Keywords :
Spatial distribution,
Species-abundance relation,
Species-area relation,
Species diversity,
Tropical forest.
บทคัดย่อ :
Connections among species-abundance (i - m i), species-frequency (i - F i), and species-sample size (S, - n)
relationships were examined on the basis of the mapping data of a natural forest in Thailand. The spatial
distribution of individual trees without any discrimination of species was nearly random. Provided that the
spatial distribution of each species was random, the i - m i and the i - F i relationship was reconstructed from
each other in terms of the total number of species (S) and the total number of individuals (N) in the data. The
number of species (S n) in a subsample consisting of n individuals was then obtained from the i - F i
relationship. Logarithm of S, increased with logn and showed a convex curve through the origin. The values
of diversity indices based on N and S (or n and S n) were affected by sample size. These trends were further
examined on the basis of 944 data sets of biotic communities and three mathematical models of an S-N
relationship. The properties of species-area relation were discussed in the light of these results.
เอกสารอ้างอิง :
Kobayashi, S., & Kimura, K. (1994). The number of species occurring in a sample of a biotic community and its connections with species-abundance relationship and spatial distribution. Ecological research, 9(3), 281-294.
