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    Hydrodynamic signal perception by the copepod Oithona plumifera

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    m373p037.pdf (1.383Mb)
    Date
    2008-12-23
    Author
    Jiang, Houshuo  Concept link
    Paffenhöfer, Gustav-Adolf  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5040
    As published
    https://doi.org/10.3354/meps07749
    DOI
    10.3354/meps07749
    Keyword
     Oithona plumifera; Ciliate; Predator–prey interaction; Hydrodynamic signal perception; Spatio-temporal pattern; Hydrodynamic modeling; Capture difficulty 
    Abstract
    Spatio-temporal hydrodynamic signal fields were quantified for ambush-feeding Oithona plumifera females sensing motile Strobilidium ciliates. First, videotaped Oithona–ciliate encounters were image-analyzed to retrieve ciliate trajectories, O. plumifera attack kinematics and reaction distances to the ciliates. Second, using computational fluid dynamics (CFD), flow disturbances created by swimming ciliates were examined for 5 common ciliary forcing schemes. Third, using the CFD results and measured ciliate trajectories as inputs, a hydrodynamic model was developed to calculate ciliate-generated hydrodynamic signal patterns for observed encounters. Wide variance was found in measured reaction distances. Good correlations existed between measured predator attack kinematics and measured pre-attack prey locations. Moreover, data analysis showed that O. plumifera preferred small attack angles, presumably to enhance capture success. From hydrodynamic modeling, several distinct spatio-temporal hydrodynamic signal patterns were identified, and estimated hydrodynamic signal strengths immediately prior to attack were all above a minimum required signal level but differed substantially in magnitude. These results support the notion that by monitoring and recognizing the spatio-temporal pattern of ciliate-created flow disturbances, O. plumifera can perceive and project the ciliate’s instantaneous location and velocity, and hence precisely time its attack when the ciliate reaches a location where it can most easily be captured. Instead of reacting to a constant signal strength, O. plumifera females adapt their capture behaviors to perceived signal patterns. CFD simulations also revealed species-specific flow patterns and spatial decays in hydrodynamic disturbances created by swimming protists. The predator may use this species-specific information to distinguish among prey species.
    Description
    Author Posting. © Inter-Research, 2008. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 373 (2008): 37-52, doi:10.3354/meps07749.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Marine Ecology Progress Series 373 (2008): 37-52
     

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