Alternative conditions of mass appearance of the scyphozoan jellyfish, &lt;i&gt;Aurelia aurita&lt;/i&gt; (Linnaeus, 1758), and the ctenophore, &lt;i&gt;Pleurobrachia pileus&lt;/i&gt; (O.F. Muller, 1776), in plankton of the Black Sea

Аннинский, Б. Е.; Финенко, Г. А.; Datsyk, N. A.

doi:10.18470/1992-1098-2020-2-35-47

Cited by 5 publications

(11 citation statements)

References 26 publications

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“…m -2 and 7.2 ± 0.7 g m -2 ) (Hubareva & Anninsky, 2020). Moreover, in the studies on the Crimean shelf, no valid relationship was found between the rate of somatic growth or biomass of the jellyfish and the total number (or biomass) of fodder zooplankton or copepods only (Anninsky et al, 2020b).…”

Section: Resultsmentioning

confidence: 95%

“…with the number of P. pileus being higher in 2017, the biomass of this species was lower. This could be due to the increased elimination of the last year's generation (12-24 mm individuals) in the late autumn of 2017 (Anninsky et al, 2020b). Thus, the generative renewal of P. pileus population was more efficient in 2017 (higher abundance and lower biomass) than in 2016.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the potential predatory impact of A. aurita on planktonic communities in 2017 could have been stronger than that of M. leidyi during the years of expansion into the Black Sea. Although the respiration rate of medusa is close to its maximum at 20 ° C (224.6 µl O day -1 for 1 g WW individual) and should decrease to 116.4 µl O day -1 for 1 g WW individual at habitat temperature of 11 °C (Anninsky, 2009), the food requirements of A. aurita to compensate metabolic losses (Anninsky, 2020b), during November 2017 could reach ~245 mg zoopl. m -2 day -1 (~19 mg С org day -1 ) and ~280 mg zoopl.…”

Section: Resultsmentioning

confidence: 99%

“…These temperature variations were advantageous for A. aurita, although they did not always directly affect the somatic growth of the jellyfish. Weaker warming-up of surface layers of the sea in July-August 2017 undoubtedly reduced the temperature isolation of this species, which rarely penetrates into the surface horizons at > 20 °C, and individuals found in warm waters in most cases are damaged specimens from the dying generation of the last year (Anninsky et al, 2020b). Near the thermocline, where the main part of A. aurita population usually aggregates in summer (Mutlu, 2001), the concentration of individuals has decreased, the competition for food with the cold-water ctenophore P. pileus (Mutlu & Bingel, 1999) has weakened; therefore, the trophic conditions for the existence of the jellyfish have improved.…”

Section: Resultsmentioning

confidence: 99%

“…The rates of somatic growth of jellyfish in 1999-2015 were estimated according to the data of long-term monitoring at the outer shelf of the Sevastopol Bay (Finenko et al, 2015;Anninsky et al, 2020b). The corresponding data for 2016 and 2017 were obtained from the results of research during the 89th (October) and 98th (November) autumn cruises of the RV 'Professor Vodyanitsky' (Anninsky et al, 2019;present study).…”

Section: Methodsmentioning

confidence: 99%

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Expansion of gelatinous macrozooplankton in the open Black Sea off Crimea under the weather events of recent years

et al. 2022

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Species composition, abundance, and distribution of gelatinous macroplankton in coastal and deep-sea areas of the Black Sea in November 2017 are discussed. Despite the fact that species composition of gelatinous macroplankton (medusa Aurelia aurita, ctenophores Mnemiopsis leidyi, Pleurobrachia pileus, and Beroe ovata) in 2017 did not differ from that in 2016, structural changes occured. In autumn 2017 A. aurita and B. ovata biomass was higher than in 2016 whereas the inverse difference was observed in their abundance values. Namely, A. aurita biomass was on average 514 g m-2 and 634 g m-2 in the outer shelf and deep-sea areas, respectively. Both parameters of M. leidyi and P. pileus declined in 2017 compared to the previous year. In addition, the share of large-sized individuals increased in 2017, while that of small-sized animals decreased, in comparison with 2016. The number of small individuals increased in P. pileus and decreased in M. leidyi, although their biomass before the seasonal appearance of B. ovata in plankton was close to that in 2016. The unprecedented increase in the medusae biomass in November 2017 could not be explained only by the competition with planktivorous ctenophores and may indicate alternative drivers controlling population dynamics of A. aurita in the Black Sea. A negative correlation was depicted between the Danube discharge in February-March and the rate of somatic growth of A. aurita.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Expansion of gelatinous macrozooplankton in the open Black Sea off Crimea under the weather events of recent years

et al. 2022

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Research into bioluminescence of the Black Sea ctenophores Pleurobrachia pileus O.F. Müller, 1776

et al. 2023

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The work presents the findings of the laboratory and in situ studies of ctenophore Pleurobrachia pileus O.F. Müller, 1776 which have shown that this species has bioluminescent properties. These organisms were considered non‐luminous before. P. pileus bioluminescence was studied on board RV Professor Vodyanitsky during its 116th voyage. Sampling live organisms was preceded by probing with the Salpa MA+ probe to register the daily maximum glow in redoxcline, which in this zone was recorded, as a rule, in the depth range of 60–70 m, where dense clusters of P. pileus were formed at that time. The samples of ctenophores were taken by a Bogorov–Rass plankton net. After the net was closed, it was lifted to the surface at a speed of 0.4–0.5 m s−1. It was shown that only at a temperature not exceeding 14°C, the P. pileus remained alive for 2–3 days. The data provided indicate that the temperature above 14°C is close to the maximum permissible for P. pileus; therefore, chemical and mechanical stimulation experiments were carried out at this temperature (14°C) to agitate ctenophores luminescence. Though, the nature of their signal was significantly different. The total percentage of luminous organisms from the entire catch was 32.43%, which unequivocally proves that P. pileus glows and makes a significant contribution to the intensity of the glow at great depths in redoxcline.

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The pelagic ecosystem of the Black Sea goes gelatinous

Zagorodnyaya

Piontkovski

Gubanov

2023

Marine Biology Research

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Alternative conditions of mass appearance of the scyphozoan jellyfish, <i>Aurelia aurita</i> (Linnaeus, 1758), and the ctenophore, <i>Pleurobrachia pileus</i> (O.F. Muller, 1776), in plankton of the Black Sea

Cited by 5 publications

References 26 publications

Expansion of gelatinous macrozooplankton in the open Black Sea off Crimea under the weather events of recent years

Expansion of gelatinous macrozooplankton in the open Black Sea off Crimea under the weather events of recent years

Research into bioluminescence of the Black Sea ctenophores Pleurobrachia pileus O.F. Müller, 1776

The pelagic ecosystem of the Black Sea goes gelatinous

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