Effects of hyposalinity on survival and settlement of moon jellyfish (Aurelia aurita) planulae

Conley, Keats R.; Uye, Shin-ichi

doi:10.1016/j.jembe.2014.10.018

Cited by 36 publications

(40 citation statements)

References 37 publications

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“…Therefore, the abundance variability between lagoons and within each lagoon depends primarily on the benthic population dynamics and the environmental drivers acting at this stage (Boero et al, 2008). A recent study showed that salinity at 15 significantly increased the duration of the planulae stage increasing morphological deformities of settled polyps and salinity at 20 caused delayed tentacle development of polyps (Conley and Uye, 2015). Hence, we hypothesize that survival of planulae, polyps and deformed ephyrae is affected in environments like Berre and Bages-Sigean, where salinity ranged from 15 to 27 and 18 to 34, respectively, explaining the low abundances observed there.…”

Section: Discussion Life Cyclementioning

confidence: 99%

Pelagic population dynamics ofAureliasp. in French Mediterranean lagoons

et al. 2015

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The pelagic dynamics of the cosmopolitan scyphozoan Aurelia sp. was investigated in three French Mediterranean lagoons, Thau, Berre and Bages-Sigean, which harbour resident populations. The annual cycles showed a common univoltine pattern in all lagoons where the presence of pelagic stages in the water column lasted 8 months. Field observations showed a release of ephyrae in winter time followed by pronounced growth between April and July, when individuals reached the largest sizes, before disappearing from the water column. Maximum abundance of ephyrae and medusae were registered in Thau. Medusae abundance attained a maximum of 331 ind 100 m 23 in Thau, 18 ind 100 m 23 in Berre and 7 ind 100 m 23 in Bages-Sigean lagoons. Temperature and zooplankton abundance appeared as leading factors of growth, where Bages-Sigean showed the population with higher growth rates (2.66 mm day 21) and maximum size (32 cm), followed by Thau (0.57-2.56 mm day 21 ; 22.4 cm) and Berre (1.57-2.22 mm day 21 ; 17 cm). The quantification of environmental windows used by the species showed wider ranges than previously reported in the Mediterranean Sea, which suggests a wide ecological plasticity of Aurelia spp. populations in northwestern Mediterranean lagoons.

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Section: Discussion Life Cyclementioning

confidence: 99%

Pelagic population dynamics ofAureliasp. in French Mediterranean lagoons

et al. 2015

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“…; Tarrant et al. ; Conley & Uye ). Resistance to these abiotic stressors varies across life stages (Markey et al.…”

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confidence: 99%

“…Additional key words: abiotic stress, Cnidaria, hormesis, resource allocation, somatic maintenance Organisms are regularly exposed to stressful abiotic conditions that perturb the homeostatic balance of living cells, impair function, and can result in loss of evolutionary fitness (Selye 1956;McEwen & Wingfield 2003;Walker et al 2012;Costantini 2014). In cnidarians, exposure to abiotic stressors like heat, cold, UV radiation, high (and low) salinity, or pollutants can be a major source of mortality (Glynn & D'Croz 1990;Dustan 1999;Lesser 2006;Soares & Sousa 2011;Llabr es et al 2013;Tarrant et al 2014;Conley & Uye 2015). Resistance to these abiotic stressors varies across life stages (Markey et al 2007;Putnam et al 2010;Byrne 2011;H edouin et al 2016), between populations (McClanahan et al 2004;Ulstrup et al 2006;Kenkel et al 2013), and between species (Bosch et al 1988;Fitt & Warner 1995;Marshall & Baird 2000;Karntanut & Pascoe 2002;Negri et al 2007;Movilla et al 2016).…”

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confidence: 99%

Life history traits and previous exposure predict resistance to UV irradiation in the freshwater cnidarian Hydra oligactis

Tökölyi

Kozma

Sebestyén

et al. 2017

Invertebrate Biology

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Abiotic stress is an important source of mortality for cnidarians and is likely to be a major factor shaping their life histories. In freshwater hydra, the ability to withstand exogenous sources of stress varies between species and populations, but little is known about the factors responsible for this variation. Here, we investigated resistance to UV irradiation in Hydra oligactis, a common temperate freshwater cnidarian. We collected polyps from 12 populations and propagated these asexually under standard conditions in the laboratory to obtain 69 laboratory clonal lines with a total of 324 polyps of different age. We measured the size of polyps and recorded their budding rate. In addition, a subset of animals was exposed to hormetic treatment, where experimental animals received a short, sublethal irradiation 2 d before testing their resistance to a higher dose. We investigated how life history traits (age, size, and budding rate), hormetic treatment, and the interaction between life history traits and hormetic treatment relate to the ability of hydra polyps to tolerate high doses of UV irradiation. In multivariate models controlling for the effect of other variables, stress tolerance was positively related to age (lower tolerance in freshly detached buds compared to adult hydra) and size (higher tolerance in polyps with a large body column). Budding rate was negatively associated with stress tolerance. Hormetic treatment increased resistance to UV irradiation, but we found no evidence for an interaction between hormetic response and any of the life history traits, suggesting that the ability to upregulate physiological defense mechanisms after exposure to mild stress does not depend on the life history background of the individuals.

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“…Although population dynamics of jellyfish have been considered difficult to predict because of their complex life history (Conley & Uye 2015), Schneider & Behrends (1994) reported that the abundance of medusae of the jellyfish Aurelia aurita (L.) was affected by the population size and survival of planulae, polyps, and ephyrae. The abundance of planulae in particular determines that of polyps, which asexually produce ephyrae, and thus may have a strong influence on jellyfish blooms (Lucas 2001).…”

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confidence: 99%

“…The jellyfish Aurelia spp. are distributed worldwide in coastal areas from 70°N to 40°S latitude (Yasuda 2003), and they spawn in the summer (Conley & Uye 2015). Spawned eggs are held in the brood pouches on the oral arms of medusae (Yasuda 2003).…”

mentioning

confidence: 99%

Larvae of the threadsail filefish <i>Stephanolepis cirrhifer</i> feed on eggs and planulae of the jellyfish <i>Aurelia</i> sp. under laboratory conditions

Miyajima-Taga

Masuda

Yamashita

2016

Plankton Benthos Res

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Although population dynamics of the egg and planula stages of jellyfish are key factors that predict the abundance of polyps and subsequent jellyfish blooms, information about predation on these stages of jellyfish is lacking. We examined whether threadsail filefish Stephanolepis cirrhifer, an efficient predator of Aurelia sp. medusae in the wild, could feed on eggs or planulae of Aurelia under laboratory conditions. S. cirrhifer larvae at 17 days post hatching (dph) with 4.9±0.8 mm standard length fed on significantly more eggs or planulae (maximum value: 151 inds. per 15 min.) than other growth stages of S. cirrhifer larvae (0-18 inds. per 15 min.). Considering prey-size selectivity in fish larvae, the mouth size of S. cirrhifer at 17 dph matches well with consuming jellyfish eggs or planulae as prey. These results suggest that S. cirrhifer larvae, during their free-swimming stage or possibly at the beginning of their jellyfish-commensal stage, can be potential predators of eggs or planulae of jellyfish.

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Effects of hyposalinity on survival and settlement of moon jellyfish (Aurelia aurita) planulae

Cited by 36 publications

References 37 publications

Pelagic population dynamics ofAureliasp. in French Mediterranean lagoons

Pelagic population dynamics ofAureliasp. in French Mediterranean lagoons

Life history traits and previous exposure predict resistance to UV irradiation in the freshwater cnidarian Hydra oligactis

Larvae of the threadsail filefish <i>Stephanolepis cirrhifer</i> feed on eggs and planulae of the jellyfish <i>Aurelia</i> sp. under laboratory conditions

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