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Shiro TSUYUZAKI
Plant community ecology / Environmental conservation

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

(Update on Feb. 11 2009. Revise on Dec. 31 2010)

Cluster analysis

Types

Aglomerative strategy

Nearest neighbor method (single-linkage method)
Mountford average-linkage method
Farthest neighbor method (complete-linkage method)

Divisive strategy

Phytosociology - not recommended in general
TWINSPAN (two-way indicator species analysis) (Hill 1979)

Phytosociology

A system for classifying plant communities by means of the tabulation of data collected by quadrats

Nomenclature
  • Weber HE, Moravec J & Theurillat J-P. 2000. International code of phytosociological nomenclature. 3rd edition. Journal of Vegetation Science 11: 739-768
TWINSPAN

flow
Fig. Flowchart of TWINSPAN. RA = reciprocal averaging 


       SITE
       11  1
       219807631245
sp. 9  211-3-------  0000
sp. 5  53415-------  0001
sp. 3  452113------  0010
sp.11  3254-5------  0011
sp. 8  -1---53-----  01
sp. 2  -5414545-424  100
sp. 1  231--3221411  101
sp. 6  ----22-23411  1100
sp.10  --142-135553  1101
sp. 7  ----------34  1110
sp.12  ----------54  1110
sp. 4  -----151----  1111
       000000111111
       000001001111
       00011 010011
       00101   0101
       01

Table. Output of TWINSPAN

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References

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