Part B - Technical instructions 
29 
Presenta 
tion of 
results 
(continued) 
Baseline study 
Construction 
phase 
Operation phase 
• Table showing mean bird abundance per km 2 or, in the case of less abundant 
species, average number of individuals per km covered, broken down by months 
indicating the value range and number of mapping cruises. When analysing ship 
based survey data, abundance calculations for swimming birds within the transect 
have to be corrected regarding distance according the (Distance) method described 
by Buckland et al. (2001) either on the basis of own data or alternatively on the 
basis of published factors (e. g. Garthe et al. 2007). 
• (Statistical) presentation of occurrence changes over the assessment period (base 
line study-construction phase-operation phase, BACI design). 
Presentation of distribution for relevant species: 
• Point sightings maps with the original positions of the birds, the positions of ships 
present during the surveys, and the positions of wind turbines. 
• Separate monthly or seasonal grid abundance maps for the most frequently occur 
ring species/groups of species. The geographic reference for all computations is 
rectangles of 2’ latitude and 3’ longitude (WGS 84, degree minute second). The 
rectangles should be aligned with the geographic grid. Size classes should be se 
lected according to Garthe et al. (2004). 
• Movement of ships and helicopters should be documented on the basis of existing 
AIS data (AIS, GPS, VMS) and should be taken into account in the analyses. 
The cumulative evaluation of species that cannot be clearly identified at the species 
level should follow the next highest taxonomic level (e. g. Alcidae, Gaviiformes).