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Coastal Area 16802 Northwestern Sadogashima Island

Basic Information A separate window opensReferences

Relevant municipalities Sado, Niigata Prefecture
Area (km2) 380

Reason(s) for selection A separate window opensCriteria

Selected due to high levels for the criteria 2 and 5, and selected by MARXAN software.

Characteristics A separate window opensReferences

These waters extend from Mano Bay on Sadogashima Island to the vicinity of Cape Konose on the east coast, including the western and northern parts of Sadogashima Island and Ryotsu Bay. The shallow waters of Mano Bay are home to seagrass and seaweed beds. Seaweed beds unfold from near Futami Port on the west side of Mano Bay, and communities of Sargassum araii extend off the coasts of Futami, Inakujira, and Nanaura (Sargassum araii is distributed only at Sadogashima Island, Awashima Island, and Tobishima Island) (Ministry of the Environment, 2001). In the vicinity of Tassha in the west side are confirmed habitats of rare species including numerous relatives of the flat-headed goby, and osprey and blue rock thrush live here too (Awata, personal communication). The Sotoakaifu coastal zone is the site of a series of reef shores and pebble beaches in highly natural states. Here are expansive seaweed beds thick with diverse types of seaweed, with the largest seaweed bed area among the islands that dot the Sea of Japan (approx. 7000 ha) (Ministry of the Environment, 2001). These waters are home to large numbers of species and populations of both fish and benthic organisms, and diverse flat-headed goby live at the pebble beaches. In the river-mouth area on the west coast some distinctive species of Sadogashima Island can be seen, including sea-run Japanese char, cherry salmon, Rhinogobius brunneus, Cottus hangiongensis and others Sado city, 2012). In the famous diving spots such as Akaiwa and Nagate at Kitakoura live diverse species of fish, including bulgyhead wrass. These are waters with a high degree of biodiversity, where most of the fish of the coast of Sadogashima Island can be seen (Awata, personal communication). The sea grass and seaweed beds in Ryotsu Bay are connected to the seaweed beds on the east side (Sakurai, personal communication).

Environment / Habitat infromation A separate window opensData source

Tidal mud flats (km2)
Moba (seaweed bed) (km2) 60.7
Coral reef coverage (km2)
Natural coast (km) 94
Rate of natural coast (%) 46.5
Sand bank / submerged sand bank
Other habitats

Species information (*) A separate window opensData source

Criteria 1
Lycodes japonicus
Cottus kazika (Fourspine sculpin)
Criteria 2
Apus pacificus (Pacific Swift)[Br/Ne]
Monticola solitarius (Blue Rock-thrush)[Br/Ne]
Phalacrocorax capillatus (Japanese Cormorant)
Phalacrocorax capillatus (Japanese Cormorant)[Br/Ne]
Larus crassirostris (Black-tailed Gull)
Larus crassirostris (Black-tailed Gull)[Br/Ne]
Egretta sacra (Pacific Reef-egret)[Br/Ne]
Charadrius dubius (Little Ringed Plover)[Br/Ne]
Charadrius alexandrinus (Kentish Plover)[Br/Ne]
Falco peregrinus (Peregrine Falcon)[Br/Ne]
Pandion haliaetus (Osprey)[Br/Ne]
Paralichthys olivaceus (Bastard halibut)[Sp]
Pagrus major (Red seabream)[Sp]
Loligo bleekeri (Spear squid)
Criteria 3
Cottus kazika (Fourspine sculpin)
Leucopsarion petersii (Ice goby )
Gastersosteus aculeatus aculeatus (Three-spined stickleback)
Cicindela sumatrensis niponensis
Criteria 7
Luciogobius pallidus
Luciogobius guttatus (Flat-headed goby)
Gastersosteus aculeatus aculeatus (Three-spined stickleback)
<Bivalva, Gastropoda>
Blanfordia japonica

* 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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