FN Archimer Export Format
PT J
TI Passive acoustics suggest two different feeding mechanisms in the Atlantic walrus (Odobenus rosmarus rosmarus)
BT 
AF Jézéquel, Youenn
   Mathias, Delphine
   Olivier, Frédéric
   Amice, Erwan
   Chauvaud, Sylvain
   Jolivet, Aurélie
   Bonnel, Julien
   Sejr, Mikael K.
   Chauvaud, Laurent
AS 1:1;2:2;3:3;4:4;5:5;6:5;7:6;8:7;9:4;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA
   SOMME, Société d’Observation Multi-Modale de L’Environnement, 2 rue de Suède. Bloc 03, 56400, Auray, France
   Biologie des Organismes et Écosystèmes Aquatiques (BOREA), UMR 7208, MNHN/SUUNICAEN/UACNRS/IRD, 61 Rue Buffon CP 53, 75005, Paris, France
   Laboratoire des Sciences de L’Environnement Marin (LEMAR), UMR 6539 UBO, CNRS, IRD/Ifremer, Rue Dumont D’Urville, 29280, Plouzané, France
   TBM Environnement, Porte Océane Bloc 03, 2 rue de Suède, 56400, Auray, France
   Applied Ocean Physics & Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA, 02540, USA
   Arctic Research Centre, Department of EcoScience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark
C2 WHOI, USA
   SOMME, FRANCE
   MNHN, FRANCE
   CNRS, FRANCE
   TBM ENVIRONNEMENT, FRANCE
   WHOI, USA
   UNIV AARHUS, DENMARK
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-int-hors-europe
IF 1.7
TC 1
UR https://archimer.ifremer.fr/doc/00777/88935/97549.pdf
LA English
DT Article
DE ;Bioacoustics;Bivalves;Feeding behavior;Marine mammal;Young Sound fjord
AB The vocal repertoire of walruses has been widely described in the bioacoustic literature. These marine mammals produce several distinct types of vocalizations for intraspecific communication during the breeding season. In this study, we provide the first evidence of walrus-generated sounds during foraging dives when they feed on bivalves. We recorded two types of sounds that we associated to different feeding mechanisms. The first sound type was brief and low in frequency that we relate to the suction of soft parts from the bivalves’ shells through the use of walrus powerful tongues, which is the common feeding behavior reported in the walrus literature. We also recorded a second sound type composed of multiple broadband pulse trains. We hypothesize the latter were associated with bivalve shell cracking by walruses, which would represent a new feeding mechanism in the walrus literature. This new feeding mechanism is either related to bivalves’ ecology or to walruses removing the sediment when searching for food. During this study, we observed bivalves lying on the seafloor instead of being buried in the sediment in walrus feeding areas while scuba diving. As a result, walruses cannot use suction to feed on soft body part of bivalves and have to use another strategy, mastication. Our findings provide a first step towards using passive acoustics to quantify walrus behavior and feeding ecology. 
PY 2022
PD JUL
SO Polar Biology
SN 0722-4060
PU Springer Science and Business Media LLC
VL 45
IS 6
UT 000814033700001
BP 1157
EP 1162
DI 10.1007/s00300-022-03055-y
ID 88935
ER

EF