The sound of logging: Tropical forest soundscape before, during, and after selective timber extraction

Biological Conservation, Journal Year: 2021, Volume and Issue: 254, P. 108812 - 108812

Published: Jan. 20, 2021

Over half of the world's tropical forests are used for timber extraction by selective logging. Even though these degraded to a variable degree, they still important forest biodiversity. It is not yet known how biodiversity impacted during and immediately after logging, fast it recovers. Here, we use ecoacoustics, specifically recording analysis soundscape dawn time series, monitor immediate impact early recovery We describe results capturing series soundscapes in Bornean lowland before, during, Soundscape saturation, which correlated with number different calls that make up soundscape, dropped significantly logging was carried out. The reduced saturation mostly due loss bird vocalizations, whereas insects did seem be impacted. In space-for-time from same area, equivalent day recovered one year, however began drop again years 2 3 Our suggestive strong effect seasonality on soundscapes. Being able track changes over managed production can ultimately improve our odds avoiding more species extinctions, providing evidence-based recommendations much need recover

Language: Английский

---

hardRain: An R package for quick, automated rainfall detection in ecoacoustic datasets using a threshold-based approach

Ecological Indicators, Journal Year: 2019, Volume and Issue: 109, P. 105793 - 105793

Published: Oct. 18, 2019

Language: Английский

---

Spatial replication and habitat context matters for assessments of tropical biodiversity using acoustic indices

Ecological Indicators, Journal Year: 2020, Volume and Issue: 119, P. 106717 - 106717

Published: Aug. 19, 2020

Approaches to characterise and monitor biodiversity based on the sound signals of ecosystems have become popular in landscape ecology conservation. However, date, validation studies how well acoustic indices reflect observed patterns often relied low levels either spatial or temporal replication, while focussing habitats with similar underlying anthropological geophysical characteristics. For be broadly applicable monitoring, their capacity measure ecological facets soundscapes must robust these potential sources bias. Using two contrasting recording approaches, we examined efficacy four commonly used bird species richness across a tropical forest degradation gradient Northeast Borneo. The comprised intact logged forests, riparian remnants, oil palm plantations, thus providing highly variable anthrophonic geophonic soundscape. We compared degree which derived from automated versus point count methods detected variation inter-habitat richness, as capture changes diversity consequence quantified by high-resolution LiDAR canopy heights. found Acoustic Diversity Index was associated height measured both recorders recordings counts, whereas association between Complexity only using recordings. types recordings, exhibited strongest relationship old growth forest, not linked, suggesting avian does drive its height. No were areas. Our findings underscore utility soundscape approaches degraded landscapes, may proxy for human inventories communities. also show that effective landscape-wide environmental gradients, adequate replication is required, care taken control non-target elements different habitats.

Language: Английский

---

Optimizing bat bioacoustic surveys in human‐modified Neotropical landscapes

Ecological Applications, Journal Year: 2021, Volume and Issue: 31(6)

Published: May 3, 2021

Abstract During the last decades, use of bioacoustics as a non‐invasive and cost‐effective sampling method has greatly increased worldwide. For bats, acoustic surveys have long been known to complement traditional mist‐netting, however, appropriate protocol guidelines are still lacking for tropical regions. Establishing minimum effort needed detect ecological changes in bat assemblages (e.g., activity, composition, richness) is crucial view workload project cost constraints, because detecting such must be reliable enough support effective conservation management. Using one most comprehensive data sets, collected Amazon, we assessed survey required accurately assess completeness assemblage inventories habitat selection fragmented forest landscapes aerial insectivorous bats. We evaluated combination 20 different temporal schemes, which differed regarding number hours per night, nights site, only during wet or dry season, both. This was under two landscape scenarios: primary fragments embedded matrix secondary same fragments, but after they had re‐isolated through clearing forest. found that achieve 90% inventory varied considerably depending on research aim scenario evaluated, averaging ~80 10 before fragment re‐isolation, respectively. Recording more than 4 h night did not result substantial reduction nights. Regarding effects selection, except responses terms richness, diversity, activity were similar across all schemes re‐isolation. However, four six dusk three five site significant could otherwise go unnoticed. Based our results, propose will aid optimize protocols Neotropics.

Language: Английский

---

Loss of temporal structure of tropical soundscapes with intensifying land use in Borneo

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 852, P. 158268 - 158268

Published: Sept. 2, 2022

Conservation and sustainable management efforts in tropical forests often lack reliable, effective, easily-communicated ways to measure the biodiversity status of a protected or managed landscape. The sounds that many species make can be recorded by pre-programmed devices analysed yield measures biodiversity. Interpreting resulting soundscapes has developed along two paths: analysing whole soundscape using acoustic indices, used as proxy biodiversity, focusing on individual either manually automatically recognized from soundscape. Here we develop an intermediate approach divide into frequency categories belonging broad taxonomic groups vocalizing animals. While method was unable distinguish between amphibian mammal communities, it successful assigning parts likely produced birds insects. Applying Borneo revealed that, with increasing land use intensity, i) spectral saturation soundscape, richness, loses dawn dusk peaks, ii) bird communities lose recurrent diurnal patterns, becoming less synchronized across sites, iii) insect Soundscape Saturation increases at night. If are partitioned similarly different regions, our could bridge soundscape-level individual-species level analyses. Regaining synchrony losing nocturnal dominance set simple indicators forest retaining high levels

Language: Английский

---