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Monday, January 28 • 1:40pm - 2:00pm
(SYMPOSIA-05) The Effect of Weather on Bird-building Collisions in Downtown Minneapolis

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AUTHORS: Sirena Lao, Oklahoma State University; Abigail W. Anderson, University of Minnesota; Robert B. Blair, University of Minnesota; Joanna W. Eckles, Audubon Minnesota; Reed J. Turner, Audubon Minnesota; Scott R. Loss, Oklahoma State University

ABSTRACT: Collisions with buildings are a major source of human-caused bird mortality, especially for migratory species. Most bird-building collision studies have assessed building or landscape-related factors that correlate with mortality, such as glass area, the proximity of glass to vegetation, and the amount of surrounding greenspace. However, very little research has investigated factors causing temporal variation in bird-building collisions, and there is no published research that rigorously quantifies the influence of weather conditions on collision rates of migrating birds. During spring and fall migration, we hypothesize that more collisions occur under two scenarios: when conditions for migration are favorable (e.g., clear conditions, favorable tailwinds, and/or after the passage of a fall cold front), and hence more birds are moving; and when visibility is poor (e.g., fog, storms, or low cloud ceiling), causing migrating birds to potentially “fall out” in urban areas where they may be attracted to artificial light at night. To assess the effect of weather on collisions, we used counts from daily carcass surveys conducted during spring and fall migration of 2017 and 2018 at 21 buildings in downtown Minneapolis, Minnesota, and we compiled hourly weather data from the Minneapolis-Saint Paul weather station for each night from sunset to sunrise. We found that variables associated with favorable migration conditions, including wind direction and temperature, had the largest effect on collision mortality. We also found that weather conditions during certain times of night are especially important, and that collisions can be associated with weather conditions from one or two days prior to the night they occur. Understanding the effect of specific weather conditions on bird-building collisions will allow for the use of weather forecasts to better predict when major collision events will occur, and will therefore allow preemptive actions to be taken to reduce collision mortality.

Monday January 28, 2019 1:40pm - 2:00pm
CENTER STREET ROOM B

Attendees (1)