2004 Fiscal Year Final Research Report Summary
Estimation of Aquatic Animals' Potential Habitats based on Geographical Information System.
| Project/Area Number |
15510008
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | University of Hyogo (2004)
Himeji Institute of Technology (2003) |
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Principal Investigator |
TANAKA Tetsuo University of Hyogo, Institute of Natural and Environmental Sciences, Associate Professor., 自然・環境科学研究所, 助教授 (40244694)
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| Co-Investigator(Kenkyū-buntansha) |
KADONO Yasuo Kobe University, Institute of Gene-Bank, Professor., 遺伝子実験センター, 教授 (90127358)
SAKATA Hiroshi University of Hyogo, Institute of Natural and Environmental Sciences, Associate Professor., 自然・環境科学研究所, 助教授 (40301808)
MITSUHASHI Hiromune Hyogo, Museum of Nature and Human Activities, Researcher., 研究員 (50311486)
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| Project Period (FY) |
2003 – 2004
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| Keywords | Geographical Information System / Potential Habitat / Aquatic Animals / River Improvement / Sedimentary Reach / Freshwater Bivalves / Cyprinid Fishes |
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| Research Abstract |
Prior to analyzing the potential habitat of aquatic and wetland animals in Hyogo Prefecture, we gathering a numerous number of assessment reports, local papers and scientific publications. The data base sample of the fresh water animals reach up to fifteen thousands. Then, we analyzed the multiple-regression between these aquatic animals distribution and the existing geological, geographical, meteorological and plant sociological database on the base of given scale grid in Geographical Information System (GIS ; ESRI soft). These analysis revealed that the area of the drainage, the gradient of given point and the area of vertical section following downstream, decides time of creek water replacement frequency. The low value of creek water replacement surely related to sedimentation rate of suspended substances such as mud and sand. This deposit layer provides the suitable habitat for freshwater bivalves, and then these bivalves provide the suitable spawning substances of endangered cypri
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nid fish such as small bitterling. In Hyogo Prefecture, the stream reach embedded by mud and sand is now quite scarce habitats. These habitats are already invaded by alien fish of largemouth bass and blue gill. The endangered freshwater fish is double punched situation. Actions depressing these alien species population by the prefectural government is urgently needed now.
The same method is employed about Japanese countryside salamander, Kasumi. In this case, the lack of the gradual slope created by paddy field construction located mountain slope, provides the leak point of ground water, it making temporal pool for spawning point for this aquatic animal. The set of two variables of temporal pool and gradual slope with vegetation strongly correlated to potential habitat of this salamander. In this case, the distance from nearest another suitable habitat is also important factor.
In addition, we investigated the fish communities differences between prior to and after stream channel improvement at muddy and sandy reach, where inhabited by endangered cyprinid fishes. Before improvement stream structure were characterized by, complicated shore-line, existence of deep point, and embedded by muddy substrate. After improvement these characters changed to plain shape, shallow area and sandy substrate. According to this dramatic change of the habitat factors, fish community structure strictly responses immediately. We judge this change will be temporal phenomenon. The monitoring research both habitats structure and fish communities are continued. Less
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Research Products
(6 results)
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[Journal Article] The change of freshwater fish community structure, prior to and after river Improvement.2003
Author(s)
Tetsuo, TANKA, Tutomu, NOBUMOTO, Hiromune, MITUHASHI
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Journal Title
Natural Environments and Human Activities, and their Interrelationship in the Mukogawa River Basin, Hyogo, Japan, Sanda
Pages: 40-43
Description
「研究成果報告書概要(欧文)」より
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