Abstract
This report describes the monitoring of harbour porpoises at Horns Reef Offshore Wind Farm, Denmark, with emphasis on data collected in 2004. Three 2-day surveys with line transect observations of porpoises were conducted in 2004 and data from acoustic data loggers (TPODs) were collected from January through July. Although new data from 2004 was included in the analysis there were no significant additions to conclusions from previous years' reports. On the contrary, the general conclusions regarding effects of construction and operation of the wind farm on porpoise abundance inside and outside the wind farm area have been weakened somewhat compared to previous reports. The specific conclusions regarding short-time effects of construction activities (especially pile drivings) has not been changed, however. Modelling of the spatial distribution of porpoises in the area demonstrated very weak correlations with static environmental variables (water depth, change in water depth and distance to 6 m depth contour). This highlights the importance of dynamic environmental variables, in particular tide and salinity, in determining the fine-scale distribution of porpoises and their prey in the area. a strong correlation between tide and porpoise abundance observed in the T-POD data on some parts of the reef (high abundance at high
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Tougaard, J;
Carstensen, J;
Wisz, M S;
Teilmann, J;
Bech, N I;
[1]
Skov, H;
[2]
Henriksen, Oluf, D.
[3]
- National Environmental Res. Inst., Roskilde (Denmark)
- DHI - Water and Environment, Hoersholm (Denmark)
- DDH-Consulting A/S, Roskilde (Denmark)
Citation Formats
Tougaard, J, Carstensen, J, Wisz, M S, Teilmann, J, Bech, N I, Skov, H, and Henriksen, Oluf, D.
Harbour porpoises on Horns Reef - Effects of the Horns Reef wind farm. Annual status report 2004.
Denmark: N. p.,
2005.
Web.
Tougaard, J, Carstensen, J, Wisz, M S, Teilmann, J, Bech, N I, Skov, H, & Henriksen, Oluf, D.
Harbour porpoises on Horns Reef - Effects of the Horns Reef wind farm. Annual status report 2004.
Denmark.
Tougaard, J, Carstensen, J, Wisz, M S, Teilmann, J, Bech, N I, Skov, H, and Henriksen, Oluf, D.
2005.
"Harbour porpoises on Horns Reef - Effects of the Horns Reef wind farm. Annual status report 2004."
Denmark.
@misc{etde_20780409,
title = {Harbour porpoises on Horns Reef - Effects of the Horns Reef wind farm. Annual status report 2004}
author = {Tougaard, J, Carstensen, J, Wisz, M S, Teilmann, J, Bech, N I, Skov, H, and Henriksen, Oluf, D.}
abstractNote = {This report describes the monitoring of harbour porpoises at Horns Reef Offshore Wind Farm, Denmark, with emphasis on data collected in 2004. Three 2-day surveys with line transect observations of porpoises were conducted in 2004 and data from acoustic data loggers (TPODs) were collected from January through July. Although new data from 2004 was included in the analysis there were no significant additions to conclusions from previous years' reports. On the contrary, the general conclusions regarding effects of construction and operation of the wind farm on porpoise abundance inside and outside the wind farm area have been weakened somewhat compared to previous reports. The specific conclusions regarding short-time effects of construction activities (especially pile drivings) has not been changed, however. Modelling of the spatial distribution of porpoises in the area demonstrated very weak correlations with static environmental variables (water depth, change in water depth and distance to 6 m depth contour). This highlights the importance of dynamic environmental variables, in particular tide and salinity, in determining the fine-scale distribution of porpoises and their prey in the area. a strong correlation between tide and porpoise abundance observed in the T-POD data on some parts of the reef (high abundance at high tide, low at low tide) supports the importance of this variable. Tide and salinity will be included in a forthcoming analysis of the entire dataset from the monitoring program. (au)}
place = {Denmark}
year = {2005}
month = {Jul}
}
title = {Harbour porpoises on Horns Reef - Effects of the Horns Reef wind farm. Annual status report 2004}
author = {Tougaard, J, Carstensen, J, Wisz, M S, Teilmann, J, Bech, N I, Skov, H, and Henriksen, Oluf, D.}
abstractNote = {This report describes the monitoring of harbour porpoises at Horns Reef Offshore Wind Farm, Denmark, with emphasis on data collected in 2004. Three 2-day surveys with line transect observations of porpoises were conducted in 2004 and data from acoustic data loggers (TPODs) were collected from January through July. Although new data from 2004 was included in the analysis there were no significant additions to conclusions from previous years' reports. On the contrary, the general conclusions regarding effects of construction and operation of the wind farm on porpoise abundance inside and outside the wind farm area have been weakened somewhat compared to previous reports. The specific conclusions regarding short-time effects of construction activities (especially pile drivings) has not been changed, however. Modelling of the spatial distribution of porpoises in the area demonstrated very weak correlations with static environmental variables (water depth, change in water depth and distance to 6 m depth contour). This highlights the importance of dynamic environmental variables, in particular tide and salinity, in determining the fine-scale distribution of porpoises and their prey in the area. a strong correlation between tide and porpoise abundance observed in the T-POD data on some parts of the reef (high abundance at high tide, low at low tide) supports the importance of this variable. Tide and salinity will be included in a forthcoming analysis of the entire dataset from the monitoring program. (au)}
place = {Denmark}
year = {2005}
month = {Jul}
}