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頁籤選單縮合
題 名 | A New Method to Establish Scoring Criteria of the Index of Biotic Integrity=一種建立生物整合指標評分標準之新方法 |
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作 者 | 梁世雄; | 書刊名 | 動物研究學刊 |
卷 期 | 36:3 1997.07[民86.07] |
頁 次 | 頁240-250 |
分類號 | 388.5 |
關鍵詞 | 生物指標; 生物整合指標; 環境評估; 溪流魚類; 群聚生態; Biological indicator; Index of biotic integrity; Environmental assessment; Stream fishes; Community ecology; |
語 文 | 英文(English) |
中文摘要 | 生物整合指標(Index of Biotic Integrity, IBI)是綜合魚種歧異度、食性群與健康等12 個魚類群聚特徵,以評估溪流環境之生物評估系統。本研究之目的在改進計算IBI給分標準 之程序,並以改良之IBI使用於愛荷華州中北部流域,以測試其評估溪流環境品質之功能。 我們在Boone River選擇21個採集點,於1988和1989年七月,以電魚法採集魚類樣本, 作為建立IBI計分標準的基本資料。另於受到城市廢水和農業影響的Lizard Creek流域選擇 8個採樣點,於1988和1989年六月、八月和十月以電魚法進行魚類採集,以探討IBI之環 境評估功能。 IBI的計分標準,由原來以目測法決定Maxumum-Species-Richness Line (MSRL)再三分 其下限區域之方法,改為如果群聚變數與流域面積間有統計上顯著的直線關係存在時,則 MSRL由Y軸截距的95%上限和原有斜率決定,再三分其下區域,以建立高於平均值(5 分)、類似於平均值(3分),與低於平均值(1分)的區域以為IBI的計分標準,若無直線 迴歸關係存在,則先移除上下5%的採集點建立界線,再將剩餘區域均衡三分。 根據我們的改良計分法,一組資料間將只會產生一條MSRL,這可解決目測法因研究 人員目視差異而有同組資料產生多條MSRL之缺點,這個新的計分法也可能促進IBI評估 溪流環境之能力,因為與環境因子之測量結果比對,利用改良方法計算的IBI(1)可分辨Lizard Creek中採集點間的環境品質差異,(2)對枯水期造成的溪流環境變化可迅速反應,(3)同 時季節變動時,分辨空間環境差異的敏感度仍維持穩定,且優於Shannon-Weiner Diversity index。在本研究中,IBI分數之變化主要受到和魚種歧異度有關的群聚變數影響。 |
英文摘要 | Shih-Hsiung Liang and Bruce W. Menzel (1997) A new method to establish scoring criteria of the Index of Biotic Integrity. Zoological Studies 36(3): 240-250. Karr's Index of Biotic Integrity (IBI) was applied in north central lowa streams to examine the technique's utility for measuring environment quality in agriculturally influenced streams and to develop methodological improvement. During 1988 and 1989, fish were collected in the Boone River and Lizard Creek systems, and physical and chemical measurements of stream environmental conditions were taken. A modified two-step procedure was proposed for establishing the scoring standard of the 12 IBI metrics. First, a simple linear regression relationship of the metric variable on log drainage area was calculated (p=1). If a significant correlation was found, a Maximum-Species-Richness Line (MSRL) was determined by calculating the 95% Y-intercept as its intercept, and then plotted by the original regression slope. If a nonsignificant relationship was obtained, the upper and lower 5% data points were deleted to define the upper and lower boundaries of the remaining points with horizontal lines. Finally, the area below the calculated 95% MSRL and the area between the two horizontal lines were equally trisected into above average (5 points), average (3 points), and below average (1 point) categories. After the scoring criteria were established, the IBI value of each sampling site in Boone River and Lizard Creek systems was calculated. The new scoring procedure resolved the problem of the commonly adopted "eye-fit" method through generating only a single MSRL for a given data set. In Lizard Creek, IBI results were generally consistent with evaluations of physical and chemical environmental quality. During the drought period, variations of IBI scores reflected the dynamics of environment conditions in the sampling sited. Additionally, the IBI showed greater temporal consistency than another commonly used analytical tool, the Shannon-Weiner Diversity Index. Thus, the new scoring procedure seems to advance the effectiveness of IBI in assessing the environment quality of lotic waters. Numerical species metrics associated with species diversity were more important than proportional ones in contributing to the IBI. Drought conditions throughout the study period influenced some of the data and analytical results. |
本系統中英文摘要資訊取自各篇刊載內容。