LIFESCI 2D03 Chapter Notes - Chapter 8: Camouflage, Stimulus Modality, Mealworm
6 Sep 2018
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6. 1 animals find food using a variety of sensory modalities: natural selection favours those modalities that most efficiently and accurately provide information about the location of food, but the efficiency of a modality can vary with environmental conditions. They use all three sensory modalities to find prey and the more modalities they use, the better their hunting success. Cryptic coloration reduced predator efficiency in trout: trout juveniles live in streams and hunt invertebrates that that have different emergence times over the year, trout possess tetrachromatin color vision four different types of cones. In later experiments, other researchers confirmed that when jays form a search image of one moth type, their ability to find other moth types is reduced. This prediction is called the zero-one rule: also, we find that the diet breadth is affected by the abundance of the most profitable prey items and not by the abundance of the least profitable items.
