chloroplast phylogeography of a widely distributed mangrove species, Excoecaria agallocha, in the Indo-West Pacific region

Cited by 18 publications

References 60 publications

Genetic structures across a biogeographical barrier reflect dispersal potential of four Southeast Asian mangrove plant species

Genetic structures across a biogeographical barrier reflect dispersal potential of four Southeast Asian mangrove plant species

Contrasting Phylogeographic Patterns in Lumnitzera Mangroves Across the Indo-West Pacific

Population genetic patterns of a mangrove‐associated frog reveal its colonization history and habitat connectivity

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