Effects of low salinity on the physiological ecology of planulae and polyps of scyphozoans in the East Asian Marginal Seas: potential impacts of monsoon rainfall on medusa population size

Takao, Mariko; Uye, Shin-ichi

doi:10.1007/s10750-018-3558-3

Cited by 12 publications

(7 citation statements)

References 58 publications

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“…In our experiment, the euryhalinity and eurythermal characteristics of the planula stage of C. tagi were confirmed, as results demonstrated a low mortality rate and faster metamorphosis into polyps at higher temperatures. The euryhalinity exhibited by C. tagi planulae might also be retained by polyps, as the species-specific tolerance to low salinities was largely comparable for both planulae and polyps in several estuarine and brackish water scyphozoan species, including Chrysaora pacifica , N. nomurai , R. esculentum and Aurelia coerulea ( Holst & Jarms, 2010 ; Conley & Uye, 2015 ; Dong et al, 2015 ; Takao & Uye, 2018 ; Feng et al, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

“…Water was prepared by diluting artificial seawater (35‰) with distilled water. Each treatment was tested with eighteen replicates (planulae) following the methods of Conley & Uye (2015) and Takao & Uye (2018) . A total of thirty-six polycarbonate culture plates, six-wells of ten ml, were prepared (three plates per experimental condition).…”

Section: Methodsmentioning

confidence: 99%

“…Since the measurements on the planulae consisted of repeated measures of binary outcomes, data on the planktonic stage were assigned to durations from the experiment onset to settlement time (maximum of 160 h) ( Takao & Uye, 2018 ). The combined effect of temperature and salinity on the planktonic duration was tested by two-way ANOVA followed by Tukey pair-wise comparison.…”

Section: Methodsmentioning

confidence: 99%

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Catostylus tagi (Class: Scyphozoa, Order: Discomedusae, Suborder: Rhizostomida, Family: Catostylidae) life cycle and first insight into its ecology

Gueroun

Torres

Santos

et al. 2021

PeerJ

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Jellyfish proliferations, which are conspicuous and natural events, cause blooms that may lead to severe consequences for anthropogenic activities and ecosystem structure and functioning. Although research during the last decade has focused on factors influencing the different jellyfish life stages, few species currently have their full life cycle known. In this context, we describe for the first time the developmental stages in the life cycle of Catostylus tagi, from planula to young medusa, reared in the laboratory. The species displays the typical Rhizostomida metagenetic life cycle. Mature scyphistomae display 16 tentacles and a total body length of 1.5 ± 0.2 mm. Only podocyst production and strobilation were observed. Strobilation, occurring continuously under laboratory conditions, was mainly polydisc. The eight-rayed typical ephyrae, with a total body diameter of 2.4 ± 0.4 mm at detachment, showed development typical of the Rhizostomida. As a first step in studying this species’ ecology, we also present preliminary assessments of: (i) the influence of different temperature and salinity regimes on planulae survival, settlement and metamorphosis and (ii) the effect of temperature and diet on asexual reproduction. The results showed a high tolerance of planulae to a wide range of salinities (15‰ to 25‰), while polyp development was significantly faster at higher temperature (20–25 °C). Strobilation onset was 2–3 times faster at 20 °C (10.6 ± 5.4 to 15 ± 6.6 day at various tested diet) than at 15 °C (32.2 ± 3 day). Feeding was a key factor as unfed polyps never underwent strobilation during the trial. Finally, we present the spatial and seasonal distribution of C. tagi in the Tagus estuary (Portugal) in 2019, showing its occurrence throughout the year (except in April), with most observations recorded on the northern shoreline. As C. tagi shows the ability to form blooms and a wide tolerance for temperature and salinity (for planulae and medusae stage), it is essential to understand its life cycle.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Catostylus tagi (Class: Scyphozoa, Order: Discomedusae, Suborder: Rhizostomida, Family: Catostylidae) life cycle and first insight into its ecology

Gueroun

Torres

Santos

et al. 2021

PeerJ

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“…Although many species of gelatinous zooplankton inhabit estuaries that are subject to varying salinity (Brewer, 1989;Wang et al, 2016;Baumsteiger et al, 2018), only two studies have examined how varying freshwater flows affect jellyfish medusae (Xian et al, 2005;Amorim et al, 2018). Most research examining scyphozoan jellyfish populations in estuaries has focused on settlement of planula larvae and polyp reproduction, and on how salinity changes affects medusa production (Conley and Uye, 2015;Takao and Uye, 2018). Both the planula and polyp stages have limited capacity to move away from areas of reduced salinity (Webster and Lucas, 2012).…”

Section: Introductionmentioning

confidence: 99%

Extreme changes in salinity drive population dynamics of Catostylus mosaicus medusae in a modified estuary

Loveridge

Pitt

Lucas

et al. 2021

Marine Environmental Research

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“…The mortality rate of planula was 82.2 % on average, which is a high rate compared with other scyphozoans [39]. Planulae used in this experiment were 3-day-old individuals after fertilization.…”

Section: Planula Stagementioning

confidence: 89%

Life Cycle of Edible Jellyfish Acromitus hardenbergi Stiasny, 1934 (Scyphozoa: Rhizostomeae) Inhabiting a Brackish-Water Environment

Miyake

Honda

Nishikawa

et al. 2021

Animals

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The edible jellyfish Acromitus hardenbergi Stiasny, 1934 is harvested throughout the year at the mouth of the Perak River, Malaysia. Although this species is an important fishery resource in the local area, limited biological studies have been carried out on it. The aim of the present study was to elucidate the life cycle of this unique brackish-water jellyfish in order to conserve the species and develop sustainable jellyfish fisheries. Mature medusae were collected at the mouth of the Perak River. Embryonic and larval development after fertilization was completed within 24 h until the planula stage and within 48 h until the polyp stage. Primary polyps had a long stalk with a small stolon at the base of the calyx. Fully developed polyps were bowl-or goblet-shaped but became an elongated stalk under starved conditions. Asexual reproduction was accomplished only by means of budding, and no podocysts were produced. Strobilation was mono-disc type. These characteristics may be adaptations to the dynamic environmental conditions in the estuary of the Perak River, where salinity fluctuates widely due to strong inflows of highly turbid freshwater coupled with tidal changes. This study suggests that polyps of A. hardenbergi expand their population not by podocysts, but by budding as quickly as possible and forming one large ephyra by mono-disc strobilation without the residuum, because the polyp cannot remain for a long time at its settlement place in the sediment-rich environment with drastic salinity change.

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Effects of low salinity on the physiological ecology of planulae and polyps of scyphozoans in the East Asian Marginal Seas: potential impacts of monsoon rainfall on medusa population size

Cited by 12 publications

References 58 publications

Catostylus tagi (Class: Scyphozoa, Order: Discomedusae, Suborder: Rhizostomida, Family: Catostylidae) life cycle and first insight into its ecology

Catostylus tagi (Class: Scyphozoa, Order: Discomedusae, Suborder: Rhizostomida, Family: Catostylidae) life cycle and first insight into its ecology

Extreme changes in salinity drive population dynamics of Catostylus mosaicus medusae in a modified estuary

Life Cycle of Edible Jellyfish Acromitus hardenbergi Stiasny, 1934 (Scyphozoa: Rhizostomeae) Inhabiting a Brackish-Water Environment

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