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題 名 | 應用棲地空間自相關性推測稀有蘭科植物的潛在分布=Using Spatially Autocorrelated Environmental Conditions in Habitats to Project Potential Distributions of Rare Orchids |
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作 者 | 徐嘉君; 徐嘉君; | 書刊名 | 臺灣林業科學 |
卷 期 | 30:2 2015.06[民104.06] |
頁 次 | 頁97-107 |
分類號 | 377.2102 |
關鍵詞 | 物種分布模式; 空間自相關性; 蘭科植物; 稀有性; 特有種; Endemic species; Orchid; Rarity; Spatial autocorrelation; Species distribution model; SDM; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究針對棲地環境有特殊需求的稀有物種,提出新的空間分析方法來預估其可能的分布區域及影響其分布的環境條件,以空間分析軟體演算20個獨立環境圖層的空間自相關性,並採用8種在台灣記錄位點低於5點的稀有蘭科植物,將物種分布點與空間自相關顯著區域相疊合,以推測其可能的分布範圍,並探討其分布狹隘成因。模式顯示某些蘭科物種侷限於空間自相關性較高的區域,推測其侷限分布可能是因為對棲地有特殊需求,而那些分布在空間自相關性不高區域的物種,其稀有成因很可能是因為人為開發,導致棲地破碎而侷限其族群數量。研究結果也顯示,採用空間自相關性模式的分析,有助於解釋在台灣島上的某些區域,特有種比例較高的現象;針對棲地需求特殊的物種,本研究預測的可能分布範圍頗具參考價值,且能指出物種生存所需的關鍵性棲地條件。有趣的是,研究結果顯示區域環境隔離程度,與物種豐富度,呈現負相關的趨勢,值得進一步加以研究。 |
英文摘要 | A novel approach of calculating the spatial autocorrelations of 20 independent environmental factors was applied to project potential distributions of 8 rare orchid species (with fewer than 5 occurrences). The occurrences of these orchids were overlaid on environmental layers with significant spatial autocorrelations to identify possible areas of distribution and relevant environmental factors. Results showed that some species' distributions located in regions with high spatial autocorrelations, suggesting unique habitat requirements. In contrast, several species' occurrences scattered over areas with low spatial autocorrelations, and their rarity was possibly due to anthropogenic disturbance, fragmentation, or geological history. The spatial analysis developed here indeed provided applicable information for rare species distributions which is difficult to project using typical species distribution models. The results also showed that spatially autocorrelated habitat conditions seemed to be positively related to endemicity but negatively related to species richness. |
本系統中英文摘要資訊取自各篇刊載內容。