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Quantifying wedge-tailed shearwater
Swindle, Keith ; Urmston, Jennifer ; Hyrenbach, K. David
PloS one, 2022-03, Vol.17 (3), p.e0265832
[Periódico revisado por pares]
Public Library of Science
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Título:
Quantifying wedge-tailed shearwater
Autor:
Swindle, Keith
;
Urmston, Jennifer
;
Hyrenbach, K. David
Assuntos:
Energy conservation
;
Evaluation
;
Light pollution
;
Management
;
Methods
É parte de:
PloS one, 2022-03, Vol.17 (3), p.e0265832
Descrição:
Attraction to artificial light at night (ALAN) poses a threat to many fledgling seabirds leaving their nests for the first time. In Hawaiʻi, fledgling wedge-tailed shearwaters disoriented by lights may become grounded due to exhaustion or collision, exposing them to additional threats from road traffic and predation. While the timing and magnitude of shearwater fallout varies from year to year, little is known about how changing lighting and environmental conditions influence the risk of grounding for this species. We analyzed 8 years (2012-2019) of observations of road-killed shearwaters along the Kalanianaʻole Highway on Oʻahu to quantify the timing and magnitude of fallout during the fledging season (November-December). Our goal was to compare fallout before (2012-15) and after (2016-19) a transition in highway lighting from unshielded high-pressure sodium (HPS) to full-cutoff light-emitting diode (LED) streetlights. To detect the shearwater response to the lighting regime, we also accounted for three potential environmental drivers of interannual variability in fallout: moon illumination, wind speed, and wind direction. The effects of these environmental drivers varied across years, with moon illumination, wind speed and wind direction significantly affecting fallout in at least one year. Altogether, the interaction between moon illumination and wind speed was the most important predictor, suggesting that fallout increases during nights with low moon and strong winds. The lack of an increase in fallout after the change from HPS to shielded 3000K - 4000K LED streetlights suggests the new streetlights did not worsen the light pollution impacts on wedge-tailed shearwaters on Southeast Oʻahu. However, due to potential species-specific disparities in the behavior and light attraction of petrels, similar studies are needed before energy saving LED lights are implemented throughout the Hawaiian archipelago.
Editor:
Public Library of Science
Idioma:
Inglês
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