Directional flow sensing by passively stable larvae

The Journal of Experimental Biology
Heidi L FuchsF Javier Diez

Abstract

Mollusk larvae have a stable, velum-up orientation that may influence how they sense and react to hydrodynamic signals applied in different directions. Directional sensing abilities and responses could affect how a larva interacts with anisotropic fluid motions, including those in feeding currents and in boundary layers encountered during settlement. Oyster larvae (Crassostrea virginica) were exposed to simple shear in a Couette device and to solid-body rotation in a single rotating cylinder. Both devices were operated in two different orientations, one with the axis of rotation parallel to the gravity vector, and one with the axis perpendicular. Larvae and flow were observed simultaneously with near-infrared particle-image velocimetry, and behavior was quantified as a response to strain rate, vorticity and centripetal acceleration. Only flows rotating about a horizontal axis elicited the diving response observed previously for oyster larvae in turbulence. The results provide strong evidence that the turbulence-sensing mechanism relies on gravity-detecting organs (statocysts) rather than mechanosensors (cilia). Flow sensing with statocysts sets oyster larvae apart from zooplankters such as copepods and protists that use externa...Continue Reading

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Mar 20, 2015·The Journal of Experimental Biology·Heidi L FuchsF Javier Diez

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Citations

Oct 6, 2017·The Journal of Experimental Biology·Heidi L FuchsAdam J Christman
Dec 24, 2018·The Journal of Experimental Biology·Matthew C FernerBrian Gaylord
Dec 31, 2019·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Luis Alberto Bezares-CalderónGáspár Jékely
Jul 25, 2018·Proceedings of the National Academy of Sciences of the United States of America·Heidi L FuchsAdam J Christman
Dec 2, 2020·The Journal of Experimental Biology·Michelle H DiBenedettoLauren S Mullineaux
Jun 18, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kiryl AsheichykMatthias Krüger

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