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Animal-fluid interactions in medusae from Brazilian Coast: biomechanical solutions and ecological consequences

Abstract

The visit of Prof. John Costello aims to record images of jellyfish with a high speed camera (Photron SA3 FastCam) at 1000 frames per second. Additionally, structural details of the organism will be recorded, with macro lenses of high magnification (105 mm), revealing its functional mechanics. The technique of the Digital Particle Image Velocimetry (DPIV), which measures the speed of the fluid around the animal will be applied to different species of jellyfish for comparative studies of morphologic and swimming patterns. This study is related to the theme project "Dimensions of marine life: patterns and processes of diversification in planktonic and benthic cnidarians" (FAPESP 2011/50242-5). The goal is to understand the role of morphological adaptations to produce propulsive patterns, maneuvers and energy efficiency in different lineages of Medusozoa. Tropical and subtropical jellyfish species, such as the hydromedusa Olindias sambaquiensis and the cubomedusa Chiropsalmus quadrumanus will be collected and species of distinct morphology, as scyphomedusae of the genera Aurelia , Chrysaora and Nausithoe will be reared in our laboratory. The DPIV will be applied in the jellyfish Lychnorhiza lucerna, the target species of the Ph.D. Student Renato Nagata (FAPESP 2011/00436-8) in individuals of different sizes (ephyrae and adults) for a complete study of the species swimming biomechanics. It is intended to describe the mechanics of prey capture by the jellyfish. By analyzing the interaction of swimming vortices with feeding structures on the oral arms we will better understand the coupling between swimming and feeding systems. Finally, the researcher will destine time for the attendance of students with projects in animals biomechanics, or related areas. The researcher will give at least two talks at the Institute (Biociências USP and CEBIMar USP). Moreover, the researcher will participate in scientific meetings to discuss future collaborative projects. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
NAGATA, RENATO M.; MORANDINI, ANDRE C.; COLIN, SEAN P.; MIGOTTO, ALVARO E.; COSTELLO, JOHN H. Transitions in morphologies, fluid regimes, and feeding mechanisms during development of the medusa Lychnorhiza lucerna. Marine Ecology Progress Series, v. 557, p. 145-159, SEP 28 2016. Web of Science Citations: 6.

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