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Morphology, swimming performance and propulsive mode of six co-occurring hydromedusae.
An examination of the wakes behind swimming medusae indicated that, in contrast to the clearly defined jet structures produced by prolate species, oblatemedusae did not produce defined jets but instead produced prominent vortices at the bell margins, which are consistent with a predominantly drag-based, rowing mode of propulsion by the oblate species. Expand
Flow patterns generated by oblate medusan jellyfish: field measurements and laboratory analyses
The lateral vortex motif discovered here appears to be critical to the dual function of the medusa bell as a flow source for feeding and propulsion and has a greater volume and closer spacing than predicted by prevailing models of medusan swimming. Expand
Seasonal refugia, shoreward thermal amplification, and metapopulation dynamics of the ctenophore Mnemiopsis leidyi in Narragansett Bay, Rhode Island
The lobate ctenophore Mnemiopsis leidyi occurs throughout Narragansett Bay, Rhode Island, during warm summer months but is often undetectable in the central portion of the bay during winter months.Expand
Transitions of Mnemiopsis leidyi (Ctenophora: Lobata) from a native to an exotic species: a review
The foundations of the ctenophore’s invasive success, which include the source-sink dynamics that characterize Mnemiopsis populations in temperate coastal waters, are reviewed, and the variables most likely to determine whether introduction of Mnemiops to a novel community results in an inconspicuous addition or a disruptive invasion are reviewed. Expand
Grazing in a turbulent environment: energy dissipation, encounter rates, and efficacy of feeding currents in Centropages hamatus.
Energetic calculations indicate a tradeoff in the value of turbulence to a copepod feeding on phytoplankton, while turbulence is probably beneficial at low food concentrations, it may be deleterious at high food concentrations. Expand
Passive energy recapture in jellyfish contributes to propulsive advantage over other metazoans
It is demonstrated, contrary to prevailing views, that the jellyfish (Aurelia aurita) is one of the most energetically efficient propulsors on the planet, exhibiting a cost of transport lower than other metazoans and reduced metabolic demand by passive energy recapture improves the cost of travel by 48%, allowing jellyfish to achieve the large sizes required for sufficient prey encounters. Expand
An algorithm to estimate unsteady and quasi-steady pressure fields from velocity field measurements
A method for estimating the pressure field corresponding to velocity field measurements such as those obtained by using particle image velocimetry is described and characterized, thereby eliminating the need for measurement interpolation during this step and significantly reducing the computational cost of the algorithm relative to previous approaches. Expand
Stealth predation and the predatory success of the invasive ctenophore Mnemiopsis leidyi
It is demonstrated that the predatory success of the lobate ctenophore Mnemiopsis leidyi lies in its use of cilia to generate a feeding current that continuously entrains large volumes of fluid, yet is virtually undetectable to its prey. Expand
Morphological diversity of medusan lineages constrained by animal–fluid interactions
It is demonstrated that constraints in available locomotor muscular force result in a trade-off between high-thrust swimming via jet propulsion and high-efficiency swimming via a combined jet-paddling propulsion, which is reflected in the morphological diversity of medusae. Expand
Swimming and feeding by the scyphomedusa Chrysaora quinquecirrha
Flow-field velocities, measured by tracking particles adjacent to the bell margin during contraction, increased with bell diameter, and the location of naupliar encounter was influenced by the phase of the pulsation cycle during which entrainment occurred. Expand