Presentation Details
| Auditory Looming and Intensity Response to Noise Stimuli in a Cetartiodactyl Dana L.Adcock1, Douglas P.Nowacek2, Brandon L.Southall3, Susan E.Parks1. 1Syracuse University, Syracuse, NY, USA.2Duke University Marine Lab, Beaufort, NC, USA.3Southall Environmental Associates, Aptos, CA, USA |
Abstract
Impacts of auditory intensity dynamics, such as looming, are understudied in nonhuman species. The behavioral responses of 23 fin whales(Balaenoptera physalus, order Cetartiodactyla) carrying archival tags to close approaching and receding vessels were assessed. Kinematic parameters were used to examine event-based movement outliers above baseline thresholds(standardized Mahalanobis Distance). Five behavioral states were identified(feeding,exploratory foraging,rest,travel,unknown) over 30 s intervals. The tags recorded 40 approach and passage by vessels on 13 fin whales(12M,1F). Movement outliers were detected during 11 exposures on 5 individuals. The probability of these outliers occurring increased with a more rapid increase in received level(RL) between 30s bins(GEE,p< 0.01), particularly in low and intermediate absolute RLs. The whales significantly decreased travel(-18%) and increased rest behavior(+30%) during the approach phase of the vessel compared to baseline(GEE,p< 0.05), but not during vessel recession. These results demonstrate event- and state-based behavioral responses to looming acoustic stimuli in a Cetartiodactyl, only reported previously in primates and rodents.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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