Some Indices of Diversity
An index of diversity (H) based on the Shannon-Weaver formula, H = - @^n"1P"i log P"i, fails to reflect significant changes in a community's structure because it is only sensitive to changes in relative abundance of a few of the trophic levels of a community. Over two thirds of t...
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| Veröffentlicht in: | Ecology (Durham) 1968-11, Vol.49 (6), p.1191-1193 |
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| container_title | Ecology (Durham) |
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| creator | Dickman, Mike |
| description | An index of diversity (H) based on the Shannon-Weaver formula, H = - @^n"1P"i log P"i, fails to reflect significant changes in a community's structure because it is only sensitive to changes in relative abundance of a few of the trophic levels of a community. Over two thirds of the species encountered in a typical plankton sample had no significant effect on the index of diversity (H), calculated for that sample. To overcome this, the Shannon-Weaver formula was twice altered by redefining P"i in order to give a new index of community diversity which was sensitive to changes in community structure. P"i defined in terms of relative biomass (H"b) failed to improve the index substantially and P"i was then successfully defined in terms of relative productivity (H"p). An index of community diversity sensitive to changes in relative abundance of all the trophic levels, such as the index H"p, appears to be a necessary prerequisite to comparative community studies. |
| doi_str_mv | 10.2307/1934512 |
| format | Article |
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Over two thirds of the species encountered in a typical plankton sample had no significant effect on the index of diversity (H), calculated for that sample. To overcome this, the Shannon-Weaver formula was twice altered by redefining P"i in order to give a new index of community diversity which was sensitive to changes in community structure. P"i defined in terms of relative biomass (H"b) failed to improve the index substantially and P"i was then successfully defined in terms of relative productivity (H"p). An index of community diversity sensitive to changes in relative abundance of all the trophic levels, such as the index H"p, appears to be a necessary prerequisite to comparative community studies.</description><identifier>ISSN: 0012-9658</identifier><identifier>EISSN: 1939-9170</identifier><identifier>DOI: 10.2307/1934512</identifier><language>eng</language><publisher>Brooklyn, N.Y., etc: Duke University Press</publisher><subject>Bacteria ; Biomass ; Community structure ; Diversity indices ; Plankton ; Productivity ; Species ; Species diversity ; Trophic levels ; Wetland ecology</subject><ispartof>Ecology (Durham), 1968-11, Vol.49 (6), p.1191-1193</ispartof><rights>Copyright 1968 The Ecological Society of America</rights><rights>1968 by the Ecological Society of America</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3221-461a0e8ac842f476aed441b0d54525a341f1e39417ca9043e4da3337a58ece983</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/1934512$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/1934512$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,776,780,799,27846,27901,27902,57992,58225</link.rule.ids></links><search><creatorcontrib>Dickman, Mike</creatorcontrib><title>Some Indices of Diversity</title><title>Ecology (Durham)</title><description>An index of diversity (H) based on the Shannon-Weaver formula, H = - @^n"1P"i log P"i, fails to reflect significant changes in a community's structure because it is only sensitive to changes in relative abundance of a few of the trophic levels of a community. Over two thirds of the species encountered in a typical plankton sample had no significant effect on the index of diversity (H), calculated for that sample. To overcome this, the Shannon-Weaver formula was twice altered by redefining P"i in order to give a new index of community diversity which was sensitive to changes in community structure. P"i defined in terms of relative biomass (H"b) failed to improve the index substantially and P"i was then successfully defined in terms of relative productivity (H"p). An index of community diversity sensitive to changes in relative abundance of all the trophic levels, such as the index H"p, appears to be a necessary prerequisite to comparative community studies.</description><subject>Bacteria</subject><subject>Biomass</subject><subject>Community structure</subject><subject>Diversity indices</subject><subject>Plankton</subject><subject>Productivity</subject><subject>Species</subject><subject>Species diversity</subject><subject>Trophic levels</subject><subject>Wetland ecology</subject><issn>0012-9658</issn><issn>1939-9170</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1968</creationdate><recordtype>article</recordtype><sourceid>K30</sourceid><recordid>eNp1jzFPwzAQhS0EEqEgZrZIIDEFfPbZsUfUFqhUiQEYmCyTXKREbVPsFJR_T6p07VvuDd97p8fYNfAHIXn-CFaiAnHCksHZzELOT1nCOYjMamXO2UWMDR8EaBJ2896uKV1syrqgmLZVOqt_KcS66y_ZWeVXka4Od8I-n-cf09ds-faymD4ts0IKARlq8JyMLwyKCnPtqUSEb14qVEJ5iVABSYuQF95ylISll1LmXhkqyBo5Ybdj7za0PzuKnWvaXdgMLx0Iq1FyBXvqfqSK0MYYqHLbUK996B1wt9_tDrsHUo7kX72i_hjm5tMvsNqg1QAWhtTdmGpi14aj5f8en2Ac</recordid><startdate>196811</startdate><enddate>196811</enddate><creator>Dickman, Mike</creator><general>Duke University Press</general><general>Ecological Society of America</general><general>Brooklyn Botanic Garden, etc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>FIXVA</scope><scope>FKUCP</scope><scope>IOIBA</scope><scope>K30</scope><scope>PAAUG</scope><scope>PAWHS</scope><scope>PAWZZ</scope><scope>PAXOH</scope><scope>PBHAV</scope><scope>PBQSW</scope><scope>PBYQZ</scope><scope>PCIWU</scope><scope>PCMID</scope><scope>PCZJX</scope><scope>PDGRG</scope><scope>PDWWI</scope><scope>PETMR</scope><scope>PFVGT</scope><scope>PGXDX</scope><scope>PIHIL</scope><scope>PISVA</scope><scope>PJCTQ</scope><scope>PJTMS</scope><scope>PLCHJ</scope><scope>PMHAD</scope><scope>PNQDJ</scope><scope>POUND</scope><scope>PPLAD</scope><scope>PQAPC</scope><scope>PQCAN</scope><scope>PQCMW</scope><scope>PQEME</scope><scope>PQHKH</scope><scope>PQMID</scope><scope>PQNCT</scope><scope>PQNET</scope><scope>PQSCT</scope><scope>PQSET</scope><scope>PSVJG</scope><scope>PVMQY</scope><scope>PZGFC</scope></search><sort><creationdate>196811</creationdate><title>Some Indices of Diversity</title><author>Dickman, Mike</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3221-461a0e8ac842f476aed441b0d54525a341f1e39417ca9043e4da3337a58ece983</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1968</creationdate><topic>Bacteria</topic><topic>Biomass</topic><topic>Community structure</topic><topic>Diversity indices</topic><topic>Plankton</topic><topic>Productivity</topic><topic>Species</topic><topic>Species diversity</topic><topic>Trophic levels</topic><topic>Wetland ecology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dickman, Mike</creatorcontrib><collection>CrossRef</collection><collection>Periodicals Index Online Segment 03</collection><collection>Periodicals Index Online Segment 04</collection><collection>Periodicals Index Online Segment 29</collection><collection>Periodicals Index Online</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - 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| fulltext | fulltext |
| identifier | ISSN: 0012-9658 |
| ispartof | Ecology (Durham), 1968-11, Vol.49 (6), p.1191-1193 |
| issn | 0012-9658 1939-9170 |
| language | eng |
| recordid | cdi_proquest_journals_1296430518 |
| source | Jstor Complete Legacy; Periodicals Index Online |
| subjects | Bacteria Biomass Community structure Diversity indices Plankton Productivity Species Species diversity Trophic levels Wetland ecology |
| title | Some Indices of Diversity |
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