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

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

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98 PRESENTATION OF THE AREA<br />

During the autumn the ß ight shifts upwards, during<br />

2002 to a height between 201 and 400 metres and during<br />

2003 more evenly distributed. The big season related<br />

variation, depends largely on the presence of gulls,<br />

which in turn is explained by the intensity of commercial<br />

Þ shing in the area.<br />

Also during spring and autumn ß ights there are big<br />

season related differences.<br />

During daytime most echoes were recorded below 200<br />

metres, 63.9 % compared to 38.7 % during night time<br />

during the Þ rst year of investigation.<br />

At night most echoes were recorded above 400 metres.<br />

There is also a variation during the 24 hour cycle.<br />

Distribution of flying altitude between spring and autumn<br />

flights<br />

Distribution of flying altitude according to season<br />

Inß uence of weather on the ß ights intensity and<br />

height.<br />

The weather conditions have a strong inß uence on<br />

the migrating pattern, partly the overall weather conditions<br />

and partly the conditions at the break-up area of<br />

the birds. There is correlation between ß ying intensity<br />

and different weather parameters, but these change

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