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Estimation of Aquatic Animals' Potential Habitats based on Geographical Information System.

基于地理信息系统的水生动物潜在栖息地估算。

基本信息

批准号：
15510008
负责人：
TANAKA Tetsuo
金额：
$ 2.43万
依托单位：
University of Hyogo (2004)Himeji Institute of Technology (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

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 … More 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

在分析兵库县水生和湿地动物的潜在栖息地之前，我们收集了大量的评估报告，当地论文和科学出版物。淡水动物的数据库样本高达一万五千个。然后，在地理信息系统（GIS ; ESRI软件）中给定比例尺网格的基础上，对这些水生动物的分布与现有的地质、地理、气象和植物社会学数据库进行了多元回归分析。分析表明，排水面积、给定点的坡度和下游垂线面积决定了河沟水置换频率的时间。河涌水体置换量的低值与泥沙等悬浮物的沉降速率有关。这一存款层为淡水双壳类提供了适宜的栖息地，进而为濒危的鲤类提供了适宜的产卵物质 ...更多信息像小鱼一样的小鱼。在兵库县，被泥沙嵌入的溪流现在是相当稀缺的栖息地。这些栖息地已经被大嘴鲈鱼和蓝鳃鱼等外来鱼类入侵。濒临灭绝的淡水鱼是双重打击的情况。现在迫切需要都道府县政府采取措施减少这些外来物种的数量。在这种情况下，由于水田建设所造成的缓坡的缺乏，位于山坡上，提供了地下水的渗漏点，它使临时池作为这种水生动物的产卵点。两个变量的时间池和渐变的坡度与植被强烈相关，这蝾螈的潜在栖息地。此外，我们还调查了以鲤科鱼类为主的淤泥质和桑迪河段河道整治前后鱼类群落的变化。整治前河流结构特点是岸线复杂，存在深点，下卧淤泥质底质。改良后的土壤性状为平坦、浅化、桑迪基质。鱼类群落结构对这种生境因子的剧烈变化作出了严格的反应。我们判断这种变化将是暂时的现象。继续进行生境结构和鱼类群落的监测研究。少