Satoshi Shimano | Hosei University (original) (raw)
Papers by Satoshi Shimano
Eisei Dobutsu, Jun 25, 2023
Herpetology Notes, Oct 30, 2019
Among various environments occurring in tropical rainforests, the tree canopy, which is the upper... more Among various environments occurring in tropical rainforests, the tree canopy, which is the uppermost layer of forest, sustains the large portion of biodiversity (Basset, 2001; Kays and Allison, 2001; Floren et al., 2014). Methodological developments for accessing tree crowns and collecting plants and animals on the treacherous footing have partly solved the difficulties in surveying forest canopies (Lowman, 2009). However, recent studies on reptiles in these habitats have been relatively limited when compared with arthropods, birds, mammals, and even anurans (Kays and Allison, 2001; Nadkarni et al., 2011), although a significant portion of squamates are arboreal species (Kays and Allison, 2001; Das, 2012). Recently, various methods for surveying herpetofauna in arboreal habitat were proposed and reviewed (Das, 2012), and some exciting works have attempted to evaluate the communities by qualitative and quantitative ways (e.g., McCracken and Fostner, 2008, 2014; Scheffers et al., 2014a, b; Donald et al., 2017). Nonetheless, the accumulation of individual observations provides additional information, revealing how arboreal reptiles and amphibians are living in the upper layers of the tropical rainforest. Here we report an observation of egg oviposition sites for a rainforest canopy gecko. The second to ninth authors conducted surveys on epiphytic ferns in the Lambir Hills National Park, Sarawak, Malaysian Borneo (4.1983°N, 114.0428°E, 100-200 m above sea level; Inoue et al., 1995) in August and September 2016. Annual mean temperature in this area is ca. 27°C with little seasonal fluctuation (Kumagai et al., 2009). Monthly precipitation is rarely less than 100 mm all year round, and relatively high from October to December and low in February and March (Kato et al., 1995). The national park is mostly covered with multi-layered, primary lowland mixed-dipterocarp forest (Ashton and Hall, 1992), whose canopy reaches 35-40 m in height, with emergent trees attaining over 70 m (Kato et al., 1995). On 4 September, AN and NK (the second and third authors, respectively) collected an epiphytic bird's nest fern, Aspelnium sp., from the trunk of a host tree (Fig. 1-A) by tree climbing using the single-and doubledrope techniques, and found a pair of unidentified eggs attached to the fern. The fern was rooted on the base of a main branch at 32.3 m above ground. The host tree was Shorea confusa (Dipterocarpaceae), whose diameter at
日本微生物生態学会講演要旨集, Sep 15, 2007
Systematic & Applied Acarology, Mar 6, 2023
A new feather mite Pelargolichus orientalis sp. nov. is described from the Oriental White Stork, ... more A new feather mite Pelargolichus orientalis sp. nov. is described from the Oriental White Stork, Ciconia boyciana Swinhoe, 1873, one of the world’s most endangered bird species. This mite species was collected from feathers of the Oriental White Storks bred in the Tama Zoological Park in Japan. The native population of the Oriental White Stork and feather mites associated with this bird had been extinct in Japan since 1986. Wild individuals of this bird species were transported from the Eurasian Continent to Japanese breeding facilities, and in the 2000s, a small wild population was restored. The new mite species is presently distributed in natural fields in Japan along with its introduced host population. This study presents the first record of the feather mite genus Pelargolichus in Japan.
Scientific Reports, Mar 4, 2020
The original version of this Article did not meet the requirement of the amendment of Article 8.5... more The original version of this Article did not meet the requirement of the amendment of Article 8.5.3 of the International Code of Zoological Nomenclature 1. To fully meet the amended provisions of the Code, the following Nomenclatural Acts have been added to the Materials and Methods section:
Genes & Genetic Systems, 2011
Mitochondrial DNA Part B, Jul 2, 2020
We determined the complete mitochondrial genome sequences of two water mites, Hygrobates (Hygroba... more We determined the complete mitochondrial genome sequences of two water mites, Hygrobates (Hygrobates) longiporus and H. (Rivobates) taniguchii. The length of the entire mitogenome of these two species is 13,721 bp and 13,770 bp long, respectively. Both of them contain 13 proteins, two rRNAs, and 22 tRNAs for a total of 37 gene products. The gene order of Hygrobates is almost identical to the two species of Unionicola we included in the analysis, with some difference in the position of transfer RNA genes. Phylogenetic analyses highly support these Hygrobates species form a clade with other species of the Hygrobatoidea.
Mycoscience, 2011
Ophiocordyceps pulvinata, a pathogen of ants, is formally described as a new species. Genus level... more Ophiocordyceps pulvinata, a pathogen of ants, is formally described as a new species. Genus level designation of this species is difficult due to several apparently conflicting morphological and ecological characters. Affinity with Ophiocordyceps is suggested by the dark color stroma and ascospore morphology. However, the species was included in a book of entomopathogenic fungi of Japan as Torrubiella sp. due to the production of perithecia on an astipitate stroma. Phylogenetic analyses of molecular data support a close relationship with O. unilateralis, a finding consistent with morphological characteristics of the color, asci and ascospores and ecological traits of host affiliation. Thus, O. pulvinata represents another example of the loss of stipe for the hypocrealean arthropod pathogenic fungi and highlights the utility of asci and ascospore morphology as taxonomically informative characters of closely related taxa.
Zoosymposia, Nov 30, 2022
Currently, in the Red List of the Ministry of the Environment, Japan (Hereinafter referred to as ... more Currently, in the Red List of the Ministry of the Environment, Japan (Hereinafter referred to as RL-MOE) (version 2020), the only terrestrial arthropod other than insects that are classified as Extinct (EX) is the feather mite, Compressalges nipponiae Dubinin (Caudiferidae) (Waki & Shimano, 2022). The feather mite C. nipponiae is a monoxenous ectoparasite of the Crested Ibis Nipponia nippon (Temminck) (original Japanese pronunciation is “Nippon”). The mite species was originally sampled from the Crested Ibis collected at Lake Khanka (Russia) in the 1950s and was described as new species in the papers by Dubinin (1950). The species is not found on birds other than the Crested Ibis, suggesting that it is highly host specific.
Zoosymposia, Nov 30, 2022
European Journal of Protistology, Aug 1, 2009
We investigated a Histiobalantium natans viridis population from the ancient Lake Biwa in Japan, ... more We investigated a Histiobalantium natans viridis population from the ancient Lake Biwa in Japan, using live observation, silver impregnation, and the small subunit rRNA gene sequence. The morphological and molecular data show, with high support, a close relationship of Histiobalantium, Schizocalyptra and Pleuronema, supporting the family Pleuronematidae Kent, whose nearest relatives are the Cyclidiidae Ehrenberg. A family Histiobalantiidae Puytorac and Corliss is not supported, either by the nucleotide sequences or the morphologic data, except for the curious dorsal location of the cytopyge. Likewise, the data do not support inclusion of Histiobalantium in the family Sulcigeridae Gajewskaja, as very recently suggested by Jankowski, whose classification is based on a misidentified Sulcigera comosa. Further, there are good reasons to synonymize the genus Gajewskiella Obolkina with Histiobalantium. The European and Asian populations of H. natans differ significantly in the structure of adoral membranelle 1, suggesting that they are different species. However, there is some indication that the differences are caused by deficient data on the European H. natans, which is thus in need of detailed redescription. This applies also to the North American Histiobalantium agile Stokes which is probably not conspecific with the Eurasian H. natans. The status of the forma H. natans viridis and H. natans nigricans is not known because detailed data from nigricans are lacking. We prefer subspecific rank at the present state of knowledge.
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, 2023
Experimental and Applied Acarology, Nov 21, 2020
Riccardoella tokyoensis is a snail parasite recently recorded in Japan. To understand the basic e... more Riccardoella tokyoensis is a snail parasite recently recorded in Japan. To understand the basic ecology of this mite, we surveyed the life history of a population, including seasonal dynamics, host range, and geographical distribution in East Japan. Seasonal dynamics of the mite were studied in Rinshi-no-mori Park, Tokyo, Japan, from June 2016 to May 2018; thereafter, the morphology of each stage was described. In this park, the host population was infected with the mite in all seasons; however, the prevalence and infection intensities were highest during the warm seasons. Larvae and nymphs were found in the warm seasons. Proto-and tritonymphs were uncommon. To study the host range and geographical distribution, we sampled 1135 terrestrial mollusks from 16 families at 21 locations in Kanto and east Tokai areas from June 2016 to May 2020. Mites were detected at 13 locations, and only clausiliid snails were infected with the mite. Through a laboratory experiment, our observations confirmed that the mite was transmitted to the host lung via the pneumostome. None of the artificially infected snails died, although we maintained the snails for 2 months. No inflammation was found in naturally infected host tissue, suggesting that their virulence against the host snails was low. Riccardoella tokyoensis was not found in the litter layer in the field surveys, and no mite was observed on the external surface of the hosts, suggesting that the major habitat of this mite was the host lung.
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, May 25, 2019
Riccardoella (Proriccardoella) reaumuri Fain and van Goethem, 1986 (Ereynetidae Oudemans, 1931) i... more Riccardoella (Proriccardoella) reaumuri Fain and van Goethem, 1986 (Ereynetidae Oudemans, 1931) is one of the parasitic mites reported from lungs of land mollusks. This paper provides a morphological redescription of this species, with some information of leg setation and chaetotaxy, lyrifissures and aggenital region. Riccardoella reaumuri is distinct from and can be distinguished from the other seven species of genus Riccardoella Berlese, 1923 by the following features: all setae on idiosoma, palptarsi and legs not prolonged with apical filament; palptarsus with three setae; tibia I with five setae; femur I with one seta; trochanters I and III each with one seta; coxae I and III each with two setae; famulus forked distally and ca. 60% long of its guard seta; two pairs of pseudanal setae.
Nihon Dani Gakkaishi, Nov 25, 2022
Systematic & Applied Acarology, Jan 19, 2023
Scientific Reports, Dec 13, 2019
The Japanese islands represent one of the world's biodiversity hotspots. Their geological history... more The Japanese islands represent one of the world's biodiversity hotspots. Their geological history and present geography resulted in a high number of endemic species in nearly all major metazoan clades. We investigated the phylogeography of three different intertidal mite species from the Ryukyu islands and southern mainland by means of morphometry and molecular genetics. none of the species represents an endemic, nearly all show distributions ranging over at least the southern and central Ryukyus. Two species, Fortuynia shibai and F. churaumi sp. n. clearly represent sister species that are derived from a common Eastern ancestor. Molecular genetic results indicate that these species separated approx. 3 Ma before the opening of the Okinawa trough, whereas F. shibai most likely showed an ancestral distribution stretching from the central Ryukyus across the Tokara strait to Japanese mainland, whereas F. churaumi probably evolved somewhere south of the Tokara strait. Phylogenetic data further indicates that long periods of isolation resulted in heterogeneous genetic structure but subsequent low sea level stands during Pleistocene allowed recent expansion and gene flow between island populations. comparing these patterns with those of other animals, these tiny wingless mites apparently show better dispersal abilities than partially volant terrestrial organism groups.
Eisei Dobutsu, Jun 25, 2023
Herpetology Notes, Oct 30, 2019
Among various environments occurring in tropical rainforests, the tree canopy, which is the upper... more Among various environments occurring in tropical rainforests, the tree canopy, which is the uppermost layer of forest, sustains the large portion of biodiversity (Basset, 2001; Kays and Allison, 2001; Floren et al., 2014). Methodological developments for accessing tree crowns and collecting plants and animals on the treacherous footing have partly solved the difficulties in surveying forest canopies (Lowman, 2009). However, recent studies on reptiles in these habitats have been relatively limited when compared with arthropods, birds, mammals, and even anurans (Kays and Allison, 2001; Nadkarni et al., 2011), although a significant portion of squamates are arboreal species (Kays and Allison, 2001; Das, 2012). Recently, various methods for surveying herpetofauna in arboreal habitat were proposed and reviewed (Das, 2012), and some exciting works have attempted to evaluate the communities by qualitative and quantitative ways (e.g., McCracken and Fostner, 2008, 2014; Scheffers et al., 2014a, b; Donald et al., 2017). Nonetheless, the accumulation of individual observations provides additional information, revealing how arboreal reptiles and amphibians are living in the upper layers of the tropical rainforest. Here we report an observation of egg oviposition sites for a rainforest canopy gecko. The second to ninth authors conducted surveys on epiphytic ferns in the Lambir Hills National Park, Sarawak, Malaysian Borneo (4.1983°N, 114.0428°E, 100-200 m above sea level; Inoue et al., 1995) in August and September 2016. Annual mean temperature in this area is ca. 27°C with little seasonal fluctuation (Kumagai et al., 2009). Monthly precipitation is rarely less than 100 mm all year round, and relatively high from October to December and low in February and March (Kato et al., 1995). The national park is mostly covered with multi-layered, primary lowland mixed-dipterocarp forest (Ashton and Hall, 1992), whose canopy reaches 35-40 m in height, with emergent trees attaining over 70 m (Kato et al., 1995). On 4 September, AN and NK (the second and third authors, respectively) collected an epiphytic bird's nest fern, Aspelnium sp., from the trunk of a host tree (Fig. 1-A) by tree climbing using the single-and doubledrope techniques, and found a pair of unidentified eggs attached to the fern. The fern was rooted on the base of a main branch at 32.3 m above ground. The host tree was Shorea confusa (Dipterocarpaceae), whose diameter at
日本微生物生態学会講演要旨集, Sep 15, 2007
Systematic & Applied Acarology, Mar 6, 2023
A new feather mite Pelargolichus orientalis sp. nov. is described from the Oriental White Stork, ... more A new feather mite Pelargolichus orientalis sp. nov. is described from the Oriental White Stork, Ciconia boyciana Swinhoe, 1873, one of the world’s most endangered bird species. This mite species was collected from feathers of the Oriental White Storks bred in the Tama Zoological Park in Japan. The native population of the Oriental White Stork and feather mites associated with this bird had been extinct in Japan since 1986. Wild individuals of this bird species were transported from the Eurasian Continent to Japanese breeding facilities, and in the 2000s, a small wild population was restored. The new mite species is presently distributed in natural fields in Japan along with its introduced host population. This study presents the first record of the feather mite genus Pelargolichus in Japan.
Scientific Reports, Mar 4, 2020
The original version of this Article did not meet the requirement of the amendment of Article 8.5... more The original version of this Article did not meet the requirement of the amendment of Article 8.5.3 of the International Code of Zoological Nomenclature 1. To fully meet the amended provisions of the Code, the following Nomenclatural Acts have been added to the Materials and Methods section:
Genes & Genetic Systems, 2011
Mitochondrial DNA Part B, Jul 2, 2020
We determined the complete mitochondrial genome sequences of two water mites, Hygrobates (Hygroba... more We determined the complete mitochondrial genome sequences of two water mites, Hygrobates (Hygrobates) longiporus and H. (Rivobates) taniguchii. The length of the entire mitogenome of these two species is 13,721 bp and 13,770 bp long, respectively. Both of them contain 13 proteins, two rRNAs, and 22 tRNAs for a total of 37 gene products. The gene order of Hygrobates is almost identical to the two species of Unionicola we included in the analysis, with some difference in the position of transfer RNA genes. Phylogenetic analyses highly support these Hygrobates species form a clade with other species of the Hygrobatoidea.
Mycoscience, 2011
Ophiocordyceps pulvinata, a pathogen of ants, is formally described as a new species. Genus level... more Ophiocordyceps pulvinata, a pathogen of ants, is formally described as a new species. Genus level designation of this species is difficult due to several apparently conflicting morphological and ecological characters. Affinity with Ophiocordyceps is suggested by the dark color stroma and ascospore morphology. However, the species was included in a book of entomopathogenic fungi of Japan as Torrubiella sp. due to the production of perithecia on an astipitate stroma. Phylogenetic analyses of molecular data support a close relationship with O. unilateralis, a finding consistent with morphological characteristics of the color, asci and ascospores and ecological traits of host affiliation. Thus, O. pulvinata represents another example of the loss of stipe for the hypocrealean arthropod pathogenic fungi and highlights the utility of asci and ascospore morphology as taxonomically informative characters of closely related taxa.
Zoosymposia, Nov 30, 2022
Currently, in the Red List of the Ministry of the Environment, Japan (Hereinafter referred to as ... more Currently, in the Red List of the Ministry of the Environment, Japan (Hereinafter referred to as RL-MOE) (version 2020), the only terrestrial arthropod other than insects that are classified as Extinct (EX) is the feather mite, Compressalges nipponiae Dubinin (Caudiferidae) (Waki & Shimano, 2022). The feather mite C. nipponiae is a monoxenous ectoparasite of the Crested Ibis Nipponia nippon (Temminck) (original Japanese pronunciation is “Nippon”). The mite species was originally sampled from the Crested Ibis collected at Lake Khanka (Russia) in the 1950s and was described as new species in the papers by Dubinin (1950). The species is not found on birds other than the Crested Ibis, suggesting that it is highly host specific.
Zoosymposia, Nov 30, 2022
European Journal of Protistology, Aug 1, 2009
We investigated a Histiobalantium natans viridis population from the ancient Lake Biwa in Japan, ... more We investigated a Histiobalantium natans viridis population from the ancient Lake Biwa in Japan, using live observation, silver impregnation, and the small subunit rRNA gene sequence. The morphological and molecular data show, with high support, a close relationship of Histiobalantium, Schizocalyptra and Pleuronema, supporting the family Pleuronematidae Kent, whose nearest relatives are the Cyclidiidae Ehrenberg. A family Histiobalantiidae Puytorac and Corliss is not supported, either by the nucleotide sequences or the morphologic data, except for the curious dorsal location of the cytopyge. Likewise, the data do not support inclusion of Histiobalantium in the family Sulcigeridae Gajewskaja, as very recently suggested by Jankowski, whose classification is based on a misidentified Sulcigera comosa. Further, there are good reasons to synonymize the genus Gajewskiella Obolkina with Histiobalantium. The European and Asian populations of H. natans differ significantly in the structure of adoral membranelle 1, suggesting that they are different species. However, there is some indication that the differences are caused by deficient data on the European H. natans, which is thus in need of detailed redescription. This applies also to the North American Histiobalantium agile Stokes which is probably not conspecific with the Eurasian H. natans. The status of the forma H. natans viridis and H. natans nigricans is not known because detailed data from nigricans are lacking. We prefer subspecific rank at the present state of knowledge.
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, 2023
Experimental and Applied Acarology, Nov 21, 2020
Riccardoella tokyoensis is a snail parasite recently recorded in Japan. To understand the basic e... more Riccardoella tokyoensis is a snail parasite recently recorded in Japan. To understand the basic ecology of this mite, we surveyed the life history of a population, including seasonal dynamics, host range, and geographical distribution in East Japan. Seasonal dynamics of the mite were studied in Rinshi-no-mori Park, Tokyo, Japan, from June 2016 to May 2018; thereafter, the morphology of each stage was described. In this park, the host population was infected with the mite in all seasons; however, the prevalence and infection intensities were highest during the warm seasons. Larvae and nymphs were found in the warm seasons. Proto-and tritonymphs were uncommon. To study the host range and geographical distribution, we sampled 1135 terrestrial mollusks from 16 families at 21 locations in Kanto and east Tokai areas from June 2016 to May 2020. Mites were detected at 13 locations, and only clausiliid snails were infected with the mite. Through a laboratory experiment, our observations confirmed that the mite was transmitted to the host lung via the pneumostome. None of the artificially infected snails died, although we maintained the snails for 2 months. No inflammation was found in naturally infected host tissue, suggesting that their virulence against the host snails was low. Riccardoella tokyoensis was not found in the litter layer in the field surveys, and no mite was observed on the external surface of the hosts, suggesting that the major habitat of this mite was the host lung.
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, May 25, 2019
Riccardoella (Proriccardoella) reaumuri Fain and van Goethem, 1986 (Ereynetidae Oudemans, 1931) i... more Riccardoella (Proriccardoella) reaumuri Fain and van Goethem, 1986 (Ereynetidae Oudemans, 1931) is one of the parasitic mites reported from lungs of land mollusks. This paper provides a morphological redescription of this species, with some information of leg setation and chaetotaxy, lyrifissures and aggenital region. Riccardoella reaumuri is distinct from and can be distinguished from the other seven species of genus Riccardoella Berlese, 1923 by the following features: all setae on idiosoma, palptarsi and legs not prolonged with apical filament; palptarsus with three setae; tibia I with five setae; femur I with one seta; trochanters I and III each with one seta; coxae I and III each with two setae; famulus forked distally and ca. 60% long of its guard seta; two pairs of pseudanal setae.
Nihon Dani Gakkaishi, Nov 25, 2022
Systematic & Applied Acarology, Jan 19, 2023
Scientific Reports, Dec 13, 2019
The Japanese islands represent one of the world's biodiversity hotspots. Their geological history... more The Japanese islands represent one of the world's biodiversity hotspots. Their geological history and present geography resulted in a high number of endemic species in nearly all major metazoan clades. We investigated the phylogeography of three different intertidal mite species from the Ryukyu islands and southern mainland by means of morphometry and molecular genetics. none of the species represents an endemic, nearly all show distributions ranging over at least the southern and central Ryukyus. Two species, Fortuynia shibai and F. churaumi sp. n. clearly represent sister species that are derived from a common Eastern ancestor. Molecular genetic results indicate that these species separated approx. 3 Ma before the opening of the Okinawa trough, whereas F. shibai most likely showed an ancestral distribution stretching from the central Ryukyus across the Tokara strait to Japanese mainland, whereas F. churaumi probably evolved somewhere south of the Tokara strait. Phylogenetic data further indicates that long periods of isolation resulted in heterogeneous genetic structure but subsequent low sea level stands during Pleistocene allowed recent expansion and gene flow between island populations. comparing these patterns with those of other animals, these tiny wingless mites apparently show better dispersal abilities than partially volant terrestrial organism groups.