First insight of bathymetric patterns among deep-sea harpacticoid diversity and composition on landward slopes of subduction zones along the Japanese island arc

Shimanaga, Motohiro; Kitahashi, Tomo; Kawamura, Kazutaka

doi:10.1007/s10872-019-00516-7

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“…There were general bathymetric trends in harpacticoid community composition on the (non-vent) deep-sea bottom from the upper bathyal to abyssal depths (400-5800 m) along the Pacific side of the Japanese island arc, where Ectinosomatidae was the most abundant family at upper bathyal depth, but was consistently decreased with increasing water depth (Shimanaga et al, 2019). This trend could at least partly explain the observation of the highest frequencies of Ectinosomatidae on vent chimneys in the caldera of Bayonnaise Knoll, which has the shallowest depths (770 m on average) among the three knolls investigated in this study.…”

Section: Discussionmentioning

confidence: 97%

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Simple harpacticoid composition observed at deep hydrothermal vent sites on sea knoll calderas in the North-west Pacific

et al. 2021

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Dirivultid copepods (Siphonostomatoida), one of the most successful meiobenthic organisms found at deep-sea hydrothermal vents, have been the focus of most previous ecological studies among meiofauna in these habitats. The ecology of Harpacticoida, a major benthic copepod group in typical deep-sea floor, however, is not well understood in terms of variations in community structure and controlling factors at venting sites. The spatial heterogeneities in benthic harpacticoid composition and their association with environmental parameters were investigated at hydrothermal vent chimney structures in the calderas of three neighbouring sea knolls (Bayonnaise Knoll, Myojin Knoll and Myojin-sho Caldera) in the western North Pacific. While a previous study had reported the distribution of dirivultids was strongly associated with spatial differences in stable carbon isotopic signatures (δ13C) of organic matter in the detritus on active chimneys in the field, multivariate analyses detected no significant corelation between the parameter and harpacticoid composition in this study. Instead, high associations of the harpacticoid composition with differences in water depth and total organic carbon (TOC) concentration were detected. Ectinosomatidae dominated at vent sites with lower TOC values in the shallowest Bayonnaise Knoll, while they were less prevalent at deeper vent fields in the other knolls, where Miraciidae was the most abundant family. This study indicated the availability of vent chemoautotrophic carbon is not a primary factor controlling the composition of harpacticoids even in the habitats on the hydrothermal vents, but instead by the food amount, regardless of its resources (including marine snow from the sea surface), in the study area.

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Section: Discussionmentioning

confidence: 97%

“…Bathymetric changes in community composition have been reported among benthic harpacticoids at the (non-vent) deepsea bottom (e.g. Shimanaga et al, 2019). The mean depths at sampling sites in Bayonnaise Knoll, Myojin-sho Caldera and Myojin Knoll were 768, 811 and 1274 m, respectively (cf.…”

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confidence: 97%