Phylogeny of the genus Euterpnosia (Hemiptera, Cicadidae) from Taiwan: adaptive radiations and acoustic behaviour
Date Issued
2008
Date
2008
Author(s)
Chen, Chen-Hsiang
Abstract
Among Euterpnosia genus is the most species genus among Taiwan’s cicadas, 25 species described worldwide, sixteen Euterpnosia species have been recorded in Taiwan, all endemic to Taiwan. This genus is a monophyletic group based on cladistic analysis of morphological data. Analysis demonstrates that the Euterpnosia tree contains a basal polytomy of sister group(E. arisana, E. suishana and E. latacauta) that indicates a rapid radiation. The calling songs produced by males are generally thought to be species-specific, and can be used as a species specific taxonomic character, which is a female choice in sexual selection. Acoustic analysis indicated that the spectrogram of frequence of Euterpnosia are approximately 0-20 kHz with two dominant frequency bandwidths, 1 st dominant frequency bandwidth is approximately 5-10kHz，2 nd dominant frequency bandwidth is approximately 10-17kHz. Acoustic changes might have contributed to reproductive isolation, E. varicolor and E. alpina indicated the character displcement of calling song is an illustration in Guanwu, both its dominant frequency increased for premating isolation. It demonstrates that low divergence in calling song for rapid radiation. E. olivacea is a widespread species in the Eastern Taiwan from Shouka to Tailuge. Inward lobe of E. olivacea of every population form gradual changes, and E. olivacea of Shouka and E. olivacea of Tailuge may be different species. Variation of E. olivacea might be produced by geographical barriers. Phylogeny, acoustic behaviour and population of variations of the genus Euterpnosia seems to display adaptive radiation in Taiwan.
Subjects
Euterpnosia, cicada
calling song
adaptive radiation
character displacement
Type
thesis
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