Environmental sound as a mirror of landscape ecological integrity in monitoring programs

Sánchez‐Giraldo, Camilo; Ayram, Camilo A. Correa; Daza, Juan M.

doi:10.1016/j.pecon.2021.04.003

Cited by 14 publications

(10 citation statements)

References 65 publications

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“…Items framed in black on a white background represent untested variables. Black arrows indicate relationships well supported by the literature (see Fig.2 Sánchez-Giraldo, Correa Ayram & Daza, 2021). Our specific predictions are represented with grey arrows, solid and dashed lines representing positive and negative (predicted) relationships.…”

Section: Introductionsupporting

confidence: 79%

“…Altogether, acoustic indices capture various dimensions of the soundscape such as: anthropophony, technophony, bird activity, abundance of species richness (for more details, see Fig.1 and Sánchez-Giraldo, Correa Ayram & Daza, 2021, Fig.2). They are not necessarily expected to reflect any particular bird-related variable, but should rather be seen as an integrative component of the habitats in which the experiment was conducted.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Decomposing drivers in avian insectivory: large-scale effects of climate, habitat and bird diversity

Schillé

Valdés‐Correcher

Archaux

et al. 2023

Preprint

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According to the Latitudinal Biotic Interaction Hypothesis (LBIH), the general increase in biodiversity towards lower latitudes can be partially explained by an increase in the intensity of biotic interactions. While LBIH received some support for plant-herbivores interactions, much less is known about how higher trophic levels may contribute to shape biotic interactions across latitudinal gradients. We hypothesized that the diversity of insectivorous birds increases towards lower latitude, leading to higher predation rates on insect herbivores. We deployed plasticine caterpillars in 138 oak trees in 47 sites along a 19 degree latitudinal gradient in Europe to quantify bird insectivory through predation attempts. In addition, we used passive acoustic monitoring to (i) characterize the acoustic diversity of surrounding soundscapes; and (ii) infer both taxonomic and functional diversity of insectivorous birds from recordings. The functional diversity of insectivorous birds increased towards lower latitude. Bird predation increased with latitude, forest cover and bird acoustic diversity but decreased with mean annual temperature and functional richness of insectivorous birds. Contrary to our predictions, latitudinal clines in bird predation attempts were not directly mediated by changes in insectivorous bird diversity or acoustic diversity, but latitude and habitat still had independent effects on predation attempts. Our study does not fully support the predictions of the LBIH of more biotic interactions southwards and advocates for better accounting for activity and abundance of insectivorous birds when studying the large-scale variation in insect-tree interactions.

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Section: Introductionsupporting

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Decomposing drivers in avian insectivory: large-scale effects of climate, habitat and bird diversity

Schillé

Valdés‐Correcher

Archaux

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…To date, applications of acoustic indices can be divided into two main analytical frameworks: (i) those describing soundscape patterns and dynamics, and (ii) those using indices as proxies for biodiversity metrics such as species richness or functional diversity (Alcocer et al, 2022). These (i) Supporting data-cleaning workflows by quickly identifying recordings for exclusion prior to other analyses, perhaps because of microphone degradation (Phillips et al, 2018), distortion (Eldridge et al, 2018) or excessive geophony (Metcalf et al, 2020;Sánchez-Giraldo et al, 2021). See Section 6.…”

Section: Identif Ying Your Par Adig Mmentioning

confidence: 99%

“…Indices can reflect biotic vocalisations, habitats and landscape features such as rivers and non‐biological sounds like weather events. Analyses in this paradigm are particularly useful for: Supporting data‐cleaning workflows by quickly identifying recordings for exclusion prior to other analyses, perhaps because of microphone degradation (Phillips et al, 2018), distortion (Eldridge et al, 2018) or excessive geophony (Metcalf et al, 2020; Sánchez‐Giraldo et al, 2021). See Section 6. Rapidly visualising large data sets to facilitate qualitative interpretation.…”

Section: Identifying Your Paradigmmentioning

confidence: 99%

Using acoustic indices in ecology: Guidance on study design, analyses and interpretation

et al. 2023

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The rise of passive acoustic monitoring and the rapid growth in large audio datasets is driving the development of analysis methods that allow ecological inferences to be drawn from acoustic data. Acoustic indices are currently one of the most widely applied tools in ecoacoustics. These numerical summaries of the sound energy contained in digital audio recordings are relatively straightforward and fast to calculate but can be challenging to interpret. Misapplication and misinterpretation have produced conflicting results and led some to question their value. To encourage better use of acoustic indices, we provide nine points of guidance to support good study design, analysis and interpretation. We offer practical recommendations for the use of acoustic indices in the study of both whole soundscapes and individual taxa and species, and point to emerging trends in ecoacoustic analysis. In particular, we highlight the critical importance of understanding the links between soundscape patterns and acoustic indices. Acoustic indices can offer insights into the state of organisms, populations, and ecosystems, complementing other ecological research techniques. Judicious selection, appropriate application and thorough interpretation of existing indices is vital to bolster robust developments in ecoacoustics for biodiversity monitoring, conservation and future research.

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“…The situation is more complex in mid-frequency ranges where more than one vocalizing animal group is active. Other studies have addressed the advantages and disadvantages of different acoustic indices under different environmental conditions, and useful overviews can be found, for example, in Bradfer-Lawrence et al ( 2019), Zhao et al (2019), Ross et al (2021), Sánchez-Giraldo et al (2021), and Shaw et al (2021.…”

Section: Indices To Capture Temporal Patterns Of Acoustic Diversitymentioning

confidence: 99%

Temporal Soundscape Patterns in a Panamanian Tree Diversity Experiment: Polycultures Show an Increase in High Frequency Cover

et al. 2022

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In this ecoacoustic study we used the setting of a tropical tree diversity planted forest to analyze temporal patterns in the composition of soundscapes and to test the effects of tree species richness on associated biodiversity measured as acoustic diversity. The analysis of soundscapes offers easy, rapid and sustainable methods when assessing biodiversity. During the last years the quantification of regional or global acoustic variability in sounds and the analysis of different soundscapes has been evolving into an important tool for biodiversity conservation, especially since case studies confirmed a relationship between land-use management, forest structure and acoustic diversity. Here we analyzed soundscapes from two seasons (dry and rainy season) and aurally inspected a subset of audio recordings to describe temporal patterns in soundscape composition. Several acoustic indices were calculated and we performed a correlation analysis and a non-metric multidimensional scaling analysis to identify acoustic indices that: (i) were complementary to each other and such represented different aspects of the local soundscapes and (ii) related most strongly to differences in acoustic composition among tree species richness, season and day phase. Thus, we chose “High Frequency Cover,” “Bioacoustic Index,” and “Events Per Second” to test the hypothesis that acoustic diversity increases with increasing tree species richness. Monocultures differed significantly from polycultures during night recordings, with respect to High Frequency Cover. This index covers sounds above 8 kHz and thus represents part of the orthopteran community. We conclude that increasing tree species richness in a young tropical forest plantation had positive effects on the vocalizing communities. The strongest effects were found for acoustic activity of the orthopteran community. In contrast to birds, orthopterans have smaller home ranges, and are therefore important indicator species for small scale environmental conditions.

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Environmental sound as a mirror of landscape ecological integrity in monitoring programs

Cited by 14 publications

References 65 publications

Decomposing drivers in avian insectivory: large-scale effects of climate, habitat and bird diversity

Decomposing drivers in avian insectivory: large-scale effects of climate, habitat and bird diversity

Using acoustic indices in ecology: Guidance on study design, analyses and interpretation

Temporal Soundscape Patterns in a Panamanian Tree Diversity Experiment: Polycultures Show an Increase in High Frequency Cover

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