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標題: | 福山試驗林糞金龜對於台灣獼猴(Macaca cyclopis)所傳播種子的影響 Effects of Dung Beetles on Seeds Dispersed by Formosan Macaques (Macaca cyclopis) at Fushan Experimental Forest |
作者: | Ya-Ling Lin 林雅玲 |
出版年 : | 2003 |
學位: | 碩士 |
摘要: | 福山試驗林中,有許多植物種子可藉由台灣獼猴的糞便傳播,猴糞中的種子是否會被其他動物再次傳播,以及種子傳播後的命運如何,對瞭解種子傳播過程相當重要。本研究在2001年5月至2003年3月間先後調查福山試驗林不同棲地中會利用猴糞的糞金龜群聚組成,並以塑膠珠模擬種子追蹤猴糞內種子被掩埋的情況,同時配合不同深度萌芽實驗,以瞭解糞金龜在猴糞內種子二次傳播中所扮演的角色。調查結果記錄到2科16種以猴糞為食的糞金龜,包括了地道式、推糞式、定居式等類型。森林的糞金龜種數、總個體數、及大型糞金龜的數量較溪流樹林及草地兩棲地高。猴糞被處理時間及種子被掩埋比例會受季節及棲地的影響,高溫季糞金龜平均花16.7小時處理完20g的猴糞,但低溫季的處理時間則超過1天;而在低溫季的記錄當中,糞便在森林被處理速度比在草地快。高溫季有73.4%的模擬種子會被糞金龜掩埋,大於低溫季的55.4%;不管是2mm或4mm的模擬種子,森林(2mm: 89.0%, 4mm: 80.8%)比草地(2mm: 52.5%, 4mm: 47.7%)中有較多的模擬種子會被掩埋。此外,種子大小會影響種子被掩埋的比例及深度,小種子易被大量深埋。萌芽實驗顯示當掩埋深度大於5cm時,種子無法順利萌芽,所以糞金龜的處理可能不利於小種子的萌芽。至於糞金龜的傳播是否可以減低種子在地表的選汰壓力,如掠食、真菌感染等,則需更進一步確認,以釐清福山試驗林中糞金龜二次種子傳播的角色。 The role of dung beetles in determining the fate of seeds in the feces of the Formosan macaques (Macaca cyclopis) was studied at Fushan experimental forest from May 2001 to March 2003. Macaques' feces were visited by 16 species of dung beetles belonging to 2 families (Scarabaeidae and Trogidae), including tunnelers, rollers and dwellers. Total numbers of species, individuals and large dung beetles collected at the forest site were higher than those at the grassland site. Time needed to process 20g of macaques' feces and the ratio of seeds in feces buried by dung beetles varied with seasons and habitats. It took an average of 16.7 hrs for dung beetles to finish processing 20g of macaques' feces in warm season, while more than 1 day was need in the cold season. Dung beetles processed the feces faster at the forest site than at the grassland site in cold season. Dung beetles buried more seeds in warm season (73.4%) than in cold season (55.4%). Regardless of the size of mimic seeds, a higher ratio of seeds were buried in the forest (2mm: 89.0%, 4mm beads: 80.8%) than in the grassland (2mm: 52.5%, 4mm: 47.7%). Furthermore, seed size would affect the ratio and depth of seeds being buried. Small seeds were buried more and deeper than large seeds. However, seeds would not germinate when they were buried deeper than 5cm. The results suggested that being processed and buried by dung beetles may be unfavorable for germination of small seeds. However, further studies on how handling by dung beetles may affect other selection pressure against seed survival and germination, e.g. predation by rodents or infection by fungi, are need to reveal the role of dung beetles on secondary seed dispersal. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/75394 |
全文授權: | 未授權 |
顯示於系所單位: | 動物學研究所 |
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