Advertisement calls of Limnonectes macrognathus (Anura: Dicroglossidae) and Leptobrachium smithi (Anura: Megophryidae), native frog species from Langkawi, Kedah, Peninsular Malaysia

Bioacoustics information is an essential tool for anuran identification, especially within cryptic species. Here we recorded and analysed 17 calls of a male Limnonectes macrognathus individual and 15 calls of a single male Leptobrachium smithi. A Limnonectes macrognathus individual was caught at Gunung Raya on 13 July 2019, and an individual of male Leptobrachium smithi was caught at Lubuk Semilang on 18 January 2019. These species are native of the Langkawi Archipelago. The calls of Limnonectes macrognathus are short trills while Leptobrachium smithi calls have a single high-pitched ‘Kwak’ call. The advertisement call of Limnonectes macrognathus consists of two types that are emitted at a rate of 1 to 4 calls per minute. Each call lasts for 28.18 ± 29.69 (8.45–131.08) seconds (means ± SD (minimum – maximum)). Leptobrachium smithi produced high-pitched calls which consist of an apparent ‘KWAK’ sound. The advertisement call of Leptobrachium smithi consists of a single-note which is emitted 4–6 times per minute. Each call lasts for 0.22 ± 0.01 (0.21–0.23) seconds.

生物声学信息是无尾类（anuran）物种识别的核心手段，针对隐存物种而言尤为关键。本研究共录制并分析了1只雄性大颌薄趾蟾（Limnonectes macrognathus）的17次鸣唱，以及1只雄性斯密奇拟髭蟾（Leptobrachium smithi）的15次鸣唱。研究个体的捕获信息如下：雄性大颌薄趾蟾于2019年7月13日在拉雅山（Gunung Raya）采获，雄性斯密奇拟髭蟾于2019年1月18日在塞米兰格溪（Lubuk Semilang）采获。该两种蛙类均为兰卡威群岛（Langkawi Archipelago）的土著物种。大颌薄趾蟾的鸣唱为短促颤音，而斯密奇拟髭蟾的鸣唱则为单一声调高尖锐利的"Kwak"叫声。大颌薄趾蟾的求偶鸣唱包含两种类型，鸣唱频次为每分钟1至4次，单次鸣唱时长为28.18 ± 29.69秒（均值±标准差，取值范围8.45–131.08秒）。斯密奇拟髭蟾的鸣唱为高声调，包含清晰可辨的"KWAK"单音；其求偶鸣唱为单音节结构，鸣唱频次为每分钟4至6次，单次鸣唱时长为0.22 ± 0.01秒（取值范围0.21–0.23秒）。