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- W2006649580 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 186:211-217 (1999) - doi:10.3354/meps186211 Wavelength-specific behaviour in Lepeophtheirus salmonis and Calanus finmarchicus to ultraviolet and visible light in laboratory experiments (Crustacea: Copepoda) Knut A. Aarseth1,*, Thomas A. Schram2 1Agricultural University of Norway, PO Box 5065, 1432 Aas, Norway 2Department of Biology, Section of Marine Zoology and Marine Chemistry, University of Oslo, PO Box 1064 Blindern, 0316 Oslo, Norway *E-mail: knut.aarseth@itf.nlh.no ABSTRACT: The significance of ultraviolet light as a cue in diel vertical migration of free-swimming copepodids of the ectoparasite salmon louse Lepeophtheirus salmonis (Krøyer) and adults of the holopelagic Calanus finmarchicus (Gunnerus) were examined in the laboratory. Copepodids of salmon lice were photopositive in 1 m deep water columns when illuminated with visible light (VIS) only, but when VIS was combined with ultraviolet light, with a spectral irradiance maximum at 313 nm, the copepodids gathered significantly deeper in the water column. In similar experiments C. finmarchicus did not show upward migration as a response to VIS, and a combination with ultraviolet light did not alter their normal behaviour. In 250 ml beakers, however, C. finmarchicus showed avoidance behaviour upon being exposed to UV-light; the copepods swam vigorously with prosome pointing downwards as if they were trying to escape from the irradiation. We conclude that these copepods must have sensory structures not yet described which can detect UV-radiation. Possible implications of these findings are discussed in relation to vertical migration and to host-finding in the salmon louse. KEY WORDS: Copepods · Calanus finmarchicus · Lepeophtheirus salmonis · Diel vertical migration · UVR Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 186. Publication date: September 17, 1999 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1999 Inter-Research." @default.
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- W2006649580 title "Wavelength-specific behaviour in Lepeophtheirus salmonis and Calanus finmarchicus to ultraviolet and visible light in laboratory experiments (Crustacea:Copepoda)" @default.
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