Sound as a tool in marine ecology, from data on biological noises and the deep scattering layer
In studies of specific populations or communities of different animals, the investigator is concerned largely with relative concentrations of individuals and with their feeding and breeding behavior, migratory habits, etc., as individuals or as groups. Information on these aspects is fundamental to an analysis and understanding of the faciors that operate as controls within the population.
Johnson, Martin W.. 1948. "Sound as a tool in marine ecology, from data on biological noises and the deep scattering layer." Journal of Marine Research 7, (3). https://elischolar.library.yale.edu/journal_of_marine_research/681