ENT test 2 review

ENT test 2 review - Insects and Human Society Test 2 Insect...

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Insects and Human Society Test 2 Insect Senses and Communication *Communication : Production of a signal by an individual that influences the behavior of another individual and is adaptive to one or both participants *Signal: Any characteristic under selection to inform or convey info. (may be a behavior, a chemical, sound, or light *Insect Senses: 1. Vision *Photoreceptors *Insects have two compound eyes *Ommatidia are hexagonal facets that make up the eye *they are connected to the nervous system *compound eyes can have anywhere from 1 to 10’s of thousands of facets *more than 30,000 facets in the dragonfly compound eye *termites, ants, etc. don’t have as many *Form or pattern perception: *Bees (and others) percieve brokenness or flickering in patterns *Can distinguish between shapes (p 71) *Notice that bees tend to land on flowers shaking in the wind *Optomotor Response: *Flying insects can tell the direction and speed they are moving by observing the movement of patterns around them *Importance for movement perception *Distance Perception (Insects CAN percieve depth) *Binocular vision is required *While human eyes can converge on points in the distance, insects rely on ommatidia to fix on a point *Insects can see ultraviolet light (we can’t) but not red and orange (see wavelength diagram p. 71)
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*Nectar guides *Provide odor and color cues *Richer colors toward center of flower where the food is- this is where insects are attracted *Simple eyes *Ocelli
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