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Mooney, T. A., Woods Hole Oceanographic Institution, Woods Hole, USA, amooney@whoi.edu
Streets, A. ., University of Maryland, College Park, USA,
Hanlon, R. T., Marine Biological Laboratory, Woods Hole, USA, rhanlon@mbl.edu


While responses to sound have been described in many underwater vertebrate species (e.g., mammals and fish), considerably less attention has been paid to marine invertebrates. Among cephalopods, this is surprising because squid comprise a key component of the ocean’s biomass and play a central role in many marine ecosystems. Here we describe physiological and behavioral responses to sound in squid (Loligo pealeii). Physiological responses were measured using auditory evoked potentials. Hearing ranges and thresholds were established for both pressure and particle-motion components of a sound field. Physiological responses were generated between 20 and 500 Hz, with lowest thresholds between 100-200 Hz. Acceleration alone and brief, low-frequency centered pulses also generated responses. Behavioral responses (jetting and body patterning changes) were initiated in a narrower frequency range (50-300 Hz) and at levels 15-20 dB higher then physiological thresholds. Results suggest squid likely “hear” similar to fish and that squid can sense acoustic stimuli from predators, prey, and ambient or anthropogenic sources. These novel findings are important for understanding controls on habitat ranges, prey selection and predator avoidance in a key marine invertebrate.


Session #:186
Date: 2/23/2012
Time: 12:15
Location: 151

Presentation is given by student: No