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Social behaviour in mesopelagic jellyfish
Stein Kaartvedt1, Karl I Ugland2, Thor A Klevjer3
11] University of Oslo, Department of Biosciences, PO Box 1066 Blindern, 0316 Oslo, Norway [2] King Abdullah University of Science and Technology, Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia.
Scientific Reports
|June 13, 2015
Summary
Deep-sea jellyfish, Periphylla periphylla, form small groups, observed using acoustics and ROVs. This study shows their ability to find and associate with each other in pelagic ecosystems.
Area of Science:
- Marine Biology
- Deep-sea Ecology
- Jellyfish Behavior
Background:
- Gelatinous organisms are crucial in deep pelagic ecosystems.
- Limited observational methods hinder understanding of their behavior.
Purpose of the Study:
- To investigate the behavior and group formation of deep-sea jellyfish, Periphylla periphylla.
- To document diel vertical migration patterns and associations with other organisms.
Main Methods:
- Acoustic recordings were used to detect jellyfish groups during diel migrations.
- Remotely operated vehicles (ROVs) provided photographic documentation of jellyfish aggregations.
- Observations were made at the upper fringe of an acoustic scattering layer composed of krill.
Main Results:
- Acoustic data revealed Periphylla periphylla forming small, temporary groups.
- Photographic evidence confirmed these jellyfish aggregations.
- Jellyfish were observed associating with krill layers, suggesting potential ecological interactions.
Conclusions:
- Periphylla periphylla exhibit the ability to locate and form groups, challenging previous assumptions about their solitary nature.
- The adaptive value of group formation in these jellyfish warrants further investigation.
- This study highlights the importance of advanced methodologies for studying deep-sea gelatinous zooplankton.
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