Iσ‐Index, a measure of dispersion of individuals

Population Ecology - 1962
Masaaki Morisita1
1Department of Biology, Faculty of Science, Kyushu University, Fukuoka

Tóm tắt

Conclusion and summary

As the Iσ‐index is neither affected by the mean per sample unit except for regular distribution nor standing on the assumption of any definite type of contagious distribution, it may have the most wide range of application among the ones hitherto deviced for measuring the dispersion of individuals in a population. The relations of the Iσ‐index to ,k of negative binomial distribution and N of binomial distribution as well as the new dispersion index, IB, given in this paper may serve, if necessary, for the analysis of data in the ecological works.

Từ khóa


Tài liệu tham khảo

Evans F. C., 1952, The influence of size of quadrat on the distributional patterns of plant populations, Contrib. Lab. Vert. Biol. Univ. Mich., 54, 1

Morisita M., 1959, Measuring of the dispersion of individuals and analysis of the distributional patterns, Mem. Fac. Sci., Kyushu Univ., Ser. E (Biol.), 2, 215

10.1038/163688a0

Tanaka R., 1961, A field study of effect of trap spacing upon estimates of ranges and populations in small mammals by means of a latin square arrangement of quadrats, Bull. Kochi Women's Univ., Ser. Nat. Sci., 5, 8

10.1007/BF02789792

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Thông tin xuất bản

Population Ecology

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