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      Feeding plasticity of two detritivore-shredders

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      Freshwater Biology
      Wiley-Blackwell

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          Detritus Processing by Macroinvertebrates in Stream Ecosystems

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            Shredders and Riparian Vegetation

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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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                Author and article information

                Journal
                Freshwater Biology
                Freshwater Biol
                Wiley-Blackwell
                0046-5070
                1365-2427
                August 1994
                August 1994
                : 32
                : 1
                : 133-142
                Article
                10.1111/j.1365-2427.1994.tb00873.x
                a5737fe3-5a8d-4dc6-88a3-e00deaed885a
                © 1994

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


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