Abstract
Finding and attracting mates can impose costs on males in terms of increased encounters with, and attraction of, predators. To decrease the likelihood of predation, males may modify mate-acquisition efforts in two main ways: they may reduce mate-searching efforts or they may reduce mate-attraction efforts. The specific behavior that males change in the presence of predator cues should depend upon the nature of risk imposed by the type of predator present in the environment. For example, sit-and-wait predators impose greater costs to males moving in search of mates. Here, we test whether cues of the presence of a sit-and-wait predator lead to a reduction in mate-searching but not mate-acquisition behavior. We used a member of the Enchenopa binotata complex of treehoppers—a clade of vibrationally communicating insects in which males fly in search of mates and produce mate-attraction signals when they land on plant stems. We tested for changes in mate-searching and signaling behaviors when silk from a web-building spider was present or absent. We found that males delayed flight when spider silk was present but only if they were actively searching for mates. These results suggest that males have been selected to reduce predation risk by adjusting how they move about their environment according to the cues of sit-and-wait predators.
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Acknowledgments
The authors thank T. Schuck and C. Haen for help with insect and plant care. This work was funded by National Science Foundation Grant IOS-0919962 to RLR, National Science Foundation Grant IOS-1120790 to RLR and KDFF, and SURF funding from the University of Wisconsin-Milwaukee to NA-W and MA-W.
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Communicated by: Sven Thatje
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Fowler-Finn, K.D., Al-Wathiqui, N., Cruz, D. et al. Male Enchenopa treehoppers (Hemiptera: Membracidae) vary mate-searching behavior but not signaling behavior in response to spider silk. Naturwissenschaften 101, 211–220 (2014). https://doi.org/10.1007/s00114-014-1145-7
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DOI: https://doi.org/10.1007/s00114-014-1145-7