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Two species of decapod crustaceans collected from deep sea off eastern Hokkaido, Japan, are reported. Sclerocrangon rex n. sp. (Caridea: Crangonidae) is described and illustrated on the basis of material collected off Kushiro and in the Nemuro Strait at depths of 500-1000 m. It is morphologically similar to S. derjugini Kobjakova, 1936 and S. igarashii Komai & Amaoka, 1991, both occurring in waters off eastern Hokkaido, but is easily distinguished from the latter two by the possession of an extra spine on the postorbital carina on the carapace, located posterior to the level of hepatic spines. The second, Munidopsis verrilli Benedict, 1902 (Anomura: Munidopsidae), is the first representative of this squat lobster family to be recorded from northern Japan. The single specimen of M. verrilli was collected in the Nemuro Strait off Shiretoko Peninsula at depths of 700-1000 m. Copyright © 2016 Magnolia Press.


Hibino M.,Fukushima Prefecture Government | Matsuzaki K.,Fukushima Prefecture Government | Komai T.,Natural History Museum and Institute
Zootaxa | Year: 2015

Pandalopsis spinosior Hanamura, Kohno & Sakaji, 2000 (Decapoda: Caridea: Pandalidae) was originally described on the basis of material collected in the Urup Strait, South Kurile Islands, but there have been no subsequent records of the species since the original description. The Marine Science Museum, Fukushima Prefecture (Aquamarine Fukushima) has carried out investigations on deep-water animals in the Nemuro Strait, off Shiretoko Peninsula, Hokkaido, Japan, amongst the collections a large, commercially important pandalid shrimp routinely identified with P. coccinata Urita, 1941. Examination of the specimens from the collections, however, resulted in an unexpected identification with P. spinosior, instead of P. coccinata. In this short article, diagnostic characters of P. spinosior are reassessed, and comparison with P. coccinata is made. The validity of P. zarenkovi Ivanov & Sokolov, 2001, for which possible synonymy with P. spinosior was suggested, is maintained for the time being. © 2015 Magnolia Press.


Komai T.,Natural History Museum and Institute | Matsuzaki K.,Fukushima Prefecture Government | Hibino M.,Fukushima Prefecture Government
Zootaxa | Year: 2016

A poorly known thorid shrimp, Lebbeus longidactylus (Kobjakova, 1936), is redescribed on the basis of material collected from the Nemuro Strait, southwestern part of the Sea of Okhotsk, at depths of 600-800 m. The newly collected samples represent the second finding of this rarely collected species since the type description. The species belongs to the informal species group characterized by the possession of epipods on maxilliped 3 to pereopod 2, and appears close to L. scrippsi Wicksten & Méndez, 1982, known from the eastern Pacific, in that the slender dactyli of pereopods 3-5 each terminate in a simple, non-biunguiculate tip and by having accessory spiniform setae restricted to the proximal half of the flexor mar-gin. The elongate rostrum with more numerous dorsal spines, more numerous dorsolateral spiniform setae on the telson, and a single spine on the dorsodistal margin of article 1 of the antennular peduncle readily differentiate L. longidactylus from L. scrippsi. Copyright © 2016 Magnolia Press.


PubMed | Fukushima Prefecture Government and Natural History Museum and Institute
Type: Journal Article | Journal: Zootaxa | Year: 2016

A poorly known thorid shrimp, Lebbeus longidactylus (Kobjakova, 1936), is redescribed on the basis of material collected from the Nemuro Strait, southwestern part of the Sea of Okhotsk, at depths of 600-800 m. The newly collected samples represent the second finding of this rarely collected species since the type description. The species belongs to the informal species group characterized by the possession of epipods on maxilliped 3 to pereopod 2, and appears close to L. scrippsi Wicksten & Mndez, 1982, known from the eastern Pacific, in that the slender dactyli of pereopods 3-5 each terminate in a simple, non-biunguiculate tip and by having accessory spiniform setae restricted to the proximal half of the flexor margin. The elongate rostrum with more numerous dorsal spines, more numerous dorsolateral spiniform setae on the telson, and a single spine on the dorsodistal margin of article 1 of the antennular peduncle readily differentiate L. longidactylus from L. scrippsi.


PubMed | Fukushima Prefecture Government and Natural History Museum and Institute
Type: Journal Article | Journal: Zootaxa | Year: 2016

Two species of decapod crustaceans collected from deep sea off eastern Hokkaido, Japan, are reported. Sclerocrangon rex n. sp. (Caridea: Crangonidae) is described and illustrated on the basis of material collected off Kushiro and in the Nemuro Strait at depths of 500-1000 m. It is morphologically similar to S. derjugini Kobjakova, 1936 and S. igarashii Komai & Amaoka, 1991, both occurring in waters off eastern Hokkaido, but is easily distinguished from the latter two by the possession of an extra spine on the postorbital carina on the carapace, located posterior to the level of hepatic spines. The second, Munidopsis verrilli Benedict, 1902 (Anomura: Munidopsidae), is the first representative of this squat lobster family to be recorded from northern Japan. The single specimen of M. verrilli was collected in the Nemuro Strait off Shiretoko Peninsula at depths of 700-1000 m.


PubMed | Fukushima Prefecture Government and Natural History Museum and Institute
Type: Journal Article | Journal: Zootaxa | Year: 2015

Pandalopsis spinosior Hanamura, Kohno & Sakaji, 2000 (Decapoda: Caridea: Pandalidae) was originally described on the basis of material collected in the Urup Strait, South Kurile Islands, but there have been no subsequent records of the species since the original description. The Marine Science Museum, Fukushima Prefecture (Aquamarine Fukushima) has carried out investigations on deep-water animals in the Nemuro Strait, off Shiretoko Peninsula, Hokkaido, Japan, amongst the collections a large, commercially important pandalid shrimp routinely identified with P. coccinata Urita, 1941. Examination of the specimens from the collections, however, resulted in an unexpected identification with P. spinosior, instead of P. coccinata. In this short article, diagnostic characters of P. spinosior are reassessed, and comparison with P. coccinata is made. The validity of P. zarenkovi Ivanov & Sokolov, 2001, for which possible synonymy with P. spinosior was suggested, is maintained for the time being.


PubMed | Fukushima Prefecture Government and Natural History Museum and Institute
Type: Journal Article | Journal: Zootaxa | Year: 2015

A new species of the caridean shrimp genus Lebbeus White, 1847 (Thoridae), L. fujimotoi n. sp. is described and illustrated on the basis of material from the Nemuro Strait, southwestern part of the Sea of Okhotsk, Hokkaido, Japan, at depths of 500-800 m. The new species belongs in the informal species group characterized by the possession of an epipod only on the third maxilliped, containing only L. elegans Komai, Kohtsuka & Hayashi, 2004 among the 65 previously described specific taxa. The elongate and strongly upturned rostrum with more numerous ventral teeth (seven or eight versus one to four) and the presence of a posteroventral tooth on the fourth pleonal pleuron immediately distinguish the new species from L. elegans. Species of Lebbeus reported from the Sea of Okhotsk are briefly overviewed.


Ohno T.,Gakushuin University | Muramatsu Y.,Gakushuin University | Miura Y.,Fukushima Prefecture Government | Oda K.,Gakushuin University | And 5 more authors.
Geochemical Journal | Year: 2012

In order to understand the behavior of radionuclides released from the Fukushima Daiichi nuclear power plant, the depth distributions of radiocesium and radioiodine were investigated in a wheat field, a rice paddy, an orchard, and a cedar forest in Koriyama, Fukushima Prefecture. Our results demonstrate that, following the nuclear power plant disaster, more than 90% of the radionuclides were distributed in the upper 6 cm of the soil column in the wheat field and within 4 cm of the surface in the rice paddy, orchard, and cedar forest. According to the measurement of radionuclides in the three adjacent agricultural fields, the variation of deposition densities in the wheat field was smaller than that of the orchard and rice paddy, suggesting that the low permeability of the orchard and paddy soils may cause horizontal migration of radionuclides during the initial deposition. This result indicates that the deposition densities in the wheat field should be appropriate for estimating the amount of fallout in the area. The deposition densities of 134Cs, 137Cs, and 131I in this area were estimated to be 512 ± 76 (SD, η = 5), 522 ± 80 (SD, η = 5), and 608 ± 79 (SD, η = 5) kBq/m2 (decay corrected to April 1, 2011), respectively. A comparison of the deposition density between the wheat field and the cedar forest suggests that more than half of the radionuclides are distributed in the tree canopies of the evergreen forestland. © 2012 by The Geochemical Society of Japan.


Urashima Y.,Japan National Agricultural Research Center | Sonoda T.,Fukushima Prefecture Government | Fujita Y.,Fukushima Prefecture Government | Uragami A.,National Institute of Vegetable and Tea Science
Microbes and Environments | Year: 2011

Growth inhibition due to continuous cropping of asparagus is a major problem; the yield of asparagus in replanted fields is low compared to that in new fields, and missing plants occur among young seedlings. Although soil-borne disease and allelochemicals are considered to be involved in this effect, this is still controversial. We aimed to develop a technique for the biological field diagnosis of growth inhibition due to continuous cropping. Therefore, in this study, fungal community structure and Fusarium community structure in continuously cropped fields of asparagus were analyzed by polymerase chain reaction/denaturing-gradient gel electrophoresis (PCR-DGGE). Soil samples were collected from the Aizu region of Fukushima Prefecture, Japan. Soil samples were taken from both continuously cropped fields of asparagus with growth inhibition and healthy neighboring fields of asparagus. The soil samples were collected from the fields of 5 sets in 2008 and 4 sets in 2009. We were able to distinguish between pathogenic and non-pathogenic Fusarium by using Alfie1 and Alfie2GC as the second PCR primers and PCR-DGGE. Fungal community structure was not greatly involved in the growth inhibition of asparagus due to continuous cropping. By contrast, the band ratios of Fusarium oxysporum f. sp. asparagi in growth-inhibited fields were higher than those in neighboring healthy fields. In addition, there was a positive correlation between the band ratios of Fusarium oxysporum f. sp. asparagi and the ratios of missing asparagus plants. We showed the potential of biological field diagnosis of growth inhibition due to continuous cropping of asparagus using PCR-DGGE.


The finite difference method has adequate accuracy to calculate fully-developed laminar flows in regular cross-sectional domains, but in irregular domains such flows are solved using the finite element method or structured grids. However, it has become apparent that we can use the finite difference method freely even if domains are complex. The non-slip condition on the wall must be imposed. Even in irregular domains, this boundary condition can be introduced indirectly by adding a single procedure to set the boundary condition. The calculations have similar accuracy as in regular domains. The proposed method has a wide range of applications; as a first step, fully-developed laminar flows are investigated in the paper. © 2011 Copyright 2011 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License.

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