Animal communication and honest signals_Sep21Notes

Animal communication and honest signals_Sep21Notes - Animal...

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Animal communication and honest signals
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Communication (message) (meaning) the process by which senders use specially designed signals or displays to modify the behavior of receivers fitness effect Sender Receiver Channel signal
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3 dance language of honeybees (unforced honesty) forager returns to nest, communicates information on location of food patch to nestmates Fitness of forager increases if nestmates help to forage in correct place Fitness of nestmates increases if they find new patch of food quickly Efficient foraging increases inclusive fitness of forager and nestmate Why are signals honest? Sender Receiver signal + + + + Fitness Effects
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e.g., recruitment calls of non-resident ravens a raven intrudes on a territory. calls to recruit other non-residents to food fitness of initial raven increases with the arrival of other intruders (otherwise evicted by territorial pair) fitness of intruders increases with discovery of new food source 1. Fitness interests of sender & receiver coincide signaller is honest, no problem for receiver = “unforced honesty” Why are signals honest? Sender Receiver + +
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1. Fitness interests of sender & receiver coincide = “unforced honesty” Why are signals honest? 2. Fitness interests of sender & receiver in conflict Signaller might benefit from deception Does receiver benefit from information from signals?
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Why are signals honest? 2. Fitness interests of sender & receiver in conflict e.g., male courtship signals Males signal to female to persuade her to mate Fitness of males increases if female permits mating (regardless of phenotype) Fitness of female only increases if she mates with the best mate Fitness Male Quality Female + + + - +/- + poor average high
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Animal communication and honest signals_Sep21Notes - Animal...

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