Impacts of the 2011 Mega-earthquake and Tsunami on Ezo Abalone Haliotis discus hannai at Iwaisaki, Miyagi, Japan

Takami, Hideki; Nakaie, Hiroshi

doi:10.1007/978-3-319-13878-7_2

Cited by 14 publications

(33 citation statements)

References 5 publications

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“…However, this does not mean that macroalgal beds and their associated organisms were little influenced by the tsunami (Kawamura et al, ). Several researchers reported that densities of abalone and sea urchins decreased because of the great turbulence caused by the tsunami (Takami et al, , Kawamura et al, ), and some species have not recovered yet in Tohoku region (Kawamura et al ). Moreover, there is concern that very turbid water resulting from the tsunami led to a decrease in growth and recruitment of the benthic fisheries resources (Takami et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…A massive tsunami generated by the earthquake hit a wide area of the Pacific coast of northeastern Japan. Many studies examining the effects of the tsunami on coastal ecosystems have been reported (e.g., Seike et al, , Takami et al, , Kawamura et al, ). Most of these studies (except for that of the Biodiversity Center of Japan ()), however, were limited to local sites, owing to the logistical limitations of direct observations.…”

Section: Introductionmentioning

confidence: 99%

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Estimating the change in regional scale distribution of seagrass and macroalgal beds using discrete local distribution data analyzed from aerial images

Hamaoka

Kamiyama

Hori

2020

Ecological Research

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The sensitivity of vegetated habitats to climate change and catastrophic disturbance, as well as their benefits to human beings, motivate efforts to estimate regional changes in distribution. This study examined the regional changes in the distribution of submerged macrophyte vegetation using aerial and satellite images from before and after the 2011 tsunami disturbance along the Pacific coast of northeastern Japan. We conducted an estimation of the change in the distribution of seagrass and macroalgal beds after the tsunami along the whole coastline (1,635 km). This was based on vegetation change in the 13 local areas (each <40 km) spanning 27% of the coastline and included 28% of the macroalgal area and 59% of the seagrass area documented in satellite imagery before the tsunami, using generalized linear modeling (GLM). We found that in the 13 local areas 716.8 and 1,990.3 ha of macroalgal beds and seagrass beds had disappeared, respectively, suggesting that seagrass beds were more impacted by the tsunami than macroalgal beds. Significant predictors in GLM indicated that more seagrass beds disappeared in geographically complex coastal areas, whereas macroalgal beds were only marginally affected in such areas. It was estimated that the total decline in seagrass beds was at least 76% along the whole coastline, whereas macroalgal beds decreased only by about 20%. The magnitude and predictors of losses in these two vegetated habitats were similar to earlier estimates, suggesting that our simplified method with GLM is sufficient to extrapolate monitoring data to a regional scale. K E Y W O R D Scatastrophic disturbance, coastal geographical characteristics, generalized linear modeling, submerged macrophyte vegetation

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimating the change in regional scale distribution of seagrass and macroalgal beds using discrete local distribution data analyzed from aerial images

Hamaoka

Kamiyama

Hori

2020

Ecological Research

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“…The tsunami generated by this earthquake severely impacted the coastal ecosystems of northeastern Honshu Island. In our previous studies (Takami et al ., ; Kawamura et al ., ), the direct impacts of this earthquake and tsunami on populations of the abalone Haliotis discus hannai and sea urchin Mesocentrotus nudus in the rocky shore ecosystem at Tomarihama on the east coast of the Oshika Peninsula are reported by comparing data between the period before and after the tsunami event. Before the event, algal forests occurred in the survey area shallower than 5 m in depth, which formed a habitat for adult abalone.…”

Section: Introductionmentioning

confidence: 98%

“…Juvenile abalone and sea urchins inhabited the deeper area dominated by crustose coralline algae (CCA). The impact of the tsunami was more significant in the CCA area than in the macroalgal forest with the juvenile abalone and sea urchins inhabiting the CCA habitat dramatically decreased just after the event (Takami et al ., ; Kawamura et al ., ).…”

Section: Introductionmentioning

confidence: 98%

“…The strong grazing pressure of the sea urchin M. nudus , which densely inhabited CCA areas before the tsunami, removed macroalgae including new macroalgal recruits on CCA surfaces leaving the grazing resistant CCA (Sano et al ., ; Muraoka, ). Therefore, the large‐scale removal of the sea urchin because of the tsunami disturbance was also predicted to change the spatial distribution of the algal communities (Takami et al ., ; Kawamura et al ., ; Muraoka et al ., ). Consequently, the transition between macroalgal forests and CCA habitats would mediate the recruitment strength of juvenile abalone as suggested for other abalone species (Aguirre and McNaught, ).…”

Section: Introductionmentioning

confidence: 99%

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Effects of macroalgal expansion triggered by the 2011 earthquake and tsunami on recruitment density of juvenile abalone Haliotis discus hannai at Oshika Peninsula, northeastern Japan

Takami

Kawamura

Won

et al. 2016

Fisheries Oceanography

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The effects of the 2011 mega‐earthquake and massive tsunami on the recruitment process of juvenile abalone Haliotis discus hannai inhabiting the rocky shore ecosystem were investigated at Oshika Peninsula, northeastern Japan. Before the earthquake and tsunami, H. discus hannai of 2007–2010 yr classes were shown to undergo habitat shifts with growth from the crustose coralline algal area (CCA) to kelp beds (KB) via algal turfs (AT). These habitat shifts of abalone appear to occur because of its migration, associated with the ontogenetic changes in feeding behavior. Densities of 0‐yr‐old juvenile abalone (2010 yr class) and the sea urchin Mesocentrotus nudus inhabiting the CCA largely decreased just after the earthquake and tsunami, mainly affected by the catastrophic disturbance by this event. After that, previously unrecorded recruitments of juvenile macroalgae were observed in the CCA after the event probably because of the large‐scale removal of the primary herbivore, the sea urchin M. nudus. Subsequently, the KB and AT expanded into the previous CCA area. After the tsunami, the major factors causing the continuously low densities of the 0‐yr‐old juvenile abalone (2011–2013 yr classes) are inferred to be the limited nursery CCA habitat because of mud and silt sedimentation, the expansion of the KB and AT, and/or the decreased densities of reproductive adult abalone due to the direct disturbance of the tsunami. The results of this study imply that maintaining diverse algal communities which enable the habitat shifts of juvenile abalone H. discus hannai is one of the crucial factors to their successful recruitment.

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The Coastal Environment and the Reconstruction Process After the Great East Japan Earthquake: A Few Notes

Santiago-Fandiño¹,

Mas

2017

Advances in Natural and Technological Hazards Research

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Impacts of the 2011 Mega-earthquake and Tsunami on Ezo Abalone Haliotis discus hannai at Iwaisaki, Miyagi, Japan

Cited by 14 publications

References 5 publications

Estimating the change in regional scale distribution of seagrass and macroalgal beds using discrete local distribution data analyzed from aerial images

Estimating the change in regional scale distribution of seagrass and macroalgal beds using discrete local distribution data analyzed from aerial images

Effects of macroalgal expansion triggered by the 2011 earthquake and tsunami on recruitment density of juvenile abalone Haliotis discus hannai at Oshika Peninsula, northeastern Japan

The Coastal Environment and the Reconstruction Process After the Great East Japan Earthquake: A Few Notes

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