Preliminary results of a three-year continuous observation by a deep seafloor observatory in Sagami Bay, central Japan

Momma, H.; Iwase, Ryoichi; Mitsuzawa, K.; Kaiho, Yuka; Fujiwara, Yoshihiro

doi:10.1016/s0031-9201(98)00107-1

Cited by 50 publications

(17 citation statements)

References 3 publications

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“…The obser vatory is located in a hydr ocarbon cold seep field of clams (Calyptogena soyoae Okutani, 1957) at a depth of 1100 m, of f the Hatsushima Island, central Japan (NW Pacific Ocean; 34°59.97'N, 139°13.69'E; Kasaya et al 2009, Momma et al 1998. The video spans 12 h (17:00 to 5:00 h, 24 June 1999), star ting 1 h prior to the fish falling and ending a few hours after.…”

Section: Cabled Observatory Video-annotations (Natural Food Fall)mentioning

confidence: 99%

Shifting feeding behaviour of deep-sea buccinid gastropods at natural and simulated food falls

Aguzzi

Jamieson

Fujii

et al. 2012

Mar. Ecol. Prog. Ser.

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The deep sea is a low food input envir onment, hence large food falls from the surface waters are important in suppor ting a wealth of scavenging deep-sea fauna. The pr obability of observing such events is ver y low, due to their unpr edictable and short-lived nature. The video system of a cabled obser vatory installed within a cold seep clam field in Sagami Bay (1100 m depth; Central Japan) recorded a rare event. We observed a fish dying directly in front of the camera and being immediately perceived and preyed upon by Buccinum yoroianum (Neo gastropoda: Buccinidae), while still alive. Up to 76 large snails responded to the fish and consumed the carcass within ~8 h, with no inter vention by decapod cr ustaceans. There was only small par ticipation of eelpouts (Zoarcidae). For comparison, we report on supplementary findings from a different area and depth of the Pacific Ocean. These obser vations were recorded by a baited camera lander which simulated a food fall. W ithin 6 h, the buccinid Tacita zenkevitchi aggregated on the bait, competing with fishes. These observations confirm that deep-sea buccinids can shift their feeding behaviour between active pr edation and scavenging. Our perception, however, seems conditioned by the observational methodology we use: buccinids may appear as scavengers when using photography (e.g. by baited landers) pr oducing single snapshots in time, or as pr edators when observed in a natural setting and video-taped continuously with a cabled observatory.

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Section: Cabled Observatory Video-annotations (Natural Food Fall)mentioning

confidence: 99%

Shifting feeding behaviour of deep-sea buccinid gastropods at natural and simulated food falls

Aguzzi

Jamieson

Fujii

et al. 2012

Mar. Ecol. Prog. Ser.

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“…There, a cabled observatory was deployed with several kinds of sensors e.g. video cameras, a CTD sensor that measures conductivity of seawater, ambient temperature and depth of water, a seismometer, since 1993 (Momma et al, 1998). The main target of the observatory is to investigate the environmental and biological phenomena of the cold seepages around the observatory that feed a large number of chemo-synthetic biological communities which are mainly consisted of Vesicomyid clam.…”

Section: Long Term Monitoring At Hatsushima Station Sagami-baymentioning

confidence: 99%

Environmental Gamma-Ray Observation in Deep Sea

Kumagai¹,

Iwase²,

Kinoshita³

et al. 2012

Gamma Radiation

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“…The observatory is composed of 3 main components: the undersea cable and observatory platform, a shore station on Hatsushima Island, and a shore station at JAMSTEC (Yokosuka City). Detailed specifications of the system are provided by Momma et al (1994Momma et al ( , 1995Momma et al ( , 1998. In situ video imagery of a vesicomyid bivalve assemblage at the Hatsushima seep environment was recorded between 17 February 1994 and 16 February 1995 using a Panasonic video camera (Model CAM-92, 3 CCD).…”

Section: Long-term Deep-sea Observatorymentioning

confidence: 99%

“…The observatory, deployed at the Off Hatsushima site in Sagami Bay, has a TV camera, a CTD and a current meter (Momma et al 1994(Momma et al , 1995(Momma et al , 1998. In the present study we used continuous in situ observations of a cold seep in Sagami Bay to investigate the behavior and periodicity of spawning by vesicomyid clams.…”

Section: Introductionmentioning

confidence: 99%

Long-term in situ monitoring of spawning behavior and fecundity in Calyptogena spp.

Fujikura¹,

Amaki²,

Barry³

et al. 2007

Mar. Ecol. Prog. Ser.

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Our knowledge of the reproductive biology and ecology of most deep-sea animals is very limited due to the logistic difficulties of deep-sea investigations. In this study, spawning by males and females of the vesicomyid bivalve Calyptogena soyoae and C. okutanii complex were observed in situ over 1 yr using the long-term deep-sea observatory located at cold seeps in Sagami Bay, Japan. Egg-and sperm-spawning events by clam aggregations occurred roughly 90 and 213 times m -2 for 1 yr, respectively, and the local population of the C. soyoae and C. okutanii complex yielded 5.8 × 10 8 eggs m -2 yr -1 into the water column over the seep location studied. Males displayed a 'sprinkle siphon' behavior, waving their siphons left and right to sprinkle sperm into the water. Female spawning by egg release into the water column was always preceded by male spawning and decreasing near-bottom current speeds. Two hypotheses are proposed for cues to stimulate egg release by C. soyoae/okutanii females. First, a 'double trigger' hypothesis requires the presence of sperm in the water column and decreasing current speed before eggs are released. Second, a 'single trigger' hypothesis requires that egg release is induced when compounds in or released with sperm exceed a threshold concentration. These results demonstrate the utility of long-term observatories for studies of deep-sea reproductive biology, particularly for species characterized by rare, episodic spawning events.

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Preliminary results of a three-year continuous observation by a deep seafloor observatory in Sagami Bay, central Japan

Cited by 50 publications

References 3 publications

Shifting feeding behaviour of deep-sea buccinid gastropods at natural and simulated food falls

Shifting feeding behaviour of deep-sea buccinid gastropods at natural and simulated food falls

Environmental Gamma-Ray Observation in Deep Sea

Long-term in situ monitoring of spawning behavior and fecundity in Calyptogena spp.

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