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How about that extension?: Biomechanical roles of spines in crustacean nauplii

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dc.contributor.advisor Chan, Kit Yu Karen
dc.contributor.author Branam, Emily Nicole
dc.date.accessioned 2021-06-08T20:25:23Z
dc.date.available 2021-06-08T20:25:23Z
dc.date.issued 2021
dc.identifier.uri http://hdl.handle.net/10066/23028
dc.description.abstract Marine plankton possess elongated body structures, such as spines and horns, that increase drag on the body. While these extensions are often considered an anti-predation mechanism, the biomechanical implications of these structures are less studied. Using the barnacle nauplii Octolasmis spp., I explore the role of one such body extension, the dorsal thoracic spine, through amputation. Motion analysis revealed slower swimming and more erratic trajectories in dorsal thoracic spine amputees than those in control. Limb kinematic adjustments such as a larger beat amplitude, increased phase lag, and reduced contralateral symmetry were observed in amputees. While these changes may act to partially compensate for the loss of the spine by increasing propulsion and streamlining flow, they were unable to fully restore swimming proficiency. Further Particle Image Velocimetry (PIV) on live nauplii revealed increased predation risk by rheotactic predators as well as reduced feeding in amputees due to increased relative area of influence and decreased flux. A dynamically scaled model of spine loss supported area of influence results observed in live nauplii. The interaction between body extensions and limb motion shape swimming performance in nauplii, and in turn, shapes the evolution of naupliar form. en_US
dc.description.sponsorship Swarthmore College. Dept. of Biology en_US
dc.language.iso en en_US
dc.rights Full copyright to this work is retained by the student author. It may only be used for non-commercial, research, and educational purposes. All other uses are restricted.
dc.title How about that extension?: Biomechanical roles of spines in crustacean nauplii en_US
dc.rights.access No restrictions en_US


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