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Coastal Area 13708 Adjacent waters of Iwaijima and Nagashima islands

Basic Information A separate window opensReferences

Relevant municipalities Hikari, Kaminoseki, Tabuse, Hirao, Yamaguchi Prefecture
Area (km2) 253

Reason(s) for selection A separate window opensCriteria

Selected by MARXAN software.

Characteristics A separate window opensReferences

These are the waters surrounding Iwai and Nagashima Islands in the vicinity of the town of Kaminoseki, Yamaguchi Prefecture. In Yamaguchi Prefecture's Hirao Bay (from the town of Tabuse to the town of Hirao) live small-scale whiting (Shigeta, 2008; Shigeta et al., 2013 in print; Shigeta and Usuki, 2011), and at the mouth of the Tabuse River live Asian clams (Shigeta, not yet published). In addition, Hirao Bay and nearby waters include habitat and breeding grounds of Japanese horseshoe crab (Japanese Association of Benthology, 2012; Yamaguichi Japanese Horseshoe Crab Research Conference). The coast in the vicinity of Nagashima, Iwai, and Uwajima hold many natural coasts with no embankment work, and in such places the past biodiversity of the Seto Inland Sea remains strong. On the reef coasts Sargassum beds develop very strongly and are highly productive. The channel separating Iwai Island from Nagashima Island is famous as a fishing round for sea bream, and finless porpoise and Japanese murrelet have been spotted here. A streaked shearwater breeding ground has been found in Uwajima Island (Ecological Society of Japan Kaminoseki Follow-up Committee, 2010).

Environment / Habitat infromation A separate window opensData source

Tidal mud flats (km2)
Moba (seaweed bed) (km2) 2.5
Coral reef coverage (km2)
Natural coast (km) 71
Rate of natural coast (%) 58.3
Sand bank / submerged sand bank
Other habitats

Species information (*) A separate window opensData source

Criteria 2
Neophocaena phocaenoides (Fineless porpoise)
Sterna albifrons (Little Tern)
Sterna albifrons (Little Tern)[Br/Ne]
Ammodytes personatus (Japanese sand lance)[Sp]
Paralichthys olivaceus (Bastard halibut)[Sp]
Pagrus major (Red seabream)[Sp]
<Crustacea, Horseshoe club>
Tachypleus tridentatus (Horseshoe club)
Octopus vulgaris (Common octopus)
Criteria 3
Sterna albifrons (Little Tern)
<Vascular Plants>
Suaeda malacosperma
Criteria 7
<Crustacea, Horseshoe club>
Tachypleus tridentatus (Horseshoe club)
<Vascular Plants>
Aster tripolium (Sea aster)
Suaeda malacosperma
Artemisia fukudo

* This is the species list of which meet the criteria. In that matter, this list does not include all species that inhabit the individual area.
Abbreviation in the information is as follows.
[Br/Ne] : Adjacent water of breeding area or nesting site
[Sp] : spawning area
[Ad] : species not used for analysis but add to the list because inhabit information was collected later
[Ex] : species used for analysis but considered to be possibly extinct in the EBSA region (area)
No mark : data of species distribution


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