Active Acoustics and Light Data from the Polar Night in Svalbard ...
We tested the impact of artificial light from a research vessel on fish and zooplankton distribution and abundance during the polar night (January 2018) in Svalbard, Norway. All lights from the Helmer Hanssen were turned off for 49 min (January 9), 178 min (January 14) or 9 min (January 17) before b...
| Main Authors: | , |
|---|---|
| Format: | Dataset |
| Language: | unknown |
| Published: |
Canadian Cryospheric Information Network
2019
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.21963/13104 https://www.polardata.ca/pdcsearch/PDCSearch.jsp?doi_id=13104 |
| Summary: | We tested the impact of artificial light from a research vessel on fish and zooplankton distribution and abundance during the polar night (January 2018) in Svalbard, Norway. All lights from the Helmer Hanssen were turned off for 49 min (January 9), 178 min (January 14) or 9 min (January 17) before being turned on again. Change in the acoustic backscatter was recorded from the hull-mounted EK60 (18 kHz, 38 kHz, and 120 kHz). The ping rate was set to maximum and pulse length to 1024 µs. The echosounder was calibrated using the standard sphere method. To measure the spatial impact of artificial light footprint from the ship, an Acoustic Zooplankton and Fish Profiler (AZFP 38 kHz, 125 kHz, 200 kHz, 455 kHz; ASL Environmental Science, Victoria, Canada) was deployed from a small boat (Polarcirkel™) stationary but at varying distances from the Helmer Hanssen. Vertical resolution varied from 37 cm on January 9 and 2 cm on January 14 and 17. The pulse duration was 1000 µs, ping rate 0.33 Hz (i.e. 1 ping 3 sec-1) and ... : Light pollution from a ship disrupts Arctic fish and zooplankton behaviours down to 200m depth. The purpose of this study is to investigate how light pollution from a ship affects the vertical distribution of macrozooplankton and pelagic fish communities around the ship, and assess the potential for bias in biological surveys carried out from ships artificially illuminating an otherwise dark environment. ... |
|---|