SEEN - SE European Bird Migration Network
Orientation tests data elaboration - present state and future prospects
Agnieszka Ożarowska, Krzysztof Muś
Bird Migration Research Station, University of Gdańsk, Poland

The orientation cage tests data elaboration procedures used up till were based on an assumption of unimodal pattern of bird behaviour. According to available data multimodal behaviour of migrants tested in orientation cages was common phenomenon. It did not depend on a cage type, which was used for tests nor time, when the tests were performed (day- vs. night-time tests). As a consequence a new method of cage tests data elaboration was proposed.
Applying of this method to unimodal distributions gave results similar to those obtained with a method used up till now. Applying of the new method to multimodal distributions resulted in patterns that reflected real complex behaviour of tested migrants. This was in contrast with the previous method, which resulted in final patterns that differed from the experimental data, because of averaging procedures applied. Some disadvantages of the new method were also given. To overcome these problems advanced mathematical data modelling procedures based on Bayesian statistics are proposed. Results are very promising …  
Created by Pronetix 2006