Asexual reproduction strategies in the moon jellyfish Aurelia (Cnidaria: Scyphozoa)

Abstract

The genusAureliais one of the major contributors to jellyfish blooms in coastal waters, possibly due to its adaptive reproduction strategies. DifferentAurelialineages have adapted their reproduction modes to varying environmental conditions in their respective habitats. To understand the successful adaptation strategies, three strains ofAurelia coeruleaand two strains ofAurelia solidapolyps from different geographical areas were exposed to a range of temperatures and two food regimes, and the effects on reproduction rates were assessed. Asexual reproduction was significantly affected by the changes in these factors. The highest reproduction rate under sufficient food conditions was observed in the United States strain and the lowest was observed in the Israel strain, regardless of temperature, indicating the differences in the blooming potential. Six asexual reproduction modes were observed, of which lateral budding, lateral budding by means of stolons, and reproduction from parts of stolons were the main modes used by allAureliastrains, exceptAurelia solidaISR, for which reproduction by stolons was the main mode. The capability to switch reproductive strategies in response to environmental cues depending on the lineage predetermines the highly frequent blooming events ofAurelia.