march 2 lecture handout

march 2 lecture handout - 3/2/2012 Communication Senders...

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3/2/2012 1 Communication • Senders (actors) and Receivers (reactors) • Kinds of signals • Production capabilities and Sensory capabilities • Sensory modalities of signals of insects • Types of information contained in signals • Evolutionary maintenance of signal channels What are Signals • Behaviors and structures intended for use in communication – Emphasis is on “ intended – This contrasts with “cues” which are used by individuals to gain information, but were not designed for that purpose – Examples of cues and signals Example
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3/2/2012 2 Example Attraction of Ips hoppingi to pheromones of other Ips spp. Attraction to conspecifics Attraction to heterospecifics Another Example Frontalin The aggregation pheromone of Dendroctonus frontalis
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3/2/2012 3 Communication • The process in which actors use specially designed signals or displays to modify the behavior of reactors. Kinds of Signals • A signal is a stimulus. • Sensory channels -- the different kinds of stimulus energy used for different sensory modalities • Signals are limited by sensory modalities; actors must be able to produce signals via channels that the reactor receives. – Chemical signal only work when the intended receiver can smell or taste them. What determines signal effectiveness? • How well the actor produces the signal – Sexual selection at work • How well the reactor perceives the signal • How well the signal is matched to the environment in which it occurs
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3/2/2012 4 Features Type of Signal Chemical Acoustic Visual Tactile Range Long Long Medium Short Rate of change Slow Fast Fast Fast Getting past
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march 2 lecture handout - 3/2/2012 Communication Senders...

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