隨著生態意識提升溪流生態受到重視，在學術研究與工程實作上魚類資料的蒐集和使用扮演很重要的角色，但是在台灣往往有生物資料稀少不完整以及現場調查不容易的現實困難，所以本研究為了解決上述問題，將探討棲息地河段地文因子與魚類豐度之關係，利用地理資訊系統(GIS)得到不同環域半徑下的地文因子與魚類豐度進行複回歸分析，藉此建立地文因子與魚類豐度之關係，進而提供研究者及管理者選擇適當範圍的地文因子推估目標河段區域採樣點位間的魚類豐度變化。
研究架構以台灣南部楠梓仙溪流域為研究區域，蒐集整理魚類資料並且計算魚類平均密度，首先應用離式統計量以及考慮逐年平均密度的變化程度，進行初步不同魚種棲息地狀況比較分析，之後再進一步地利用群集分析將平均密度分群，給予棲息地等級評估，另外結合變異係數分析說明族群穩定度。接著利用圖層資料操作GIS獲得地文因子，地文因子分為穩定以及不穩定地文因子，將穩定地文因子與魚類密度進行複回歸分析(年度比較和乾濕季比較)。年度比較分析先拿各年度平均密度與地文因子作分析，第二部分將魚類密度分乾濕季討論，分別與地文因子進行分析，找出地文因子與各魚種的相關性；不穩定地文因子則與平均密度群集分析結果比較找出關係。
離勢統計量分析、群集分析和變異係數分析的結果說明：各魚種在不同採樣點有不同棲息地偏好，採樣點以及魚種有分開進行討論之必要性，所以決定將魚種分為台灣馬口魚、台灣石魚賓、高身鯝魚和鯝魚進行後續分析討論。在複回歸分析中，初步分析結果僅有台灣石魚賓在93年環域半徑300公尺條件下統計模式結果有達到顯著水準；乾濕季比較分析結果，則有台灣馬口魚、台灣石魚賓和鯝魚統計模式結果有達到顯著水準，分別為92年濕季台灣馬口魚；91和92年濕季台灣石魚賓；91和93年乾季鯝魚；91和92年濕季鯝魚，而且模式判定係數 值皆大於0.7，說明利用穩定地文因子對魚類豐度的解釋能力很好，最後透過各穩定地文因子係數以及顯著性，找出影響魚類豐度的地文因子，台灣石魚賓魚類豐度在環域範圍300公尺條件下發現與蜿蜒度有顯著關係，在環域範圍500公尺以上的模式結果發現，與平均高程有顯著關係，鯝魚魚類豐度魚類豐度在環域範圍1000和1500公尺條件下與平均高程有顯著關係；不穩定地文因子與群集分析結果比較發現無法說明與魚類豐度的關係，但可以用在採樣點魚類豐度高低的佐證。

This study attempted to examine the relationships between landscape features and fish abundance in a mountain stream of Taiwan. The study area is along the middle part of Cishan Stream catchment, Kaohsiung County, because of the available data for fish abundance and landscape features. Four fish species with higher abundance for study were Candidia barbata, Acrossocheilus paradoxus, Onychostoma alticorpus and Onychostoma barbatula. Landscape features, what are acquired from remote sensing data by using GIS, were analyzed as two groups, stable and unstable, in different spatial scales. Stable landscape features, what change chronically and slowly in a long period of time, included stream length, stream sinuosity, stream density, average altitude, average slope, and catchment width and shape. While unstable landscape features, what may relate to acutely and fast geomorphological changes, included average slope, altitude variation, soil erosion, and catchment shape.
Multiple regression results showed that year-round density of the A. paradoxus was significantly related to some stable landscape features within 300 meter radius of fish sampling sites. Fish density increased with increasing sampling stream length, decreasing average height, increasing average slope, and decreasing sinuosity. While examined the density in wet and dry seasons, this study found that wet season density of A. paradoxus, O. barbatula, and C. barbata were significantly related to some stable landscape features. For unstable landscape features, although regression failed to show significant relationships between fish density and landscape features, categorical analysis among sampling sites provided some ranking of habitat quality.

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