Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Transitions in morphologies, fluid regimes, and feeding mechanisms during development of the medusa Lychnorhiza lucerna

Full text
Nagata, Renato M. ; Morandini, Andre C. ; Colin, Sean P. ; Migotto, Alvaro E. ; Costello, John H.
Total Authors: 5
Document type: Journal article
Source: Marine Ecology Progress Series; v. 557, p. 145-159, SEP 28 2016.
Web of Science Citations: 6

The early ontogeny of scyphomedusae involves morphological and functional transitions in body plans that affect the predators' propulsive and feeding strategies. We applied highspeed videography, digital particle image velocimetry (DPIV), and dye visualization techniques to evaluate alterations in swimming and feeding mechanisms during ontogeny of the rhizostome medusa Lychnorhiza lucerna Haeckel, 1880 (Scyphozoa, Rhizostomeae). During early ontogeny, the ephyral mouth lips develop into complex filtering structures along the oral arms. The viscous environments (Reynolds number <100) experienced by ephyrae constrain the feeding mechanisms that transport fluid during ephyral bell pulsations. In contrast, adult medusan fluid flows are dominated by inertial forces, and bell pulsations effectively transport fluids and entrained prey toward the oral arms. The oral arm surfaces are covered by motile epidermal cilia that drive these entrained flows through filtering gaps in the oral arms where food particles are retained. In addition to this process within the oral arms, vortices generated during bell pulsation flow downstream along the outside of the medusae and continuously transport prey toward the exterior oral arm surfaces. Although calanoid copepods are capable of escape velocities that greatly exceed L. lucerna's feeding current speeds, copepods often fail to detect the predator's feeding currents or inadvertently jump into medusan capture surfaces during failed escape attempts. Consequently, the comparatively weak predator feeding currents successfully capture a portion of the copepods encountered by swimming medusae. These results clarify the processes that enable rhizostome medusae to play key roles as consumers in tropical and subtropical coastal environments. (AU)

FAPESP's process: 14/00824-6 - Animal-fluid interactions in medusae from Brazilian Coast: biomechanical solutions and ecological consequences
Grantee:André Carrara Morandini
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 11/00436-8 - Morphofunctional bases of feeding and the trophic role of Lychnorhiza lucerna (Scyphozoa, Rhizostomeae)
Grantee:Renato Mitsuo Nagata
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 16/05637-5 - Morpho-functional diversity in scyphozoan medusae: new data for species cultivated in Japanese institutes
Grantee:Renato Mitsuo Nagata
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 11/50242-5 - Dimensions of marine life: patterns and process of diversifications in planktonic and benthic cnidarians
Grantee:Antonio Carlos Marques
Support type: BIOTA-FAPESP Program - Thematic Grants
FAPESP's process: 13/19478-8 - Implications of animalfluid interactions for the feeding behavior of Lychnorhiza lucerna
Grantee:Renato Mitsuo Nagata
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 15/01307-8 - Morpho-functional diversity in scyphozoan medusae: an analysis of the locomotory-feeding integrated system
Grantee:Renato Mitsuo Nagata
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 10/50174-7 - Systematics, life cycle and reproductive patterns of jellyfishes (Cnidaria: Medusozoa: Cubozoa and Scyphozoa) in the Baixada Santista (São Paulo, Brazil)
Grantee:André Carrara Morandini
Support type: BIOTA-FAPESP Program - Regular Research Grants