Life cycle of the jellyfish Lychnorhiza lucerna (Scyphozoa: Rhizostomeae)

Schiariti, Agustín; Kawahara, Masato; Uye, Shin-ichi; Mianzán, Hermes

doi:10.1007/s00227-008-1050-8

Cited by 61 publications

(54 citation statements)

References 37 publications

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“…In contrast, rhizostome Dactyliophorae usually have short stalks and mainly reproduce by encysted tissues developing at the polyp base (podocysts) and polydisc strobilation (Holst et al 2007;Schiariti et al 2008). Strobilations with two simultaneously developing ephyrae are exceptional in Kolpophorae but were previously described for C. andromeda in \5 % of strobilae (Gohar and Eisawy 1960).…”

Section: Asexual Reproductionmentioning

confidence: 91%

Revised descriptions of the nematocysts and the asexual reproduction modes of the scyphozoan jellyfish Cassiopea andromeda (Forskål, 1775)

2015

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Our investigations on different developmental stages of the jellyfish Cassiopea andromeda (Forskål, 1775) provide updated descriptions of nematocyst types and asexual reproduction modes, which were documented by drawings and high-resolution photographs. In contrast to previous studies that only described three types of nematocysts, we revealed five types: a-isorhizas, O-isorhizas, euryteles, large oval birhopaloids, and small lemon-shaped birhopaloids. Comparisons of undischarged and discharged capsules revealed significantly smaller capsule volumes (48-51 %) in the latter. We provide capsule lengths and widths ranges for each capsule type (undischarged) and developmental stage. We demonstrate that for most capsule types the calculated capsule volumes were positively correlated with the progressing development and increasing size of the five developmental stages, namely bud, polyp, strobila, ephyra, and medusa. O-isorhizas were only present in the latter three stages probably due to a change in diet related to a changing life style. Besides asexual reproduction by swimming buds and monodisc strobilation common in rhizostome Kolpophorae, we documented lateral polyp budding for the first time in this taxon. Our results demonstrate that cultivating living specimens facilitate detailed descriptions of nematocysts and reproductive modes in metagenetic cnidarians, which cannot be achieved by studies on preserved material.

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Section: Asexual Reproductionmentioning

confidence: 91%

Revised descriptions of the nematocysts and the asexual reproduction modes of the scyphozoan jellyfish Cassiopea andromeda (Forskål, 1775)

2015

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“…Settlement of planulae at the water-air interface also has been observed in other scyphozoan species like Lychnorhiza lucerna Haeckel (Schiriati et al, 2008) and Aurelia aurita Linnaeus , and probably is an artefact related to the motionless water within laboratory containers. Although Kroiher & Berking (1999) suggested that planula settlement on the water surface is normal in natural conditions, evidence is missing for C. tuberculata given that few polyps have been observed in situ (only three polyps).…”

Section: Benthic Stagementioning

confidence: 92%

Ecological aspects of early life stages of Cotylorhiza tuberculata (Scyphozoa: Rhizostomae) affecting its pelagic population success

2012

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Cotylorhiza tuberculata is a common symbiotic scyphozoan in the Mediterranean Sea. The medusae occur in extremely high abundances in enclosed coastal areas in the Mediterranean Sea. Previous laboratory experiments identified thermal control on its early life stages as the driver of medusa blooms. In the present study, new ecological aspects were tested in laboratory experiments that support the pelagic population success of this zooxanthellate jellyfish. We hypothesized that planulae larvae would have no settlement preference among substrates and that temperature would affect ephyra development, ingestion rates and daily ration. The polyp budding rate and the onset of symbiosis with zooxanthellae also were investigated. Transmission electron microscopy revealed that zooxanthella infection occurred by the polyp stage. Our results showing no substrate selectivity by planulae and high polyp budding rates in high temperatures suggest increased benthic polyp populations, which would lead to higher medusa abundances. Rates of transition from ephyrae to medusae and the feeding of early medusa stages also increased with temperature. Continuing changes in coastal ecosystems such as future climate warming and marine construction may lead to increased populations of jellyfish to the detriment of fish globally.

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“…A decrease in the biomass of commercial fi sh species in association with an increase in jellyfi sh populations has also been observed elsewhere in the world (Lynam et al 2005(Lynam et al , 2006Dong et al 2010 ) but estimates of economic losses are not available. Jellyfi sh have been reported to interfere with fi shing operations in a number of ways, including reduction in fi sh catches, clogging and bursting nets, requiring more labour to remove jellyfi sh from nets, increasing fi sh mortality due to nematocyst venom, causing painful stings to fi shermen, displacing hauls to areas more distant from landing ports, and preventing fi shermen from operating (Purcell et al 2007 and references therein, Schiariti et al 2008 ;Uye 2008 ;Nagata et al 2009 ;Dong et al 2010 ;Quiñones et al 2013 ;Palmieri et al 2014 ). In 2000 outbreaks of the alien Phyllorhiza punctata may have caused losses of up to USD 12 million 1 to the shrimp fi shery of the northern Gulf of Mexico because of fouled fi shing gear and harvest (Graham et al 2003 ).…”

Section: Impacts Of Jellyfi Sh Blooms On the Provision Of Ecosystem Smentioning

confidence: 99%

Jellyfish Blooms and Their Impacts on Welfare Benefits: Recreation in the UK and Fisheries in Italy

Palmieri

Schaafsma

Luisetti

et al. 2015

Studies in Ecological Economics

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Life cycle of the jellyfish Lychnorhiza lucerna (Scyphozoa: Rhizostomeae)

Cited by 61 publications

References 37 publications

Revised descriptions of the nematocysts and the asexual reproduction modes of the scyphozoan jellyfish Cassiopea andromeda (Forskål, 1775)

Revised descriptions of the nematocysts and the asexual reproduction modes of the scyphozoan jellyfish Cassiopea andromeda (Forskål, 1775)

Ecological aspects of early life stages of Cotylorhiza tuberculata (Scyphozoa: Rhizostomae) affecting its pelagic population success

Jellyfish Blooms and Their Impacts on Welfare Benefits: Recreation in the UK and Fisheries in Italy

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