Fuke Yusuke

• Ph.D.
• National Institute of Genetics

The range expansion of invasive species that threaten biodiversity is caused by repeated cycles of their artificial introduction and subsequent dispersal. While dispersal can occur without human intervention, its pattern is mainly determined by environmental factors and species characteristics. Knowledge regarding the dispersal processes of invasiv...

Semisulcospira Boettger, is a freshwater snail genus widely distributed in East Asia. The Japanese Semisulcospira consists of widespread riverine species and two species groups that have diversified in Lake Biwa (S. niponica and S. nakasekoae groups). Semisulcospira kurodai Kajiyama & Habe, is a member of the S. niponica group and has been known as...

Although the Pacific coast of Honshu Island, Japan, is a temperate zone, tropical aquatic species have been known to occur in this area because of the influence of the Kuroshio Current. The distributional records of the southern species provide interesting information for studying the expansion of their distributional ranges owing to climate change...

Shih et al. (2024) reported on the detection of Neocaridina species in Japan and their morphological characteristics in Zoological Studies. Eleven taxa were identified based on mitochondrial DNA (mtDNA) analysis and morphological examination. Among these, they identified two taxa that formed sister groups: N. denticulata and N. davidi, which are pr...

Stripes and bands are common colour patterns in snakes. Some species are known to exhibit colour polymorphism and that includes expressing it in the bands and stripes. Bridal snake, Dryocalamus is a medium-sized arboreal snake in South to Southeast Asia and most species of the genus are banded, but including two striped species. In Borneo, banded D...

A freshwater shrimp, Neocaridina denticulata (De Haan, 1844), distributed over a wide area of western Japan, has a landlocked life history and lives its entire life in freshwater. This species also occurs on adjacent islands, and some populations are genetically distinct from mainland populations. Since this species cannot disperse beyond the sea,...

The morphological characters of the freshwater shrimp called "Ryugu-hime-ebi" in Japan are not always consistent with those of Caridina laoagensis, which has been given its Japanese name. Recently, a cryptic species of C. weberi species group that includes C. laoagensis was newly described as Caridina tupaia. We aimed to resolve the historical conf...

Semisulcospira Boettger, 1886 is a freshwater snail genus divergent in Lake Biwa, Japan. Although recent taxonomic studies of the genus have arranged taxonomic accounts of many species in the lake, our knowledge of morphological traits has still been insufficient in S. reticulata Kajiyama & Habe, 1961, which belongs to the S. niponica-group in the...

The freshwater prawn Macrobrachium ustulatum (Nobili, 1899) is distributed throughout the western Pacific Ocean and was first identified in Japan in 2015 on Okinawa Island, Ryukyu Islands. Knowledge of its distribution and habitat is lacking due to difficulties in distinguishing it from a morphologically similar sister species, Macrobrachium austra...

Knobtooth Prawn, Macrobrachium mammillodactylus (Thallwitz, 1891), is an amphidromous freshwater prawn that occurs in the tropics of the western Pacific Ocean. Here, we report a new record of this species from Miyako Island, in the Ryukyu Archipelago, Japan. The obtained specimens were mature, suggesting that they had overwintered. This record upda...

Inle Lake is an ancient lake in Myanmar, which is an important area with unique and diverse fauna. Its ichthyofauna is believed to have formed non-radiatively, but the historical processes are poorly understood. To elucidate the mechanisms that shape species diversity in this moderately isolated biogeographical ‘island’, this study focused on a typ...

Semisulcospira is a freshwater snail genus highly divergent in the ancient Lake Biwa, Japan, with a history of ~4 million years. Although the shell morphology, karyotype and molecular phylogeny of the genus have been well studied, the systematic status of several non-monophyletic species remains uncertain. In this study, we have evaluated the taxon...

Inle Lake, an ancient lake located in the Shan Plateau of Myanmar, is a biogeographically attractive region with high fish endemism. Some endemic species inhabit the lake as well as the surrounding areas. The genetic and ecological relationships between populations in the lake and surrounding areas provide important insights into the process underl...

The freshwater snail genus Semisulcospira has adaptively radiated in the ancient Lake Biwa, Japan. Although significant geographical variations have been known in the shell morphology of Semisulcospira niponica , their systematics remain uncertain. We evaluated the systematic status of the geographical variations in S. niponica and its congenerics...

Invasive species prevention involves avoiding two aspects: introduction and secondary spread. The latter is essential in places that can become hubs for spreading invasive species. Lake Biwa, the largest lake in Japan, is an important area for biodiversity and fisheries. However, several invasive fish and crustaceans were established in the lake la...

Hopong, a small town in the Salween (Thanlwin) River Basin, Myanmar, is located 35 km northeast of Inle Lake, a famous ancient lake with numerous endemic fish species. We surveyed the fish fauna of a spring pond in Hopong in 2016, 2019 and 2020 and identified 25 species. Of these, seven, including Inlecypris auropurpureus and Sawbwa resplendens , h...

Invasive species prevention involves the prevention of two aspects: introduction and secondary spread. The latter is important in places that can become hubs for the spread of invasive species. Lake Biwa, the largest lake in Japan, is an important area for biodiversity and fisheries. However, several invasive species of fish and crustaceans became...

Neocaridina denticulata (Decapoda: Atyidae) is a freshwater shrimp with a land-locked life-history and is widely distributed in western Japan. The taxonomic confusion of this species, caused by the loss of type specimens, unknown type locality, and genetic and morphological geographical variation, has led to inconveniences in biodiversity conservat...

The Hawaiian river shrimp Macrobrachium grandimanus (Randall, 1840) is an amphidromous brackish water prawn that inhabits the Hawaiian Islands (type locality), Ryukyu Islands, Melanesia (Fiji, New Caledonia), and Polynesia (Tonga). Here, we report a new record of this species from Guam, Micronesia. Two genetically and morphologically differentiated...

This paper reports the finding of one of the Palaemonidae freshwater prawns, Macrobrachium ustulatum, on Okinawa-jima Island, Ryukyu Archipelago, Japan. This represents the first record of this species in this country and also the northernmost distributional record of the species. Macrobrachium ustulatum redescribed by Castelin et al. (2017) is a c...