Effect of breakwater restoration work following the subsidence caused by the 2011 Tohoku Earthquake on the subtidal kelp population

SUMMARY We conducted a 5‐year monitoring survey of a population of Eisenia bicyclis kelp at a coastal area that suffered subsidence from the 2011 earthquake and the subsequent breakwater restoration work. Due to subsidence, the former intertidal area sank to the subtidal zone, therefore, the density...

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Bibliographic Details
Published inPhycological research Vol. 69; no. 1; pp. 3 - 11
Main Authors Suzuki, Haruka, Aoki, Tomoya, Inomata, Eri, Agatsuma, Yukio, Aoki, Masakazu N.
Format Journal Article
LanguageEnglish
Published Kyoto, Japan John Wiley & Sons Australia, Ltd 01.01.2021
Wiley Subscription Services, Inc
Subjects
Age composition
anthropogenic disturbance
Breakwaters
coastal waters
Coastal zone
Density
Earthquakes
Environmental monitoring
Intertidal zone
Kelp
landfill
Landfills
Offshore
population dynamics
reconstruction
Recruitment
Restoration
Seismic activity
Subsidence
Surveying
tagging study
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Summary:SUMMARY We conducted a 5‐year monitoring survey of a population of Eisenia bicyclis kelp at a coastal area that suffered subsidence from the 2011 earthquake and the subsequent breakwater restoration work. Due to subsidence, the former intertidal area sank to the subtidal zone, therefore, the density of E. bicyclis increased because of many recruits. However, after the restoration work, the area harboring the recruits was destroyed and landfilled. In an area that sank below the pre‐subsidence border of the kelp distribution, recruits were rare. Furthermore, an indirect effect of the restoration work was also observed on recruitment in the intact offshore kelp zone. Our results showed that the breakwater restoration work following subsidence had negative effects, not only to the density but also to the age structure of the E. bicyclis population.
ISSN:1322-0829
1440-1835
DOI:10.1111/pre.12376