Consequences of realistic patterns of biodiversity loss: an experimental test from the intertidal zone

Meaghan Walker, Ross Thompson

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Studies of the effects of biodiversity on ecosystem function (BDEF) have largely found positive, saturating relationships. However, these studies have been criticised for generating species loss randomly when real extinctions are strongly biased toward rare species. We investigated BDEF relationships in the mollusc fauna of an intertidal rock platform at Griffiths Point, San Remo, south-east Victoria, Australia. Field surveys found that areas with the lowest function (mollusc biomass) were associated with lowest diversity. Excluding individual species from experimental enclosures affected function differentially depending on species’ initial abundance. Rectangular enclosures were attached to the rock platform enabling molluscs to be enclosed while allowing sea water to flow through. Removal of the most abundant species had a positive effect on mollusc biomass, suggesting an inhibition of the other species in the community. In the absence of the most common species, the less abundant species were more productive in combination than when present singly. Taken collectively, these results provide evidence for a relationship between biodiversity and ecosystem function which is a product of both diversity per se and species identity.
    Original languageEnglish
    Pages (from-to)1015-1022
    Number of pages8
    JournalMarine and Freshwater Research
    Volume61
    Issue number9
    DOIs
    Publication statusPublished - 2010

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    littoral zone
    intertidal environment
    molluscs
    biodiversity
    mollusc
    ecosystems
    Victoria (Australia)
    ecosystem function
    rocks
    testing
    biomass
    extinction
    seawater
    fauna
    loss
    test
    rare species
    rock
    field survey

    Cite this

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    abstract = "Studies of the effects of biodiversity on ecosystem function (BDEF) have largely found positive, saturating relationships. However, these studies have been criticised for generating species loss randomly when real extinctions are strongly biased toward rare species. We investigated BDEF relationships in the mollusc fauna of an intertidal rock platform at Griffiths Point, San Remo, south-east Victoria, Australia. Field surveys found that areas with the lowest function (mollusc biomass) were associated with lowest diversity. Excluding individual species from experimental enclosures affected function differentially depending on species’ initial abundance. Rectangular enclosures were attached to the rock platform enabling molluscs to be enclosed while allowing sea water to flow through. Removal of the most abundant species had a positive effect on mollusc biomass, suggesting an inhibition of the other species in the community. In the absence of the most common species, the less abundant species were more productive in combination than when present singly. Taken collectively, these results provide evidence for a relationship between biodiversity and ecosystem function which is a product of both diversity per se and species identity.",
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    Consequences of realistic patterns of biodiversity loss: an experimental test from the intertidal zone. / Walker, Meaghan; Thompson, Ross.

    In: Marine and Freshwater Research, Vol. 61, No. 9, 2010, p. 1015-1022.

    Research output: Contribution to journalArticle

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    AU - Walker, Meaghan

    AU - Thompson, Ross

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    AB - Studies of the effects of biodiversity on ecosystem function (BDEF) have largely found positive, saturating relationships. However, these studies have been criticised for generating species loss randomly when real extinctions are strongly biased toward rare species. We investigated BDEF relationships in the mollusc fauna of an intertidal rock platform at Griffiths Point, San Remo, south-east Victoria, Australia. Field surveys found that areas with the lowest function (mollusc biomass) were associated with lowest diversity. Excluding individual species from experimental enclosures affected function differentially depending on species’ initial abundance. Rectangular enclosures were attached to the rock platform enabling molluscs to be enclosed while allowing sea water to flow through. Removal of the most abundant species had a positive effect on mollusc biomass, suggesting an inhibition of the other species in the community. In the absence of the most common species, the less abundant species were more productive in combination than when present singly. Taken collectively, these results provide evidence for a relationship between biodiversity and ecosystem function which is a product of both diversity per se and species identity.

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