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Author (up) Hüppop, O.; Hilgerloh, G. url  doi
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  Title Flight call rates of migrating thrushes: effects of wind conditions, humidity and time of day at an illuminated offshore platform Type Journal Article
  Year 2012 Publication Journal of Avian Biology Abbreviated Journal Journal of Avian Biology  
  Volume 43 Issue 1 Pages 85-90  
  Keywords Animals  
  Abstract Many bird species call during migration, but call rates not necessarily reflect migration intensity. They rather seem to increase under deteriorating flight conditions. Often, nocturnal mass collisions at illuminated structures coincide with such conditions and are accompanied with high call rates of migrants. Thus, call rates could act as an indicator for situations with high collision risk for birds namely at off shore sites with hardly any alternatives for landing. In the face of increasing numbers of off shore wind farms knowledge about the environmental conditions in which maximum call rates occur, is needed for mitigation measures.

In this first long-term study at an off shore site in the southern North Sea we investigated the effect of weather on the frequency of flight calls of three thrush-species at an illuminated platform. Flight calls were registered automatically during three autumn migration seasons. Besides generally higher call rates from 5 to 2 h before until 6 h after midnight, call rates increased with tailwinds, a change of the tailwind component during the first part of the night, off shore crosswinds and very high humidity.

A monitoring programme is suggested that could help to reduce mass mortalities at illuminated structures.
 
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0908-8857 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kyba @ Serial 1396  
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