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• W2051009545 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 488:171-185 (2013) - DOI: https://doi.org/10.3354/meps10382 Upward swimming of competent oyster larvae Crassostrea virginica persists in highly turbulent flow as detected by PIV flow subtraction J. D. Wheeler1,*, K. R. Helfrich2, E. J. Anderson3, B. McGann3, P. Staats4, A. E. Wargula5, K. Wilt6, L. S. Mullineaux1 1Department of Biology, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA 2Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA 3Department of Mechanical Engineering, Grove City College, Grove City, Pennysylvania 16127, USA 4Department of Electrical and Computer Engineering, Grove City College, Grove City, Pennysylvania 16127, USA 5Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA 6Division of Biology and Biomedical Sciences, Washington University in St. Louis, St. Louis, Missouri 63110, USA *Email: jdwhe@mit.edu ABSTRACT: Investigating settlement responses in the transitory period between planktonic and benthic stages of invertebrates helps shape our understanding of larval dispersal and supply, as well as early adult survival. Turbulence is a physical cue that has been shown to induce sinking and potentially settlement responses in mollusc larvae. In this study, we determined the effect of turbulence on vertical swimming velocity and diving responses in competent eastern oyster larvae Crassostrea virginica. We quantified the behavioural responses of larvae in a moving flow field by measuring and analyzing larval velocities in a relative framework (where local flow is subtracted away, isolating the behavioural component) in contrast to the more common absolute framework (in which behaviour and advection by the flow are conflated). We achieved this separation by simultaneously and separately tracking individuals and measuring the flow field around them using particle image velocimetry in a grid-stirred turbulence tank. Contrary to our expectations, larvae swam upward even in highly turbulent flow, and the dive response became less frequent. These observations suggest that oyster larvae are stronger swimmers than previously expected and provide evidence that turbulence alone may not always be a sufficient cue for settlement out of the water column. Furthermore, at a population level, absolute velocity distributions differed significantly from isolated larval swimming velocities, a result that held over increasing turbulence levels. The absolute velocity distributions indicated a strong downward swimming or sinking response at high turbulence levels, but this observation was in fact due to downwelling mean flows in the tank within the imaging area. Our results suggest that reliable characterization of larval behaviour in turbulent conditions requires the subtraction of local flow at an individual level, imposing the technical constraint of simultaneous flow and behavioural observations. KEY WORDS: Turbulence · Crassostrea virginica · Settlement · Larval behaviour · Particle image velocimetry Full text in pdf format PreviousNextCite this article as: Wheeler JD, Helfrich KR, Anderson EJ, McGann B and others (2013) Upward swimming of competent oyster larvae Crassostrea virginica persists in highly turbulent flow as detected by PIV flow subtraction. Mar Ecol Prog Ser 488:171-185. https://doi.org/10.3354/meps10382 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 488. Online publication date: August 15, 2013 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2013 Inter-Research." @default.
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• W2051009545 date "2013-08-15" @default.
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• W2051009545 title "Upward swimming of competent oyster larvae Crassostrea virginica persists in highly turbulent flow as detected by PIV flow subtraction" @default.
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• W2051009545 doi "https://doi.org/10.3354/meps10382" @default.
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