64th ISI World Statistics Congress - Ottawa, Canada

64th ISI World Statistics Congress - Ottawa, Canada

Measuring multispecies aggregation level by a conspecific-encounter index using line transect data


Tsung-Jen Shen


  • Y
    Youhua Chen
  • H
    Hoang Van Chung
  • S
    Shengchao Shi
  • J
    Jianping Jiang
  • R
    Richard Condit
  • S
    Stephen P. Hubbell


64th ISI World Statistics Congress - Ottawa, Canada

Format: CPS Abstract

Session: CPS 41 -Environmental statistics III

Tuesday 18 July 8:30 a.m. - 9:40 a.m. (Canada/Eastern)


It is common knowledge that some specific species in an ecological community present aggregate distributions, but this does not necessarily imply that the community as a whole presents an aggregate distribution. Using the conspecific-encounter index derived from the Markov non-independent sampling model, this talk will introduce a legible definition of community-level distributional aggregation as an interspersed or cluster-like distribution of different species. In practical applications, by utilizing the conspecific-encounter index that accounts for the non-independent sampling of consecutive individuals along line transects, the result reveals that tree assemblages in tropical forest ecosystems can present a strong signal of extensive distributional interspersion. By contrast, for the amphibian assemblages, the conspecific-encounter index was consistently high, implying that amphibian communities tend to be highly aggregate in space.