This environmental impact assessment for Kriegers flak ... - Vattenfall

84 PRESENTATION OF THE AREA
11.6.3 Birds
11.6.3.1 Staging birds
On behalf of the Group, extensive surveys at and
around Kriegers Flak have been carried out by IfAÖ
both on the Swedish and German sides of the area.
The surveys were carried out between April 2002 and
March 2004.
An area of 508 km² has been researched from ships
at 35 different occasions with a distance of 4 km between
the transections.
Observations have also been made 16 times from
aeroplanes in a 840 km² area with 2 km between the
transections.
In total, 24 different bird species were observed.
The distribution between different species that were
Survey area – aeroplane transects
Distribution between different
species
observed from ships is shown in the graph below.
Sea gulls dominate the bird population to 60 %.
Most common are herring gull, Larus argentatus, and
great black-backed gull, Larus marinus, mainly living
of Þ sh remains from Þ shing boats, see Þ gure below.
The herring gull was the only species, which was observed
at all test occasions and during the winter 2003
the population consisted of about 3200 individuals.
Spread over the area, the habitation of herring gull
was registered to between 0.11- 5.17 individuals/km²,
great black-backed gull to 0.02-1.32 individuals per
km², lesser black-backed gull, Laurus fuscus, to 0.01-
0.23 individuals/km², common gull, Larus canus, to
0.1-0.77 individuals/km². Little gull, Larus minutus,
and black headed gull, Laru ridibundus, only rarely
migrate through the area and exist in densities up to 0.1
gräns före
ekonomisk zon