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High‐resolution SONAR and video techniques were used to quantify the migration behavior, fine structure, and bioluminescent activity of krill sound‐scattering layers (SSLs) in the Gulf of Maine. These SSLs were found to exhibit highly synchronous vertical migration behavior, considerable fine‐scale patchiness, and relatively high levels of stimulable bioluminescent activity. Our findings emphasize the highly variable and dynamic nature of krill distributions, a knowledge of which is essential to understanding their trophic role in marine ecosystems.
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Green et al. (1992) studied this question.
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