Effects of sediment hardness on the upper limit of the distribution of the burrowing amphipod Haustorioides japonicus on sandy shores: a field evaluation

Takada, Yoshitake; Kajihara, Naoto; Sassa, Shinji

doi:10.3800/pbr.8.195

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…The low density of the sediment reflects a high water content and soft substrate; however, sediment density does not directly reflect substrate hardness. A unique and important feature of the vane shear testing employed in this study is that the method is capable of measuring the hardness of sediment in an undisturbed state (Sassa et al, ), thereby guaranteeing that the vane shear strength yields a better representation of the benthic environment compared with other measurement methods such as digital force gauges and cone penetrometers (Takada et al, ). Our in situ measurement results therefore confirm that sediment mixing by E. cordatum affects substrate hardness.…”

Section: Discussionmentioning

confidence: 99%

Lasting Impact of a Tsunami Event on Sediment‐Organism Interactions in the Ocean

et al. 2018

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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.

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Section: Discussionmentioning

confidence: 99%

Lasting Impact of a Tsunami Event on Sediment‐Organism Interactions in the Ocean

et al. 2018

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Zonation of macrofaunal assemblages on microtidal sandy beaches along the Japan Sea coast of Honshu

Takada

Kajihara

Iseki

et al. 2016

Plankton Benthos Res

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Zonation has been a major focus of intertidal ecology. In general, sandy beaches are thought to have three zones (supralittoral, littoral, and sublittoral zones). In the present study, 41 areas of sandy beaches were surveyed along the Japan Sea coast of Honshu (from Aomori to Yamaguchi Prefectures) characterized by a small tidal range, large seasonal fluctuations in the mean tide level, and harsh wind-driven waves in winter, and the applicability of the three-zone scheme was examined. Overall, a total of 316 beach stations were surveyed, 28 taxonomic units were identified, and the most abundant species was the amphipod Haustorioides japonicus. The taxonomic units were grouped using multivariate techniques into a total of 7 assemblages, and the relationship of these assemblages to zonation was examined. Investigation of the indicator species of the 7 assemblages and their vertical position on the beaches showed that one assemblage corresponded to the supralittoral zone (indicators were talitrid amphipods and the isopod Tylos granuliferus). Another assemblage corresponded to the sublittoral zone, and the other five assemblages to the littoral zone. The assemblage of the sublittoral zone tended to disappear on the northern beaches, while one of the littoral assemblages whose indicators included a mysid species, Archaeomysis kokuboi, tended to occur on the northern beaches. Thus, the three-zone scheme can be applied to sandy beaches of the Japan Sea, but there are large variations among the beaches.

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Universality of the linkage between geoenvironment and the distributions of three Haustorioides amphipods: H. japonicus, H. munsterhjelmi, and H. koreanus

Yang

Sassa

Takada

2019

Plankton Benthos Res

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It is known that suction, namely, the tension of moisture in sediments, governs the distribution of the sandy beach amphipod Haustorioides japonicus, which occurs on the intertidal zones of open sandy beaches. Against this background, field studies were conducted to investigate whether there is a universal linkage between the suction and the distributions of three Haustorioides species, H. japonicus, H. munsterhjelmi, and H. koreanus, and to clarify the relationship between the distribution of these three species on shores and the variation in suction associated with the tide-induced variation in groundwater level. The study sites were as follows: Maze and Gokahama beaches, located on the coast of the Sea of Japan in Honshu, Japan and Tsuyazaki beach on the coast of the Genkai Sea in Kyushu, Japan for H. japonicus; Shari beach in Hokkaido, Japan for H. munsterhjelmi; and Samyang beach on Jeju Island, South Korea for H. koreanus. The field sites had different tidal ranges, from 0.2 to 2.81 m. The obtained results showed that the suction governed the variations of the habitat geophysical environments (degree of saturation, sediment compaction, water content, and sediment hardness) of surficial sediments in sandy beaches, and the distributions of the three Haustorioides species are associated with particular suctions, irrespective of the differences among the three Haustorioides species, the differences in tidal ranges, and the variations in tidal level. In addition, the tidal migrations of H. japonicus and H. munsterhjelmi were caused by shifts in their suitable zones for burrowing.

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Effects of sediment hardness on the upper limit of the distribution of the burrowing amphipod Haustorioides japonicus on sandy shores: a field evaluation

Cited by 3 publications

References 10 publications

Lasting Impact of a Tsunami Event on Sediment‐Organism Interactions in the Ocean

Lasting Impact of a Tsunami Event on Sediment‐Organism Interactions in the Ocean

Zonation of macrofaunal assemblages on microtidal sandy beaches along the Japan Sea coast of Honshu

Universality of the linkage between geoenvironment and the distributions of three <i>Haustorioides</i> amphipods: <i>H. japonicus</i>, <i>H. munsterhjelmi</i>, and <i>H. koreanus</i>

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