@unpublished{
 title = {Changes in bird habitat utilisation around the Horns Rev 1 offshore wind project, with particular emphasis on Common Scoter},
 type = {unpublished},
 year = {2007},
 source = {Report commissioned by Vattenfall A/S},
 pages = {40 pp.},
 publisher = {Report commissioned by Vattenfall A/S by National Environmental Research Institute, University of Aarhus, Denmark},
 id = {a3ccf529-1480-30ba-a1ef-700ca907f47e},
 created = {2020-06-12T12:42:24.987Z},
 file_attached = {false},
 profile_id = {9aa84141-6744-3000-aa2d-8b83b70f0402},
 group_id = {3addd0f7-d578-34d3-be80-24022cc062a1},
 last_modified = {2020-06-12T12:42:24.987Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {false},
 hidden = {false},
 private_publication = {false},
 abstract = {This report presents an analysis of recent changes in waterbird habitat utilisation around the Horns Rev 1 wind farm, with particular emphasis on Common Scoter. Ornithological investigations of waterbird numbers and distribution in the study area around the Horns Rev 1 wind farm were initiated in 1999. As part of a demonstration programme on the environmental feasibility of offshore wind farms a total of 34 surveys of bird distributions were conducted in the period from 1999 until 2005. In late 2005 and early 2006 additional six surveys were conducted in relation to the Horns Rev 2 EIA process. Results from the demonstration programme concluded that the distribu-tion of divers and Common Scoter were adversely affected by the pres-ence of the wind turbines at Horns Rev. In late 2006 and early 2007 Vattenfall A/S maintenance crews and heli-copter pilots reported increasing numbers of Common Scoters present within the wind farm site. On that background a series of four surveys of waterbird distribution in the area was programmed during January to April 2007. Data from surveys in January, February, March and April 2007 showed that Common Scoter was the most numerous bird species in the study area, with a total of 356,635 observed birds. Herring Gulls (7,661), Eider (5,674) and diver sp. (511) were other numerous species in the area. Common Scoters dramatically changed their distribution in the study area during the period from 1999 to 2007 for reasons other than the pres-ence of the turbines. Therefore a comparison of distribution of this spe-cies pre- and post construction of the wind farm, using a traditional BACI concept, was impossible. The analyses presented here thus build on data from the January to April 2004 to 2007. During three out of four surveys in 2007 more Common Scoters than during any previous surveys were recorded within the foot print of the wind farm. On 25 January 2,112 birds, on 15 February 4,624 birds, on 3 March 1,359 and on 1 April 35 Common Scoters were encountered in the wind farm area. Analyses of Common Scoter encounter rates in six 2x2 km grid cells within the wind farm area compared to encounter rates in 14 grid cells in the periphery of the wind farm site showed no significant difference for the three early surveys, while significantly lower encounter rates within the wind farm during a survey on 1 April. Based on the summed data set from 2007 there was no significant difference between encounter rates in the wind farm site a…},
 bibtype = {unpublished},
 author = {Petersen, I. K. and Fox, A. D.}
}

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Ornithological investigations of waterbird numbers and distribution in the study area around the Horns Rev 1 wind farm were initiated in 1999. As part of a demonstration programme on the environmental feasibility of offshore wind farms a total of 34 surveys of bird distributions were conducted in the period from 1999 until 2005. In late 2005 and early 2006 additional six surveys were conducted in relation to the Horns Rev 2 EIA process. Results from the demonstration programme concluded that the distribu-tion of divers and Common Scoter were adversely affected by the pres-ence of the wind turbines at Horns Rev. In late 2006 and early 2007 Vattenfall A/S maintenance crews and heli-copter pilots reported increasing numbers of Common Scoters present within the wind farm site. On that background a series of four surveys of waterbird distribution in the area was programmed during January to April 2007. Data from surveys in January, February, March and April 2007 showed that Common Scoter was the most numerous bird species in the study area, with a total of 356,635 observed birds. Herring Gulls (7,661), Eider (5,674) and diver sp. (511) were other numerous species in the area. Common Scoters dramatically changed their distribution in the study area during the period from 1999 to 2007 for reasons other than the pres-ence of the turbines. Therefore a comparison of distribution of this spe-cies pre- and post construction of the wind farm, using a traditional BACI concept, was impossible. The analyses presented here thus build on data from the January to April 2004 to 2007. During three out of four surveys in 2007 more Common Scoters than during any previous surveys were recorded within the foot print of the wind farm. On 25 January 2,112 birds, on 15 February 4,624 birds, on 3 March 1,359 and on 1 April 35 Common Scoters were encountered in the wind farm area. Analyses of Common Scoter encounter rates in six 2x2 km grid cells within the wind farm area compared to encounter rates in 14 grid cells in the periphery of the wind farm site showed no significant difference for the three early surveys, while significantly lower encounter rates within the wind farm during a survey on 1 April. Based on the summed data set from 2007 there was no significant difference between encounter rates in the wind farm site a…","bibtype":"unpublished","author":"Petersen, I. K. and Fox, A. D.","bibtex":"@unpublished{\n title = {Changes in bird habitat utilisation around the Horns Rev 1 offshore wind project, with particular emphasis on Common Scoter},\n type = {unpublished},\n year = {2007},\n source = {Report commissioned by Vattenfall A/S},\n pages = {40 pp.},\n publisher = {Report commissioned by Vattenfall A/S by National Environmental Research Institute, University of Aarhus, Denmark},\n id = {a3ccf529-1480-30ba-a1ef-700ca907f47e},\n created = {2020-06-12T12:42:24.987Z},\n file_attached = {false},\n profile_id = {9aa84141-6744-3000-aa2d-8b83b70f0402},\n group_id = {3addd0f7-d578-34d3-be80-24022cc062a1},\n last_modified = {2020-06-12T12:42:24.987Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {This report presents an analysis of recent changes in waterbird habitat utilisation around the Horns Rev 1 wind farm, with particular emphasis on Common Scoter. 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Data from surveys in January, February, March and April 2007 showed that Common Scoter was the most numerous bird species in the study area, with a total of 356,635 observed birds. Herring Gulls (7,661), Eider (5,674) and diver sp. (511) were other numerous species in the area. Common Scoters dramatically changed their distribution in the study area during the period from 1999 to 2007 for reasons other than the pres-ence of the turbines. Therefore a comparison of distribution of this spe-cies pre- and post construction of the wind farm, using a traditional BACI concept, was impossible. The analyses presented here thus build on data from the January to April 2004 to 2007. During three out of four surveys in 2007 more Common Scoters than during any previous surveys were recorded within the foot print of the wind farm. On 25 January 2,112 birds, on 15 February 4,624 birds, on 3 March 1,359 and on 1 April 35 Common Scoters were encountered in the wind farm area. 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