[MARMAM] New paper: "Response of harbor porpoises to different types of acoustic harassment devices and subsequent piling during the construction of offshore wind farms"

Julika Voss j.voss at bioconsult-sh.de
Wed Mar 22 00:18:28 PDT 2023

Dear MARMAM community,

my co-authors Armin Rose, Vladislav Kosarev, Raul Vilela, Ilse van Opzeeland, Ansgar Diederichs and I are delighted to announce our latest paper in Frontiers in Marine Science: "Response of harbor porpoises to different types of acoustic harassment devices and subsequent piling during the construction of offshore wind farms"

Abstract: Before piling of offshore wind farm foundations, acoustic harassment devices (AHDs) are used to drive harbor porpoises out of the area where they could suffer injuries. Until 2017, a combination of pingers and seal scarer devices (usually SPL = 174-193 dB re 1 μPa (rms) @ 1m at 1 to 20 kHz depending on the device) was prescribed for mitigation purposes in Germany. However, seal scarers led to decreased porpoise detection rates in much larger distances than intended, when 750 m is usually rendered sufficient to avoid injuries. Therefore, devices specifically designed for mitigation purposes were developed and are prescribed since then. These acoustic porpoise deterrents (APDs; e.g. FaunaGuard Porpoise Module; SPL = 172 dB re 1 μPa (rms) @ 1m at 60 to 150 kHz) aim to keep the animals away from offshore construction sites but should not lead to large-scale disturbance as caused by a seal scarer. Although project-specific evaluations indicated that APDs are effective, a cross-project analysis and a comparison with data from previous piling procedures employing seal scarers were still pending. The present study aimed to fill this gap. Between March 2018 and April 2019, harbor porpoise detection rates were monitored acoustically in four offshore wind farm projects using CPODs before, during and after piling at different distances up to 10 km from piling. APD operation led to a significant decrease in detection rates in the vicinity of the device, indicating the displacement of the animals from a small-scale area. Depending on the wind farm, detection rates during APD operation decreased by 30 to 100% at 750 m distance compared to 6 hours before APD operation. Furthermore, reduced detection rates during APD operation were only observed up to about 2.5 km distance even when the APD was switched on for over 40 minutes. Given that the extent of disturbance to harbor porpoises is lower when using an acoustic porpoise deterrent compared to the seal scarer, we consider that preferential use of an acoustic porpoise deterrent is an improvement to mitigation strategies and an important step forward to a less harmful piling procedure.

See the full OA paper for further information and please feel free to reach out if you have any questions!


Best wishes,

Julika Voß

BioConsult SH GmbH & Co. KG
Schobüller Str. 36
25813 Husum

Tel: +49 (0) 48 41 77937 94
Fax: +49 (0) 48 41 77937 19

www.bioconsult-sh.de <http://www.bioconsult-sh.de%20>

[cid:image001.png at 01D95C96.BCF3E2D0]

BioConsult SH GmbH & Co. KG. Sitz der Gesellschaft: Husum. Amtsgericht Flensburg: HRA 6160 FL.
Geschäftsführer: BioConsult SH Verwaltungs-GmbH. Sitz der Gesellschaft: Husum.
Amtsgericht Flensburg: HRB 7148 FL.
Geschäftsführer: Dr. Thilo Liesenjohann, Dr. Georg Nehls

Hinweis: Die Speicherung und Verarbeitung Ihrer Daten erfolgt gemäß der DSGVO.
Näheres dazu können Sie der Datenschutzinformation auf unserer Homepage entnehmen.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.uvic.ca/pipermail/marmam/attachments/20230322/b899f773/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 23949 bytes
Desc: image001.png
URL: <http://lists.uvic.ca/pipermail/marmam/attachments/20230322/b899f773/attachment-0001.png>

More information about the MARMAM mailing list