Signal Costs and Constraints
Decision threshold
Signal detection theory
ROC curves
Signal detection and mate choice
Implications
Sender Costs
Guppy coloration and predation
Frog mating calls attract bats
Male crickets attract females and parasitic Ormia ochracea flies
Female fly ears are tuned to hear male cricket calls
Female red-winged blackbird calls attract predators and defense
Sage grouse displays are costly
Singing consumes energy
Time lost: lekking antelope males donít feed
Conflict with original function
Constraints
Sender constraints
Body size constrains frequency
Constraints on sender learning: HVC and repertoire size
Receiver costs
Code-breaking rove beetle
Receiver constraints
Visual resolution and body size
Hippocampus size and caching
Memory differs in food storing corvids
Memory differences are task dependent
Hippocampus shows experential changes
Transmission constraints
Tactile communication
Email: gw10@umail.umd.edu
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