2007 Fiscal Year Final Research Report Summary
Methods to create aquatic environment with self sustenance on biotope functions under flooding
| Project/Area Number |
18360251
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Civil and environmental engineering
|
|---|
| Research Institution | The University of Kitakyushu |
|---|
Principal Investigator |
KUSUDA Tetsuya The University of Kitakyushu, Department of Environmental Engineering, Professor (50037967)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHIMATANI Yukihiro Kyushu University, Faculty of Engineering, Professor (40380571)
KUBA Takahiro Kyushu University, Faculty of Engineering, Assoc. Professor (60284527)
OISHI Kyoko Kyushu University, Faculty of Engineering, Assist Professor (20110835)
YAMANISHI Hiroyuki Saga University, Institute of Law Land, Associate Professor (20240062)
KUBOYAMA Hiroki Kyushu University, Faculty of Engineering, Research Assistant (30432868)
|
|---|
| Project Period (FY) |
2006 – 2007
|
| Keywords | The River Kita / Dairatonotus japonicas / estuary / rare species / salt wedge / life cycle / protection of organisms / The River Gokase |
|---|
| Research Abstract |
The purpose of this study is to establish conservation methods of endangered species of crustaceans, especially Dairatonotus japonicas in the River Kita, a part of the River Gokase, Miyazaki Prefecture, Japan.
The results obtained consist of scientifically basic ones and methods to conserve it.
Scientifically basic results are as follows :
1) The life cycle of D. japonicas is investigated. In order to make identifying species of larvae possible, a gene technology was applied. The larvae were not transported to the ocean from the estuary ;
2) Characteristics of D. japonicas on resistance and preference ware investigated and by using its results, the transport of the larvae was numerically simulated. As a result, larvae of D. japonicas are concentrated around the upstream end of the salt wedge ;
3) The larvae of D. japonicas are sort of halophilic, but the adults are, however, not. This characteristics are utilized to reduce washout of the larvae to the ocean ; and
4) D. japonicas shares space with other competitive species, such as Sesarmops intermedium. Overlap of the living space may happen, but severe competition was not found.
Methods to conserve D. japonicas are as follows:
5) Artificial pools are effective to protect adults of D. japonicas; under flooding. Sediment transport, especially sand takes place severe damage to D. japonicas.
|
