Genetic population structure of the mangrove snails Littoraria subvittata and L. pallescens in the Western Indian Ocean

Nehemia, Alex; Ngendu, Yamungu; Kochzius, Marc

doi:10.1016/j.jembe.2019.03.005

Cited by 12 publications

(9 citation statements)

References 47 publications

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“…Similar differentiation between the East African mainland and Madagascar was also found in other coral reef taxa, such as the stony coral S. hystrix (van der Ven et al 2021), anemonefish Amphiprion akallopisos (Huyghe and Kochzius 2018) and Octopus cyanea (Van Nieuwenhove et al 2019). Also mangrove taxa showed congruent patterns of differentiation, such as the mangrove tree Rhizophora mucronata (Triest et al 2021), snails Terebralia palustris (Ratsimbazafy and Kochzius 2018), Littoraria subvittata and L. pallescens (Nehemia et al 2019), as well as the giant mud crab Scylla serrata (Rumisha et al 2017). However, in this study there is evidence for long-distance larval dispersal for A. tenuis in the NMC region, with exchange through the Mozambique Channel between northern Mozambique (Va, Pe, Na) and northern Madagascar (Ra, Nb).…”

Section: Genetic Connectivity In Northern Madagascar and The East Afr...supporting

confidence: 61%

“…This pattern is supported by research on the stony coral Platgyra daedalea, in which Bazaruto (in this study Vi) and Inhaca (in this study In) were clustered together and separate from reefs in northern Mozambique (Montoya-Maya et al 2016), as well as by a studies on Acropora austera, in which panmixia was found between Bazaruto and Inhaca, as well as between some of the Mozambique and South African sites (Macdonald et al 2011;Montoya-Maya et al 2016). Also, mangrove taxa, such as the mangrove tree R. mucronata (Triest et al 2021), as well as the snails L. subvittata (Nehemia et al 2019) and T. palustris (Ratsimbazafy and Kochzius 2018), show a genetic separation of population in southern Mozambique from other regions in the WIO.…”

Section: Substructure Of Reefs In the Southern Mozambique Channelsupporting

confidence: 59%

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Large-scale biogeographic patterns are reflected in the genetic structure of a broadcast spawning stony coral

2022

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Countries in the Western Indian Ocean (WIO) and along the Red Sea are particularly vulnerable to coral reef degradation, and understanding the degree of connectivity among coral reefs is a first step toward efficient conservation. The aim of this study is to investigate the genetic diversity, population structure and connectivity patterns of the broadcast spawning coral Acropora tenuis, first at a large scale comparing the Red Sea and the WIO, and second at a smaller scale comparing sites within the WIO. In total 689 individual A. tenuis colonies were sampled on 28 locations in Saudi Arabia, Kenya, Tanzania, Mozambique and Madagascar and analysed with seven microsatellite markers. The sample site in the Red Sea was found to be differentiated from all other sites in the WIO, which confirms the hypothesised genetic break. High differentiation was found between the African mainland and Madagascar and within Madagascar. However, there is evidence for long-distance larval dispersal for A. tenuis in the North Mozambique Channel region, with exchange between northern Mozambique and northern Madagascar. The sites in the southwest of Madagascar show mixing with sites in northern Madagascar, as well as exchange with sites in northern Mozambique and Tanzania. Southern Mozambique forms a separate group in Bayesian clustering. High genetic connectivity was found for most sites along the East African mainland coast, with no indication for strict genetic barriers. These results support biophysical modelling studies, which propose Tanzania as a seeding source of larvae for downstream Kenya. These patterns of high genetic connectivity combined with contemporary dispersal barriers can be explained by the long larval duration of A. tenuis and the prevailing northbound East African Coast Current that facilitates higher genetic connectivity along the northern East African Coast, while eddies in the Mozambique Channel are causing larval retention in southern Mozambique and Madagascar.

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Section: Genetic Connectivity In Northern Madagascar and The East Afr...supporting

confidence: 61%

Section: Substructure Of Reefs In the Southern Mozambique Channelsupporting

confidence: 59%

Large-scale biogeographic patterns are reflected in the genetic structure of a broadcast spawning stony coral

2022

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“…Genetic diversity analysis based on mtDNA and ITS-2 showed greater diversity within populations and numerous shared sequences among locations. Similar patterns have been reported for littorinids, with both direct and planktotrophic development [32][33][34], and seems to be caused by high gene flow among populations and the large littorinid population sizes.…”

Section: Intra-populational Diversity and Microgeographic Variationsupporting

confidence: 80%

“…Organisms from such environments are constantly exposed to factors that test their physiological tolerance limits; therefore, they tend to respond more rapidly to climate change via several mechanisms, such as altering their geographical distribution ranges, for instance[14,84,85]. Thus, a species sensitive to climatic fluctuation, such as L. flava, could have extended its range into the Brazilian coast in response to the progressive warming, following the LGM, a process that would have involved serial bottleneck events.Such scenarios have already been suggested for other littorinids[32][33][34]86], and would explain many of our results, such as the neutrality test results, MSN topology, and paleodistribution and coalescent simulations[87][88][89]. Nonetheless, the fossil record for littorinids from Brazil is scarce and unsuitable for testing this hypothesis.…”

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confidence: 57%

Genome-wide Assessment Elucidates Connectivity and the Evolutionary History of the Highly Dispersive Marine Invertebrate Littoraria Flava (Littorinidae:Gastropoda)

Cortez

Amaral

Sobral‐Souza

et al. 2020

Preprint

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Background: An important goal of population genetics studies in marine ecosystems is understanding how connectivity patterns, both spatial and temporal, are influenced by historical and evolutionary factors. When it comes to dispersion and connectivity in marine ecosystems, the role of historical and evolutionary factors over population dynamics andstructure still remains enigmatic. We evaluated the demographic history and population structure of Littoraria flava, a highly dispersive and widely distributed marine gastropod on the Brazilian intertidal zone, to predict the effects of such factors on intrapopulation divergence. To test the hypotheses that (1) the species has historically high levels of geneflow on a macrogeographic spatial scale and (2) the species distribution in rocky shores consists of subpopulations due to high degrees of environmental heterogeneity, we collected specimens along the Brazilian coastline and combined different sets of genetic markers (mitochondrial DNA, nuclear internal transcribed spacer 2, and single nucleotide polymorphisms) with niche-based modeling to predict species paleodistribution.Results: Low genetic structure was observed along the coastline, and all clustering and migration analyses supported the high gene flow over long distances hypothesis (> 3,000 km). Three genetic clusters were identified by the assignment test, each mostly composed of individuals from the three sampled regions. No fine-scale variation was observed for any location. The neutrality tests and the haplotype networks suggest that L. flava had experienced population bottleneck followed by population expansion. Both paleodistribution and coalescent simulations highlight that expansion events occurred in the Southeastern coastline during the Pleistocene interglacial cycles (21 kya).Conclusions: This is the first study on the South American coast that highlights the demographic history on a marine gastropod based on genomic markers associated with niche modelling. We found that climatic changes since the interglacial periods are potentially relevant drivers for the species distribution in the past. Our findings could enhance the understanding of the population dynamics under an evolutionary view for widely distributed non-model marine organisms.

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“…However, because information on the genetic stock structure of giant tiger prawns in Tanzania is currently limited, there is a chance that the three demarcated fishing zones do not correspond to the genetic stock structure of giant tiger prawns. Available data focuses primarily on the genetic stock structures of the Indian prawns (Fenneropenaeus indicus), crabs, mangrove snails, and other marine fauna from Tanzania (Mwakosya et al, 2018;Nehemia et al, 2017Nehemia et al, , 2019Otwoma & Kochzius, 2016;Rumisha et al, 2018). The only available study on giant tiger prawns was primarily concerned with the impact of trace metal pollution on genetic connectivity, so samples were drawn primarily from pollution hotspots rather than prawn fishing grounds in the three demarcated zones (Rumisha, Leermakers, et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania

Rumisha

Kochzius

2022

Fisheries Management Eco

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Tanzania demarcated three prawn fishing zones along its coast to spread fishing pressure and help the prawn fishery to recover. However, it is unknown whether the demarcated zones correspond to the genetic stock structure of the world's most commercially important prawn, the giant tiger prawn (Penaeus monodon). Thus, this study used partial mitochondrial control region sequences (534 base pairs) to test the hypotheses that (1) giant tiger prawns in Tanzania's demarcated prawn fishing zones are a single stock and (2) the giant tiger prawns on the Tanzanian coast experienced a recent demographic expansion. The sequences showed high haplotype diversity (h = 0.998-1.0) and low nucleotide diversity (θ π = 1.89%-2.24%). The neutrality test and mismatch analysis showed that the hypothesis of recent demographic expansion could not be rejected. The analysis of molecular variance revealed low and insignificant fixation indices between the zones (F ST = 0.00025, p > 0.05; Φ ST = −0.00027, p > 0.05), suggesting that the three demarcated fishing zones constitute a single stock and that fishers may be targeting the same stock. Furthermore, it was discovered that Zone 2 has the potential to replenish depleted areas; thus, it should be prioritised in future conservation planning.

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Genetic population structure of the mangrove snails Littoraria subvittata and L. pallescens in the Western Indian Ocean

Cited by 12 publications

References 47 publications

Large-scale biogeographic patterns are reflected in the genetic structure of a broadcast spawning stony coral

Large-scale biogeographic patterns are reflected in the genetic structure of a broadcast spawning stony coral

Genome-wide Assessment Elucidates Connectivity and the Evolutionary History of the Highly Dispersive Marine Invertebrate Littoraria Flava (Littorinidae:Gastropoda)

Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania

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