Auflistung nach Autor:in "Dähne, Michael"

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Kriterien und Entwicklung eines Modells zur Abschätzung des Störpotentials durch Maskierung beim Einsatz von Luftpulsern (Airguns) in der Antarktis
(Umweltbundesamt, 2021) Siebert, Ursula; Dähne, Michael; Danehl, Sina; Institut für terrestrische und aquatische Wildtierforschung; Deutschland. Umweltbundesamt; Müller, Mirjam
In dieser Studie wurde in drei Schritten analysiert, ob Airgunsignale, die für die Erkundung des Meeresbodens eingesetzt werden, die Kommunikationsreichweiten von marinen Säugetieren in großen Entfernungen beeinflussen können: Zuerst wurde eine Literaturrecherche über die betroffenen Arten und ihre Vokalisation durchgeführt. Im zweiten Schritt wurde die Schallausbreitung von Airgunsignalen bis in Entfernungen von 2.000 km von der Quelle modelliert. Im dritten Schritt wurden die modellierten Störsignale mit den Vokalisationen mariner Säugetiere (Finnwal, Blauwal und Weddellrobbe) überlagert, um die Distanzen zu berechnen in denen deren Kommunikationsreichweiten potentiell verkleinert werden.
Quelle: http://www.umweltbundesamt.de/
Managing the effects of noise from ship traffic, seismic surveying and construction on marine mammals in Antarctica
(2019) Erbe, Christine; Dähne, Michael; Gordon, Jonathan; Herata, Heike; Müller, Mirjam
The Protocol on Environmental Protection of the Antarctic Treaty stipulates that the protection of the Antarctic environment and associated ecosystems be considered in the planning and conducting of all activities in the Antarctic Treaty area. One of the key pollutants created by human activities in the Antarctic is noise, primarily caused by ship traffic (from tourism, fisheries, and research), but also by geophysical research (e.g., seismic surveys) and by research station support activities (including construction). Arguably, amongst the species most vulnerable to noise are marine mammals since they specialise in using sound for communication, navigation and foraging, and therefore have evolved the highest auditory sensitivity among marine organisms. Reported effects of noise on marine mammals in lower-latitude oceans include stress, behavioural changes such as avoidance, auditory masking, hearing threshold shifts, andâ€Ìin extreme casesâ€Ìdeath. Eight mysticete species, 10 odontocete species, and six pinniped species occur south of 60OS (i.e., in the Southern Ocean). For many of these, the Southern Ocean is a key area for foraging and reproduction. Yet, little is known about how these species are affected by noise. We review the current prevalence of anthropogenic noise and the distribution of marine mammals in the Southern Ocean, and the current research gaps that prevent us from accurately assessing noise impacts on Antarctic marine mammals. A questionnaire given to 29 international experts on marine mammals revealed a variety of research needs. Those that received the highest rankings were 1) improved data on abundance and distribution of Antarctic marine mammals, 2) hearing data for Antarctic marine mammals, in particular a mysticete audiogram, and 3) an assessment of the effectiveness of various noise mitigation options. The management need with the highest score was a refinement of noise exposure criteria. Environmental evaluations are a requirement before conducting activities in the Antarctic. Because of a lack of scientific data on impacts, requirements and noise thresholds often vary between countries that conduct these evaluations, leading to different standards across countries. Addressing the identified research needs will help to implement informed and reasonable thresholds for noise production in the Antarctic and help to protect the Antarctic environment. © 2019 Erbe, Dähne, Gordon, Herata, Houser, Koschinski, Leaper, McCauley, Miller, Müller, Murray, Oswald, Scholik-Schlomer, Schuster, van Opzeeland and Janik