Vocal behavior of the Mountain Hawk-Eagle Nisaetus nipalensis in Taiwan

Huang, Yu‐Chun; Chen, Hou-Chun; Chiang, Po-Jen; Sun, Yuan-Hsun

doi:10.1016/j.gecco.2021.e01655

Cited by 1 publication

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall vocal activity patterns of the Changeable Hawk-Eagle in our study were mostly similar to those of the Mountain Hawk-Eagle (Huang et al 2021), with a lower call rate at dawn and dusk and a peak at midday (Fig. 2).…”

Section: Discussionsupporting

confidence: 71%

“…Gjershaug et al (2020) reported that this call was used during perching, defending a territory, and as a pair-contact call. Huang et al (2021) indicated similar screaming calls of the Mountain Hawk-Eagle were uttered by adult males during courtship displays and when adult females were mobbed by other birds. Whistle calls (call types 2 and 3) were uttered only by begging adult female Changeable Hawk-Eagles in India (Gjershaug et al 2020), and call type 4 was made by begging juveniles in India (Gjershaug et al 2020).…”

Section: Discussionmentioning

confidence: 85%

“…Whistle calls (call types 2 and 3) were uttered only by begging adult female Changeable Hawk-Eagles in India (Gjershaug et al 2020), and call type 4 was made by begging juveniles in India (Gjershaug et al 2020). Repeated notes of call types 5 and 6 may represent begging calls by both adult females and juveniles, if calls had similar meaning to those of the Mountain Hawk-Eagle (Huang et al 2021).…”

Section: Discussionmentioning

confidence: 99%

“…For each call identified, we measured five frequencies (lowest frequency [LF], highest frequency [HF], frequency range [FR], first-quartile frequency [Q 1 F], third-quartile frequency [Q 3 F]) and four temporal parameters (note duration [ND], first-quartile note duration [Q 1 D], third-quartile note duration [Q 3 D], internode duration [ID]) from the spectrograms. We defined a call event as continuous calls with a silent interval of >30 sec between calls (Huang et al 2021). When calls were uttered from a number of individuals, we only considered calls from an individual differentiated by the overlap and distance of calls uttered as well as spectrogram characteristics.…”

Section: Methodsmentioning

confidence: 99%

“…Of the ten Nisaetus species around the world, a total of nine species have been recorded from the Southeast Asian region (Gjershaug 2006). Within the Southeast Asian region, a plethora of ecological studies have been conducted on the Javan Hawk-Eagle ( Nisaetus bartelsi ; Nijman et al 2000, Nijman and van Balen 2003, Gjershaug et al 2004, Prawiradilaga 2006, Kaneda et al 2007, Gunawan et al 2016, Prawiradilaga et al 2016, Septiana et al 2020, Suyitno and Syartinilia 2020) and Mountain Hawk-Eagle ( Nisaetus nipalensis ; Iida et al 2006, Sun et al 2009, Huang et al 2021, Nishibayashi et al 2022). Likewise, other lesser known hawk-eagles have gained interest from researchers over the past two decades (e.g., Flores Hawk-Eagle [Raharjaningtrah and Rahman 2004, Syartinilia and Setiawan 2021, Worho et al 2022] and North Philippine Hawk-Eagle [ Nisaetus philippensis ; Gan et al 2022]).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Vocal Activity Patterns of the Changeable Hawk-Eagle (Nisaetus cirrhatus) in Peninsular Malaysia during Mid-Breeding Season

Mah

Puan

Mohamed

2023

Journal of Raptor Research

View full text Add to dashboard Cite

Vocalization in birds serves an important role in territory establishment and mate attraction as well as maintaining conspecific interactions and providing signals pertaining to food or threat. In Malaysia, most raptor behavioral studies on vocalization have been carried out on nocturnal raptors. Such studies have often been limited by the difficulty of accessing habitats where forest species reside and by raptors' elusive behaviors. We assessed the vocalization and vocal activity patterns of a common diurnal raptor, the Changeable Hawk-Eagle (Nisaetus cirrhatus), in an isolated lowland forest reserve, the Ayer Hitam Forest Reserve in Selangor, Malaysia, in mid-April 2021. Automated bioacoustics recorders were placed for 5 d in four different sites to passively collect the hawk-eagles' vocalizations. We recorded 480 hr of calls over the 5 d and the Changeable Hawk-Eagle uttered at least seven call types, with peak and longer call events at midday (1100 H and 1200 H, respectively). Calls were heard from 30 min before sunrise (0600 H) until shortly after sunset (1900 H). Call type 1 was by far the most common call type (2738 calls over 5 d) and was uttered throughout the day, possibly during flight and when perched. Other call types were uttered from late morning (1000 H) with exception of call type 3, which was uttered earlier (0900 H). Our findings may help provide improved raptor survey methods as well as fill the knowledge gap for diurnal raptor vocalizations in Malaysia.

show abstract

Section: Discussionsupporting

confidence: 71%