Bioacoustics of Yoyetta cumberlandi

Distribution, habitat and behaviour. Populations are only known to occur in the Cumberland Plains region of western Sydney. Open eucalypt forest, woodland and parkland are inhabited. Males typically call from the upper side of branches and move frequently between singing stations. They generally attempt to call broadly in unison. When populations of Y. cumberlandi sp. nov. are present with those of Y. repetens sp. nov. , both species tend to cluster with their own cohort. Adults have been collected between October and March. Calling song. The typical call of this species consists of repetitive phrases, each comprising a macrosyllable followed by an echeme and then a quiet syllable sequence ( Figure 23 ). The macrosyllable ( n = 2 recordings) ranges between 16 and 18 ms duration and comprises 2–4 syllables (each ranging from 7–8 ms duration, three pulses,), and is followed by a period of silence between 100–110 ms duration. The echeme that follows lasts for 310–410 ms duration, and comprises between 42 and 44 syllables. A soft syllable sequence immediately follows the echeme, lasting 400–500 ms duration. A second period of silence then follows (700–1100 ms duration), which completes the phrase ( Figure 24 ). The phrase duration for the call ranges from 1638 to 1726 ms. The frequency spectrum of the calling song ranges from 5.5 to 12 kHz, with highest energy between 6.5 and 10.5 kHz, and a dominant frequency around 9 kHz ( Figure 23 ).