Trophic ecology and assessment of the predatory impact of the Moon jellyfish Aurelia aurita (Linnaeus, 1758) on zooplankton in the Black Sea


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

CAHIERS DE BIOLOGIE MARINE, vol.61, no.1, pp.33-46, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 61 Issue: 1
  • Publication Date: 2020
  • Doi Number: 10.21411/cbm.a.96dd01aa
  • Journal Name: CAHIERS DE BIOLOGIE MARINE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Geobase, Veterinary Science Database
  • Page Numbers: pp.33-46
  • Keywords: Scyphozoa, Aurelia aurita, Digestion time, Ration, Food requirements, Predation pressure, FISH LARVAE, RESPIRATION, TEMPERATURE, GROWTH, RATES, SCYPHOZOA, COMMUNITY, DYNAMICS, MEDUSAE, SIZE
  • Middle East Technical University Affiliated: Yes

Abstract

Experiments on the feeding of the Moon jellyfish Aurelia aurita have shown that digestion time of zooplankton typically varies between 2.2 and 5.1 h depending on the body weight of the predator, diet composition, amount of food, and seawater temperature. The daily ration of a Moon jellyfish with a wet body mass of 1 g reached 0.025-2.845 mg zooplankton.ind(-1).day(-1) corresponding to a carbon-specific food uptake of 0.2-9.1% C day(-1) with a mean value around 0.5% C day(-1). Such mesozooplankton consumption rates are consistent with the ration values (around 0.9% C day(-1)) calculated from the feeding rate experiments of jellyfish at natural food concentrations. However, in both cases the amount of mesozooplankton was insufficient to compensate for the minimum food requirements, calculated from oxygen consumption (6.7 +/- 0.6% C day(-1)) of the jellyfish. On average, the metabolic expenses of A. aurita were about one order of magnitude greater than its ration supplied by mesozooplankton, indicating the important role of visually overlooked food components in the jellyfish diet.