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.: Home > Animal Science Papers and Reports > 2004 > Volume 22 Number 2 > Marta Moliٌska-Glura1, Tomasz Szwaczkowski2, Krzysztof Moliٌski1

Survival and hazard functions in the population of David’s deer (Elaphurus davidianus Milne-Edwards, 1866)

Marta Moliٌska-Glura1, Tomasz Szwaczkowski2, Krzysztof Moliٌski1
1 Department of Mathematical and Statistical Methods, The August Cieszkowski Agricultural University of Poznaٌ, Wo³yٌska 33, 60-637 Poznaٌ, Poland 2 Department of Genetics and Animal Breeding, The August Cieszkowski Agricultural University of Poznaٌ, Wo³yٌska 33, 60-637 Poznaٌ, Poland
Abstract :

Survival and hazard functions supply suitable information concerning changes in the population
dynamics, especially in the case of species that are not subjected to artificial selection. One of such
species is David’s deer (Elaphurus davidianus Milne-Edwards, 1866) that underwent a dramatic
reduction in the population size in the first years of the XX century, but has been subsequently
restored from 18 individuals. Population dynamics changes were studied on 1221 David’s deers kept in zoological gardens in the years 1947-2001. Survival and hazard functions were constructed for all individuals according to sex, and separately for those which died in the first year of life, i.e. 14.5% males and 8% females. The hazard function showed similar values for individuals of both sexes in the year 6, 10, 15, 17 and 18 of life. For all males the medians for mortality (hazard function) appeared similar to those for all females. Similar pattern was shown for yearlings. However, between day 40 and 323 shapes of these functions were quite different. Generally, the life span in females was found longer than in males.

Keywords :
David’s deer / mortality rate / survival rate

Date Deposited : 11 Aug 2011 10:28

Last Modified : 11 Aug 2011 10:28

Official URL: http://www.ighz.edu.pl/

Volume 22, Number 2, - 2004

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