|
|
|
|
|
|
|
|
|
|
|
|
|
 資料室
|
|
|
|
|
|
|
|
|
|
|
資料室メニュー一覧
資料室の一覧のページへ戻る
On the Distribution Uca arcuata and Uca lactea in the Yoshino
River Estuary and Vicinity (Tokushima Prefecture)
Rieko Iguchi, Masako Tajima, Keiji Wada
Abstract The crab species Uca arcuata and Uca lactea are listed
as "Rare" in the "Endangered Species of Japan(Red Data Book)" published
by the Environment Agency of Japan (1991). In the Yoshino River Estuary
and vicinity, concentrated populations of both species remain; moreover,
both are distributed over a wide area.
Surveys to determine the density
of active individuals were performed in the brackish water region of the
Yoshino River estuary from the rivermouth up to the Daiju-seki fixed
rock barrier 14.5 kilometers upstream, and habitation of Uca arcuata
was confirmed up to the 10.5 km point. Also, within Tokushima
prefecture, the presence of both species was confirmed at the Katsu-ura
River and the Naka River, and Uca arcuata at the Sonose River.
It was
interesting that the results showed spatial distribution patterns for
populations of both species in estuaries containing tidal mudflats.
Back
|
〒770-0944
市民調査