Impact of the 2011 Tsunami on Seagrass and Seaweed Beds in Otsuchi Bay, Sanriku Coast, Japan

Komatsu, Toshimitsu; Ohtaki, Takayoshi; Sakamoto, Shingo; Sawayama, Shuhei; Hamana, Yasuaki; Shibata, Masaaki; Shibata, Kohji; Sasa, Shuji

doi:10.1007/978-3-319-13878-7_5

Cited by 18 publications

(9 citation statements)

References 31 publications

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“…However, we can examine the model predictions using a case study on the effects of particle transport on the coastal seaweed community off east Japan after the tsunami in the spring of 2011. It has been reported that the kelp forest in this area did not suffer significant impacts from the strong flow of the tsunami 51 . A large quantity of sediment particles rolled up by the tsunami were later gradually deposited on surviving kelp forest substrates 52 .…”

Section: Discussionmentioning

confidence: 75%

Effects of sediment influx on the settlement and survival of canopy-forming macrophytes

Watanabe

Ito

Matsumoto

et al. 2016

Sci Rep

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Kelp forests on coastal rocky shores are negatively impacted by sudden sediment loads that can occur with storms and floods. Using laboratory experiments, we studied the effects of sediment deposition on the survival of the large brown alga Eisenia bicyclis juveniles (zoospores and gametophytes) to quantify the potential impacts of particulate matter on kelp forests. The zoospore adhesion rate and the gametophyte survival and growth rates all declined markedly with increasing sediment load, particularly with smaller particle diameter. Using experimental results, we derived an equation to calculate the rate of initial kelp depletion with sediment load based on the quantity and size distribution of sediment particles. The equation enabled the estimation of E. bicyclis depletion rates in the field by measurement of particle quantity and diameter distribution of sediments on the reef substrate.

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Section: Discussionmentioning

confidence: 75%

Effects of sediment influx on the settlement and survival of canopy-forming macrophytes

Watanabe

Ito

Matsumoto

et al. 2016

Sci Rep

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“…This was one of the areas most affected by the huge tsunami caused by the East Japan Great Earthquake of 11 March 2011. Tsunamis are known to cause substantial damage to coastal environments and coastal seagrass meadows [49]. Although the seagrass beds in our survey area were seriously affected by the tsunami of 2011 [50,51], the seagrass meadows have recovered to some extent.…”

Section: Survey Areamentioning

confidence: 72%

Real-Time Classification of Seagrass Meadows on Flat Bottom with Bathymetric Data Measured by a Narrow Multibeam Sonar System

Hamana

Komatsu

2016

Remote Sensing

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Seagrass meadows, one of the most important habitats for many marine species, provide essential ecological services. Thus, society must conserve seagrass beds as part of their sustainable development efforts. Conserving these ecosystems requires information on seagrass distribution and relative abundance, and an efficient, accurate monitoring system. Although narrow multibeam sonar systems (NMBSs) are highly effective in resolving seagrass beds, post-processing methods are required to extract key data. The purpose of this study was to develop a simple method capable of detecting seagrass meadows and estimating their relative abundance in real time using an NMBS. Because most seagrass meadows grow on sandy seafloors, we proposed a way of discriminating seagrass meadows from the sand bed. We classify meadows into three categories of relative seagrass abundance using the 95% confidence level of beam depths and the depth range of the beam depth. These are respectively two times the standard deviation of beam depths, and the difference between the shallowest and the deepest depths in a 0.5ˆ0.5 m grid cell sampled with several narrow beams. We examined Zostera caulescens Miki, but this simple NMBS method of seagrass classification can potentially be used to map seagrass meadows with longer shoots of other species, such as Posidonia, as both have gas filled cavities.

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“…Negative impacts on seagrass beds in temperate coastal zones include decreased light availability caused by water pollution (Backman and Barilotti 1976;Koch and Beer 1996;Hauxwell et al 2006) and direct destruction by dredging and reclamation in association with coastal development (Komatsu 1997;Erftemeijer and Lewis 2006). Natural events including devastating tsunami also destroy seagrass and seaweed beds (Whanpetch et al 2010;Komatsu et al 2015;Shoji and Morimoto 2016).…”

Section: Introductionmentioning

confidence: 97%

Nutrient dynamics in core sediments of an artificial basal medium prepared with steelmaking slag and dredged materials

et al. 2016

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Impact of the 2011 Tsunami on Seagrass and Seaweed Beds in Otsuchi Bay, Sanriku Coast, Japan

Cited by 18 publications

References 31 publications

Effects of sediment influx on the settlement and survival of canopy-forming macrophytes

Effects of sediment influx on the settlement and survival of canopy-forming macrophytes

Real-Time Classification of Seagrass Meadows on Flat Bottom with Bathymetric Data Measured by a Narrow Multibeam Sonar System

Nutrient dynamics in core sediments of an artificial basal medium prepared with steelmaking slag and dredged materials

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