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    Light stimulates swimming behavior of larval eastern oysters Crassostrea virginica in turbulent flow

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    Author's manuscript, includes supplemental material (1.182Mb)
    Date
    2017-05
    Author
    Wheeler, Jeanette D.  Concept link
    Luo, Elaine  Concept link
    Helfrich, Karl R.  Concept link
    Anderson, Erik J.  Concept link
    Starczak, Victoria R.  Concept link
    Mullineaux, Lauren S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9055
    As published
    https://doi.org/10.3354/meps12106
    Keyword
     Larval invertebrate ecology; Larval swimming; Environmental cues; Hydrodynamics 
    Abstract
    Planktonic larvae of the eastern oyster Crassostrea virginica are able to regulate their vertical position in the water, but the environmental cues responsible for this regulation, particularly in turbulent settings, remain unclear. We quantified swimming responses of late-stage oyster larvae in a grid-stirred turbulence tank to determine how light affects the swimming behavior of larvae over a range of hydrodynamic conditions similar to their natural coastal environments. We used particle image velocimetry and larval tracking to isolate larval swimming from local flow and to quantify 3 behavioral metrics: vertical swimming direction, proportion of larvae diving, and proportion of larvae swimming helically. We compared these metrics across turbulence levels ranging from still water (ε = 0 cm2 s-3) to estuarine-like conditions (ε = 0.4 cm2 s-3) in light and dark. At all turbulence levels, light had no effect on the proportion of upward swimming larvae, but elicited detectable increases in the proportion of helical swimming and diving behaviors. We further examined the effect of light and turbulence on specific characteristics of helical trajectories, and found that these environmental cues induce changes to both vertical and horizontal velocities of helically swimming larvae, changing the helix geometry. The increased prevalence of these behaviors in light likely plays an ecological role: increased diving in light (in conjunction with turbulence) is a potential mechanism to enhance settlement success, while changes to helical swimming in light may serve an anti-predatory function. Together, these behaviors provide insight into potentially complex larval responses to multiple simultaneous environmental cues.
    Description
    Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 571 (2017): 109-120, doi:10.3354/meps12106.
    Collections
    • Physical Oceanography (PO)
    • Applied Ocean Physics and Engineering (AOP&E)
    • Biology
    Suggested Citation
    Preprint: Wheeler, Jeanette D., Luo, Elaine, Helfrich, Karl R., Anderson, Erik J., Starczak, Victoria R., Mullineaux, Lauren S., "Light stimulates swimming behavior of larval eastern oysters Crassostrea virginica in turbulent flow", 2017-05, https://doi.org/10.3354/meps12106, https://hdl.handle.net/1912/9055
     

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