Monitoring of intertidal fauna and flora on rocky shore and pier wall in southern Iwate
Period and Interval2013/04/01 - 2014/03/31
Once a year in Yoshihama bay, every three months at Ofunato bay
Research Area
Yoshihama bay, Ofunato bay
CategoryField survey
OverviewWe examine fauna and flora of intertidal organisms in rocky shore and pier wall to estimate the impact of the 2011 disater and monitor the recovery process from it by video camera in case for vertical pier wall. We also survey an alien barnacle which was found after the disaster in northeast Honsyu Japan and examine its expansion in relation to anthropogenic activities by restorations from the disaster.
Research Point Table
| Point | | Name | Funasaku beach, Yoshihama Bay |
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| Coordinates | 39.116822,141.872937 |
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| Name | Kamihira, Ofunato Bay. |
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| Coordinates | 39.045366,141.724214 |
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| Remarks | 90 ports in northen Japan.Niigata, Yamagata, Akita, Iwate and Miyagi Pref. |
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Research Point Map & Track Chart Map & Point List
Results and Future PlanBiodiversity at Funasaku in Yoshihama Bay, number of algal species in intertidal region was fifteen (July, 2012) and seventeen (June, 2013) in comparison with forty (2003-2005) in number before the Great East Japan Earthquake. On the other hand, number of intertidal common invertebrate species was twenty-five (August, 2012) and twenty-eight (August, 2013) in comparison with thiry-eight in number before the earthquake.
Before the Earthquake, an alien barnacle Balanus glandula was dominant, and the native barnacle Fistulobalanus albicostatus remained upper fringe of B. glandula zone. After the disaster, situation dominated by B. glandula did not change, but proportion of Chthamalus challengeri, Semibalanus cariosus which lived outside port became increased probably because increment of exchange rate of seawater inside the bay due to damages of large breakwaters constructed at the bay mouth by the Tsunami.
Distribution of a new alien barnacle Perforatus perforatus was surveyed at 90 ports around northern Honshu, Japan. P. perforatus was common alongside of the Japan Sea side, while it was uncommon along the Pacific side. At the present, southern limits was Uwozu fishing port in Niigata Prefecture in the Japan Sea side, Shizuhama fishing port in Miyagi Prefecture in the Pacific side, respectively.
