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      COMMUNITY-WIDE EFFECTS OF NONINDIGENOUS SPECIES ON TEMPERATE ROCKY REEFS

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      Ecology
      Wiley-Blackwell

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          Ecological effects of the North Atlantic Oscillation

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            Analysis of feeding preference experiments.

            Published studies of consumer feeding preferences using foods that experience autogenic change in mass, numbers, area, etc., on the time scale of a feeding trial fail to employ appropriate statistical analyses to incorporate controls for those food changes occurring in the absence of the consumer. The studies that run controls typically use them to calculate a constant "correction factor", which is subtracted prior to formal data analysis. This procedure constitutes a non-rigorous suppression of variance that overstates the statistical significance of observed differences. The appropriate statistical analysis for preference tests with two foods is usually a simple t-test performed on the between-food differences in loss of mass (or numbers, area, etc.) comparing the results of experimentals with consumers to controls without consumers. Application of this recommended test procedure to an actual data set illustrates how low replication in controls, which is typical of most studies of feeding preference, inhibits detection of an apparently large influence of previous mechanical damage (simulated grazing) in reducing the attractiveness of a brown alga to a sea urchin.
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              Man's Role in Changing the Face of the Ocean: Biological Invasions and Implications for Conservation of Near-Shore Environments

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                Author and article information

                Journal
                Ecology
                Ecology
                Wiley-Blackwell
                0012-9658
                November 2002
                November 2002
                : 83
                : 11
                : 3182-3193
                Article
                10.1890/0012-9658(2002)083[3182:CWEONS]2.0.CO;2
                3667d417-97c8-4c3f-8b5f-0ba2bf7da407
                © 2002

                http://doi.wiley.com/10.1002/tdm_license_1.1


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