A Brief Review of Known Effects of Noise on Marine Mammals
Level 5 - mechanism / opinion, no new human data
Narrative review of non-human observational and descriptive literature; Level 5 by design analogy.
OpenAlex W2110831084 · doi:10.46867/ijcp.2007.20.02.09
What was done
Narrative review synthesizing documented findings on the biological and behavioral impacts of anthropogenic sound on marine mammals, with an emphasis on cetaceans (including beaked whales, Southern resident killer whales, and western gray whales). No systematic search strategy, eligibility criteria, or included study counts are reported in the abstract.
What was found
The abstract reports no quantitative values, effect sizes, or statistical metrics. It describes qualitative documented impacts of anthropogenic noise across marine mammals, including changes in vocalizations, respiration, swim speed, diving, and foraging behavior; displacement, avoidance, migration path shifts, stress, hearing damage, and strandings. Reactions vary by species, age, sex, prior exposure, and behavioral context. Apparent tolerance can mask severe or lethal consequences, acoustically induced strandings pose severe demographic risks to small resident beaked whale populations, and noise is implicated in the decline or lack of recovery of Southern resident killer whales and western gray whales.
Why it matters
The paper emphasizes that a lack of obvious behavioral avoidance does not signify safety for exposed marine mammals. It connects localized acoustic disturbances to potential long-term demographic and population-level consequences in vulnerable cetacean stocks.
Limits
The abstract provides a qualitative narrative synthesis without quantitative data, sample sizes, or systematic review protocols. Proposed population-level consequences (e.g., energetic deficits, reduced reproduction, and higher predation) represent theoretical extrapolations from observed short-term behavioral alterations.
Cited by
- supports Noise pollution from large ships and motorized watercraft damages whale and dolphin hearing, disrupting their long-distance sound communication and navigation.