Calling behaviour of<i>Elachistocleis matogrosso</i>(Anura, Microhylidae) is associated with habitat temperature and rainfall

Pérez‐Granados, Cristian; Schuchmann, Karl‐Ludwig; Ramoni‐Perazzi, Paolo; Marques, Marinêz Isaac

doi:10.1080/09524622.2019.1658642

Cited by 10 publications

(3 citation statements)

References 46 publications

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“…hourly time, GMT −4; sampling rate, 48 kHz; and resolution, 16 bits per sample. The device was powered by four 1.5 V alkaline batteries parameters were extended in relation to the description of the roar of the species, which should maximize the possibility of detecting weaker roars (see a similar approximation in Pérez-Granados et al, 2020). Kaleidoscope identified a total of 39,021 candidate sounds that matched the signal parameters.…”

Section: Acoustic Monitoringmentioning

confidence: 99%

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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Section: Acoustic Monitoringmentioning

confidence: 99%

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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“…Likewise, positive trend of ADI, and negative of AEI are also a direct effect of an increase in signal amplitude, and consequently on rainfall levels. The core of these index is based on the product of power values in a pre-selected set of frequency bands of the spectrogram, and they reflect the increase in the number of occupied frequency bands during rainfall events (Pekin et al 2012;Bradfer-Lawerence et al 2019). Reduction in the index values of NDSI and NP are associated to the spectral heterogeneity from rainfall and indicates that amplitude changes from rainfall sounds are more evident in low frequency bands.…”

Section: Discussionmentioning

confidence: 99%

“…Because vocal activity of several species is either maintained or stimulated during low intensity rainfalls (e.g. Brauer et al 2016;P erez-Granados et al, 2019), future work will focus on determining the causes of the reduction of acoustic activity during rainfall events. Such reduction could be an intrinsic behavioral response of singing animals or a physical constraint that masks the sounds and complicates the detection of biophonic signals.…”

Section: Discussionmentioning

confidence: 99%

Ecoacoustics in the rain: understanding acoustic indices under the most common geophonic source in tropical rainforests

Sánchez‐Giraldo

Bedoya

Morán-Vásquez

et al. 2020

Remote Sens Ecol Conserv

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Rainfall is one of the most predominant geophonic sources in nature, and the major climatic phenomenon influencing species biology in tropical ecosystems. Although its effects on acoustic indices have been studied, rainfall is recognized as a nuisance factor affecting their estimation. Consequently, files with rainfall sounds are typically removed from ecoacoustic analyses. In tropical rainforests, where rainfall is a common and unpredictable event, its influence on acoustic indices needs to be explicitly examined before implementing acoustic passive monitoring. Using mixed‐effects models we assessed the effect of different rainfall conditions on the direction and magnitude of the values of eight commonly used acoustic indices. We obtained 18336 1‐min recordings from 28 sampling sites in a montane forest on the northern Andes of Colombia between May‐July 2018. We identified 2867 1‐min recordings containing light to heavy rainfall. We found that both rainfall occurrence and its variation in intensity were associated with increases in ACI, ADI, H, and M index values, and decreases in AEI, BI, NDSI, and NP values. The estimated indices exhibited differential sensitivity to rainfall, with M, NDSI, and NP showing higher differences associated with increasing frequency and intensity of rainfall. Regardless the direction of change in index values caused by rainfall, we found that the magnitude of variation depended on the index. For instance, ACI and BI indices showed low sensitivity and can be considered as reliable acoustic metrics, even during heavy intensity rainfall. In contrast, M, NDSI, and NP might lead to misleading inferences, if rainfall events are not considered during calculation. We stress the importance of careful interpretation of biological inferences based on these sensitive indices and encourage an explicit assessment of rainfall, particularly in short‐term acoustic surveys in highly pluvious regions where rainfall is a conspicuous component of the soundscape.

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Occupancy modelling reveals a highly restricted and fragmented distribution in a threatened montane frog (Philoria kundagungan) in subtropical Australian rainforests

et al. 2019

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In the last several decades, habitat loss, overexploitation, invasive organisms, disease, pollution and, more recently, climate change have led to catastrophic declines in amphibian biodiversity. Montane amphibian species, particularly those with narrow distributions and specific habitat requirements are likely to be at particular risk under future climate change scenarios. Despite this, fundamental ecological data are lacking for most of these species. Philoria kundagungan is a poorly known representative of a range-restricted genus of montane amphibians from eastern Australia. Using an occupancy framework, we conducted repeated call playback surveys at 32 sites across the mountainous regions of south-east Queensland and north-eastern New South Wales, Australia, to investigate: (1) the current extent of this species’ geographic range, and (2) environmental predictors of this species’ presence. We found that P. kundagungan has a highly restricted and fragmented distribution, being limited to ~11 km2 of potentially suitable habitat, and that its presence is strongly associated with high elevation (>800 m). Our survey protocol resulted in a high probability of detection (>70%) at occupied sites from relatively few visits. From these baseline data, future studies will have the ability to determine changes in this species’ geographic range and occupancy rate in response to the ever-increasing threats faced by P. kundagungan, thereby supporting more effective conservation strategies and policy decisions.

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Calling behaviour ofElachistocleis matogrosso(Anura, Microhylidae) is associated with habitat temperature and rainfall

Cited by 10 publications

References 46 publications

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

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

Ecoacoustics in the rain: understanding acoustic indices under the most common geophonic source in tropical rainforests

Occupancy modelling reveals a highly restricted and fragmented distribution in a threatened montane frog (Philoria kundagungan) in subtropical Australian rainforests

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