Abstract
We investigated impacts of the Great East Japan Earthquake and Tsunami on population dynamics of molluskan species and the recovery processes on the Tona coast in Matsushima Bay and shallow sea in Sendai Bay, Miyagi Prefecture, northeastern Japan. On the Tona coast, Ruditapes philippinarum, Macoma incongrua, Pillucina pisidium, and Batillaria cumingii were always common for 10 years before the tsunami (2001–2010), although R. philippinarum and M. icongrua decreased in number as a result of selective predation after arrival of an alien predator Laguncula pulchella in 2002. After the tsunami, all of the above five species drastically decreased in July 2011, but R. philippinarum and M. incongrua rapidly recovered from 2012 to 2013. Furthermore, Musculista senhousia and Mya (Arenomya) arenaria oonogai, those were low density before the tsunami, temporarily appeared on the Tona coast in July 2011 and then decreased till June 2013. These results suggest that the molluskan populations on the Tona coast are damaged by the tsunami and the other opportunistic species increased instead of them, but they quickly recovered for 2 or 3 years. By contrast, in the shallow sea of Sendai Bay, only Raetellops pulchellus increased at 1 year after the tsunami (July to November 2012), but mean individual density of bivalves decreased 2 years after the tsunami (March 2013). In the shallow sea, the recovery processes of molluskan populations may be slower than those in the coastal area.
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Acknowledgments
This study was supported in part by grants from Tohoku Ecosystem-Associated Marine Sciences. The authors are grateful to J. Urabe (Tohoku University) for the invitation to contribute on this chapter. We thank H. Hasegawa (Hosho High School) for providing the valuable data. We also would like to thank the staff of the Naruse Branch (Higashi-Matsushima City) and Sendai Branch of Japan Fisheries Cooperative for their help in collecting samples. The 2011 Tohoku earthquake and tsunami struck Higashi-Matsushima City and Sendai City and caused serious damage there. We sincerely pray for a quick recovery.
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Sato, S., Chiba, T. (2016). Ecological Impacts and Recovery of Molluskan Populations After the Tsunami Struck Around Matsushima Bay and Sendai Bay, Miyagi Prefecture, Northeastern Japan. In: Urabe, J., Nakashizuka, T. (eds) Ecological Impacts of Tsunamis on Coastal Ecosystems. Ecological Research Monographs. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56448-5_13
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DOI: https://doi.org/10.1007/978-4-431-56448-5_13
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