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      A proposed framework for developing indicators of ecosystem health

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      Hydrobiologia

      Springer Nature

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          Diversity in tropical rain forests and coral reefs.

          The commonly observed high diversity of trees in tropical rain forests and corals on tropical reefs is a nonequilibrium state which, if not disturbed further, will progress toward a low-diversity equilibrium community. This may not happen if gradual changes in climate favor different species. If equilibrium is reached, a lesser degree of diversity may be sustained by niche diversification or by a compensatory mortality that favors inferior competitors. However, tropical forests and reefs are subject to severe disturbances often enough that equilibrium may never be attained.
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            The Nonconcept of Species Diversity: A Critique and Alternative Parameters

            The recent literature on species diversity contains many semantic, conceptual, and technical problems. It is suggested that, as a result of these problems, species diversity has become a meaningless concept, that the term be abandoned, and that ecologists take a more critical approach to species-number relations and rely less on information theoretic and other analogies. As multispecific collections of organisms possess numerous statistical properties which conform to the conventional criteria for diversity indices, such collections are not intrinsically arrangeable in linear order along some diversity scale. Several such properties or "species composition parameters" having straightforward biological interpretations are presented as alternatives to the diversity approach. The two most basic of these are simply ▵1 =[n/n-1][1-Σi (N _i/_N)2 ] =the proportion of potential interindividual encounters which is interspecific (as opposed to intraspecific), assuming every individual in the collection can encounter all other individuals, E(Sn ) = Σi [1-(N-Nin )/(Nn )] =the expected number of species in a sample of n individuals selected at random from a collection containing N individuals, S species, and Ni individuals in the ith species.
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              Cascading Trophic Interactions and Lake Productivity

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                Author and article information

                Journal
                Hydrobiologia
                Hydrobiologia
                Springer Nature
                0018-8158
                1573-5117
                July 1993
                July 1993
                : 263
                : 1
                : 1-44
                Article
                10.1007/BF00006084
                © 1993
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