title: Social behaviour in mesopelagic jellyfish.
abstract: Gelatinous organisms apparently play a central role in deep pelagic ecosystems, but lack of observational methodologies has restricted information on their behaviour. We made acoustic records of diel migrating jellyfish Periphylla periphylla forming small, ephemeral groups at the upper fringe of an acoustic scattering layer consisting of krill. Groups of P. periphylla were also documented photographically using a remotely operated vehicle (ROV). Although the adaptive value of group formation remains speculative, we clearly demonstrate the ability of these jellyfishes to locate and team up with each other.
authors.affiliation: 1] 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.
authors.forename: Stein
authors.initials: S
authors.lastname: Kaartvedt
authors.affiliation: University of Oslo, Department of Biosciences, PO Box 1066 Blindern, 0316 Oslo, Norway.
authors.forename: Karl I
authors.initials: KI
authors.lastname: Ugland
authors.affiliation: 1] King Abdullah University of Science and Technology, Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia [2] Institute of Marine research, POBox 1870 Nordnes, 5817 Bergen, Norway.
authors.forename: Thor A
authors.initials: TA
authors.lastname: Klevjer
authors.affiliation: King Abdullah University of Science and Technology, Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Anders
authors.initials: A
authors.lastname: Røstad
authors.affiliation: University of Oslo, Department of Biosciences, PO Box 1066 Blindern, 0316 Oslo, Norway.
authors.forename: Josefin
authors.initials: J
authors.lastname: Titelman
authors.affiliation: King Abdullah University of Science and Technology, Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Ingrid
authors.initials: I
authors.lastname: Solberg
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D037401:Scyphozoa / Q000502:physiology*; D012919:Social Behavior