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CONTRIBUTORS:
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INSTITUTION ID:
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SERIES TITLE:
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YEAR:
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3
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PUB TYPE:
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Working Paper/Manuscript
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WORKING PAPER NUMBER:
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None
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SUBJECT(S):
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None
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DISCIPLINE:
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Ecology
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HTTP:
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LANGUAGE:
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Chinese
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PUB ID:
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103-410-656
(Last edited on
2005/06/15 11:48:27 GMT-6)
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SPONSOR(S):
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ABSTRACT:
Intra-/inter-specific spatial pattern: Four distribution measurements (variance/mean ratio, chi-square test, Clark-Evans index and Haberman residual analysis) were used. The results are similar: Most species are random distribution, , while many are clumped and rare are regular. The analysis with Pielou’s coefficient of segregation and Goodman’s log-linear method indicated that most species pairs were randomly adjacent, while some positively segregated and rare negatively segregated. With Goodman’s log-linear method, some species pairs appears to be positively associated, rare negatively associated but most are neither. Haberman’s residual analysis proved that heterospecific attraction between species pairs was asymmetrical, i.e., species A is positively/negatively attracted by species B does not indicate that species B would be positively/negatively attracted by species A. In the ravine forest community, both positive attraction and negative attraction are not the common phenomena. There are five types of heterospecific attraction: mutually repulsed, one repulsed one neutral, both neutral, one attracted one neutral, mutually attracted. The relation of “one attracted on repulsed” does not exist. In general, there were more clumped distribution than regular, more positive segregation than negative, more positive association than negative. That is to say, although species tend to be intraspecific attraction and heterospecific repulsion at neighbourhood level, they will be coexistent at a large local level for similar environmental requirements. Thus the species diversity of a community could be maintained.
Relationship between distribution, segregation, association and attraction: Interspecific segregation is related to distribution pattern. Clumped species are more likely to be positively segregated and random or regular species tend to more negatively segregated than clumped species. Among different distribution combinations, clumped-clumped species pairs have a largest proportion of positive segregation but no negative; Clumped-regular pairs and random-random pairs are more possible to have negative segregation. On the contrary, interspecific association and heterospecific attraction is independent of distribution types. Combinations of distribution and attraction have a great influence on segregation. For example, if both species are clumped and mutually repulsed, then they are positively segregated; while both species are randomly distributed and mutually neutral, they are randomly adjacent. In general, mutually attracted species pairs tend to be random neighbours, and mutually repulsed pairs be more positively segregated. However, such relationship is not very significant.
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STATISTICS
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