Student Initiations

Experts survey results between listening areas

First results of the expert survey on listening areas

John Mayer and Florian Straub

So far, 17 people participated in the survey. For this we would like to thank Ann Marie Ackermann, Wilken Agster, Nils Anthes, Stefan Buchner, Willy Buhl, Andreas Hachenberg, Daniel Kratzer, Rudolf scratches, Christoph Moning, Luis Ramos, Markus Römer, Markus Schmid, Michael Schraut, Roland Steiner and Zsolt Végvári thanks. To assess the experience of ornithologists, multiple personal parameters were queried. Among other things, the number of breeding birds carried out mapping. The results can be seen from the diagram below.

Due to the still small sample size in the intermediate results are not yet derivable to all species, the desired statements. While for some species, the estimates are very close together and a normal distribution emerges (such as red-backed shrike), sprinkle the estimates of other species far and priorities are still not evident (eg wood pigeon). The following are some examples of analysis are presented.

The shrike is distinguished from a classical normal distribution, with a culmination at 100 m. Still appreciate the many ornithologists earshot as better. To the planning of mapping or in the calculation of population densities from Transektzählungen "on the safe side" to be - when in doubt, more of a corporate as an over-estimation of the stock in purchase - would recommend it to the listening area for this kind to be set at 150 meters.

The estimates for the listening area the Goldcrest vary between 20 and 100 m. A major focus is between 50 and 80 m to identify. Hence, the recommendation would be derived when listening area to be set for this type 80m.

The details of the hearing range of wood pigeons vary widely. The estimates vary between 50 and 400 m. A major focus is not visible. A recommendation for a listening area can not be derived. In this type shows that the limits are reached the assessment method. Hence, the demand for targeted investigation would lead to precise measurements.

In conclusion, results from the first interim analysis, the sample size for an assessment of the listening areas of all types is still not sufficient. Desirable would be an interest of at least 50 ornithologists, in order to make the most species are first sufficiently accurate Hörbereichsabschätzung. It should be noted that if for some species with a larger sample of this target can not be achieved. These species may, however, identified by the expert survey and following a detailed investigation is therefore necessary.