Phylogeography of the freshwater bivalve genus Ensidens (Unionidae) in Thailand

Muanta, Sukanya; Jeratthitikul, Ekgachai; Panha, Somsak; Prasankok, Pongpun

doi:10.1093/mollus/eyz013

Cited by 10 publications

(19 citation statements)

References 45 publications

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“…The range of this monotypic genus corresponds to the Khorat Plateau, a putative evolutionary hotspot at the Middle Mekong Basin, that presents high levels of endemism in freshwater animals, e.g. bivalves [26][27][28] , fish 54 , and softshell turtles 55,56 . In summary, the Indochinellini contains three genera (Indochinella, 4,24 , Indochinella pugio daweiensis 6 .…”

Section: Eastern Edge Of the Indian Subregion The Biogeographic Bounmentioning

confidence: 99%

New freshwater mussel taxa discoveries clarify biogeographic division of Southeast Asia

Bolotov

Konopleva

Vikhrev

et al. 2020

Sci Rep

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While a growing body of modern phylogenetic research reveals that the Western indochina represents a separate biogeographic subregion having a largely endemic freshwater fauna, the boundaries of this subregion are still unclear. We use freshwater mussels (Unionidae) as a model to reconstruct spatial patterns of freshwater biogeographic divides throughout Asia. Here, we present an updated freshwater biogeographic division of mainland Southeast Asia and describe 12 species and 4 genera of freshwater mussels new to science. We show that the Isthmus of Kra represents a significant southern biogeographic barrier between freshwater mussel faunas of the Western indochina and Sundaland subregions, while the Indian and Western Indochina subregions are separated by the Naga Hills, Chin Hills, and Rakhine Yoma mountain ranges. Our findings highlight that the freshwater bivalve fauna of Southeast Asia primarily originated within three evolutionary hotspots (Western Indochina, Sundaland, and east Asian) supplemented by ancient immigrants from the indian Subcontinent. Freshwater mussels (Unionida) are an economically and environmentally important group of aquatic animals having a broad distribution on all continents except Antarctica 1,2. Southeast Asia houses one of the richest endemic faunas of freshwater mussels globally 3-7. Unfortunately, freshwater mussels are among the most endangered animal groups at the global scale, with numerous local extinctions triggered by multiple anthropogenic impacts and climate changes 8-11. Human-mediated degradation of natural habitats, e.g. water pollution, river damming, and irrigation practices, appears to be the most influential factor causing the decline and local extinctions of freshwater mussels 11-13. It was shown that even a prehistoric decline in freshwater mussels corresponds to the early development of agricultural techniques 14. Alien species may represent a significant threat to native freshwater mussel assemblages in Southeast Asia 13 and other regions 15. For example, the tropical lineage of Sinanodonta woodiana (Lea, 1834) is widely spread throughout Malaysia, the Indonesian Archipelago, and the Philippines 16-18 , while the temperate lineage of this taxon was found in Myanmar 19. Recent advances in mitogenomic 20 and multi-locus nuclear 21 phylogenetic modeling reveal that two widespread Southeast Asian subfamilies of the Unionidae, i.e. Pseudodontinae 22 and Rectidentinae 22,23 , represent tribes within the monophyletic Gonideinae. The genus-and species-level taxonomy of freshwater mussels in Southeast Asia is still poorly known 3 , but several integrative studies performed in Myanmar, Thailand, Laos, and Malaysia have recently improved our knowledge about the diversity and biogeographic patterns in the region.

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Section: Eastern Edge Of the Indian Subregion The Biogeographic Bounmentioning

confidence: 99%

New freshwater mussel taxa discoveries clarify biogeographic division of Southeast Asia

Bolotov

Konopleva

Vikhrev

et al. 2020

Sci Rep

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“…The tribes Contradentini and Rectidentini are an exclusively South-east Asian radiation, and they are common and diverse in the region's freshwater communities. Portions of this clade have received considerable molecular systematic attention in recent years, and our appreciation for the phylogeny, distribution, and diversity of this radiation has improved dramatically Graf 2013, 2015;Bolotov et al 2017aBolotov et al , 2017bBolotov et al , 2018Bolotov et al , 2019bBolotov et al , 2020Konopleva et al 2017Konopleva et al , 2019aKonopleva et al , 2019bLopes-Lima et al 2017;Zieritz et al 2018aZieritz et al , 2018bZieritz et al , 2020Pfeiffer et al 2018aPfeiffer et al , 2019Jeratthitikul et al 2019;Muanta et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Taxonomic revision of a radiation of South-east Asian freshwater mussels (Unionidae : Gonideinae : Contradentini+Rectidentini)

et al. 2021

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The tribes Contradentini and Rectidentini (Unionidae) comprise a diverse clade of freshwater mussels endemic to South-east Asia. Our understanding of the diversity and phylogeny of this radiation has improved dramatically in recent years, but this systematic transformation has not yet benefited from comprehensive museum sampling or phylogenomic methods. A synthetic taxonomic revision of the Contradentini+Rectidentini that leverages these useful and accessible methods is needed. We set out to (1) generate a phylogenomic reconstruction of the supraspecific relationships of the Contradentini+Rectidentini using anchored hybrid enrichment, (2) revise the taxonomy and geographic boundaries of the generic and species-level diversity of the radiation, and (3) identify patterns of freshwater mussel diversity and distribution in this clade and discuss the processes that may have precipitated them. Our phylogenomic reconstruction using over 1600 loci, with a total alignment length of over a half a million nucleotides, recovers a well supported phylogeny of the clade that resolves four independent multispecies radiations endemic to the Mekong drainage. We examined, digitised, and imaged 1837 records from 15 natural history museums that provided the necessary data to document the morphological variation and geographic distributions of the focal taxa. We also analysed 860 COI sequences, 519 of which were generated in this study, to better understand the species boundaries and geographic distributions of the recovered clades. We recognise 54 valid species in the tribes Contradentini and Rectidentini, including 9 described herein as new to science. Out of this revision emerged several interesting biogeographic patterns that appear to have resulted from recent stream capture, historical confluence, and intradrainage barriers to dispersal. We hypothesise that these phenomena shaped the diversity and distribution of the Contradentini+Rectidentini, contributing to the formation of several characteristic freshwater mussel provinces in South-east Asia.

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“…Several recent phylogenetic studies have substantially revised the systematics of various freshwater mussel taxa from the Mekong basin, especially among representatives of the tribes Indochinellini (e.g. Scabies Haas, 1911 4 , 5 , Harmandia Rochebrune, 1882 4 , and Unionetta Haas, 1955 4 ), Rectidentini ( Ensidens Frierson, 1911 6 , 7 , and Hyriopsis Conrad, 1853 3 , 7 , 8 ), and Contradentini ( Contradens Haas, 1911 7 , 9 – 11 ). Less taxonomic focus has been paid to the most species-rich tribe in Southeast Asia, the Pseudodontini.…”

Section: Introductionmentioning

confidence: 99%

New freshwater mussels from two Southeast Asian genera Bineurus and Thaiconcha (Pseudodontini, Gonideinae, Unionidae)

Konopleva

Bolotov

Pfeiffer

et al. 2021

Sci Rep

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The Mekong and Chao Phraya rivers harbor a species-rich freshwater mussel assemblage containing a large radiation of the Pseudodontini species. Members of the genera Bineurus Simpson 1900 and Thaiconcha Bolotov et al., 2020 primarily inhabit small and medium-sized tributaries of these rivers. Here, we present an integrative taxonomic review of these genus-level clades. We show that Bineurus contains four species: B. mouhotii (Lea, 1863), B. exilis (Morelet, 1866) stat. rev., B. anodontinum (Rochebrune, 1882) stat. rev., and B. loeiensis sp. nov. In its turn, Thaiconcha comprises three species: T. callifera (Martens, 1860), T. munelliptica sp. nov., and T. thaiensis sp. nov. Two species, Pseudodon ovalis Morlet, 1889 and P. thomsoni Morlet, 1884, are considered here as questionable taxa. These findings further highlight that Southeast Asia represents a significant evolutionary hotspot of freshwater mussels, which requires further international collaborative research and conservation efforts.

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Phylogeography of the freshwater bivalve genus Ensidens (Unionidae) in Thailand

Cited by 10 publications

References 45 publications

New freshwater mussel taxa discoveries clarify biogeographic division of Southeast Asia

New freshwater mussel taxa discoveries clarify biogeographic division of Southeast Asia

Taxonomic revision of a radiation of South-east Asian freshwater mussels (Unionidae : Gonideinae : Contradentini+Rectidentini)

New freshwater mussels from two Southeast Asian genera Bineurus and Thaiconcha (Pseudodontini, Gonideinae, Unionidae)

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