Vertical distribution of zooplankton: density dependence and evidence for an ideal free distribution with costs.

There is a significant trend in the elevations, indicating that the size classes differ in their mean depth.

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There was no significant difference between the slopes of the individual regressions, but the intercepts were different and showed a clear trend, increasing with Daphnia size class.

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Total density had no significant effect on the factor scores of PC2, but there were significant effects of Size and Tower, a significant Mass × Tower interaction, and a marginally significant Size × Tower interaction.

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