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The ability to modify vocalizations to compensate for environmental noise is critical
for successful communication in a dynamic acoustic environment. Many marine species
rely on sound for vital life functions including communication, navigation and feeding.
The impacts of significant increases in ocean noise levels from human activities are
a current area of concern for the conservation of marine mammals. Here, we document
changes in calling behaviour by individual endangered North Atlantic right whales
(Eubalaena glacialis) in increased background noise. Right whales, like several bird
and primate species, respond to periods of increased noise by increasing the amplitude
of their calls. This behaviour may help maintain the communication range with conspecifics
during periods of increased noise. These call modifications have implications for
conservation efforts for right whales, affecting both the way whales use sound to
communicate and our ability to detect them with passive acoustic monitoring systems.