Evolutionary genetics of mangroves: continental drift to recent climate change

Dodd, Richard S.; Rafii, Zara A.

doi:10.1007/s00468-001-0142-6

Cited by 47 publications

(40 citation statements)

References 32 publications

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“…Assessments of genetic diversity have been made for New World Rhizophora (Rosero-Galindo et al 2002;Proffitt and Travis unpublished data). Similar measurements have been made for other mangrove species (CastilloCardenas et al 2005;Ceron-Souza and Cardenas-Henao 2005;Dodd and Afzal-Rafil 2002;Duke et al 1998;Ge and Sun 1999;Maguire et al 2000).…”

Section: Introductionsupporting

confidence: 78%

Red Mangrove Seedling Survival, Growth, and Reproduction: Effects of Environment and Maternal Genotype

Travis

2010

Estuaries and Coasts

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An adequate understanding of the nature and extent of response to stressors and resources by marine foundation plant species requires study of local adaptation and plasticity in traits. Analyses of variation among genotypes in growth and morphology and genotype × environment interactions are necessary for restoration in, for example, different combinations of tide, soil, and salinity regimes, and for assessing how foundation plant species will respond to global climate change. We conducted a field experiment to assess differences in responses among 86 half-sibling (same maternal tree) seedling families of the red mangrove (Rhizophora mangle) to different environmental conditions of hydrology imposed at low-and high-intertidal settings. At 3 years, Rhizophora survival and growth varied with maternal tree genotype, elevation, and genotype × elevation. This effect was independent of size of propagules at planting. Growth also differed among the five islands planted, a main effect that is a composite of a number of microenvironmental differences stemming from island size and shape, proximity to passes (and thus fetch), and island slope. Significant genotype × island interactions for some response variables further support the hypothesis that seedlings of different maternal genotypes can perform very differently under various suites of environmental conditions. Planted seedlings reproduced at an early age, and at 3 years there were differences in reproductive output among genotypes but not an overall mean difference between plants at low or high elevation. Whether our results show adaptation to local conditions or differences in plasticity among genotypes will require further study as the plants mature further to demonstrate fitness differences. However, either adaptation or plasticity provides a basis for maintenance of Rhizophora dominance over a wider range of environmental conditions and may be important for adaptation to conditions that will vary with global climate change.

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Section: Introductionsupporting

confidence: 78%

Red Mangrove Seedling Survival, Growth, and Reproduction: Effects of Environment and Maternal Genotype

Travis

2010

Estuaries and Coasts

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“…Perhaps sea level changes during this epoch drove the genetic differentiation between populations from these geographic areas. Dispersal of seeds via sea currents plays an important role in determining the extant distribution and genetic composition of mangrove species within and among different oceanic regions (Duke, 1995; Dodd and Rafii, 2002; Triest, 2008). During glacial periods, global sea levels dropped and exposed the bulk of the shallow seabed in the SCS, forming temporary land bridges connecting mainland Asia with the three Sunda Islands (Sumatra, Borneo and Java; Voris, 2000; Sathiamurthy and Voris, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Like other organisms inhabiting tropical marine or intertidal zones, they exhibit a strong association of genetic divergence with geographical breaks (Duke, 1995; Dodd and Rafii, 2002; Triest, 2008). Mangrove species are split into two main biogeographic regions of species diversity, the Atlantic-East Pacific (AEP) and the Indo-West Pacific (IWP; Tomlinson, 1986; Duke et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Ancient Geographical Barriers Drive Differentiation among Sonneratia caseolaris Populations and Recent Divergence from S. lanceolata

et al. 2016

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Glacial vicariance is thought to influence population dynamics and speciation of many marine organisms. Mangroves, a plant group inhabiting intertidal zones, were also profoundly influenced by Pleistocene glaciations. In this study, we investigated phylogeographic patterns of a widespread mangrove species Sonneratia caseolaris and a narrowly distributed, closely related species S. lanceolata to infer their divergence histories and related it to historical geological events. We sequenced two chloroplast fragments and five nuclear genes for one population of S. lanceolata and 12 populations of S. caseolaris across the Indo-West Pacific (IWP) region to evaluate genetic differentiation and divergence time among them. Phylogenetic analysis based on sequences of nuclear ribosomal internal transcribed spacer and a nuclear gene rpl9 for all Sonneratia species indicate that S. lanceolata individuals are nested within S. caseolaris. We found strong genetic structure among geographic regions (South China Sea, the Indian Ocean, and eastern Australia) inhabited by S. caseolaris. We estimated that divergence between the Indo-Malesia and Australasia populations occurred 4.035 million years ago (MYA), prior to the onset of Pleistocene. BARRIERS analysis suggested that complex geographic features in the IWP region had largely shaped the phylogeographic patterns of S. caseolaris. Furthermore, haplotype analyses provided convincing evidence for secondary contact of the South China Sea and the Indian Ocean lineages at the Indo-Pacific boundary. Demographic history inference under isolation and migration (IM) model detected substantial gene flow from the Sri Lanka populations to the populations in the Java Island. Moreover, multi-locus sequence analysis indicated that S. lanceolata was most closely related to the Indian Ocean populations of S. caseolaris and the divergence time between them was 2.057 MYA, coinciding with the onset of the Pleistocene glaciation. Our results suggest that geographic isolation driven by the Pleistocene ice age resulted in the recent origin of S. lanceolata.

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“…Unlike terrestrial plants, most mangrove species have water-dispersed seedlings that can float for an extended period of time [4], which may play a role in the geographical distribution and population dynamics of mangrove plants. However, traditional views have proposed that large landmasses could halt propogule dispersal, especially during glaciation, resulting in the genetic structure within mangrove species [12–14]. Many phylogeographical studies have linked genetic divergence with glacial vicariance in many mangrove species across the Indo-West-Pacific (IWP) region [15–24].…”

Section: Introductionmentioning

confidence: 99%

“…However, in the case of Rhizophora mangle [29] and R. mucronata [23], ocean circulations, similar to land barriers, were proposed to play an important role in preventing gene flow and maintaining high genetic divergence. It has been suggested that sea-drift long-distance dispersal (LDD) is less effective than previously thought [12]. Thus, whether substantial genetic exchanges exist among different oceanic regions during the Pleistocene interglacial periods remains elusive and requires further confirmation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pleistocene sea-level fluctuations on mangrove population dynamics: a lesson from Sonneratia alba

Yang

et al. 2017

BMC Evol Biol

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BackgroundA large-scale systematical investigation of the influence of Pleistocene climate oscillation on mangrove population dynamics could enrich our knowledge about the evolutionary history during times of historical climate change, which in turn may provide important information for their conservation.ResultsIn this study, phylogeography of a mangrove tree Sonneratia alba was studied by sequencing three chloroplast fragments and seven nuclear genes. A low level of genetic diversity at the population level was detected across its range, especially at the range margins, which was mainly attributed to the steep sea-level drop and associated climate fluctuations during the Pleistocene glacial periods. Extremely small effective population size (Ne) was inferred in populations from both eastern and western Malay Peninsula (44 and 396, respectively), mirroring the fragility of mangrove plants and their paucity of robustness against future climate perturbations and human activity. Two major genetic lineages of high divergence were identified in the two mangrove biodiversity centres: the Indo-Malesia and Australasia regions. The estimated splitting time between these two lineages was 3.153 million year ago (MYA), suggesting a role for pre-Pleistocene events in shaping the major diversity patterns of mangrove species. Within the Indo-Malesia region, a subdivision was implicated between the South China Sea (SCS) and the remaining area with a divergence time of 1.874 MYA, corresponding to glacial vicariance when the emerged Sunda Shelf halted genetic exchange between the western and eastern coasts of the Malay Peninsula during Pleistocene sea-level drops. Notably, genetic admixture was observed in populations at the boundary regions, especially in the two populations near the Malacca Strait, indicating secondary contact between divergent lineages during interglacial periods. These interregional genetic exchanges provided ample opportunity for the re-use of standing genetic variation, which could facilitate mangrove establishment and adaptation in new habitats, especially in the context of global climate changes.ConclusionPhylogeogrpahic analysis in this study reveal that Pleistocene sea-level fluctuations had profound influence on population differentiation of the mangrove tree S. alba. Our study highlights the fragility of mangrove plants and offers a guide for the conservation of coastal mangrove communities experiencing ongoing changes in sea-level.Electronic supplementary materialThe online version of this article (doi:10.1186/s12862-016-0849-z) contains supplementary material, which is available to authorized users.

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Evolutionary genetics of mangroves: continental drift to recent climate change

Cited by 47 publications

References 32 publications

Red Mangrove Seedling Survival, Growth, and Reproduction: Effects of Environment and Maternal Genotype

Red Mangrove Seedling Survival, Growth, and Reproduction: Effects of Environment and Maternal Genotype

Ancient Geographical Barriers Drive Differentiation among Sonneratia caseolaris Populations and Recent Divergence from S. lanceolata

Effects of Pleistocene sea-level fluctuations on mangrove population dynamics: a lesson from Sonneratia alba

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