Jessica Briggs

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A synthesis of two decades of research documenting the effects of noise on wildlife

Biological reviews of the Cambridge Philosophical Society, Jan 26, 2015

Global increases in environmental noise levels - arising from expansion of human populations, tra... more Global increases in environmental noise levels - arising from expansion of human populations, transportation networks, and resource extraction - have catalysed a recent surge of research into the effects of noise on wildlife. Synthesising a coherent understanding of the biological consequences of noise from this literature is challenging. Taxonomic groups vary in auditory capabilities. A wide range of noise sources and exposure levels occur, and many kinds of biological responses have been observed, ranging from individual behaviours to changes in ecological communities. Also, noise is one of several environmental effects generated by human activities, so researchers must contend with potentially confounding explanations for biological responses. Nonetheless, it is clear that noise presents diverse threats to species and ecosystems and salient patterns are emerging to help inform future natural resource-management decisions. We conducted a systematic and standardised review of the s...

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Changes in ambient sound levels observed in relation to the operational status of the Mesa Wind Project Site

The Journal of the Acoustical Society of America, 2015

Type 1 sound level measurements and continuous audio recordings were obtained from two sites near... more Type 1 sound level measurements and continuous audio recordings were obtained from two sites near the Mesa Wind Project Site (MWPS), 100 m and 1500 m from the nearest turbine. The sites were upwind of the turbines. Unexpectedly, MWPS ceased operating 29 days after this project began; data were collected for an additional 127 days. Contrasts in hourly summaries of 1 second 1/3rd octave sound level measurements, controlled for hourly mean wind speed, revealed the contributions of rotating blades. For the near site, at wind speeds below 5 m/s, 1/3rd octave band levels increased starting at about 100 Hz, with distinct spectral peaks appearing between 400 Hz and 2000 Hz. These spectral peaks were less prominent when hourly mean wind speed was 5 m/s or greater. At the far site, small increases in sound level were observed for 1/3rd octave bands at 1 kHz and below when the blades were turning. The levels measured in this study will be compared with levels measured at NPS sites, to evaluate distances at which ope...

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