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Keywords:

  • Arthropod predation;
  • preference;
  • apostatic selection;
  • anti-apostatic selection

We review published studies in which arthropods were presented with a choice of food types at a range of relative densities. Twenty-four of 28 studies showed frequency-independent preference; 11 studies also showed frequency-dependent preference. Both pro- and anti-apostatic selection were found. In the light of these studies we discuss possible behavioural mechanisms which produce such selection; the potential benefits to the predators and the consequences of such selection for diversity both within and between species.