Small coastal pelagic marine fishes often form mixed schools containing two or more species. Individuals of a less abundant species, which are entrained in schools that are dominated numerically by a more abundant species, may be adversely impacted. This may help to account for an observed pattern of strong alternations in dominance between sardines and anchovies in a number of regions of the world’s oceans.
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Bakun et al. (1999) studied this question.
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