Christian Hach | Universität Trier (original) (raw)
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Papers by Christian Hach
Many publications include large-scale quantifications of bird-window collisions. Klem (1990a), th... more Many publications include large-scale quantifications of bird-window collisions. Klem (1990a), the most-cited author concerning bird strikes, assumes 1 to 10 fatal bird collisions per building and year that presumably result in 100 million to 1 billion annual bird killings in the USA. In many cases, Klem’s calculations were adopted quite uncritically for further extrapolations of bird strikes at different spatial scales. Owing to unexpectedly low numbers of bird kills during comprehensive carcass surveys in the course of our bird-strike studies in Trier (Germany, Rhineland-Palatinate) in 2012, the aim of this paper was to discuss the sources of bias inherent in large-scale extrapolations like in Klem’s studies. These factors might explain the discrepancies between our low numbers of collision victims in Trier and the much higher expectation values after Klem, which are not solely attributable to observer or scavenger bias. Furthermore, we introduce two different rating approaches fo...
Many publications include large-scale quantifications of bird-window collisions. Klem (1990a), th... more Many publications include large-scale quantifications of bird-window collisions. Klem (1990a), the most-cited author concerning bird strikes, assumes 1 to 10 fatal bird collisions per building and year that presumably result in 100 million to 1 billion annual bird killings in the USA. In many cases, Klem’s calculations were adopted quite uncritically for further extrapolations of bird strikes at different spatial scales. Owing to unexpectedly low numbers of bird kills during comprehensive carcass surveys in the course of our bird-strike studies in Trier (Germany, Rhineland-Palatinate) in 2012, the aim of this paper was to discuss the sources of bias inherent in large-scale extrapolations like in Klem’s studies. These factors might explain the discrepancies between our low numbers of collision victims in Trier and the much higher expectation values after Klem, which are not solely attributable to observer or scavenger bias. Furthermore, we introduce two different rating approaches fo...