The number of species occurring in a sample of a biotic community and its connections with species-abundance relationship and spatial distribution |
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| Authors: | Shiro Kobayashi Katsuhiko Kimura |
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| Institution: | (1) Faculty of Agriculture, Yamagata University, Tsuruoka, 997 Yamagata;(2) Department of Biology, Faculty of Science, Osaka City University, 558 Osaka, Japan;(3) Present address: Global Environmental Research Division, National Institute for Environmental Studies, Onogawa 16-2, 305 Tsukuba, Ibaraki, Japan |
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| Abstract: | Connections among species-abundance (i-m
i
), species-frequency (i-F
i
), and species-sample size (S
n
-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, thei-m
i
and thei-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 ofn individuals was then obtained from thei-F
i
relationship. Logarithm ofS
n
increased with logn and showed a convex curve through the origin. The values of diversity indices based onN andS(orn andS
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 anS-N relationship. The properties of species-area relation were discussed in the light of these results. |
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| Keywords: | spatial distribution species-abundance relation species-area relation species diversity tropical forest |
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