Yukio Hanamura

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Seasonal variation and the infestation pattern of epibiosis in the beach mysid Archaeomysis articulata Hanamura, 1997, were studied based on intertidal samples over 1 year on a sandy beach in Ishikari Bay, northern Japan. The mysid-peritrich ciliate association was a year-round phenomenon in Ishikari Bay and the prevalence of infestation varied from 49 to(More)
We examined the effect of tributyltin (TBT) on embryonic development of the Manila clam, Ruditapes philippinarum. In a maternal exposure test, 100 clams were exposed to TBT at measured concentrations of <0.01 (control), 0.061, 0.310, or 0.350 microg/l at 20-22 degrees C for 3 weeks, and the embryo developmental success (the ratio of normal D-larvae to all(More)
Stable carbon (δ13C) and nitrogen (δ15N) isotope ratios were measured to investigate the migration of John’s snapper Lutjanus johnii and its dependence on the food resources provided within the large Matang Mangrove Forest Reserve (40,151 ha), Malaysia. John’s snapper, and its main prey food such as penaeids, Acetes shrimps and mysids, showed generally(More)
Mysid feeding ecology was studied in a tropical mangrove estuary and adjacent coastal mudflat, using stomach content and stable isotope analyses. We tested the hypothesis that estuarine mysids are able to exploit the various basal food resources, while their bentho-pelagic habit related to nocturnal feeding explicates their important role as trophic(More)
A new species of the peracaridan order Bochusacea, Thetispelecaris yurikago, is described from a submarine cave on Grand Cayman Island, the Caribbean Sea. The new species is the fourth species of the order and family, and the second of the genus. Recent studies have strongly suggested a close phylogenetic affinity between cave-dwelling and deep-sea taxa in(More)
We investigated the effects of waterborne and maternal exposure to tributyltin (TBT) on veliger larvae of the Manila clam, Ruditapes philippinarum. In a waterborne exposure test, veliger larvae (D-larvae stage: 24h after fertilization) were exposed to TBT at measured concentrations of <0.01 (control), 0.055, 0.130, 0.340, and 0.600microg/l for 13d. The(More)
A new species of the mysid crustacean genus Gastrosaccus Norman, 1868 (Mysida, Mysidae, Gastrosaccinae) is reported from a sandy shore of Lombok Island, Indonesia. These specimens resemble G. sorrentoensis Wooldridge & McLachlan, 1986 and G. yuyu Bamber and Morton, 2012 by the possession of an articulated process on the fifth abdominal somite together with(More)
We have developed microsatellite DNA markers for Mesopodopsis orientalis (Tattersall 1908), a widely distributed mysid crustacean in shallow waters of the coastal and estuarine systems across India to Indonesia and the Philippines. A total of 18 novel polymorphic microsatellite markers were identified in 32 individuals from a sandy beach at Teluk Kumbar in(More)