從墾丁國家公園臺灣梅花鹿(Cervusnippontaiouanus)排遺堆數及分解速率估算其族群數量

外文標題: 
Estimating Formosan Sika Deer (Cervus nippon taiouanus) abundance by dung pellet group counts and dung decay rates in Kenting National Park
校院系所: 
國立臺北教育大學自然科學教育學系碩士班
指導教授: 
陳順其
出版年份: 
2009年
主題類別: 
摘要: 

本研究主要探討臺灣梅花鹿之排遺分解速率,再以排遺計數法及排遺移除計數法估算復育區臺灣梅花鹿的族群數量。自2009年5月至2010年4月,在復育區進行排遺分解速率調查,復育一及四區各1條穿越線上蒐集並標定臺灣梅花鹿新鮮排遺共223堆,結果平均分解天數為85天(n=223),在濕季時的平均分解天數為45天(n=56),乾季時的平均分解天數為98天(n=167)。以上結果用排遺計數法估算復育一區臺灣梅花鹿族群數量為11隻,復育四區臺灣梅花鹿族群數量為8隻。自2009年4月至2010年3月間,另以排遺移除計數法紀錄每月的排遺堆數,復育一區排遺濕季每月平均96堆/公頃,乾季每月平均254堆/公頃。復育四區排遺濕季每月平均38.7堆/ha,乾季每月平均173.3堆/公頃,顯示乾濕季排遺分解的速率不同,其影響原因為雨量。在乾季時以排遺移除計數法估算復育一區臺灣梅花鹿族群數量平均為17隻,復育四區臺灣梅花鹿族群數量平均為9隻。以自動照相機作為輔助估算鹿群數量其結果復育一區臺灣梅花鹿族群數量為20-30隻,復育四區臺灣梅花鹿族群數量為15-24隻。排遺計數法及排遺移除法所估算族群數量比自動照相機估算族群數量低,推測原因可能因乾季為發情季節,雄鹿有領域行為,降低鹿的均勻分布及排遺計數時可能遺漏排遺堆數的記錄而低估族群數量。

外文摘要: 

This research mainly focuses the speed of fecal pellet decomposition of Formosan Sika deer. In my research, the population sizes of the deer in restoration areas were estimated with dropping counts and clearance method. According to my investigation into the speed of fecal pellet decomposition in specific restoration area, I found 223 fresh excrements on two transection lines in restoration 1 and another line in restoration 4. The fecal pellet decomposition period in wet season was 45 days (n=56), and that in dry season was 98 days (n=167). The average was 85 days (n=223). Hence there were 11sika deer in restoration area one and 8 in restoration area four by my estimate of using dropping counts. Besides, from April 2009 to March 2010, there were about 96 piles of fecal pellet per hectare every month in wet seasons and 254 in dry seasons in restoration area one when clearance method was used to keep track of excrements every month. However, there were 38.7 piles/ha per month in wet seasons and 173.3 piles/ha in dry seasons. It is clear that the speeds of fecal pellet decomposition were different in wet and dry seasons. Therefore, I attributed the difference of speeds to the rainfall. I estimated that there were about 17 sika deer in restoration area one and 9 in restoration area four in dry seasons by using clearance method.
However, there were 20-30 deer in restoration area one and 15-24 in restoration 4 when automatic cameras were used as an auxiliary tool for estimates. The population sizes from dropping counts and clearance method were smaller than those from the use of automatic cameras. This result may be attributed to deer’s oestrus in dry seasons because the bucks sika deer’s territorial behavior may lower their uniform distribution. In addition, the population size may be underestimated since I might have missed some fecal pellets when I used dropping counts method.