Research database

Project information
Keywords
Ocean noice, marine mammals
Project title
Arctic Cetaceans and Ocean Noise (ACON)
Year
2017 (2015-2017)
Project leader
Kit M. Kovacs
Geographical localization of the research project in decimal degrees (max 5 per project, ex. 70,662°N and 23,707°E)
79 N 5 W; 81 N 31 E; 78 N, 12 E; 89 N 22 E; 78 N 13E
Participants

National partners: Drs Christian Lydersen (NPI), Laura de Steur (NPI), Rolf Ims (UiT), Jørgen Berge (UNIS) and Øystein Wiig (Uio).

International parterns: Drs Kate Stafford (University of Washington), Peter Tyak (SMRU, University of St Andrews) and Finlo Cottier (SAMS, Scotland).

Flagship
MIKON
Funding Source

 

MIKON plus some additional support from NPI and NRC (via the ICE-whales research project, Økosystem Programme)

Summary of Results

Three primary study elements have dominanted our work in ACON to date.

1) The ACON project has documented the complete annual soundscape for a principle breeding area of the Critically Endangered Spitsbergen bowhead whale population. The soundscape was quasi-pristine much of the year, with low numbers of ships traversing the aea. However, during summer/autumn signals from airgun surveys wer detected more than 12 hrs per day. Mean received peak-to-peak SPLs for loud airgun pulses reached 160.46 +/- 0.48 DB (1 uPa) when seismic-survey ships were close (at 57 km). Bowhead whales were present almost daily October-April in all years studied to data, with singing occurring in almost every hour of the day from November - March. Currently, loud anthropogenic sound sources do not temporally overlap with the peak period of bowhead singing; this is vital to ensure that sound masking does not take place, which could negatively impact bowhead breeding behaviour. This study (Ahonen et al. 2017) provides important baseline data for furture monitoring.

 

2) The extreme singing documented above has been explored structurally. Members of the Spisbergen bowhead whale population produced 184  unique song types over a 3-year period at a site in Fram Strait. Individual songs occurred over short periods, lasting at most some monhts. One hypothesis that might explian this extreme song diversity is that bowhead whales in this area could be a mix of animals from multiple populations - but this in itself does not explain the annual shifting of song types that is taking place. Another hypothesis that seems more likely is that the extreme historical exploitation expeirenced by this population drove selection pressure for extraordinary levels of novelty in males' songs (Stafford et al. submitted to PLOS one - in review).

 

3) Pulsed and tonal signals, as well as echoloctions clicks from narwhals have been studied in Northwestern Fram Strait. Remarkably, this species, similar to bowhead whales, is found in this areas thoughout much of the year. Peak numbers of detections were recorded from August trhouth until October. Fewest detections were consistently recorded in April. In addtion to this strong seasonal patterns, a diel pattern in signally was also found, with more signally taking place during daylight and early twilight than at night. Narwhals are considered to be the Arctic cetacean species that is most vulnerable to climate change, in part due to the reduciton in seaonsl sea ice, as well as increased antrhopogenic activity and noise accompanying sea ice reductions. Knowledge of distribution and seasonal occurence are vital to inform managment and conservation of this endemic Arctic species. These results were presented at the Society for Marine Mammalogy meeting in Halifax in October 2017 and will soon be submitted for publication.

 

Additionally, arrival and departure times of seasonally resident whales are currently under analyses.

Master and PhD-students involved in the project

 

 

For the Management

ACON is producing vital knowledge relevant to managment and conservation of Arctic endemic cetaceans. This includes distributional information as well as current sound exposure levels.

Published Results/Planned Publications

1) Ahonen, H., Stafford, K.M., de Steur L., Lydersen, C., Wiig Ø. and Kovacs, K.M. 2017. The underwater soundcape in western Fram Strait breeding round of Spitsbergen's endangerd bowhead whales. Marine Pollution Bulletin 123: 97-112.

2) Stafford, K.M., Lydersen, C. Wiig, Ø. and Kovacs, K.M. 201x. The Arctic's Pavarotti: extreme complexity in the songs of Spitsbergen's bowhead whales. Submitted to Biology Letters.

3) Ahonen, H., Stafford, K.M. de Steur, L., Lydersen, C. and Kovacs, K.M. Northeast Atlandic narwhal (Monodon monocerus) - a multi-year study of occurrence detected with a passive acoustic recorder. MS - soon to be submitted.

4) Phenology of arrivals and departures of fin and blue whales in the Northeast Atlantic Arctic - signals of climate change. MS - under analyses - to be completed by the end of the project period.

 

 

Communicated Results

Ahonen, H., Kovacs, K.M. and Lydersen, C. 2017. The soundscape where Spitsbergen's critically endangered bowhead whales breed. Research Notes - Fram Forum 2017: 72-75.

Ahonen, H., Stafford, K.; Lydersen, C., de Steur, L., Kovacs, K.M. 2017. Northeast Atlantic narwhal (Monodon monoceros) - a multi-year stuy of occurrence detected with a passive acoustic recorder. 22nd Biennial Conference - Biology of Marine Mammals, Society for Marine Mammalogy, Halifax, Nova Scotia, Canada 22-27 October 2017.

Interdisciplinary Cooperation

 

Marine mammalogy, sound physisc and oceanography come together in ACON to produce exciting interdisciplinary results.

Budget in accordance to results

 

Four primary publications, as well as some outreach results will be published/submitted within the three year project period (3 M budget). This is somewhat lower production than initially envisaged - but autodectors that we had hoped would function did not - so data extraction has been much more laborious than initially thought.

Could results from the project be subject for any commercial utilization
Yes
If Yes

Yes - commercial operators should actively use data such as that from ACON to plan seismic surveys or other potentially disruptive human activities to minimise their negative consequences for animal populations in the High Arctic.

Conclusions

ACON is an exciting and productive programme that has provided a solid start on analysing extensive PAM data from Svalbard and surrounding waters (extending west to Fram Strait) collected by an AURAL acoustic array. It clearly demonstrates the promise of this technology to provide valuable, management-oriented data streams that are essential to mitigate human impacts on sensitive Arctic animal populations. Our Norwegian data should be linked up to circumpolar arrays to provide broad, comparative circumpolar coverage of sound scapes across the Arctic. CAFF and other agencies are actively seeking such data.