Effects of Underwater Sound Simulating the Intermediate Scale Measurement System on Fish and Zooplankton of Lake Pend Oreille, Idaho
IDAHO UNIV MOSCOW DEPT OF FISH AND WILDLIFE RESOURCES
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We conducted in-situ experiments to study effects of simulated ISMS sound on zooplankton abundance and biomass, kokanee feeding and growth, predatorpre interactions, kokanee behavior, and kokanee embryo survival. Frequencies of 100,800 and 5,600 Hz at sound pressure levels ranging from 105-167 dB re 1 microPa were used to ensonify aquatic organisms. Response variables from ensonification experiments were compared to controls for evidence of ISMS effects. Neither zooplankton abundance and biomass nor growth of age-0 kokanee were affected as a result of stimulated ISMS ensonification. Similarly, we found no evidence that kokanee embryo survival was reduced as a result of simulated ISMS sound.