dc.description.abstract | To understand the spatial and temporal variation of stray dogs in Yangminshan National Park, surveys have been conducted twice a month during April 2002 to March 2004. In 9 routes and 5 scenic spots, we recorded and assessed the population of stray dogs by photographic identification and mark-recapture method. Dog-catches data from Dep. of Environmental Protection of Taipei City have been traced and compared. 506 stray dogs were identified in two years, and the mean minimum number per month was 131. Population size reached the maximum in summer and the minimum in winter. Seasonal variation of recruitment was mainly affected by the puppy-recruits . Numbers of puppy-recruit was zero in winter, but about the same in other seasons. However, it was the adult recruitment that related to the whole population variation trend, because the survival rate of puppies was low. The longest age is more than 2 years. The survival curves were different from every season. The winter recruits have stable survival rate variation. As to other three seasons, survival rate declines more slowly as time goes by. The major cause of decrease in population was the low temperature in winter. Furthermore, population could be suppressed by short-term and large number of catches, but raise after two months. The abundance of stray dogs in routes and scenic spots are different apparently. Both numbers and density are the highest in Lungfengku, and accounted for the 40% of all scenic spots. Routes near Lungfengku were also discovered that contain the most stray dogs. Large populations appeared to live in places which attract many tourists and feeders. | en |
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