MOE home > Nature and Parks > EBSA home > Coastal Area > 14105 Southern part of the Suo-nada Sea
Relevant municipalities | Usa, Nakatsu, Bungotakada, Oita Prefecture; Karita, Yoshitomi, Chikujo, Yukuhashi, Buzen, Fukuoka Prefecture |
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Area (km2) | 437 |
Selected due to high levels for the criteria 1, 3, 5 and 7, and selected by MARXAN software.
These are the waters from the tidal mud flats at the mouths of the Imagawa and Nagasa Rivers to the west through the Katsura River to Hanehame in the east. These waters have been confirmed to be habitat for Japanese eel, small-scale whiting (Oita Prefecture, 2011), Japanese horseshoe crab and others, and it is highly likely that they are used as spawning grounds for Japanese horseshoe crab. Fiddler crab live in the tidal mud flats of the area from Nagaihama to the fishing port of Nishikakuda, as do Mesochaetopterus japonicus together with their Polyonyx sinensis, along with razor clam and Chinese mactra (Ministry of the Environment, 2001). Similarly, in the tidal mud flats from the area of the mouth of the Yamakuni River to the mouth of the Katsura River the endangered species mudskipper and Taenioides crirratus and other rare species of small gobies and shellfish have been confirmed to live (Ito, 2006; Oita Prefecture, 2011; Nakatsu Waterfront Conservation Association, 2003; 2010; 2013). Bird species seen here include black-bellied plover, ruddy turnstone, dunlin, grey-tailed tattler, Numenius phaeopus and others, with relatively high numbers of species and populations visiting the Nakatsu tidal mud flats, the Usa coast, and other areas during the spring and fall migrations and wintering there (Ministry of the Environment, 2001; Nakatsu Tidal Mud Flats Snipe and Plover Research Group, 2003). This area also has been named a Marine IBA since in the average year 50-80 Saunders’ gulls either visit or winter here (BirdLife International, 2012). This also is one of the places in Japan most visited by falcated duck, approximately 2000 of which visited in 2012. It also is home to numerous endangered species of shellfish, with an abundance of bay shellfish (Neripteron cornucopia, Cerithidea largillierti, Cerithidea ornata, Euspira fortunei, Ellobium chinense, pen shell, Mediterranean mussel, Serratina capsoides and others) (Yamashita, 2003; Ministry of the Environment, 2001). Numerous Triglochin maritimum, Zostera japonica, Limonium tetragonum, Artemisia fukudo and other plants have been confirmed here as well.
Tidal mud flats (km2) | 55 |
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Moba (seaweed bed) (km2) | 25.4 |
Coral reef coverage (km2) | |
Natural coast (km) | 10.2 |
Rate of natural coast (%) | 7.4 |
Sand bank / submerged sand bank | |
Other habitats |
Criteria 1 |
<Crustacea> |
Cleistostoma dilatatum |
Uca arcuata |
<Bivalva, Gastropoda> |
Cyclina sinensis |
Angustassiminea castanea |
Cerithidea largillierti |
Cerithidea ornata |
Platevindex sp. |
Meretrix lusoria |
Solen strictus |
Assiminea parasitologica |
Corbicula japonica |
<Vascular Plants> |
Suaeda japonica |
Criteria 2 |
<Mamal> |
Neophocaena phocaenoides (Fineless porpoise) |
<Aves> |
Sterna albifrons (Little Tern) |
Sterna albifrons (Little Tern)[Br/Ne] |
Charadrius dubius (Little Ringed Plover)[Br/Ne] |
<Pisces> |
Ammodytes personatus (Japanese sand lance)[Sp] |
Engraulis japonicus (Japanese anchovy)[Sp] |
Takifugu rubripes (Japanese pufferfish)[Sp] |
Pleuronectes yokohamae (Marbled flounder)[Sp] |
<Crustacea> |
Tachypleus tridentatus (Horseshoe club) |
Criteria 3 |
<Aves> |
Sterna albifrons (Little Tern) |
<Pisces> |
Anguilla japonica (Japanese eel) |
<Crustacea> |
Chiromantes haematocheir |
Cleistostoma dilatatum |
Deiratonotus cristatus |
Clistocoeloma sinense |
Parasesarma plicatum |
Uca arcuata |
Ilyoplax pusilla |
Uca lactea |
Sesarmops intermedium |
Polyonyx sinensis |
Macrophthalmus japonicus |
<Bivalva, Gastropoda> |
Serratina diaphana |
Ellobium chinense |
Cyclina sinensis |
Cerithideopsilla djadjariensis |
Melampus sincaporensis |
Laemodonta siamensis |
Cerithidea largillierti |
Laternula impura |
Laguncula pulchella |
Cerithidea ornata |
Platevindex sp. |
Littorina brevicula |
Auriculastra duplicata |
Glauconome angulata |
Meretrix lusoria |
Fairbankia sakaguchii |
<Other invertebrate> |
Nectoneanthes uchiwa |
Chaetopterus cautus |
Travisia japonica |
Mesochaetopterus japonicus |
<Vascular Plants> |
Suaeda japonica |
Suaeda malacosperma |
Criteria 7 |
<Pisces> |
Luciogobius guttatus (Flat-headed goby) |
<Crustacea> |
Macrophthalmus abbreviatus |
Tachypleus tridentatus (Horseshoe club) |
Uca arcuata |
Ocypode stimpsoni |
Uca lactea |
Macrophthalmus japonicus |
Moerella rutila |
<Bivalva, Gastropoda> |
Serratina diaphana |
Umbonium moniliferum |
Cerithidea largillierti |
Cerithidea ornata |
Meretrix lusoria |
Neripteron sp. |
Cerithidea rhizophorarum |
Cerithideopsilla cingulata |
Corbicula japonica |
<Vascular Plants> |
Aster tripolium (Sea aster) |
Suaeda japonica |
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