Interannual Population Dynamics of the Ctenophore Beroe ovata Bruguière, 1789 at the Outer Shelf of Sevastopol Bay of the Black Sea

Anninsky, B. E.; Finenko, G. A.; Datsyk, N. A.

doi:10.1134/s2075111723020030

Cited by 4 publications

(2 citation statements)

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“…Pleurobrachia pileus daily migrates vertically, like its main prey, copepods, does. Ctenophores spend the night in the upper water layers, usually just below the thermocline, descending to the depth of 80 to 150 m in early morning and ascending again in the late afternoon [2,14]. The mentioned migrations were observed in our expeditions [21].…”

Section: Methodsmentioning

confidence: 58%

“…The study of gelatinous macroplankton is also a matter of interest from another point of view since climate warming and an increase in anthropogenic eutrophication at the same time have resulted in a significant growth of population of not only ctenophores but also jellyfish in some cases [2,3]. This has affected the state of marine communities and impacted human activities.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%