@article {9216, title = {Impact of anthropogenic sounds (pile driving, drilling and vessels) on the development of model species involved in marine biofoulingTable_1.docx}, journal = {Frontiers in Marine Science}, volume = {10}, year = {2023}, month = {May-05-2023}, pages = {1111505}, abstract = {The uncontrolled colonization of benthic organisms on submerged surfaces, also called biofouling, causes severe damage in the shipping and aquaculture industries. Biofouling starts with a benthic biofilm composed of a complex assemblage of microbes, bacteria and benthic diatoms, calledmicrofouling, on whichmacrofouling invertebrate species settle and grow. Invertebrate larvae may use natural soundscapes to orientate inshore and choose their optimal habitat. Recent studies have demonstrated that ship sounds enhance the larval settlement and growth of several invertebrate species, such as mussels, associated with biofouling. Among invertebrates, effects of sound generated by offshore human activities are still poorly studied. This study aims to assess the effect of pile driving, drilling and vessel sounds on model species associated with micro and macrofouling. First, the biofilm development of Navicula pelliculosa and Amphora coffeaeformis was assessed, then, the larval development of the blue mussel (Mytilus edulis) was evaluated from the D-veliger to the postlarval stage. Mussel larvae and microalgae were exposed 12 h each day in tanks (Larvosonic) adapted to sound experiments under controlled conditions. All anthropogenic sounds induced a thinner N. pelliculosa biofilm coupled with a lower microalgae concentration. The drilling sound had a stronger effect on the biofilm thickness. The drilling sound significantly reduced the pediveliger settlement and the postlarvae clearance rate by 70.4\% and tended to diminish settler sizes compared to control sound. Contrary to our expectation, pile driving tended to enhance larval recruitment by 22\% (P=0.077) and the boat sound did not stimulate larval settlements or recruitment. Drilling sound generated a stressful acoustic environment for pediveliger settlements and postlarvae seem to maintain their shell valves closed to preserve energy. We identify potential causes andmechanisms involved in these impacts of anthropophony on larval ecology and microfouling dynamics.}, keywords = {anthropogenic sounds, Benthic diatoms, Bioacoustics, Biofouling, larval development, settlement}, doi = {10.3389/fmars.2023.111150510.3389/fmars.2023.1111505.s001}, url = {https://www.frontiersin.org/articles/10.3389/fmars.2023.1111505/full}, author = {Cervello, Gauthier and Olivier, Fr{\'e}d{\'e}ric and Chauvaud, Laurent and Winkler, Gesche and Mathias, Delphine and Juanes, Francis and Tremblay, Rejean} } @article {8739, title = {Passive acoustics suggest two different feeding mechanisms in the Atlantic walrus (Odobenus rosmarus rosmarus)}, journal = {Polar Biology}, year = {2022}, month = {Sep-06-2023}, abstract = {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{\textquoteright} 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{\textquoteright} 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.}, keywords = {Bioacoustics, bivalves, Feeding Behavior, Marine mammal, Young Sound fjord}, issn = {0722-4060}, doi = {10.1007/s00300-022-03055-y}, url = {https://link.springer.com/10.1007/s00300-022-03055-y}, author = {J{\'e}z{\'e}quel, Youenn and Mathias, Delphine and Fr{\'e}d{\'e}ric Olivier and Amice, Erwan and Chauvaud, Sylvain and Jolivet, Aur{\'e}lie and Bonnel, Julien and Sejr, Mikael K. and Chauvaud, Laurent} }