Quantitative studies on the smaller macrobenthos inhabiting various topographical environments around the Sagami bank in the deep-sea system of Sagami Bay

1970 ◽  
Vol 26 (3) ◽  
pp. 159-182 ◽  
Author(s):  
Masuoki Horikoshi
Keyword(s):  
Deep Sea ◽  
Sagami Bay ◽  
Quantitative Studies

A new deep-sea species of the caridean genus Bresilia Calman, 1896 (Crustacea: Decapoda: Bresiliidae) from Sagami Bay, central Japan

Zootaxa ◽  
2017 ◽  
Vol 4299 (3) ◽  
pp. 405
Author(s):  
TOMOYUKI KOMAI ◽  
HISANORI KOHTSUKA
Keyword(s):  
New Species ◽  
Shallow Water ◽  
Deep Sea ◽  
Ovigerous Female ◽  
Ventral Surface ◽  
Ryukyu Islands ◽  
Female Specimen ◽  
Sagami Bay ◽  
Central Japan ◽  
A New Species

A new species of the rare caridean genus Bresilia Calman, 1896, B. cinctus, is described and illustrated on the basis of a single ovigerous female specimen collected from Sagami Bay, central Japan, at 218–318 m depth. The new species is morphologically most similar to B. rufioculus Komai & Yamada, 2011, known only from shallow water cave of Ie Island (depths 14–17 m), Okinawa Islands, Ryukyu Islands, but many characters, including the proportionally shorter rostrum, the well developed suborbital lobe of the carapace, and the presence of a spiniform seta on the ventral surface of the pereopod 1 palm, immediately distinguish the new species from B. rufioculus. Bresilia cinctus n. sp. is the first species of the genus known from the Japanese main islands. The discovery of the new species led us to reassess the merit of the informal division of Bresilia proposed by Komai & Yamada (2010). An identification key to the ten named species of Bresilia is presented. 

scholarly journals A new species of the genus Cerviniopsis from Sagami Bay, Japan and reinstatement of the genus Neocervinia, with a report on the male of Neocervinia itoi Lee & Yoo, 1998 (Copepoda: Harpacticoida: Aegisthidae)

Zootaxa ◽  
2012 ◽  
Vol 3575 (1) ◽  
pp. 27 ◽  
Author(s):  
EUN-OK PARK ◽  
MOTOHIRO SHIMANAGA ◽  
SUK HYUN YOON ◽  
WONCHOEL LEE
Keyword(s):  
New Species ◽  
Deep Sea ◽  
Distal Margin ◽  
Sexually Dimorphic ◽  
Sagami Bay ◽  
Genital Segment ◽  
Male Characters ◽  
Superficial Resemblance ◽  
Caudal Rami ◽  
A New Species

A new aegisthid copepod, Cerviniopsis reducta sp. nov. is described from the deep sea in Sagami Bay, Japan. The newspecies has superficial resemblance to C. minutiseta Ito, 1983 in the armature formula of swimming legs. However theydiffer from each other in the shape of setae of the swimming legs, the distal margin of operculum, length of caudal rami,and the location of setae on P5 exopod. Also, the male of Neocervinia itoi Lee & Yoo, 1998 is described on the basis ofsamples collected from around the type locality in Sagami Bay, Japan. Sexual dimorphism of N. itoi male can be observedin the fused rostrum, atrophied mouthparts, P5, and P6. The sixth leg is symmetrical and both gonopores are presumablyactive, based on the presence of two spermatophores internally in the genital segment. This paper reports for the first timeon the sexually dimorphic characters in the genus Neocervinia Huys, Mobjerg & Kristensen, 1997, reinstating its generic status with the newly revealed male characters.

Sea Trial Results of ROV “ABISMO” for Deep Sea Inspection and Sampling

2008 ◽  
Author(s):  
Tomoya Inoue ◽  
Hiroyuki Osawa ◽  
Hiroshi Yoshida ◽  
Junichiro Tahara ◽  
Shojiro Ishibashi ◽  
...  
Keyword(s):  
Water Depth ◽  
Deep Sea ◽  
Earth Science ◽  
Sagami Bay ◽  
Sampling System ◽  
Sediment Samples ◽  
Sea Trial ◽  
The Third ◽  
Onboard Equipment ◽  
Water Depths

JAMSTEC (Japan Agency for Marine-Earth Science and Technology) has been developing the deep sea ROV ABISMO (Automatic Bottom Inspection and Sampling Mobile) having the capability to dive to the deepest sea. The purposes of ABISMO are to inspect on the seabed in the deep sea and to obtain sediment samples from there. ABISMO consists of a launcher and a vehicle which is launched from the launcher and surveys on the seabed to determine the place for sampling. Core sampling system, which is exchangeable with a gravity piston type or a grab type, is equipped in the launcher. The both of the launcher and the vehicle have cameras to observe. One of the features of ABISMO is that the vehicle has crawlers in addition to thrusters in order to advance mobility. ABISMO is operated with the support ship KAIREI and dived by means of its onboard equipment including a primary cable. We conducted sea trials in January and September 2007 at the areas with the water depths up to 1,300m in Sagami Bay as primary function tests. And we conducted the third sea trial at Izu-Ogasawara trench in December 2007 and made the successful results of diving to the depths up to 9707 m and obtaining a sediment sample from the seabed in 9760 m water depth. This paper describes the features and the outline of ABISMO as well as the sea trial results.

scholarly journals Detection of Odor Compounds in Deep-sea Sediment Cores from Sagami Bay and Izu-Bonin Trench using Gas Chromatography-olfactometry (GC-O)

2020 ◽  
Vol 30 (0) ◽  
pp. 94-99
Author(s):  
Misato MATSUMOTO ◽  
Hidetaka NOMAKI ◽  
Shinsuke KAWAGUCCI ◽  
Yuki KOGA ◽  
Taiki HIGUCHI ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Deep Sea ◽  
Sediment Cores ◽  
Sagami Bay ◽  
Deep Sea Sediment ◽  
Gas Chromatography Olfactometry ◽  
Odor Compounds

Two new deep-sea species of the genus Henricia (Asteroidea: Spinulosida: Echinasteridae) from Japanese waters

Zootaxa ◽  
2021 ◽  
Vol 4903 (1) ◽  
pp. 89-104
Author(s):  
ITARU KOBAYASHI ◽  
HISANORI KOHTSUKA ◽  
TOSHIHIKO FUJITA
Keyword(s):  
New Species ◽  
Deep Sea ◽  
Sagami Bay ◽  
Ogasawara Islands ◽  
Two New Species ◽  
Japanese Waters

Two new deep-sea Henricia species, Henricia margarethae n. sp. and Henricia fragilis n. sp. are described from Sagami Bay and the Ogasawara Islands in Japan. The two new species show an affinity with eight congeners in having multiple furrow spines and abactinal papular areas which are larger than surrounding plates. The two species described herein are characterized by the arrangement of abactinal pseudopaxillae, the arrangement of abactinal papulae, the shape and arrangement of abactinal spines, the length of intermarginal and ventrolateral series, and the armament of superomarginal, inferomarginal, and adambulacral plates. 

scholarly journals Nomimicins B–D, new tetronate-class polyketides from a marine-derived actinomycete of the genus Actinomadura

2021 ◽  
Vol 17 ◽  
pp. 2194-2202
Author(s):  
Zhiwei Zhang ◽  
Tao Zhou ◽  
Taehui Yang ◽  
Keisuke Fukaya ◽  
Enjuro Harunari ◽  
...  
Keyword(s):  
Deep Sea ◽  
Sea Water ◽  
Analytical Data ◽  
Leukemia Cells ◽  
Sagami Bay ◽  
Gram Positive Bacteria ◽  
Culture Extract ◽  
Floating Particles ◽  
Murine Leukemia ◽  
Kocuria Rhizophila

Three new tetronate-class polyketides, nomimicins B, C, and D, along with nomimicin, hereafter named nomimicin A, were isolated from the culture extract of Actinomadura sp. AKA43 collected from floating particles in the deep-sea water of Sagami Bay, Japan. The structures of nomimicins B, C, and D were elucidated through the interpretation of NMR and MS analytical data, and the absolute configuration was determined by combination of NOESY/ROESY and ECD analyses. Nomimicins B, C, and D showed antimicrobial activity against Gram-positive bacteria, Kocuria rhizophila and Bacillus subtilis, with MIC values in the range of 6.5 to 12.5 μg/mL. Nomimicins B and C also displayed cytotoxicity against P388 murine leukemia cells with IC50 values of 33 and 89 μM, respectively.

scholarly journals AMS 14C Measurements of Dissolved Inorganic Carbon in Pore Waters from a Deep-Sea “Cold Seep” Giant Clam Community Off Hatsushima Island, Sagami Bay, Japan

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 617-627 ◽  
Author(s):  
Toshiyuki Masuzawa ◽  
Hiroyuki Kitagawa ◽  
Takeshi Nakatsuka ◽  
Nobuhiko Handa ◽  
Toshio Nakamura
Keyword(s):  
Deep Sea ◽  
Inorganic Carbon ◽  
Hydrogen Reduction ◽  
Dissolved Inorganic Carbon ◽  
Cold Seep ◽  
Sediment Surface ◽  
Giant Clam ◽  
Pore Waters ◽  
Sagami Bay ◽  
Chemoautotrophic Bacteria

We collected pore waters using an in situ pore water-squeezer for a submersible Shinkai 2000 at six depths beneath the sediment surface within a deep-sea “cold seep” giant clam community off Hatsushima Island, Sagami Bay, Japan. A box core sample was also collected ca. 4.5 km east of the community and pore waters were separated. Dissolved inorganic carbon (DIC) was extracted and purified in a vacuum line and 14C concentration was determined with a Tandetron accelerator mass spectrometer at Nagoya University after conversion to graphite targets using a batch Fe-catalytic hydrogen reduction method. ∆14C values decreased with increasing depth to −938‰ at the sulfate concentration minimum. This indicates that methane used for the active reduction of sulfate and formation of hydrogen sulfide, which is used by symbiotic chemoautotrophic bacteria in gills of the giant clams, is almost dead and is likely supplied from the deep. ∆14C values of DIC vary linearly with δ13C values along a mixing line between that in the bottom water and that produced by the oxidation of dead methane. The δ13C value of DIC oxidized from dead methane is estimated to be ca. −45‰.

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