City:C/Town:T/
Village:V
|
Wetland type
|
Biota
|
Habitat
|
Reason for selection |
Ibaraki T,
Oarai T,
Asahi V |
Wetland
complex,
Lagoons |
Wetland
vegetation |
Hi-numa |
Phragmites communis, Typha latifolia, Zizania latifolia, Scirpus tabernaemontani, S. triqueter, Trapa japonica, Hydrilla verticillata, Ceratophyllum demersum, Vallisneria asiatica, and communities of Bostrychia tenella-Caloglossa continua.
|
Geese and
ducks |
Kasumiga-ura,
Hi-numa and
neighboring lakes
and marshes
(Kita-ura and
Sugao-numa) |
These lakes and marshes, including Kasumiga-ura Lake, are the primary wintering sites of ducks and geese in Kanto region. In particular, paddy fields and meander scars that adjoin the Lake, as well as the Lake itself, constitute the only regular wintering sites for geese (Anser fabalis middendorffii) in Kanto region. Hi-numa, Kita-ura and Sugao-numa (marshes) also preserve a suitable environment for geese inhabitation, and the geese stop here irregularly. At Sugao-numa, around 100 Anser albifrons were counted in January 2000 during the wintering season.
[Kasumiga-ura]: Anser fabalis middendorffii, Anas platyrhynchos and Anas crecca.
[Kita-ura]: Aythya valisineria.
[Hi-numa]: Bucephala albeola, rare species, is sometimes observed.
[Sugao-numa]: Cygnus columbianus. |
Freshwater
fish |
Hi-numa |
Southernmost habitat of landlocked Clupea pallasii. Their population has dramatically declined. |
| Insects |
Hi-numa |
Hi-numa is the type locality of Mortonagrion hirosei. (In Japan, this dragonfly species inhabits only in brackish areas where Phragmites australis, Zizania latifolia and Juncus effusus grow and where freshwater meets the salty water. If the dragonfly wanders away from such habitat, it becomes the prey of the larger dragonflies.) |
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