AI Article Synopsis
- Disturbance from underwater noise severely threatens critically endangered southern resident killer whales (SRKWs), impacting their feeding behavior in the presence of vessels.
- In 2018, researchers studied how a voluntary vessel slowdown in SRKW critical habitat influenced ship speed and its effects on the whales’ foraging behavior.
- The findings revealed that while ship speed didn't directly affect SRKW behavior, higher ship noise levels significantly reduced their foraging activity, suggesting that reducing ship speed could enhance their feeding opportunities by minimizing disruptive noise.
Article Abstract
Disturbance from underwater noise is one of the primary threats to the critically endangered southern resident killer whales (SRKWs). Previous studies have demonstrated that SRKWs spend less time feeding when vessels are present. In 2018, we measured the effects of a voluntary vessel slowdown action in SRKW critical habitat to assess whether ship speed (and related source level) affects foraging behaviour. Observations of SRKWs and ships were collected from land-based sites on San Juan Island, WA, USA, overlooking the Haro Strait slow-down area. Exploratory analyses found little support for a linear relationship between ship speed and SRKW behaviour, but strong support between received noise level from ships and the probability of SRKWs engaging in foraging activity. Reducing ship speed, and therefore ship noise amplitude will help decrease the probability of ship noise disrupting SRKW foraging activity and may help to increase the proportion of accessible salmon.
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| http://dx.doi.org/10.1016/j.marpolbul.2021.112976 | DOI Listing |
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