Lentner, R., A. Masoner & F. Lehne
(* = Kurzbeitrag)
Sind Zählungen an Balzplätzen von Auer- und Birkhühnern noch zeitgemäß? Ergebnisse aus dem Raufußhühner-Monitoring Tirol
(von 1994 bis 2006 vergeben)
Bestandsentwicklung, Bestandsgrösse, Monitoring, Balzplatzzählung, Trend, Verbreitung, Schutzmassnahmen
Tetrao urogallus, Tetrao tetrix
Tirol, Österreich, Alpen
Are counts on leks of Capercaillie and Black Grouse still state-of-the-art? Results from grouse monitoring in Tirol, Austria. Results of 675 lek counts of Capercaillie und Black Grouse that took place between 2010 and 2017 as well as data from transect mapping were evaluated. Data from the Tyrolian grouse monitoring in four reference areas were compared with lek counts of 2010 and 2015 collected by the Tyrolian hunting association in the same areas. Results of counts at the leks of both species and transect mappings allow the assessment of changes in population size and spatial occurrence. Age-related differences in the temporal and spatial occurrence of males on leks during spring can limit the scope of the results slightly, especially regarding Capercaillie. The main lek-counting method used by the hunters took place within a certain period and yielded higher numbers as opposed to synchronous counts, recorded on only one day as part of the monitoring.
Estimates of population density based on lek counts are influenced by the size, habitat suitability and isolation of the study areas. Even when comparing the number of males per lek the delimitation of leks can lead to different results. Therefore, only studies with a similar design should be compared.
Lek counts of Capercailie and Black Grouse provide solid data on minimum population size. Hence, lek counts represent a valuable method for determining population trends and population estimates. If carried out by experienced observers and if certain minimum methodological standards are followed, surveys can provide population data over a large area. If these surveys are standardised over longer time periods and accompanied by quality control studies, sufficient information should be available to be able to set specific protective measures for these wonderful species.
PDF Dokument (öffentlich)
PDF Dokument (registrierte Mitglieder)