[MARMAM] New Publication: Effects of a scientific echo sounder on the behavior of short-finned pilot whales (Globicephala macrorhynchus)
Nicola Quick, Ph.D.
nicola.quick at duke.edu
Tue Oct 25 14:40:08 PDT 2016
We are pleased to announce the online publication of our article in Canadian Journal of Fisheries and Aquatic Sciences
Quick, N., Scott-Hayward, L., Sadykova, D, Nowacek, D. and Read, A. 2016. Effects of a scientific echo sounder on the behavior of short-finned pilot whales (Globicephala macrorhynchus). 10.1139/cjfas-2016-0293
Active echo sounding devices are often employed for commercial or scientific purposes in the foraging habitats of marine mammals. We conducted an experiment off Cape Hatteras, North Carolina, USA to assess whether the behavior of short-finned pilot whales changed when exposed to an EK60 scientific echo sounder. We attached digital acoustic recording tags (DTAGs) to nine individuals, five of which were exposed. A hidden Markov model (HMM) to characterize diving states with and without exposure provided no evidence for a change in foraging behavior. However, Generalized Estimating Equations (GEE's), to model changes in heading variance over the entire tag record, under all experimental conditions, showed a consistent increase in heading variance during exposure, over all values of depth and pitch. This suggests that, regardless of behavioral state, the whales changed their heading more frequently when the echo sounder was active. This response could represent increased vigilance in which whales maintained awareness of echo sounder location by increasing their heading variance, and provides the first quantitative analysis on reactions of cetaceans to a scientific echo sounder.
You can access the article here http://www.nrcresearchpress.com/doi/10.1139/cjfas-2016-0293#.V_P7r_krL0M
Or send any enquires directly to me at njq at duke.edu<mailto:njq at duke.edu>
Dr Nicola J. Quick
Nicholas School of the Environment
Duke Marine Lab
135 Duke Marine Lab Road
njq at duke.edu<mailto:njq at duke.edu>
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