01993nas a2200133   4500008004100000245007200041210006900113520154900182100001701731700001501748700002801763700002201791856004601813       2001                        eng d00aDUET SINGING AND FEMALE CHOICE IN THE BUSHCRICKET PHANEROPTERA NANA0 aDUET SINGING AND FEMALE CHOICE IN THE BUSHCRICKET PHANEROPTERA N3 aIn the phaneropterine bushcricket Phaneroptera nana both males and females sing, producing a duet. The male's song is answered by a short female 'tick'. A male that receives a response in a defined interval after the end of his chirp usually initiates phonotaxis toward the female. Measurements of temporal, spectral, and energy characters of male chirps indicate that individual males vary considerably in several temporal song characters. Females exhibited equivalent response rates to solitary singing males in laboratory trials regardless of their song characters. However, when simultaneously presented with two singing males, females showed consistent preferences: They responded preferentially to relatively longer chirps produced by larger males. Male chirp rate had no influence on female response, suggesting that females were not influenced by a summation of acoustic input integrated over multiple chirps. Rather, female 'decisions' to respond were probably made following individual chirps.


The selective responses exhibited by Ph. nana females contradict some previous expecta- tions that females in duet signalling systems should be indiscriminate. Selectivity may reflect the reliability with which females can assess male song at a distance and potential disadvantages of attracting multiple suitors.

Laboratory trials indicated that only males receiving a high female response rate actually approach and mate with the female. Thus, this duet signalling system may be relatively resistant to intraspecific exploitation.1 aTauber, Eran1 aCohen, Dan1 aGreenfield, Michael, D.1 aPener, Meir, Paul  uhttps://bio.acousti.ca/zh-hans/node/58449