Monitoring the annual vocal activity of two enigmatic nocturnal Neotropical birds: the Common Potoo (Nyctibius griseus) and the Great Potoo (Nyctibius grandis)

Pérez‐Granados, Cristian; Schuchmann, Karl‐Ludwig

doi:10.1007/s10336-020-01795-4

Cited by 39 publications

(41 citation statements)

References 36 publications

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“…Wilson & Watts 2006, Penteriani et al . 2010, Pérez‐Granados & Schuchmann 2020b, but see Cadbury 1981, Reino et al . 2015) and diurnal bird species (La 2012, Dickerson et al .…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, previous research in the same study area found no relationship between vocal activity of two nocturnal bird species ( Nyctibius spp.) and nocturnal air temperature (Pérez‐Granados & Schuchmann 2020b). Moreover, low‐frequency sounds, such as the Undulated Tinamou call (dominant frequency of 1280 Hz, Pérez‐Granados et al .…”

Section: Discussionmentioning

confidence: 99%

“…The nocturnal light level at full moon is much higher than at new moon (Kronfeld-Schor et al 2013) and the increase in light level on moonlit nights seems to stimulate the nocturnal vocal activity of several nocturnal (e.g. Wilson & Watts 2006, Penteriani et al 2010, P erez-Granados & Schuchmann 2020b, but see Cadbury 1981, Reino et al 2015 and diurnal bird species (La 2012, Dickerson et al 2020, but see Foote et al 2017. Vocalizing at night can be risky, especially at elevated light levels, because it may increase predation risk (Mougeot & Bretagnolle 2000, Schmidt & Belinski 2013.…”

Section: Discussionmentioning

confidence: 99%

“…Because nocturnal vocal activity of the Undulated Tinamou is very seasonal (see Results and Fig. 3), we focused the analyses on the period between 1 August 2015 and 31 December 2015, the five months with significantly high and consistent vocal activity of the species during the night (see similar approximation in Pérez‐Granados & Schuchmann 2020b, 2020c). Nocturnal vocal activity outside this period was too low to permit analysis of differences related to weather or moon illumination.…”

Section: Methodsmentioning

confidence: 99%

“…To evaluate the effectiveness of the automated detection applied by Kaleidoscope Pro we estimated the recall rate of the recognizer, defined as the proportion of target species vocalizations detected by the recognizer (Knight et al 2017). The recall rate was estimated by dividing the total number of tinamou calls detected by Kaleidoscope by the total number of calls detected by CPG, after visually and acoustically checking 240 recordings of a selected dataset (Knight et al 2017, P erez-Granados & Schuchmann 2020b. We randomly selected a total of 120 15-min nocturnal recordings with presence of the species, according to Kaleidoscope Pro (40 recordings per station) and 120 15-min recordings randomly selected within the dataset (40 recordings per station).…”

Section: Acoustic Data Analysesmentioning

confidence: 99%

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

Pérez‐Granados

Schuchmann

2021

Ibis

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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.

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“…Wilson & Watts 2006, Penteriani et al . 2010, Pérez‐Granados & Schuchmann 2020b, but see Cadbury 1981, Reino et al . 2015) and diurnal bird species (La 2012, Dickerson et al .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Acoustic Data Analysesmentioning

confidence: 99%

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

Pérez‐Granados

Schuchmann

2021

Ibis

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Passive acoustic monitoring of the diel and annual vocal behavior of the Black and Gold Howler Monkey

Pérez‐Granados

Schuchmann

2021

American J Primatol

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Using autonomous recording units to identify and monitor western yellow‐billed cuckoo habitat

Beauregard,

Theimer,

Sferra

et al. 2024

Wildlife Society Bulletin

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Autonomous recording units (ARUs) paired with signal classification software can be used to detect species‐specific calls, making them useful for evaluating patterns in avian occurrence and activity. However, classification of target signals is not always reliable and may be especially challenging for species that vocalize infrequently. We assessed the use of ARUs to identify and monitor habitat for a cryptic and federally threatened distinct population segment, the western yellow‐billed cuckoo (Coccyzus americanus) in mountainous xeroriparian drainages. Using Kaleidoscope Pro, we developed a call‐classifier and processed acoustic data collected in sites also surveyed using traditional human‐observer methods, applying the same spatial and temporal detection criteria to estimate breeding territories for each method. The classifier detected a total of 4,061 true positive calls at 4 sites, had an overall precision score of 0.07, recall score of 0.09, and F‐score (beta = 1) of 0.08, indicating high false positive and false negative classification rates. Our results were, however, consistent with other ARU studies of rare and cryptic species and ARUs estimated occupancy as effectively as human surveys with as little as 2 hours of daily recording. Total detections varied among sites, likely due to differences in cuckoo population densities and the interaction between topography and ARU detection space. Our results suggest that despite performance shortcomings of call‐classifiers, ARUs can be effective for monitoring cuckoos, with potential for providing higher resolution temporal and spatial information on activity and habitat use and may be particularly effective in remote locations where cuckoos often occur.

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Monitoring the annual vocal activity of two enigmatic nocturnal Neotropical birds: the Common Potoo (Nyctibius griseus) and the Great Potoo (Nyctibius grandis)

Cited by 39 publications

References 36 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

Passive acoustic monitoring of the diel and annual vocal behavior of the Black and Gold Howler Monkey

Using autonomous recording units to identify and monitor western yellow‐billed cuckoo habitat

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