【摘要】 <正> Many studies on models of growth of body weight in animals have been reported. This paper provides a model of growth of body weight in plateau pika (Ochotona curzoniae) under natural conditions. The data of growth of body weight in plateau pikas were obtained from the Haibei Alpine Meadow Ecosystem Reseach Station, Academia Sinica, from May to September in 1979 and from April to October in 1980 and 1981 (Tab. 1 and Tab. 2).The growth of body weight is divided into two stages:the young (0-29 days of life) and the juvenile (29-80 days of life). Body weight remains stable in the adult stage (after 80th day of life). The growth of body weight is quick in 0-29 days and slow in 29-80 days. A model of growth is constructed with the boundary problem of the Logistic equation (1)(1)wherew = body weight (g.)t= age in dayk= saturation boby weightr1 = instrinsic growth rateWi = mean born body weightws = mean observed value of body weight at 29th day of lifefor 0-29 days. The parameter r1 is only estimated according更多还原

【Abstract】 Many studies on models of growth of body weight in animals have been reported. This paper provides a model of growth of body weight in plateau pika (Ochotona curzoniae) under natural conditions. The data of growth of body weight in plateau pikas were obtained from the Haibei Alpine Meadow Ecosystem Reseach Station, Academia Sinica, from May to September in 1979 and from April to October in 1980 and 1981 (Tab. 1 and Tab. 2).The growth of body weight is divided into two stages:the young (0-29 days of life) and the juvenile (29-80 days of life). Body weight remains stable in the adult stage (after 80th day of life). The growth of body weight is quick in 0-29 days and slow in 29-80 days. A model of growth is constructed with the boundary problem of the Logistic equation (1)(1)wherew = body weight (g.)t= age in dayk= saturation boby weightr1 = instrinsic growth rateWi = mean born body weightws = mean observed value of body weight at 29th day of lifefor 0-29 days. The parameter r1 is only estimated according to observed data, another is determined by the boundary conditions of the boundary problem (1). A model of growth is constructed with the boundary problem of the exponential saturation equation (12) for after 29 days(12)where w = body weightt = age in dayswa= adult body weightr2 = instrinsic growth ratews = mean observed value of body weight at 29th day of lifewd = mean observed value of body weight at 80th day of lifeThe parameter r2 is determined by the boundary conditions of (12) . The curves of growth of body weight are as follows for males for femalesSimulated results conform to the actual data in fig. 1 and fig. 2. and the mathematical models in this paper for growth of body weight of plateau pikas are appropriate.更多还原