Satoshi Chiba's research while affiliated with Tohoku University and other places
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Publications (181)
Congenital fitness-disadvantageous mutations are not maintained in the population; they are purged from the population through processes such as purifying selection. However, these mutations could persist in the population as polymorphisms when it is advantageous for the individuals carrying them in adapting to a specific external environment. We t...
Studies on the evolution of avian flight have failed to clarify why wing shape is weakly correlated with flight styles and phylogenetically constrained. Birds seem to have achieved their diverse flight styles owing to changes in the shapes of localized parts of the wing, despite a highly conserved wing outline. The alula, which stems from the first...
Accurate species identification is foundational to the management of introduced species. However, the current knowledge of the introduced hygrophilid snails in Japan, which is a hotspot of freshwater mollusks, is limited. We report the first record of Planorbella duryi (Wetherby, 1879) in Japan collected on two of the Bonin Islands, a World Heritag...
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...
Accumulating information on the distribution of symbionts and their host species is important for studying how the symbionts have diversified. Pseudocladophora conchopheria is a green alga that grows on the shells of specific intertidal gastropods distributed in the Japanese archipelago, Ryukyu islands and Southern part of the Korean Peninsula. We...
Long‐distance dispersal (LDD) is a critical process in the distribution of less‐migratory organisms. Migratory birds are considered the principal vector of LDD, especially over extremely long distances such as between continents. However, there has been no evidence of LDD spanning thousands of kilometers, even via birds. In this study, we collected...
Host shifts represent the advancement of a novel niche and often lead to speciation in symbionts. However, its mechanisms are not well understood. Here, we focused on the alga Pseudocladophora conchopheria growing on the shells of intertidal snails. Previous surveys have shown that the alga has host specificity-only attaching to the shell of Lunell...
Aim
Oceanic islands provide an excellent opportunity to study the mode and tempo of phenotypic evolution of terrestrial organisms. Many studies have focused on oceanic islands far from the mainland. Oceanic islands near the mainland may provide distinct perspectives on phenotypic evolution, but a comprehensive understanding is still lacking. To add...
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...
Aegista Albers, 1850 is a large genus of the land snail family Camaenidae Pilsbry, 1895 and distributed in south, southeast and east Asian countries (from India and Nepal to Korea and Japan). Fourteen species and subspecies of Aegista are known from South Korea. They were described, based only on shell morphology during 1887–1943 and our knowledge...
Objective
Mandarina is an endangered land snail genus of the oceanic Ogasawara archipelago. On Chichijima Island, the largest inhabited island in Ogasawara, this genus is almost extinct in the wild due to predation by invasive species. Although ex situ conservation programs started in 2010, genetic diversity and population structure remain unclear...
Knowing how the present distribution of organisms was formed is an essential issue in evolutionary ecology. Recently, the distribution of organisms on Earth has been significantly changed by human-mediated dispersal due to globalization. Therefore, significant attention has been paid to such processes. However, although humankind has taken consider...
Dispersal is a fundamental mechanism for maintaining biodiversity, and long‐distance dispersal (LDD) has attracted the interest of many researchers owing to its unusual characteristics. Conventionally, LDD has been defined based on absolute and proportional distances; however, it has recently been redefined based on geographic and genetic limits. B...
We demonstrated the genetic variation and population structure of a direct developing marine gastropod, Littorina horikawai which is endemic species distributed in the western coast of Kyushu, Japan and is found mainly on the adjacent islands. We conducted the field survey and sampling covering most of the distribution area of L. horikawai. In tota...
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...
Objective: Mandarina is an endangered land snail genus of the oceanic Ogasawara archipelago. On Chichijima Island, the largest inhabited island in Ogasawara, this genus is almost extinct in the wild due to predation by invasive species. Although ex situ conservation programs started in 2010, genetic diversity and population structure remain unclear...
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...
Ullung Island is an oceanic island in the Sea of Japan about 130 km distant from the Korean peninsula. The biota of this oceanic island is thought to be derived from the closest continental region while the importance of long-distance dispersal from other areas for the formation of the Ullung Island biota was considered negligible. In this study, w...
Reliable identification of species is important for protecting native ecosystems against the invasion of non-native species. DNA barcoding using molecular markers, such as the mitochondrial cytochrome oxidase subunit 1 (COI) gene, helps researchers distinguish species. In this study, we focused on introduced veronicellid slugs in the Ryukyu Islands...
Molecular studies based on the high resolution genetic markers help us to grasp the factor shaping the genetic structure of marine organisms. Ecological factors linking to life history traits have often explained the process of genetic structuring in open and connectable oceanic environments. Besides, population genetic divergence can be affected b...
The transfer of male accessory gland secretions is a well-investigated reproductive strategy for winning in sexual selection. An example of such a strategy is the conspicuous mating behaviour of simultaneously hermaphroditic land snails, the so-called shooting of love-darts, whereby a snail drives love-dart(s) into the body of its mating partner. I...
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...
Background
To grasp the processes of spatial genetic structuring in open and connectable marine environments is the principal study goal in molecular biological studies. Comparative seascape genetics using multiple species are a powerful approach to understand the physical geographic and oceanographic effects on genetic variation. Besides, species-...
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...
The maritime gastropod Gastrocopta armigerella (Reinhardt, 1877) was found from Jeju Island, South Korea. This is the first record from the island.
Ecological release is often attributed to the rapid adaptive diversification of phenotypic traits. However, it is not well understood how natural selection changes its strength and direction through the process of ecological release. Herein, we demonstrated how shell colour of the Japanese land snail Euhadra peliomphala simodae has diversified via...
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...
The mechanisms of adaptive radiation with phenotypic diversification and further adaptive speciation have been becoming clearer through a number of studies. Natural selection is one of the primary factors that contribute to these mechanisms. It has been demonstrated that divergent natural selection acts on a certain trait in adaptive radiation. How...
Invasive species greatly disrupt island ecosystems, risk assessment and the conservation of native ecosystems have therefore become pressing concerns. However, the cost of monitoring invasive species by humans is often high. In this study, we developed a system to detect an invasive lizard species, Anolis carolinensis, that threatens the native ins...
Tegula xanthostigma (A. Adams, 1853) has two shell colour forms: a black form and a brown-green form that was once named as Chlorostoma lischkei Pilsbry, 1889. Recent molecular phylogenetic and ecological studies have demonstrated that these two forms are genetically distinct and furthermore differ in habitat usage patterns. It is thus reasonable t...
Environmental factors promote symbiosis, but its mechanism is not yet well understood. The alga Pseudocladophora conchopheria grows only on the shell of an intertidal gastropod Lunella correensis , and these species have a close symbiotic relationship which the alga reduces heat stress of the gastropod. In collaboration with general public, we inve...
Maritime ecosystems in Vietnam such as mangroves and mud flats are characterized by high biodiversity. However, elements of its biodiversity remain unclear and highly threatened. In this context, the assessment of rare species is a starting point to develop effective strategies for the conservation of entire ecosystems. In this paper, we report upo...
Although marine phylogeographers have accumulated knowledge of the evolutionary history of various invertebrates, there is a large bias among the taxa regarding genetic data. The order Polycladida is a typical example for which little genetic information at population level is available. Here, we focused on the polyclad flatworm Stylochoplana pusil...
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...
Biogeography and genetic variation of freshwater organisms are influenced not only by current freshwater connections but also by past drainage networks. The Seto Inland Sea is a shallow enclosed sea in Japan, but geological evidence showed that a large freshwater drainage had intermittently appeared in this area between the late Pliocene and Pleist...
Bradybaena similaris (Férussac, 1822) is an invasive land snail species native to East and Southeast Asia. Here we report the first record of B. similaris in Bangladesh, an introduced species in this country.
The planorbid species that were described by Shuichi (Syuiti) Mori from Japan have long been enigmatic and their taxonomy has been highly confused. This situation is also an impediment to action for the conservation of Japanese planorbids which are one of the most threatened freshwater snail groups in the country. Based on our examination of Shuich...
Granulilimax fuscicornisMinato, 1989 is an endemic land slug of Japan. This slug was described as a member of the stylommatophoran family Philomycidae Gray, 1847, and subsequently transferred into the systellommatophoran family Rathouisiidae Heude, 1885. It is still unclear whether the taxonomic revision to Rathouisiidae is supported by genetic dat...
The evolutionary history and diversity of unionoid mussels in East Asia need to be clarified and would shed light on the formation process of the unique fauna of Japan. Unionoid mussels (Mollusca: Bivalvia) are unique models for understanding the process by which organisms have diversified before and after the formation of the Japanese archipelago....
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Otesiopsis Habe, 1946 is a land snail genus, which is known so far from Japan and Taiwan. Individuals of this genus were collected from Gageodo Island, South Korea. This is the first record of the genus Otesiopsis from this country. The individuals from Gageodo Island appear to be a new species because of their unique shell morphologies, while the...
Other than hard bones and shells, it is rare for soft tissues to fossilize, but occasionally they are well preserved in amber. Here, we focus on both modern and fossilized species of the land snail superfamily Cyclophoroidea. Phylogenetic relationships within the Cyclophoroidea were previously studied using extant species, but timing of divergence...
Trematode parasites have complex life cycles and use a variety of host species across different trophic levels. Thus, they can be used as indicators of disturbance and recovery of coastal ecosystems. Estuaries on the Pacific coast of northeastern Japan were heavily affected by the 2011 Tohoku earthquake tsunami. To evaluate the effect of the tsunam...
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...
Freshwater mollusks often show high intraspecific variability in shell morphology, which may cause incongruences between molecular phylogeny and morphology-based species taxonomy. However, it remains unclear how morphological variations in freshwater snails are associated with different habitats such as rivers, ponds, and lakes. In the present stud...
We investigated nonmarine gastropod fauna on Ulleung Island, an oceanic island in South Korea. Surveys were conducted in June and September 2018, which newly recorded four terrestrial gastropod species (Paludinellassiminea cf. japonica (Pilsbry, 1901), Vallonia costata (Müller, 1774), Meghimatium cf. bilineatum (Benson, 1842) and Ambigolimax sp.) a...
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...
Aim
Vicariance events have been proposed as a major source of lineage divergence on continental islands, whereas dispersal events followed by isolation have been proposed as the major cause on oceanic islands. However, organisms on continental islands may include taxa with characteristics similar to those on oceanic islands. Lineage divergence unas...
Marine organisms often show high levels of morphological variation within and among species as a result of adaptation to the habitat heterogeneity in coastal environments. We investigated the relationship between the geographical patterns of two contrasting shell-surface morphotypes (smooth vs ribbed) and genetic diversity in East Asian members of...
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...
Figure S1. Shells of representatives of the genus Biwamelania used in this study.
Figure S2. Geographical distribution of nine Biwamelania species with limited distribution ranges.
Table S1. The sampling localities of Semisulcospira spp. and the summary of RAD loci analyzed in this study.
Over the past decade, many skeletal matrix proteins that are possibly related to calcification have been reported in various calcifying animals. Molluscs are among the most diverse calcifying animals and some gastropods have adapted to terrestrial ecological niches. Although many shell matrix proteins have already been reported in molluscs, most re...
Lake expansion that leads to the formation of new habitats has potential to drive intralacustrine diversification. The ancient Lake Biwa in central Japan has historically experienced substantial changes in the lake size, and it provides a useful system for evaluating the role of lake‐size fluctuations in the diversification of endemic fauna. Here,...
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...
The study of glacial relict species has been focused on understanding how the biogeographic patterns of species have developed. A number of studies using phylogenetic and population genetics approaches have been conducted for terrestrial glacial relict species, and the mechanisms of their formation have been elucidated. On the other hand, less focu...
Confirming the extinction of species with only old occurrence records is often difficult, due to the scarcity of biological information. Phylogenetic position and taxonomic status of the potentially extinct species are unclear in most such cases. In the present study, we document that a species of the endemic genus Hirasea of the oceanic Ogasawara...
Variation in the shell coiling, or chirality, of land snails provides an opportunity to investigate the potential for “single-gene” speciation, because mating between individuals of opposite chirality is believed not possible if the snails mate in a face-to-face position. However, the evidence in support of single-gene speciation is sparse, mostly...
Table S2. Estimates of FST between population samples, based on 4898 RAD‐seq‐derived SNPs. FST value between parapatric sinistrals and dextrals are shown in bold.
Table S1. Post quality‐filtering read counts for the 16 individuals that were included in the RAD‐Seq study.
Figure S1. Phylogenetic relationships between Euhadra mitochondrial 16S rRNA haplotypes, rooted on sinistral E. decorata (pale grey) and dextral E. senckenbergiana (dark grey).
Figure S2. Geographic distribution of sampled sinistral and dextral Euhadra populations and their corresponding 16S rRNA haplogroups across northern and central Honshu, Jap...
Table S4. The 13167 biallelic RAD‐seq loci that were found in eight or more individuals.
Table S3. Location and statistics for the samples used in the mitochondrial samples.
Table S5. Alignment of mtDNA haplotypes and associated Genbank accession numbers.
