Temporal and environmental influences on the vocal behaviour of a nocturnal bird

Digby, Andrew; Towsey, Michael; Bell, Ben D.; Teal, Paul D.

doi:10.1111/jav.00411

Cited by 25 publications

(21 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We did not control for some factors that may have influenced the moonlight intensity perceived by the Undulated Tinamou, such as cloud cover and moon position with respect to the horizon (Digby et al . 2014, York et al . 2014); future research would ideally include these variables as covariates.…”

Section: Discussionmentioning

confidence: 99%

Nocturnal vocal behaviour of the diurnal Undulated Tinamou (Crypturellus undulatus) is associated with temperature and moon phase

Pérez‐Granados

Schuchmann

2021

Ibis

View full text Add to dashboard Cite

Some diurnal birds vocalize at night but the reason for this has seldom been studied. We monitored the nocturnal vocal activity of the Undulated Tinamou Crypturellus undulatus from June 2015 to May 2016 at three recording stations in the Brazilian Pantanal. We tested whether an index of nocturnal vocal output (number of vocalizations automatically detected) of the species varied over the monitored annual cycle and whether it was related to night temperature and moon phase. The annual pattern of nocturnal vocal output was unimodal, with high vocal activity during September and October (49.9% of the total calls detected) and very low vocal output from January through June (8.5% of the total). The unimodal pattern found suggests that nocturnal vocal activity might be related to mate attraction rather than to territorial defence, for which a more constant pattern would have been expected. The percentage of the moon illuminated was positively associated with nocturnal vocal activity, probably related to the elevated light level on moonlit nights. Nocturnal vocal activity was not associated with minimum air temperature. Nocturnal vocal output was positively associated with vocal output during the preceding night, but not with vocal output during the preceding day, suggesting that it was not directly associated with diurnal calling. This is the first study showing a complete annual cycle of nocturnal vocalizations for a diurnal bird species. Our study provides new evidence regarding the function of and the reasons for nocturnal vocalizations in a diurnal non‐passerine bird and has important implications for continued study of reproductive behaviour in tinamous. Further research should examine whether courtship display is associated with nocturnal vocalizations in this and other species.

show abstract

Section: Discussionmentioning

confidence: 99%

Nocturnal vocal behaviour of the diurnal Undulated Tinamou (Crypturellus undulatus) is associated with temperature and moon phase

Pérez‐Granados

Schuchmann

2021

Ibis

View full text Add to dashboard Cite

show abstract

“…Animal vocal activity is known to change during the night/day cycle corresponding with environmental factors and behaviors such as courtship or territorial defense (Boscolo et al, 2006;Digby et al, 2014;Goymann et al, 2012). These cyclic variations, or phenological patterns, are a key element of animal ecology (Forrest and Miller-Rushing, 2010).…”

Section: Discussionmentioning

confidence: 99%

Monitoring canopy bird activity in disturbed landscapes with automatic recorders: A case study in the tropics

Ducrettet

Forget

Ulloa

et al. 2020

Biological Conservation

View full text Add to dashboard Cite

Tropical forests are facing threats that may affect the dynamics of seed dispersers which participate in the forest regeneration. To implement appropriate conservation programs, it appears necessary to monitor seed dispersers and to estimate their response to local changes. Here, we used non-invasive ecoacoustic methods to monitor the activity of a canopy bird, the White-throated toucan, Ramphastos tucanus, a major seed disperser and flagship species of the Amazonian forest. We deployed nine acoustic recorders over 29 days along a road that connects French Guiana to Brazil. We used template matching to automatically detect the vocalizations of R. tucanus. This method, which can easily be repeated with limited human expertise, detected 1748 recordings with vocalizations. A GLMM analysis was applied to test for a possible effect of habitat type and human activity, while accounting for time of the day and rainfall. The number of vocalizations varied according to time of the day with peaks at dawn and dusk. The number of vocalizations did not differ significantly among sites, they were not affected by habitat type, and they were only marginally influenced by human activity. These results indicate that the vocal activity of a key conservation species can be monitored automatically in a non-invasive way. The species targeted, R. tucanus, does not seem to be significantly impacted by the road and local human activity. This might be related to the mobility of the species, which can easily cross the road, as well as low local forestry pressure.

show abstract

“…It was observed in this paper that a large number of laying hens’ vocalisations arose in the daytime, whereas a small number of vocalisations normally occurred at night. In normal sleep time, birds barely express vocal behaviour, except for nocturnal birds, and a minority of bird species are nocturnal birds [ 40 , 41 ]. In contrast, a flock of laying hens may produce many vocalisations during their feeding time, with a number of vocalisations above 600 (or 40 times per chicken) on an average day.…”

Section: Discussionmentioning

confidence: 99%

A Sound Source Localisation Analytical Method for Monitoring the Abnormal Night Vocalisations of Poultry

Lao

Teng

2018

Sensors

View full text Add to dashboard Cite

Due to the increasing scale of farms, it is increasingly difficult for farmers to monitor their animals in an automated way. Because of this problem, we focused on a sound technique to monitor laying hens. Sound analysis has become an important tool for studying the behaviour, health and welfare of animals in recent years. A surveillance system using microphone arrays of Kinects was developed for automatically monitoring birds’ abnormal vocalisations during the night. Based on the principle of time-difference of arrival (TDOA) of sound source localisation (SSL) method, Kinect sensor direction estimations were very accurate. The system had an accuracy of 74.7% in laboratory tests and 73.6% in small poultry group tests for different area sound recognition. Additionally, flocks produced an average of 40 sounds per bird during feeding time in small group tests. It was found that, on average, each normal chicken produced more than 53 sounds during the daytime (noon to 6:00 p.m.) and less than one sound at night (11:00 p.m.–3:00 a.m.). This system can be used to detect anomalous poultry status at night by monitoring the number of vocalisations and area distributions, which provides a practical and feasible method for the study of animal behaviour and welfare.

show abstract

Temporal and environmental influences on the vocal behaviour of a nocturnal bird

Cited by 25 publications

References 50 publications

Nocturnal vocal behaviour of the diurnal Undulated Tinamou (Crypturellus undulatus) is associated with temperature and moon phase

Nocturnal vocal behaviour of the diurnal Undulated Tinamou (Crypturellus undulatus) is associated with temperature and moon phase

Monitoring canopy bird activity in disturbed landscapes with automatic recorders: A case study in the tropics

A Sound Source Localisation Analytical Method for Monitoring the Abnormal Night Vocalisations of Poultry

Contact Info

Product

Resources

About