High genetic differentiation in the edible cannonball jellyfish (cnidaria: Scyphozoa: Stomolophus spp.) from the Gulf of California, Mexico

Mamet, Leandro Nicolás Getino; Daglio, Liza Gómez; León, Francisco J. Garcı́a de

doi:10.1016/j.fishres.2019.105328

Cited by 17 publications

(2 citation statements)

References 69 publications

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“…The medusa form of the different rhizostome species possesses multiple mouths as pores distributed along their eight fused oral arms [ 2 ], and can be observed in abundance along the coasts of every continent [ 3 , 4 , 5 , 6 , 7 ]. While they have long been understudied from an ecological perspective, they include high impact [ 8 ] commercially harvested species [ 9 , 10 , 11 ], and are common in many areas with substantial ecotourism [ 12 ]. While public health authorities advise swimmers to stay away from jellyfish of all kinds, this is often under the supposition that harm from envenomation will arise from physically touching medusae, or more specifically, touching the tentacles or tentacle-like appendages that contain a high density of stinging cell capsules, called nematocysts.…”

Section: Introductionmentioning

confidence: 99%

Raising Awareness of the Severity of “Contactless Stings” by Cassiopea Jellyfish and Kin

Muffett

Klompen

Collins

et al. 2021

Animals

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Discussion around avoidance and mitigation of jellyfish stings has traditionally focused on swimmers and divers being mindful of their behavior relative to swimming medusae (pelagic jellyfish). This framework must be restructured with the inclusion of the oblique risk posed by novel autonomous stinging structures like cassiosomes from Cassiopea (a jellyfish genus of the taxonomic order Rhizostomeae). Cassiosomes are released by Cassiopea sp. into subtropical waters that can consequently sting human skin, causing varying degrees of pain and irritation; this trait extends to other rhizostome jellyfish species. Swimmers and waders may put themselves at risk simply by coming into contact with agitated water in the vicinity of Cassiopea medusae, even without touching any part of the jellyfish (medusa, tentacles, or otherwise). Herein, we highlight details provided by 46 researchers and professional aquarists reporting incidents in which they experienced “stinging water” sensations, which we also refer to as “contactless stings’’. We report these findings in order to increase the awareness of a public safety hazard the community may be unaware of in their own labs, aquariums, and sampling locations.

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Section: Introductionmentioning

confidence: 99%

Raising Awareness of the Severity of “Contactless Stings” by Cassiopea Jellyfish and Kin

Muffett

Klompen

Collins

et al. 2021

Animals

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“…However, recent studies in Stomolopus genus from the Gulf of California have classified the cannonball as Stomolophus sp. 2 (Getino Mamet, Gómez Daglio & García-De León, 2019;Gómez Daglio & Dawson, 2017). The cannonball jellyfish are found in waters with an average temperature of 23.1 • C (74 • F) and in salinities from 17.7-36.5 parts per thousand (ppt) with an average of 33.8 ppt.…”

Section: Introductionmentioning

confidence: 99%

Cannonball jellyfish digestion: an insight into the lipolytic enzymes of the digestive system

Martínez-Pérez

Rodríguez

Soto

et al. 2020

PeerJ

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The digestive system and metabolism of the cannonball jellyfish Stomolophus sp. 2 are not well-known. The digestion study was critical to explain its ecology and bloom success. Different enzymes are involved in food digestion, which hydrolyze carbohydrates, proteins, and lipids. This study detected lipolytic activity in enzymatic extracts from gastric pouches of Stomolophus sp. 2 collected in the summer of 2013 at Bahía de Kino, Sonora, México (28°47′47″N 111°57′25″W). Lipase/esterase activity showed optimal pH at 11.0 and 50–60 °C with a half-life (t1/2) of 33 min at 55 °C, whereas halotolerance of this activity was recorded from 0-4 M NaCl. Metal ions Ca2+ and Mn2+ did not affect the activity, but Mg2+ decreased it 14.2% ± 3.15, while chelating agents as ethylenediaminetetraacetic acid reduced the activity 8.55% ± 2.13. Inhibition of lipase/esterase activity with tetrahydrolipstatin and paraoxon-ethyl decreased the activity 18.2% ± 2.3, and 62.80% ± 0.74, respectively, whereas phenylmethanesulfonyl fluoride (a protease inhibitor) did not affect it. The enzyme displayed a higher specificity for short-chain triglycerides, but triolein, coconut oil, olive oil, and fish oil were hydrolyzed. For the first time, phospholipase activity from the gastric pouch of Stomolophus sp. 2 was detected using L-α-phosphatidylethanolamine from chicken egg yolk as a substrate. These results suggest that Stomolophus sp. 2 hydrolyze several kinds of lipids, and lipolytic enzymes are active at alkaline pH under different saline conditions, which may be essential to digest different preys.

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Variability of growth rates and thermohaline niches of Rhizostoma pulmo’s pelagic stages (Cnidaria: Scyphozoa)

et al. 2021

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In recent decades, an increase in the abundance and frequency of bloom events has been reported for the scyphozoan Rhizostoma pulmo in the Mediterranean Sea. Understanding such events requires a thorough assessment of the species' population dynamics through environmental windows allowing species development. The semi-enclosed coastal lagoon of Bages Sigean, France (43 degrees 05 ' 12.72 '' N; 3 degrees 00 ' 35.3 '' E) offers an exceptional framework for investigating the population dynamics of the species, and how its growth rates and environmental niches vary over time. Three cohorts starting in April, May and June 2019 were identified, while the overall population growth reached the maximum biomass (10.2 g m(-3)) in July. Bell diameter and total length were identified as the best morphological proxies of biomass estimation. The abundances of the two most abundant copepods' species appear to drive R. pulmo's dynamics in the lagoon. Based on multinomial analysis and using the von Bertalanffy model, different growth rates for juveniles (4.7 and 2.4 mm day(-1)) and adults (1.8 and 0.9 mm day(-1)) were determined for the first two cohorts. Thermohaline niches varied during ontogeny, but also among populations in three coastal Mediterranean lagoons: Bages Sigean (France), Mar Menor (Spain) and Bizerte (Tunisia), shedding light on the metapopulation dynamics of R. pulmo inhabiting the Mediterranean Sea. The pressing need for understanding the dynamics of jellyfish abundances and their impacts on ecosystems, calls for increased efforts on monitoring these populations and their life history traits to parametrize and build reliable ecosystem models.

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High genetic differentiation in the edible cannonball jellyfish (cnidaria: Scyphozoa: Stomolophus spp.) from the Gulf of California, Mexico

Cited by 17 publications

References 69 publications

Raising Awareness of the Severity of “Contactless Stings” by Cassiopea Jellyfish and Kin

Raising Awareness of the Severity of “Contactless Stings” by Cassiopea Jellyfish and Kin

Cannonball jellyfish digestion: an insight into the lipolytic enzymes of the digestive system

Variability of growth rates and thermohaline niches of Rhizostoma pulmo’s pelagic stages (Cnidaria: Scyphozoa)

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