Paige Byerly, PhD (@paigebyerly.bsky.social)

Wind Farms and Power Lines: A Dual Threat to Seabirds in Brazil Bird collisions with power lines are a global conservation issue. This study examined the effects of wind farm construction and operation on seabird collisions with power lines in Galinhos, Northeastern Brazil. The research focused on a coastal area with 2.8 km of power lines across two beaches. Data on bird collisions, particularly involving Roseate Terns (Sterna dougallii) and Common Terns (Sterna hirundo), were collected from January 2010 to May 2020. The study aimed to assess collision impacts and the influence of wind farms. Results showed seasonal variation in collisions, peaking in March and declining in July. Wind farm construction correlated with a significant increase in collisions on the adjacent beach, suggesting disruption of migratory routes. Bird flight diverters installed on a power line segment did not significantly reduce collisions overall. These findings emphasize the need for thorough environmental impact assessments for power lines and wind farms to mitigate bird collision risks. The study underscores the complex causes of bird collisions with human-made structures and highlights the combined impacts of wind farms and power lines, calling for enhanced protective measures for vulnerable species. https://doi.org/10.1675/063.048.0201