Effort needed to accurately estimate Vocal Activity Rate index using acoustic monitoring: A case study with a dawn-time singing passerine

Pérez‐Granados, Cristian; Gómez‐Catasús, Julia; Rosa, Daniel Bustillo-de la; Barrero, Adrián; Reverter, Margarita; Traba, Juán

doi:10.1016/j.ecolind.2019.105608

Cited by 20 publications

(26 citation statements)

References 36 publications

(32 reference statements)

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“…; Pérez‐Granados et al. ). Additionally, recent development of low cost and versatile acoustic devices as alternatives to costly commercial automated units (Farina et al.…”

Section: Spatial Samplingmentioning

confidence: 97%

“…Additionally, extending the number of monitored days leads to higher detection probabilities (Pérez‐Granados et al. ; Skalak et al. , but see Thompson et al.…”

Section: Temporal Samplingmentioning

confidence: 99%

“…), coefficient of variance of acoustic activity indices (Pérez‐Granados et al. ), or procrustes superimposition for compositional similarities (Saito et al. ).…”

Section: Temporal Samplingmentioning

confidence: 99%

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A roadmap for survey designs in terrestrial acoustic monitoring

Sugai

Desjonquères

Silva

et al. 2019

Remote Sens Ecol Conserv

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Passive acoustic monitoring (PAM) is increasingly popular in ecological research and conservation programs, with high-volume and long-term data collection provided by automatized acoustic sensors offering unprecedented opportunities for faunal and ecosystem surveys. Practitioners and newcomers interested in PAM can easily find technical specifications for acoustic sensors and microphones, but guidelines on how to plan survey designs are largely scattered over the literature. Here, we (i) review spatial and temporal sampling designs used in passive acoustic monitoring, (ii) provide a synthesis of the crucial aspects of PAM survey design and (iii) propose a workflow to optimize recording autonomy and recording schedules. From 1992 to 2018, most of the 460 studies applying PAM in terrestrial environments have used a single recorder per site, covered broad spatial scales and rotated recorders between sites to optimize sampling effort. Continuous recording of specific diel periods was the main recording procedure used. When recording schedules were applied, a larger number of recordings per hour was generally associated with a smaller recording length. For PAM survey design, we proposed to (i) estimate memory/battery autonomy and associated costs, (ii) assess signal detectability to optimize recording schedules in order to recover maximum biological information and (iii) evaluate cost-benefit scenarios between sampling effort and budget to address potential biases from a given PAM survey design. Establishing standards for PAM data collection will improve the quality of inferences over the broad scope of PAM research and promote essential standardization for cross-scale research to understand long-term biodiversity trends in a changing world.

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“…; Pérez‐Granados et al. ). Additionally, recent development of low cost and versatile acoustic devices as alternatives to costly commercial automated units (Farina et al.…”

Section: Spatial Samplingmentioning

confidence: 97%

“…Additionally, extending the number of monitored days leads to higher detection probabilities (Pérez‐Granados et al. ; Skalak et al. , but see Thompson et al.…”

Section: Temporal Samplingmentioning

confidence: 99%

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A roadmap for survey designs in terrestrial acoustic monitoring

Sugai

Desjonquères

Silva

et al. 2019

Remote Sens Ecol Conserv

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“…One of the major challenges for monitoring birds using ARUs is the difficulty in estimating the number of birds vocalizing around recorders. Although many methods and statistical approaches have been described for estimating bird population density around ARUs, their effectiveness has been tested on only a few species (e.g., Oppel et al 2014, Drake et al 2016, Van Wilgenburg et al 2017, Darras et al 2018, Sebastián-González et al 2018, Bombaci and Pejchar 2019, Pérez-Granados et al 2019c, Yip et al 2020reviewed by Pérez-Granados and Traba 2021). Some methods that are already used for estimating mammal abundance with ARUs have scarcely been tested on birds, for example, passive acoustic cue counting (hereafter cue counting; Hiby andWard 1986, Marques et al 2009, 2011, but see Lambert andMcDonald 2014, Sebastián-González et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Assessment of cue counting for estimating bird density using passive acoustic monitoring: recommendations for estimating a reliable cue rate

Pérez‐Granados¹,

Barrero²,

Traba³

et al. 2021

ACE

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Cue counting is a method developed for estimating vocally active wildlife density by dividing the density of cues (number of cues per unit area surveyed per unit time) by the average cue rate (ACR) at which individuals vocalize. It has been used successfully to estimate whale density using passive acoustic monitoring, but its efficacy has had limited testing in birds. We tested whether cue counting can be used to infer bird abundance using autonomous recording units and estimated the minimum effort required to obtain a reliable cue rate at individual and population levels. We recorded Dupont's Lark (Chersophilus duponti) vocalizations at 31 sites where traditional field censuses were also performed. We estimated the ACR using three methodologies: directional recordings, recordings from an online database of bird sounds (xeno-canto), and behavioral field studies. The ACRs estimated using directional recordings and behavioral field studies were similar, and bird numbers were over and underestimated by 0.8 and 10%, respectively (74-77% of the sampling sites were well estimated). However, the ACR estimated using xeno-canto recordings was much higher than those estimated using the other two methods, and bird numbers were underestimated by 41%. We also performed a cost-effectiveness assessment of the number of individuals and recording durations needed to optimize the estimation of a reliable ACR. We found that ACR estimates were more efficient if long (25 min) recordings were used when < 4 males were recorded, whereas 5-min recordings were more efficient for ≥ 20 males. We conclude that cue counting can be useful to infer bird density around recorders but requires an accurate measure of the ACR. Further research should evaluate the effectiveness of passive cue counting on a large number of species and under different circumstances.Évaluation du comptage des détections pour estimer la densité d'oiseaux à l'aide d'un suivi sonore passif : recommandations pour estimer un taux de détections fiable RÉSUMÉ. Le comptage des détections est une méthode qui a été élaborée pour estimer la densité de la faune active vocalement en divisant la densité de détections (nombre de détections par unité de surface étudiée par unité de temps) par le taux moyen de détections (TMD) auquel les individus chantent ou crient. Cette méthode a été utilisée avec succès pour calculer la densité des baleines à l'aide d'un suivi sonore passif, mais son efficacité a peu été testée chez les oiseaux. Nous avons testé si le comptage des détections pouvait être utilisé pour déduire l'abondance des oiseaux en utilisant des enregistreurs automatisés et avons calculé l'effort minimum requis pour obtenir un taux de détections fiable au niveau des individus et des populations. Nous avons enregistré les manifestations sonores du Sirli de Dupont (Chersophilus duponti) sur 31 sites où des recensements traditionnels ont également été effectués. Nous avons calculé le TMD de trois façons : à partir d'enregistrements directionnels, d'enregistrements provenant d'une ba...

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“…During the dispersal period, vocal output can even be higher than during the breeding season (Pérez‐Granados et al. ), probably due to the presence of young birds.…”

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confidence: 99%

Testing the conspecific attraction hypothesis with Dupont's Larks, a resident species of songbird in central Spain

Pérez‐Granados

Traba

2019

J. Field Ornithol.

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Some birds use social cues, such as the presence of conspecifics, when selecting breeding habitat. This phenomenon, known as conspecific attraction, has been well-documented in migratory species, but has not been assessed for resident species of birds. We used Dupont's Larks (Chersophilus duponti) as a model species to determine if conspecific attraction plays a role in habitat selection by resident species of birds. At our study site in Soria province in central Spain, we monitored two potential habitat patches and one managed site where management actions had provided apparently suitable habitat. At each site, we broadcast recordings of the songs and calls of male Dupont's Larks, and monitored their presence during the breeding season and dispersal period in 2018 using automated recorders and field surveys. No birds were attracted to our study sites. Our results suggest that management of patches of suitable habitat should occur close to areas (within 1 km) already occupied by Dupont's Larks to encourage natural colonization because, based on our results, playback of conspecific vocalizations may not attract the species to new breeding areas. However, additional studies are needed before drawing conclusions about the effectiveness of conspecific attraction for this and other resident species of birds. RESUMEN. Poniendo a prueba la hip otesis de atracci on conespec ıfica con el ave canora residente del centro de España, Chersophilus duponti. Algunas aves utilizan pistas sociales, tales como la presencia de conespec ıficos, cuando seleccionan el h abitat de cr ıa. Este fen omeno, llamado atracci on conespec ıfica, ha sido muy bien documentado en especies migratorias, pero no ha sido evaluado en especies de aves residentes. Utilizamos la Alondra de Dupont (Chersophilus duponti), como especies modelo para determinar si la atracci on de conespec ıficos juega un rol en la selecci on de h abitat de especies residentes. En nuestro lugar de estudio, la provincia de Soria en la parte central de España, monitorizamos dos parches dos parches de h abitat potencial, parche donde las acciones de manejo proveyeron de h abitat aparentemente adecuado. En cada localidad, emitimos grabaciones del canto y llamadas de las alondras, y monitorizamos su presencia durante la epoca de reproducci on y el periodo de dispersi on del 2018, utilizando grabadores autom aticos y censos de campo. Ninguna alondra fue atra ıda a nuestros resultados sugieren que el manejo de parches de h abitat adecuados debe llevarse a cabo en lugares cercanos a areas (dentro de un km) actualmente ocupadas por la pecie para favorecer la colonizaci on de las mismas, ya que seg un nuestros resultados, el uso de grabaciones de conespec ıficos pudiera no atraer individuos a areas nuevas en donde estos puedan reproducirse. Sin embargo, se necesitan estudios adicionales antes de poder concluir sobre la efectividad de la atracci on conespec ıfica, para esta y otras especies de aves residentes.

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Effort needed to accurately estimate Vocal Activity Rate index using acoustic monitoring: A case study with a dawn-time singing passerine

Cited by 20 publications

References 36 publications

A roadmap for survey designs in terrestrial acoustic monitoring

A roadmap for survey designs in terrestrial acoustic monitoring

Assessment of cue counting for estimating bird density using passive acoustic monitoring: recommendations for estimating a reliable cue rate

Testing the conspecific attraction hypothesis with Dupont's Larks, a resident species of songbird in central Spain

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