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Coastal Area 13501 Adjacent waters of Ako, Chikusa River mouth

Basic Information A separate window opensReferences

Relevant municipalities Bizen, Okayama Prefecture; Tatsuno, Ako, Aioi, Himeji, Hyogo Prefecture
Area (km2) 150

Reason(s) for selection A separate window opensCriteria

Selected due to high levels for the criteria 1, 2, 3 and 7, and selected by MARXAN software.

Characteristics A separate window opensReferences

These waters include the mouth of the Ibi River, the Shinmaiko coast, the mouth of the Chikusa River, Kakui Island, and others. In the Maehama tidal mud flats on the Shinmaiko coast the bivalve razor clam, which has become few in number nationwide, and the crab Pseudopinnixa carinata are prolific. At the mouth of the Chikusa River unfold river-mouth tidal mud flats and saltwater marshlands, normally populated with razor clams, a rare parasitic bivalve called Peregrinamor ohshimai, Uca lactea lactea, Clistocoeloma sinensis, and Patinapta ooplax (Ministry of the Environment, 2001). Also living here are Assiminea yoshidayukioi, which is highly likely to be a species unique to Japan, and others (Japanese Association of Benthology, 2012).

Environment / Habitat infromation A separate window opensData source

Tidal mud flats (km2) 1.7
Moba (seaweed bed) (km2) 1.3
Coral reef coverage (km2)
Natural coast (km) 115.1
Rate of natural coast (%) 58.9
Sand bank / submerged sand bank
Other habitats

Species information (*) A separate window opensData source

Criteria 1
Gymnogobius uchidai
<Bivalva, Gastropoda>
Stenothyra edogawensis
Cyclina sinensis
Angustassiminea castanea
Assiminea estuarina
Meretrix lusoria
Assiminea parasitologica
Corbicula japonica
Angustassiminea yoshidayukioi
Criteria 2
Neophocaena phocaenoides (Fineless porpoise)
Monticola solitarius (Blue Rock-thrush)[Br/Ne]
Larus crassirostris (Black-tailed Gull)
Larus crassirostris (Black-tailed Gull)[Br/Ne]
Larus schistisagus (Slaty-backed Gull)
Larus schistisagus (Slaty-backed Gull)[Br/Ne]
Larus canus (Mew Gull )
Phalacrocorax carbo (Great Cormorant)[Br/Ne]
Egretta sacra (Pacific Reef-egret)[Br/Ne]
Charadrius dubius (Little Ringed Plover)[Br/Ne]
Larus argentatus (European Herring Gull)
Falco peregrinus (Peregrine Falcon)[Br/Ne]
Pandion haliaetus (Osprey)[Br/Ne]
Larus ridibundus (Black-headed Gull)
Ammodytes personatus (Japanese sand lance)[Sp]
Paralichthys olivaceus (Bastard halibut)[Sp]
Pleuronectes yokohamae (Marbled flounder)[Sp]
Amphioctopus fangsiao (Ocellated octopus)
Octopus vulgaris (Common octopus)
Criteria 3
Podiceps cristatus (Great Crested Grebe)
Sterna albifrons (Little Tern)
Gymnogobius macrognathos
Gymnogobius cylindricus
Gymnogobius scrobiculatus
Apocryptodon punctatus
Gymnogobius uchidai
Chiromantes haematocheir
Helice (Helice) tridens
Parasesarma plicatum
Ilyoplax pusilla
Uca lactea
Macrophthalmus japonicus
<Bivalva, Gastropoda>
Batillaria zonalis
Cyclina sinensis
Littorina brevicula
Meretrix lusoria
<Other invertebrate>
Mesochaetopterus japonicus
<Vascular Plants>
Suaeda malacosperma
Criteria 7
Luciogobius pallidus
Macrophthalmus abbreviatus
Uca lactea
Macrophthalmus japonicus
<Bivalva, Gastropoda>
Batillaria zonalis
Meretrix lusoria
Neripteron sp. 
Cerithidea rhizophorarum
Cerithideopsilla cingulata
Truncatella pfeifferi
Corbicula japonica
<Vascular Plants>
Aster tripolium (Sea aster)
Triglochin asiaticum
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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