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Coastal Area 13604 Adjacent waters of Ikuchijima and Innoshima islands

Basic Information A separate window opensReferences

Relevant municipalities Imabari, Kamijima, Ehime Prefecture; Mihara, Onomichi, Hiroshima Prefecture
Area (km2) 144

Reason(s) for selection A separate window opensCriteria

Selected due to high levels for the criteria 1, 3 and 7, and selected by MARXAN software.

Characteristics A separate window opensReferences

These are the waters in the vicinity of the islands around Ikuchi-jima and Inno-shima Islands and Matsunaga Bay in Hiroshima Prefecture. The river-mouth tidal mud flats in the vicinity of Matsunaga Bay are home to Gymnogobius cylindricus, mudskippers, Apocryptodon punctatus, and others (Suzuki et al., 2006; Shigeta, 2008; Shimizu et al., 2011). In addition, distribution of Urechis unicinctus, Acmaeopleura sp., Xenophthalmus pinnotheroides, Arthritica japonica and other endangered species has been confirmed off the southeast coast of Mukai Island, where parasitic Peregrinamor ohshimai also live (Itani, 2004). Around Ikuchijima and Innoshima islands are valuable because numerous natural coasts remain there, and they are spotted with eel grass beds as well (Mukai, personal communication). Eel grass beds known as Hosonosu are located on sand bars remote from the land in the Onomichi Channel in the northern part of Hososhima in the city of Onomichi, and the waters here do not ebb even during spring tide. They are distinguished by being eel grass beds formed on sand bars rather than in deep bays (Ministry of the Environment, 2001).

Environment / Habitat infromation A separate window opensData source

Tidal mud flats (km2) 3
Moba (seaweed bed) (km2) 12.6
Coral reef coverage (km2)
Natural coast (km) 140.1
Rate of natural coast (%) 31.5
Sand bank / submerged sand bank Sand bank/ submerged sand bank
Other habitats Sand bank/ submerged sand bank

Species information (*) A separate window opensData source

Criteria 1
Pinnotheres bidentatus
<Bivalva, Gastropoda>
Cryptonatica adamsiana
Orinella ebarana
Hima praematurata
Petrasma pusilla
Mucronalia exilis
Criteria 2
Neophocaena phocaenoides (Fineless porpoise)
Monticola solitarius (Blue Rock-thrush)[Br/Ne]
Egretta sacra (Pacific Reef-egret)[Br/Ne]
Ammodytes personatus (Japanese sand lance)[Sp]
Takifugu rubripes (Japanese pufferfish)[Sp]
Octopus vulgaris (Common octopus)
Criteria 3
Pinnotheres bidentatus
<Bivalva, Gastropoda>
Hima praematurata
Thracia concinna
Littorina brevicula
Tresus keenae
Mucronalia exilis
Criteria 7
Octopus minor
<Bivalva, Gastropoda>
Laternula anatina
Pinna bicolor
Solen roseomaculatus
Truncatella pfeifferi
Atrina lischkeana (Pen shell)
<Other invertebrate>
Anelassorhyncus mucosus
<Vascular Plants>
Zostera marina (Eel grass)
Zostera japonica
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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