DOI: 10.1002/2017JC013746
Scopus记录号: 2-s2.0-85042357436
论文题名: Lasting Impact of a Tsunami Event on Sediment-Organism Interactions in the Ocean
作者: Seike K. ; Sassa S. ; Shirai K. ; Kubota K.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1376
结束页码: 1392
语种: 英语
英文关键词: benthos
; bioturbation
; event
; sedimentation
; substrate
; tsunami
Scopus关键词: benthic environment
; benthos
; bioturbation
; echinoderm
; extreme event
; grain size
; sediment core
; sedimentation
; topography
; tsunami
; Japan
; Pacific Coast [Japan]
; Echinocardium cordatum
; Echinoida
; Invertebrata
英文摘要: Although tsunami sedimentation is a short-term phenomenon, it may control the long-term benthic environment by altering seafloor surface characteristics such as topography and grain-size composition. By analyzing sediment cores, we investigated the long-term effect of the 2011 tsunami generated by the Tohoku Earthquake off the Pacific coast of Japan on sediment mixing (bioturbation) by an important ecosystem engineer, the heart urchin Echinocardium cordatum. Recent tsunami deposits allow accurate estimation of the depth of current bioturbation by E. cordatum, because there are no preexisting burrows in the sediments. The in situ hardness of the substrate decreased significantly with increasing abundance of E. cordatum, suggesting that echinoid bioturbation softens the seafloor sediment. Sediment-core analysis revealed that this echinoid rarely burrows into the coarser-grained (medium-grained to coarse-grained) sandy layer deposited by the 2011 tsunami; thus, the vertical grain-size distribution resulting from tsunami sedimentation controls the depth of E. cordatum bioturbation. As sandy tsunami layers are preserved in the seafloor substrate, their restriction on bioturbation continues for an extended period. The results demonstrate that understanding the effects on seafloor processes of extreme natural events that occur on geological timescales, including tsunami events, is important in revealing continuing interactions between seafloor sediments and marine benthic invertebrates. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114513
Appears in Collections: 气候减缓与适应
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作者单位: Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; Now at Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan; Port and Airport Research Institute, National Institute of Maritime, Port and Aviation Technology, Yokosuka, Japan; Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Nankoku, Japan
Recommended Citation:
Seike K.,Sassa S.,Shirai K.,et al. Lasting Impact of a Tsunami Event on Sediment-Organism Interactions in the Ocean[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)