Advertisement Calls and Reproductive Activity of Hylarana guentheri (Boulenger, 1882) from Bach Ma National Park

Binh V. Ngo, Chung D. Ngo, Xuyen T. Nguyen, Ping-Chun L. Hou, Nhon T. Tran

Abstract


We analyzed variations in advertisement calls from frogs of different localities and reproductive activity of Hylarana guentheri living in a tropical region. We estimated the variation of each call property among three localities of the calling male on acoustical features. The spectral characteristics of single-note and multi-note advertisement calls of the species were described using acoustic spectral parameters. Call duration and dominant frequency were the most stereotyped properties with the average dominant frequency of single-note advertisement call was 1.152 kHz; call rate exhibited an intermediate level of variation among populations; whereas rise time and frequency modulation were highly variable within individuals. Call duration, call rate, and rise time were significantly different between localities. Snout-vent length ranged between 50.2 and 80.2 mm among sexually mature males and between 58.9 and 91.5 mm among females. Histological analyses of testes revealed that sperm did not occur throughout the entire year, indicating discontinuous reproductive activity for males. Reproductive females were observed only during the auxiliary rainy season months (mainly April to July), indicating that females have a seasonal reproductive activity.

Keywords


Amphibia; Anura; Hylarana guentheri; Bach Ma; reproductive activity

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References


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