A5020327876- Marine animal studies overview
- Underwater Acoustics Research
- Animal Vocal Communication and Behavior
- Arctic and Antarctic ice dynamics
- Underwater Vehicles and Communication Systems
- Diatoms and Algae Research
- Arctic and Russian Policy Studies
- Aquatic and Environmental Studies
- Food Supply Chain Traceability
- Maritime Navigation and Safety
- Acoustic Wave Phenomena Research
- Marine Bivalve and Aquaculture Studies
- Physics and Engineering Research Articles
- Maritime and Coastal Archaeology
- Marine and fisheries research
University of Veterinary Medicine Hannover, Foundation
2014-2024
Acoustic deterrent devices (ADDs) are used to deter seals from aquacultures but exposure of harbour porpoises (Phocoena phocoena) occurs as a side-effect. At construction sites, by contrast, ADDs the zone in which pile driving noise can induce temporary threshold shifts (TTSs). emit such high pressure levels that there is concern themselves may TTS. A porpoise human care was exposed an artificial ADD signal with peak frequency 14 kHz. significant TTS found, measured auditory evoked...
Exploitation of renewable energy from offshore wind farms is substantially increasing worldwide. The majority turbines are bottom mounted, causing high levels impulsive noise during construction. To prevent temporary threshold shifts (TTS) in harbor porpoise hearing, single strike sound exposure (SELSS) restricted Germany by law to a maximum 160 dB re 1 μPa2s at distance 750 m the source. Underwater recordings pile driving strikes, recorded construction an farm German North Sea, were...
Odontocetes have evolved a rich diversity of prey- and habitat-specific foraging strategies, which allows them to feed opportunistically on locally temporally abundant prey. While strategies been documented for some odontocete species, this is less known the harbour porpoise (Phocoena phocoena). We collected multiple years acoustic data using echolocation click loggers analyse occurrence buzzing behaviour, indicating feeding, in German Wadden Sea (North Sea). Seasonal, diel tidal effects...
Testing the hearing abilities of marine mammals under water is a challenging task. Sample sizes are usually low, thus limiting ability to generalize findings susceptibility towards noise influences. A method measure harbor porpoise thresholds in situ outdoor conditions using auditory steady state responses brainstem was developed and tested. The used on 15 live-stranded animals from North Sea during rehabilitation, shortly before release into wild, 12 wild incidentally caught pound nets...
Acoustic Harassment Devices (AHD) are widely used to deter marine mammals from aquaculture depredation, and pile driving operations that may otherwise cause hearing damage. However, little is known about the behavioural physiological effects of these devices. Here, we investigate responses harbour porpoises (Phocoena phocoena) a commercial AHD in Danish waters. Six were tagged with suction-cup-attached DTAGs recording sound, 3D-movement, GPS (n = 3) or electrocardiogram 2). They then exposed...
Abstract The North Sea faces intense ship traffic owing to increasing human activities at sea. As harbour seals ( Phoca vitulina ) are abundant top predators in the Sea, it is hypothesised that they experience repeated, high-amplitude vessel exposures. Here, we test this hypothesis by quantifying noise exposures from deployments of long-term sound and movement tags (DTAGs) on nine Wadden Sea. An automated tool was developed detect intervals elevated recordings. assessment multiple raters...
Abstract The harbour porpoise ( Phocoena phocoena ) is considered part of the ‘Outstanding Universal Value’ characterising Wadden Sea World Heritage Site (WS WHS). Trilateral Plan aims to preserve conservation status Cooperation Area, encompassing WS WHS. plan has specified two targets for porpoise: (1) viable stocks and a natural reproduction capacity (2) habitat quality its conservation. To assess current occurrence in area, we collated analysed data from regional national research...
Abstract Several mass strandings of sperm whales occurred in the North Sea during January and February 2016. Twelve animals were necropsied sampled around 48 h after their discovery on German coasts Schleswig Holstein. The present study aims to explore morphological variation primary sensory organ whales, left right auditory system, using high-resolution computerised tomography imaging. We performed a quantitative analysis size shape cochleae landmark-based geometric morphometrics reveal...
In-air anthropogenic sound has the potential to affect grey seal (Halichoerus grypus) behaviour and interfere with acoustic communication. In this study, a new method was used deliver signals seals as part of an in-air hearing assessment. Using in-ear headphones adapted ear inserts allowed for measurement auditory brainstem responses (ABR) on sedated exposed 5-cycle (2-1-2) tone pips. Thresholds were measured at 10 frequencies between 1–20 kHz. Measurements made using subcutaneous electrodes...
Large rivers like the Elbe or Weser are periodically entered by harbor porpoises of North Sea. They may even move 97 km upstream to port Hamburg, where their presence is highest in spring. This migration believed be related important anadromous prey species travelling for spawning. An acoustic flowmeter Hamburg emits signals hearing range porpoises. The pulses have a duration 0.2 ms, peak frequency 28 kHz, source level 210 dB re 1 µPa and an inter-pulse interval 4.2 s. continuously emitted...
This study investigates whether an exposure to two different received sound pressure levels at equal cumulative energy affects anti-predator behaviour and auditory detection thresholds of common roach (Rutilus rutilus) sand goby (Pomatoschistus minutus) differently. was examined in regard a vessel slowdown as management strategy decrease noise impact on fishes. Using continuous broadband noise, we found significant temporary threshold shifts (TTS) roach, with 11.9 13.4 dB 250 1000 Hz...