Patterns of morphological development in Scyphozoa ephyrae (Cnidaria, Medusozoa)

Jordano, Mayara de A.; Miyake, Hiroshi; Nagata, Renato Mitsuo; Morandini, André C.

doi:10.1007/s12526-022-01269-1

Cited by 6 publications

(12 citation statements)

References 39 publications

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“…The observed earlier transition by rhizostome to the inertial uid regime corresponds to an earlier metamorphose of rhizostome ephyrae than "semaeostomes" 14 . Jordano et al (2022) showed that many rhizostomes lled in the space between their ephyrae lappets to make a continuous bell at a smaller size.…”

Section: Discussionmentioning

confidence: 86%

“…Despite the similarities in ephyra body plans, morphological and functional variations emerge through early ontogeny (e.g. 14 ) and such transitions also affect swimming and feeding behaviour 9 . Ephyrae swimming is characterized as a drag-based paddling 17 , a common strategy for animals performing in low Reynolds number uids 34 .…”

Section: Discussionmentioning

confidence: 99%

“…The initial medusa stage of Scyphozoa, the ephyrae, are morphologically similar among the different lineages within the class 13,14 . Ephyrae are only a few millimetres in size, whereas juveniles and adults are usually larger in diameter (> 2cm), reaching over a meter in species of the genera Cyanea Péron & Lesueur, 1810 and Nemopilema Kishinouye, 1922.…”

Section: Introductionmentioning

confidence: 95%

“…Ephyrae are only a few millimetres in size, whereas juveniles and adults are usually larger in diameter (> 2cm), reaching over a meter in species of the genera Cyanea Péron & Lesueur, 1810 and Nemopilema Kishinouye, 1922. During early development (4 to ~ 20 mm), the ephyra lacks specialized feeding structures (tentacles and oral arms) and their umbrella is clefted, with 8 marginal lobes 14 . Ephyrae pulse more frequently (> 3 Hz) than adult medusae 9,[15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

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Ontogenetic Transitions, Biomechanical Trade-Offs and Macroevolution of Scyphozoan Medusae Swimming Patterns

Montfort

Costello

Colin

et al. 2022

Preprint

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Ephyrae, the early stages of scyphozoan jellyfish, possess a conserved morphology among species. However, ontogenetic transitions lead to morphologically different shapes among scyphozoan lineages, with important consequences for swimming biomechanics, bioenergetics and ecology. We used high-speed imaging to analyse biomechanical and kinematic variables of swimming in 17 species of Scyphozoa (1 Coronatae, 8 “Semaeostomeae” and 8 Rhizostomeae) at different developmental stages. Swimming kinematics of early ephyrae were similar, in general, but differences related to major lineages emerged through development. Rhizostomeae medusae have more prolate bells, shorter pulse cycles and higher swimming performances. Medusae of “Semaeostomeae”, in turn, have more variable bell shapes and most species had lower swimming performances. Despite these differences, both groups travelled the same distance per pulse suggesting that each pulse is hydrodynamically similar. Therefore, higher swimming velocities are achieved in species with higher pulsation frequencies. Our results suggest that medusae of Rhizostomeae and “Semaeostomeae” have evolved bell kinematics with different optimized traits, rhizostomes optimize rapid fluid processing, through faster pulsations, while “semaeostomes” optimize swimming efficiency, through longer interpulse intervals that enhance mechanisms of passive energy recapture.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ontogenetic Transitions, Biomechanical Trade-Offs and Macroevolution of Scyphozoan Medusae Swimming Patterns

Montfort

Costello

Colin

et al. 2022

Preprint

Self Cite

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“…Externally, rhopalia were visible along the bell margin, and the first oral arm bifurcation and groves were clearly visible. Individual arms showed signs of vesicles forming apically, while digitata were not yet present (e.g., Jordano et al, 2022; Muffett et al, 2022) (Figure 1a). The bell-disk surface is not perfectly flat, but appears ridged in a radial pattern, possibly due to the musculature lining the subumbrella epidermis (Blanquet and Riordan, 1981).…”

Section: Resultsmentioning

confidence: 99%

Non-invasive investigation of the morphology and optical properties of the upside-down jellyfishCassiopeawith optical coherence tomography

Lyndby

Murthy

Bessette

et al. 2023

Preprint

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The jellyfishCassiopealargely cover their organic carbon demand via photosynthates produced by their microalgal endosymbionts, but how holobiont morphology and optical properties affect the light microclimate and symbiont photosynthesis inCassiopearemain unexplored. Here, we use optical coherence tomography (OCT) to study the morphology of liveCassiopeamedusae at high spatial resolution. We include detailed 3D reconstructions of external micromorphology, and show the spatial distribution of endosymbionts clustered in amoebocytes and white granules in the bell tissue. Furthermore, we use OCT data to extract inherent optical properties from light scattering white granules inCassiopeaand show that white granules enhance local light availability for symbionts in close proximity. Individual granules had a scattering coefficient of μs= 200-300 cm-1, and a scattering anisotropy factor ofg= 0.7, while large tissue regions filled with white granules had a lower μs= 40-100 cm-1, andg= 0.8-0.9. We combined OCT information with an isotopic labelling experiment to investigate the effect of enhanced light availability in whitish tissue regions. Algal symbionts located in whitish tissue exhibited significantly higher carbon fixation as compared to symbionts in anastomosing tissue (i.e., tissue without light scattering white granules). Our findings support previous suggestions that white granules inCassiopeaplay an important role in the host modulation of the light-microenvironment.

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Ecology of Rhizostomeae

Thibault,

Kuplik,

Prieto

et al. 2024

Advances in Marine Biology

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Patterns of morphological development in Scyphozoa ephyrae (Cnidaria, Medusozoa)

Cited by 6 publications

References 39 publications

Ontogenetic Transitions, Biomechanical Trade-Offs and Macroevolution of Scyphozoan Medusae Swimming Patterns

Ontogenetic Transitions, Biomechanical Trade-Offs and Macroevolution of Scyphozoan Medusae Swimming Patterns

Non-invasive investigation of the morphology and optical properties of the upside-down jellyfishCassiopeawith optical coherence tomography

Ecology of Rhizostomeae

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