Birds in southern Öresund in relation to the wind farm at ... - Vattenfall

each species we also show summary maps of the distribution before and after the
establishment of the wind farm, whereas maps for the different years separately and divided
upon season (the different winters, springs and autumns) are shown in the appendix.
As is shown in Table 3 different species occur in different proportions in the northern and
southern part of the aerial survey area. Thus the majority of the Red-breasted Mergansers
were found in the Northern area of the study area, whereas the Long-tailed Ducks were
mostly found south of Falsterbo in the Southern area with smaller numbers in the Northern
area. The proportion of Eiders seen in the two parts varied between spring and winter surveys.
In winter most Eiders were seen in the Southern area, whereas more Eiders were found in the
Northern area during spring surveys, related to the large breeding colony on Saltholm and
temporary staging flocks during the migration.
Overall Jacob’s indices for the wind farm area and the adjacent buffer zone (up to 2 km from
the wind farm) are shown in Table 4. In this table we show the indices for the whole preconstruction
period (2001-2005 for the boat surveys, 2006 only for the aerial surveys) in
comparison with the indices for the whole post-construction period (2007-2011 for the boat
surveys, 2008-2011 for the aerial surveys). The indices are commented upon in the species
texts below for respective species. In the species accounts we also show figures of the
variation of indices between years (centered on midwinter).
26