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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Description of a bird strike event and its causes at a research platform in the German Bight, North Sea (2011)
Auteurs :	Ralf Aumueller, Auteur ; Karin Boos, Auteur ; Sabine Freienstein, Auteur ; Katrin Hill, Auteur ; Reinhold Hill, Auteur
Type de document :	Article
Dans :	Vogelwarte (49(1) FEB 2011)
Article en page(s) :	9-16
Langues:	Allemand
Résumé :	Aumuller R, Boos K, Freienstein S, Hill K & Hill R (Osterholz-Scharmbeck) 2011: Description of a bird strike event and its causes at a research platform in the German Bight, North Sea. Vogelwarte 49: 9-16.The present work derives from currently undertaken ecological accompanying research at the offshore-windfarm 'alpha ventus', 45 km north of the North Sea island Borkum. Using remote detection techniques and visual observations, we present for the first time since initial data ascertainment in autumn 2003 a complete night's course of a bird mass-migration along with different weather parameters and a directly connected mass collision event at the research platform FINO1 in the night of the 1./2.11.2010. Increasing numbers of migrating birds from northeasterly directions were detected during the early evening of the 1.11.2010 and reached their peak of about 460 radar echoes/h between 19:00 and 20:00 h. Contemporaneous weather changes involving tailwinds changing to direct headwinds, increasing wind velocity and decreasing visibility led the birds to continuously descend to lower heights during the strongest migration period between 19:00 and 1:00 h. From 4:00 h onward, more than 50% of the migrating birds were detected in the lower flight heights of 200 m and below and suggest low-level flights to be a reaction towards sudden bad-weather appearances. Enhanced aggregation of birds in the effected area of FINO1 and operating wind turbines, respectively, increase their potential risk of collision by being drawn to the illuminated structures, and in fact, collisions were detected through video and infrared recordings at FINO1. With 88 birds found dead from the night of the 1./2.11.2010, this event holds fourth position of so far documented mass collision events at FINO1. Because the documentation of such (mass) collision events is generally obfuscated and often methodologically limited, the subsequent assessment of the threat for birds is still unknown. The presented event highlights the daunting quantitative dimensions of casualties with regard to future projected wind turbines.

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