Testing the efficiency of passive acoustic monitoring and active monitoring in anuran community in lotic environments in Itinguçu State Park, Peruíbe-SP

Isabel G Velasco ¹, Ivan Nunes ^1,2

⁰Programa de Pós-Graduação em Ciências Biológicas (Zoologia), Universidade Estadual Paulista/UNESP, Instituto de Biociências de Botucatu, Distrito de Rubião Júnior, s/n, Rubião Junior, 18618-970 São Paulo, SP, Brazil.

Anais Da Academia Brasileira De Ciencias +

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June 19, 2024

View abstract on PubMed

Summary

This study compared active and passive acoustic monitoring for detecting anurans in lotic environments. Active monitoring proved more efficient overall, though passive acoustic monitoring improved with longer sampling durations.

Area Of Science

Ecology
Bioacoustics
Herpetology

Background

Lotic environments present unique challenges for anuran monitoring.
Passive acoustic monitoring (PAM) is a developing technique for wildlife surveys.
Long-term, continuous PAM in lotic systems remains understudied.

Purpose Of The Study

To evaluate the efficacy of PAM compared to active monitoring for anuran detection in lotic habitats.
To determine if species richness estimates differ between active and passive survey methods.
To assess the influence of sampling duration on PAM efficiency.

Main Methods

Conducted simultaneous active and passive acoustic monitoring at multiple lotic sites.
Utilized 72-hour continuous PAM recordings at 45-day intervals.
Calculated species richness and compared detection efficiencies across methods and scales.

Main Results

Active monitoring was more efficient than PAM across all sampling scales in lotic environments.
Anuran vocalizations occurred both day and night, with a nocturnal peak and acoustic niche overlap.
Waterfall proximity negatively impacted acoustic recording quality; PAM efficiency increased with longer sampling duration.

Conclusions

Active monitoring is currently superior for anuran detection in lotic environments.
PAM shows potential for long-term anuran monitoring, especially with extended deployment periods.
Habitat-specific acoustic conditions (e.g., waterfalls) must be considered for effective PAM implementation.