Sound detection by the American lobster (Homarus americanus)

Type Article
Date 2021-03
Language English
Author(s) Jezequel Youenn1, 2, Jones Ian T2, 3, Bonnel Julien4, Chauvaud Laurent1, Atema Jelle5, Mooney T. Aran3
Affiliation(s) 1 : Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539 CNRS, UBO, IRD, Ifremer, LIA BeBEST, Institut Universitaire Européen de la Mer (IUEM), rue Dumont D'Urville, 29280 Plouzané, France
2 : Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
3 : Massachusetts Institute of Technology-Woods Hole Oceanographic Institution Joint Program in Oceanography/Applied Ocean Science and Engineering, Cambridge, MA 02543, USA
4 : Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
5 : Boston University Marine Program, 5 Cummington Street, BRB 307, Boston, MA 02215, USA
Source Journal Of Experimental Biology (0022-0949) (The Company of Biologists), 2021-03 , Vol. 224 , N. 6 , P. jeb240747 (10p.)
DOI 10.1242/jeb.240747
WOS© Times Cited 14
Keyword(s) Marine invertebrate, Crustacean, Hearing, Auditory evoked potential, Acoustic communication

Although many crustaceans produce sounds, their hearing abilities and mechanisms are poorly understood, leaving uncertainties regarding whether or how these animals use sound for acoustic communication. Marine invertebrates lack gas-filled organs required for sound pressure detection, but some of them are known to be sensitive to particle motion. Here, we examined whether the American lobster (Homarus americanus) could detect sound and subsequently sought to discern the auditory mechanisms. Acoustic stimuli responses were measured using auditory evoked potential (AEP) methods. Neurophysiological responses were obtained from the brain using tone pips between 80 and 250 Hz, with best sensitivity at 80–120 Hz. There were no significant differences between the auditory thresholds of males and females. Repeated controls (recordings from deceased lobsters, moving electrodes away from the brain and reducing seawater temperature) indicated the evoked potentials' neuronal origin. In addition, AEP responses were similar before and after antennules (including statocysts) were ablated, demonstrating that the statocysts, a long-proposed auditory structure in crustaceans, are not the sensory organs responsible for lobster sound detection. However, AEPs could be eliminated (or highly reduced) after immobilizing hairfans, which cover much of lobster bodies. These results suggest that these external cuticular hairs are likely to be responsible for sound detection, and imply that hearing is mechanistically possible in a wider array of invertebrates than previously considered. Because the lobsters' hearing range encompasses the fundamental frequency of their buzzing sounds, it is likely that they use sound for intraspecific communication, broadening our understanding of the sensory ecology of this commercially vital species. The lobsters' low-frequency acoustic sensitivity also underscores clear concerns about the potential impacts of anthropogenic noise.

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