Multi‐trophic Invasion Resistance in Hawaii: Bioacoustics, Field Surveys, and Airborne Remote Sensing

Boelman, Natalie T.; Asner, Gregory P.; Hart, Patrick J.; Martin, Robert E.

doi:10.1890/07-0004.1

Cited by 256 publications

(185 citation statements)

References 30 publications

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“…Several studies have linked the acoustic profile of animal communities with habitat characteristics and/or human disturbances (Sueur et al 2008;Joo et al 2011;Tucker et al 2014). Based on these promising results, the direct influence of biological invasion on acoustic communities in the natural environment needs to be investigated (Boelman et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Cricket calling communities as an indicator of the invasive ant Wasmannia auropunctata in an insular biodiversity hotspot

et al. 2017

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Invasive species are a major concern for the maintenance of ecosystem services and biodiversity but are difficult to mitigate. Upstream solutions to prevent their impact, including their detection, are needed. Wasmannia auropunctata, an invasive ant living in vagile supercolonies, is especially hard to track and is a major threat for tropical ecosystems and local animal communities. As part of such tropical communities, crickets are sensitive to ecological conditions, easy to collect, detectable and identifiable through their species-specific calls. Here, we evaluated the use of an acoustic community of crickets as an indicator of the presence of W. auropunctata in New Caledonia. We evaluated the dominance of the crickets in the soundscape, describe the cricket community structure and diversity along a shrubland to forest gradient, characterize these cricket communities structure and diversity in the light of ongoing invasion by W. auropunctata, and identify cricket species' indicators of the invasion. Acoustic recordings collected on 24 sites were described using humanlistening and spectrographic visualization. The results demonstrated a clear dominance of the cricket group in the New Caledonian nocturnal soundscapes. Each habitat harbored a specific acoustic cricket community related to specific environmental attributes including vegetation height, daily variation of humidity and temperature. The presence of W. auropunctata was significantly associated with a lower cricket acoustic activity and species richness at night. Of the 19 species detected, four nocturnal species were identified as indicator of non-invaded forests and preforests. This work supports the use of acoustic as an alternative method to detect invasion.

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Section: Introductionmentioning

confidence: 99%

Cricket calling communities as an indicator of the invasive ant Wasmannia auropunctata in an insular biodiversity hotspot

et al. 2017

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“…Kacelnik and Krebs 1983). Considering patterns in bird diversity across trophic levels, and incorporating detection of acoustic signals from other taxa such as frogs and insects, will provide further insight into community dynamics and ecosystem functioning in coming years (Boelman et al 2007;Both and Grant 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The Bioacoustic Index (BioA) is calculated as the area under the power spectrum curve across the range of frequencies typically occupied by bird species (2-8 kHz), and is intended to describe the proportion of this acoustic space that is occupied in a recording (Boelman et al 2007). Acoustic Diversity (ADI) is calculated by dividing the frequency range into 10 bins of 1 kHz width each, and returning the Shannon index of the occupancy of these bins for a recording (Villanueva-Rivera et al 2011).…”

Section: Soundscape Indicesmentioning

confidence: 99%

Listening to ecosystems: data‐rich acoustic monitoring through landscape‐scale sensor networks

Ross

Friedman

Dudley

et al. 2017

Ecological Research

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Ecologists have many ways to measure and monitor ecosystems, each of which can reveal details about the processes unfolding therein. Acoustic recording combined with machine learning methods for species detection can provide remote, automated monitoring of species richness and relative abundance. Such recordings also open a window into how species behave and compete for niche space in the sensory environment. These opportunities are associated with new challenges: the volume and velocity of such data require new approaches to species identification and visualization. Here we introduce a newly-initiated acoustic monitoring network across the subtropical island of Okinawa, Japan, as part of the broader OKEON (Okinawa Environmental Observation Network) project. Our aim is to monitor the acoustic environment of Okinawa's ecosystems and use these space-time data to better understand ecosystem dynamics. We present a pilot study based on recordings from five field sites conducted over a one-month period in the summer. Our results provide a proof of concept for automated species identification on Okinawa, and reveal patterns of biogenic vs. anthropogenic noise across the landscape. In particular, we found correlations between forest land cover and detection rates of two culturally important species in the island soundscape: the Okinawa Rail and Ruddy Kingfisher. Among the soundscape indices we examined, NDSI, Acoustic Diversity and the Bioacoustic Index showed both diurnal patterns and differences among sites. Our results highlight the potential utility of remote acoustic monitoring practices that, in combination with other methods can provide a holistic picture of biodiversity. We intend this project as an open resource, and wish to extend an invitation to researchers interested in scientific collaboration.

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“…Previous work provided detailed validation of the remotely sensed canopy water and N results , vegetation height, and canopy fractional cover (Boelman et al 2007;Varga and Asner 2008) along the precipitation gradient in HAVO. For this study, we focused on developing relationships between remote sensing metrics and aboveground biomass stocks.…”

Section: Field Measurementsmentioning

confidence: 99%

Effects of Morella faya tree invasion on aboveground carbon storage in Hawaii

et al. 2009

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The negative effects of biological invasion are often the focus of ecological studies, but few have considered potential positive impacts, such as increased carbon storage, resulting from invasion. We combined airborne imaging spectrometer and LiDAR (light detection and ranging) observations with field measurements to assess if the highly invasive nitrogen-fixing tree Morella faya alters canopy 3-D structure and aboveground biomass (AGB) along a 1,500 mm precipitation gradient in Hawaii. Airborne analysis of canopy water content, leaf nitrogen concentration, fractional canopy cover, and vegetation height facilitated mapping of native-and Morelladominated canopies in rainforest, woodland-savanna and shrubland ecosystems, with Morella detection errors ranging from 0 to 13.4%. Allometric equations were developed to relate the combined LiDAR and spectral data to field-based AGB estimates (r 2 = 0.97, P \ 0.01), and to produce a map of biomass stocks throughout native and invaded ecosystems. The structure of the invasive Morella canopies varied by ecosystem type, and the invader shaded out native understory plants in rainforest zones. Despite a 350% increase in AGB going from shrubland to rainforest, Morella did not increase average AGB in any ecosystem it invaded. Furthermore, spatial distributions of biomass indicated that Morella decreased maximum AGB in the woodland-savanna ecosystems. We conclude that Morella tree invasion does not enhance aboveground carbon stocks in any ecosystem it invades in Hawaii, thereby minimizing its contribution to this potentially important ecosystem service. We also found that the fusion of spectral and LiDAR remote sensing provided canopy chemical and structural data facilitating a landscape assessment of how biological invasion alters on carbon stocks and other ecosystem properties.

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Multi‐trophic Invasion Resistance in Hawaii: Bioacoustics, Field Surveys, and Airborne Remote Sensing

Cited by 256 publications

References 30 publications

Cricket calling communities as an indicator of the invasive ant Wasmannia auropunctata in an insular biodiversity hotspot

Cricket calling communities as an indicator of the invasive ant Wasmannia auropunctata in an insular biodiversity hotspot

Listening to ecosystems: data‐rich acoustic monitoring through landscape‐scale sensor networks

Effects of Morella faya tree invasion on aboveground carbon storage in Hawaii

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