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Coastal Area 21101 Yonaguni Island

Basic Information A separate window opensReferences

Relevant municipalities Yonaguni, Okinawa Prefecture
Area (km2) 53

Reason(s) for selection A separate window opensCriteria

Selected due to high levels for the criteria 1, 4 and 7, and selected by MARXAN software.

Characteristics A separate window opensReferences

These are the waters in the vicinity of Yonaguni Island. In the winter, hammerhead sharks can be seen off Irizaki Cape. These waters are habitat to a large population of Octocorallia coral, and the waters in the vicinity of the island include breeding grounds for roseate tern and black-naped tern.

Environment / Habitat infromation A separate window opensData source

Tidal mud flats (km2)
Moba (seaweed bed) (km2) 0.2
Coral reef coverage (km2) 0.2
Natural coast (km) 30.9
Rate of natural coast (%) 83.3
Sand bank / submerged sand bank
Other habitats

Species information (*) A separate window opensData source

Criteria 1
Sarcophyton crassocaule
Criteria 2
Chlidonias hybrida (Whiskered Tern)
Chlidonias leucopterus (White-winged Tern)
Criteria 3
Ophieleotris sp. 
Ophiocara porocephala (Northern mud gudgeon)
<Bivalva, Gastropoda>
Stenomelania uniformis
Stenomelania juncea
Galaxea astreata
Heliopora coerulea
Montipora calcarea
Porites nigrescens
Turbinaria reniformis
Criteria 4
Briareum violacea
Cladiella pachyclados
Clavularia inflata
Isis hippuris
Lobophytum crassum
Lobophytum venustum
Protodendron repens
Sarcophyton crassocaule
Sarcophyton ehrenbergi
Sarcophyton glaucum
Sarcophyton tenuispiculatum
Sarcophyton trocheliophorum
Sinularia erecta
Sinularia gravis
Sinularia higai
Sinularia leptoclados
Sinularia mollis
Sinularia numerosa
Sinularia ovispiculata
Sinularia parva
Sinularia tanakai
Sinularia vrijmoethi
Tubipora musica
Criteria 7
<Bivalva, Gastropoda>
Neritodryas subsulcata
Neritina pulligera
Neritina turrita
Neritina plumbea
Sermyla riqueti
Clithon chlorostoma
Neritina variegata
Stenomelania juncea

* 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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