Inverse vertical migration and feeding in glacier lanternfish (Benthosema glaciale)

A bottom-mounted upward-facing 38-kHz echo sounder was deployed at ~400 m and cabled to shore in Masfjorden (~60 52?N, ~5 24?E), Norway. The scattering layers seen during autumn (September-October) 2008 were identified by trawling. Glacier lanternfish (Benthosema glaciale) were mainly distributed be...

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Bibliographic Details
Published in:Marine Biology
Main Authors: Dypvik, Eivind, Klevjer, Thor Aleksander, Kaartvedt, Stein
Other Authors: King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering (BESE) Division, Marine Science Program, Red Sea Research Center (RSRC), Department of Biology, University of Oslo, P.O. Box 1066, Blindern, 0316 Oslo, Norway
Format: Article in Journal/Newspaper
Language:English
Published: Springer Nature 2011
Subjects:
activity pattern
diel migration
echo sounder
feeding behavior
marine environment
overwintering
population distribution
prey capture
stomach content
teleost
trawling
vertical migration
Hordaland
Masfjorden
Norway
Benthosema glaciale
Calanus
glacier
Online Access:http://hdl.handle.net/10754/325441
https://doi.org/10.1007/s00227-011-1822-4
Description
Summary:A bottom-mounted upward-facing 38-kHz echo sounder was deployed at ~400 m and cabled to shore in Masfjorden (~60 52?N, ~5 24?E), Norway. The scattering layers seen during autumn (September-October) 2008 were identified by trawling. Glacier lanternfish (Benthosema glaciale) were mainly distributed below ~200 m and displayed three different diel behavioral strategies: normal diel vertical migration (NDVM), inverse DVM (IDVM) and no DVM (NoDVM). The IDVM group was the focus of this study. It consisted of 2-year and older individuals migrating to ~200-270 m during the daytime, while descending back to deeper than ~270 m during the night. Stomach content analysis revealed increased feeding during the daytime on overwintering Calanus sp. We conclude that visually searching glacier lanternfish performing IDVM benefit from the faint daytime light in mid-waters when preying on overwintering Calanus sp. 2011 The Author(s).

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