V. Tu Do

The Institute Of Ecology and Biological Resources · Department of Aquatic Ecology

The accumulation of information on the geographical distribution range, genetic structure, and host utilization of the symbiont is important for studying how the symbiont spreads its distribution. Pseudocladophora conchopheria is a green alga that grows on the shells of intertidal gastropods distributed in the Japanese Archipelago, the Ryukyu Archi...

The paper presents results on tree snails based on samples collected from various parts of Vietnam during the period of 2008–2022. As a result, 14 Amphidromus species were recorded, which increased the diversity of the genus in Vietnam to a total of 27 species. Four species were new country records including Amphidromus atricallosus perakensis, Amp...

Our recent surveys in North Vietnam found three species of the potamid genus Chinapotamon Dai & Naiyanetr, 1994. Two species may be identified as species described from Southern China, C. depressum (Dai, Song, Li & Liang, 1980) and C. pusillum (Song, 1984), and one species is new to science. The new species can be distinguished from other congeners...

Understanding the method and history of introduction in non-native species are essential for conservation biology, especially in regions like Japan that have a long history of human activity. Bradybaena similaris is a circumtropical land snail that is considered a non-native species from Southeast Asia or East Asia to Japan, which was believed to b...

The basic knowledge of freshwater bivalves in the Unionida in some regions of the world is still limited, hindering potential conservation efforts, including in Vietnam. A subset of these mussels, the freshwater bivalve tribe Anodontini, is especially difficult to properly identify morphologically due to intraspecific shell similarity. This study a...

The proliferation of genomic sequencing approaches has significantly impacted the field of phylogenetics. Target capture approaches provide a cost-effective, fast and easily applied strategy for phylogenetic inference of non-model organisms. However, several existing target capture processing pipelines are incapable of incorporating whole genome se...

East Asia, specifically the Japanese Archipelago, is a biodiversity hotspot of both vertebrates and invertebrates. Mollusks represent a burst of species diversity in this region due to the effects of biotic and abiotic factors on their morphological traits, such as shell shape and size. However, the evolutionary history of terrestrial slugs in East...

Fossils provide important insight into our understanding of phylogenetic history by serving as calibration points for divergence time estimation. However, uncertainties in the fossil record due to parallel evolution and convergent evolution can critically affect estimates of node ages. Here, we compare and contrast estimates of phylogenetic diverge...

Freshwater mussels belonging to the genus Cristaria Schumacher, 1817 (Bivalvia: Unionidae) are widespread from Mongolia to Indochina while the range of one species, C. plicata (Leach, 1814), covers two biogeographic subregions, i.e., East Asian (Amur River to Vietnam) and Sundaland (Mekong River basin). We present here a taxonomic revision of the n...

The proliferation of genomic sequencing approaches has significantly impacted the field of phylogenetics. Target capture approaches provide a cost-effective, fast, and easily applied strategy for phylogenetic inference of non-model organisms. However, many existing pipelines used to create phylogenomic datasets from target capture data are incapabl...

Based on recently collected material and records in the literature, 14 species of fiddler crabs (Crustacea: Ocypodidae: Gelasiminae) are reported from Vietnam. DNA barcoding analyses using the mitochondrial gene COI (cytochrome c oxidase subunit I) was performed to identify examined materials and their precise distributional range. Thirteen species...

The proliferation of genomic sequencing approaches has significantly impacted the field of phylogenetics. Target capture approaches provide a cost-effective, fast, and easily applied strategy for phylogenetic inference of non-model organisms. However, many existing pipelines used to create phylogenomic datasets from target capture data are incapabl...

Accurate species identification is of primary importance in ecology and evolutionary biology. For a long time, the unionid mussels Beringiana and Sinanodonta have puzzled researchers trying to unravel their diversity because of their poorly discernible morphologies. A recent study conducted species delineation of unionid mussels based on mitochondr...

Revealing the species and lineage diversity of a taxon is important for many biological studies of wildlife. In recent decades, DNA-based approaches have been widely utilised to elucidate the diversity of taxa, especially those that are difficult to distinguish based on morphological traits. This study focused on freshwater clams (Sphaeriidae) in J...

The cover image is based on the Viewpoint A global agenda for advancing freshwater biodiversity research by Alain Maasri et al., https://doi.org/10.1111/ele.13931. Image Credit: Solvin Zankl. image

The Ryukyu Islands, an island chain in southwestern Japan, originated from land masses that separated from the Eurasian continent due to the formation of sea barriers about 1.55 million years ago. In this study, we investigated the phylogenetic relationships of the operculate land snail genus Cyclophorus (Caenogastropoda: Cyclophoridae) in the Ryuk...

VIETBIO [Innovative approaches to biodiversity discovery and characterisation in Vietnam] is a bilateral German-Vietnamese research and capacity building project focusing on the development and transfer of new methods and technology towards an integrated biodiversity discovery and monitoring system for Vietnam. Dedicated field training and testing...

The freshwater shrimp species Caridina cucphuongensis (family Atyidae) was poorly described by Dang (1980). Moreover, the taxonomic status of this species is hard to verify as the types have been lost. This study provides a redescription of the species and designation of a neotype specimen. The Caridina cucphuongensis Dang, 1980 is characterized by...

To clarify the effect of niche conservatism on evolutionary history, we focused on freshwater snails, which have different ecological and phylogenetic properties from previously tested taxa. We conducted a phylogenetic analysis using 750 lymnaeid individuals from 357 sites of eleven Radix species. Then, we estimated the ancestral distribution using...

Global freshwater biodiversity is declining dramatically, and meeting the challenges of this crisis requires bold goals and the mobilisation of substantial resources. While the reasons are varied, investments in both research and conservation of freshwater biodiversity lag far behind those in the terrestrial and marine realms. Inspired by a global...

The research on freshwater shrimps of Atyidae is very few in Vietnam. Our recent surveys throughout the country obtained Caridina typus H. Milne Edwards, 1837 in a number of islands and coastal areas. It is the first report of this species in Vietnam. The species characterized by short rostrum, reaching near to end of the basal segment, or sometime...

Freshwater shrimp of the family Atyidae De Haan, 1849 have been studied in Vietnam for more than a century. A total of 24 species of atyid shrimps from the genera Caridina H. Milne Edwards, 1837, Neocaridina Kubo, 1938, Atyopsis Chace, 1983 have been recorded from Vietnam. With 22 species, the majority are from the genus Caridina. In 2013, Karge an...

A new species of atyid freshwater shrimp is described from two caves of Bac Kan Province, Northeast Vietnam, namely Caridina namdat sp. nov. This species can be distinguished from its congeners by a suite of morphological characters such as reduced eyes with short eyestalk, very short and unarmed rostrum, slender second pereiopod, elongated endopod...

The taxonomy of species in the caenogastropod genus Sinotaia (Viviparidae: Bellamyinae) has been a complex and controversial issue since the 19th century. Sinotaia quadrata, the type species of Sinotaia, comprises many named forms and transitions between them, and the taxonomic validity of some species similar to S. quadrata also requires clarifica...

With the biodiversity crisis continuing unchecked, we need to establish levels and drivers of extinction risk, and reassessments over time, to effectively allocate conservation resources and track progress towards global conservation targets. Given that threat appears particularly high in freshwaters, we assessed the extinction risk of 1428 randoml...

Freshwater biodiversity is declining dramatically, and the current biodiversity crisis requires defining bold goals and mobilizing substantial resources to meet the challenges. While the reasons are varied, both research and conservation of freshwater biodiversity lag far behind efforts in the terrestrial and marine realms. We identify fifteen pres...

Freshwater biodiversity is declining dramatically, and the current biodiversity crisis requires defining bold goals and mobilizing substantial resources to meet the challenges. While the reasons are varied, both research and conservation of freshwater biodiversity lag far behind efforts in the terrestrial and marine realms. We identify fifteen pres...

The first stygobitic species of atyid freshwater shrimps from Vietnam is described from Cuc Phuong National Park, Northern Vietnam. Caridina thachlam sp. nov. can be distinguished from its congeners by a suite of morphological characters such as strongly reduced eyes without eyestalk, short and almost unarmed rostrum and slender pereiopods. Molecul...

Emerging infectious diseases are on the rise in many different taxa, including, among others, the amphibian batrachochytrids, the snake fungal disease and the Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) virus, responsible for Coronavirus disease 2019 (COVID-19) in mammals. Following the onset of the pandemic linked to COVID-19, eas...

T VẤN ĐỀ Vịnh Hạ Long, vịnh Bái Tử Long nằm ở vùng ven bờ Đông Bắc Việt Nam, thuộc tỉnh Quảng Ninh, giáp ranh với thành phố Hải Phòng nằm trong khu vực vịnh tương đối kín với độ sâu thấp, nơi sâu nhất chỉ khoảng 25 m và trung bình chỉ đạt 5 m. Một trong những nét đặc sắc nhất của vịnh Hạ Long, vịnh Bái Tử Long là sự hiện diện của số lượng lớn đảo đ...

During 2017-2018 arsenic concentrations in soft tissues of economically important bivalves from the Mekong and the Red R. Deltas were estimated. Freshwater, estuarine and mangroves species in 10 genera from 11 sites were analyzed. Arsenic levels in both freshwater and estuarine clams were below the permissible limits for hazardous substances in fis...

Background Anthropogenic factors potentially affect observed biogeographical patterns in population genetics, but the effects of ancient human activities on the original patterns created by natural processes are unknown. Sinotaia quadrata , a widely distributed freshwater snail species in East Asia, was used to investigate this issue. It is unclear...

Macrobenthos diversity from Tam Dao mountainous areas was investigated through six surveys in 2016 and 2017. We identified 47 species of macrobenthos belonging to 33 genera, 18 families, 10 orders and 5 classes. In particular, on crab species (Indochinamon tannanti) was assessed as vulnerabe as Vietnam Red Book (2007) and one mussel species (Sinano...

An investigation on molluscs and crustaceans was conducted at 13 sites of different water bodies of the limestone mountains of Ha Lang District, Cao Bang Province in May 2019. As a result, a total of 13 species of molluscs and crustaceans (of the class Malacostraca) belonging to 10 families, 13 genera, were recorded. Two shrimp species (Caridina sp...

Limestone karsts can form terrestrial habitat islands for calcium-dependent organisms. In Vietnam, many karst habitats are threatened, while their rich biodiversity is still far from being thoroughly explored. Given that conservation of karst biota strongly relies on correct species identification, the presence of undetected cryptic species can pos...

Endemic organisms of ancient lakes have been studied as models to understand processes of speciation and adaptive radiation. However, it remains unclear how ancient lakes play roles in genetic and phenotypic diversity of freshwater mollusks. In the present study, we focus on viviparid freshwater snails in the ancient lakes of East and Southeast Asi...

Phylogenetic incongruence has frequently been encountered among different molecular markers. Recent progress in molecular phylogenomics has provided detailed and important information for evolutionary biology and taxonomy. Here we focused on the freshwater viviparid snails (Cipangopaludina chinensis chinensis and C. c. laeta) of East Asia. We condu...

Table of Content: Geographic Range, Population, Habitat, Biology & Ecology Tables and Figures

Southeast Asian apple snails, Pila spp., have been declining since the introduction of globally invasive, confamilial South American Pomacea spp., yet Pila ecology remains poorly studied, with most occurrence records unconfirmed. Pila scutata, a previously widespread species, presumed native to the Malay peninsula and assessed as Least Concern in t...

Cham Islands (Cu Lao Cham) is a group of 8 small islands in the Quang Nam province, Central Vietnam. There is only one study that mentioned the diversity of marine molluscs in this area. However, the data on species composition have not been digitised and not stored or shared for other purposes. Our paper aims to share the checklist of marine mollu...

The list of Bivalvia and Gastropod recorded in Cham Island in May 2017

Some photos of the species collected from Cham Islands, Vietnam, in May 2017

Freshwater mussels are declining globally, and effective conservation requires prioritizing research and actions to identify and mitigate threats impacting mussel species. Conservation priorities vary widely, ranging from preventing imminent extinction to maintaining abundant populations. Here, we develop a portfolio of priority research topics for...

The field surveys on macrobenthos were conducted at 8 sites in Cham Chu Natural Reserve in October 2018 and April 2019. A total of 22 species belonging to 16 genera, 12 families, 6 orders, 3 classes and 2 phyla of Mollusca and Arthropoda. Out of 22 species, five have been identified to generic level, including Macrobrachium sp., Caridina sp., Indoc...

Background: Islands have traditionally been the centre of evolutionary biological research, but the dynamics of immigration and differentiation at continental islands have not been well studied. Therefore, we focused on the Japanese archipelago, the continental islands located at the eastern end of the Eurasian continent. While the Japanese archip...

Currently, many species are facing the risk of extinction, as it one of the most serious conservation issues. Many conservation programs have evolved to prevent species extinction; however, developing these strategies may prove to be difficult for the species itself, which includes different cryptic species. In this paper, we document the invasion...

Chúng tôi đã thực hiện 2 thí nghiệm nhằm xây dựng kỹ thuật sinh sản cá Chuối hoa (Channa maculate Lacepède, 1801)) trong điều kiện nhân tạo. Thí nghiệm 1: Lựa chọn thức ăn để nuôi vỗ thành thục cá bố mẹ với 3 nghiệm thức: 100% cá tạp (NT1); 50% cá tạp kết hợp 50% thức ăn viên công nghiệp (NT2) và 100% thức ăn viên công nghiệp (NT3). Thí nghiệm 2: X...

Historical biogeography of the Margaritiferidae inferred from three different statistical modeling approaches

Systematic review of the Gibbosulinae

List of fossil calibrations that were used in BEAST analyses

Gene map of the F-type mitochondrial genome of Gibbosula crass

Specimens examined for conchological and anatomical features

Best-fit models of nucleotide substitution for each partition

List of characteristic examples of fossil records supporting the primary phylogenetic clades

Margaritiferidae generic names, authorities, and type species

Diversification rate statistics for the Margaritiferidae and Unionidae clades

Two Unionida (freshwater mussel) families are present in the Northern Hemisphere; the Margaritiferidae, representing the most threatened of unionid families, and the Unionidae, which include several genera of unresolved taxonomic placement. The recent reassignment of the poorly studied Lamprotula rochechouartii from the Unionidae to the Margaritife...

Vietnam has the second highest diversity of freshwater mussels (Unionida) in Asia after China. The purpose of this paper is to compile an up-to-date list of the modern unionid fauna of Vietnam and its current conservation status. Unfortunately, there has been relatively little research on this fauna in Vietnam. Fifty-nine species of Unionida have b...

The insular limestone karsts of northern Vietnam harbor a very rich biodiversity. Many taxa are strongly associated with these environments, and individual species communities can differ considerably among karst areas. The exact processes that have shaped the biotic composition of these habitats, however, remain largely unknown. In this study, the...

Recent research efforts have significantly advanced our knowledge on Asian freshwater mussel (Bivalvia: Unionida) diversity and distribution. Here we provide a modern consensus of the diversity, biogeography and conservation of Unionida in the region comprising East and Southeast Asia (excluding Wallacea) and Asian Russia. A data review confirmed t...

Abstract. During recent survey work and examination of museum collections in Hanoi, we became aware that a species misidentified in the literature was in fact a new and rare species of freshwater bivalve. It is currently known only from 12 dry valves in the collections in Hanoi, Vietnam and 2 valves in the North Carolina Museum Collection. These sp...

Tiwaripotamon Bott, 1970 is a genus of terrestrial crabs living around southwestern China and northern Vietnam. This genus showed a high diversity and endemism. Nine species have been found and eight of them are only known from Vietnam. It seems to be that each province with limestone mountains in northern Vietnam has their own Tiwaripotamon specie...

Marine organisms with a planktonic larval stage can passively disperse long distance and are thus expected to have a wider distribution range and lower geographic variation. However, recent molecular phylogenetic studies have revealed that they often display a clear geographic genetic structure or even form a geographically fragmented species compl...

Two new terrestrial crab species of the family Potamidae, Tiwaripotamon xuanson and T. hamyen, are described from northern Vietnam. Tiwaripotamon xuanson was collected from Xuan Son National Park, Thanh Son district, Phu Tho province, and T. hamyen was found in Binh Xa commune, Ham Yen district, Tuyen Quang province. They can be distinguished from...