Behaviour 2019
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Tradeoffs in Acoustic Signaling and Movement in Neotropical Forest Katydids
Hannah ter Hofstede1,2,3, Laurel Symes3,4, Tony Robillard5, Sharon Martinson1,3, Jiajia Dong6, Ciara Kernan2, Colleen Miller 7. 1Dartmouth College, Department of Biological Sciences, Hanover, NH, United States; 2Dartmouth College, Graduate Program in Ecology, Evolution, Environment and Society, Hanover, NH, United States; 3Smithsonian Tropical Research Institute, Balboa, Ancón, Panama; 4Cornell University, Center for Conservation Bioacoustics, Ithaca, NY, United States; 5Muséum national d’Histoire naturelle, Institut de Systématique, Evolution et Biodiversité , Paris, Île-de-France, France; 6Xuzhou Medical University, Research Center for Biochemistry and Molecular Biology, Xuzhou, Jiangsu, China; 7Cornell University, Department of Ecology and Evolutionary Biology, Ithaca, NY, United States

The factors influencing acoustic signal structure in animals have been well studied, but we know less about factors that influence how often these signals are repeated over long time scales. Males producing acoustic advertisement signals to attract mates might experience a tradeoff between investment in the duration or complexity of individual calls and signaling over long periods. We measured call parameters and the number of calls per 24 hours in 16 species of sympatric phaneropterine katydids from Panamá. There was a negative relationship between the number of signals per 24 hours and the duration of sound in each signal, but not with the number of pulses per signal. This suggests tradeoffs that limit signal production and duration, but not the structure of individual signals. There was also a negative relationship between the number of signals per 24 hours and proportion of the katydids caught at light traps that were male, likely reflecting males investing either in calling or in searching for females. These cross-taxa tradeoff relationships suggest costs and constraints that fundamentally shape the spatial and temporal dynamics of communication.