NEW RECORDS OF ECHOLOCATION CALLS OF Hipposideros khaokhouayensis
DOI:
https://doi.org/10.18173/2354-1059.2024-0027Keywords:
bat, echolocation, Hipposideridae, Laos, VietnamAbstract
Phou Khao Khouay leaf-nosed bat (Hipposideros khaokhouayensis) is a globally rare and vulnerable species of the family Hipposideridae. It has been known only from the type locality in Laos and two localities in Vietnam. Its echolocation calls were included in several publications but still poorly understood. Between November 2023 and April 2024, the authors conducted three field surveys in Lang Son province and Hai Phong city, northeastern Vietnam, in order to seek further understanding of its potential distribution and echolocation behavior. Twelve adult individuals of the species were captured using harp traps and mist nets for identification in the field based on their morphological diagnoses to confirm the target species' identity. The PCTape system was employed to record echolocation calls while bats were emerging from caves. Seven sound parameters (CF frequency, CF duration, tFM frequency, tFM bandwidth, tFM duration, pulse duration, and inter-pulse interval) of the recorded calls were analyzed and measured using the Selena software. Their values are in a range of 90.2 - 91.1 kHz, 3.1 - 8.9 ms, 75.6 - 84.5 kHz, 6.1 - 15.0 kHz, 0.9 - 1.7 ms, 4.5 - 10.1 ms and 15.1 - 31.4 ms, respectively. The present study results are considerably different from descriptions in previous publications. This paper also provides the first data on the inter-pulse interval of the species echolocation calls and a methodological note on this sound parameter.
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