| 释义 |
ˌunder-diˈspersion
[under-1 10 b.]
A reduced degree or amount of dispersion; spec. in Ecol., a greater evenness in the distribution of individuals than would be expected on purely statistical grounds. Cf. over-dispersion. Also ˌunder-diˈspersed ppl. a.
1935Ann. Bot. XLIX. 794 There is significant under⁓dispersion or aggregation among the individuals of the population. 1940Proc. Linnean Soc. N.S.W. LXV. 135 The distribution of individual species in the areas examined must be either random, or over- or under-dispersed. 1946,1957[see over-dispersion]. 1962D. R. Cox Renewal Theory iii. 42 Expression..is less than one, so that there is apparent under-dispersion relative to the Poisson distribution. 1964K. A. Kershaw Quantitative & Dynamic Ecol. vi. 98 Several species showed either ‘overdispersion’ or ‘underdispersion’. 1982G. A. F. Seber Estimation of Animal Abundance (ed. 2) xii. 479 The classification into overdispersed and underdispersed is not sufficiently fine. |