Seasonal variations in vertical migration of glacier lanternfish, Benthosema glaciale

The seasonal variations in glacier lanternfish (Benthosema glaciale) vertical distribution and diel vertical migration (DVM) were studied by use of a bottom-mounted upward-facing 38 kHz echo sounder deployed at 392 m depth and cabled to shore in Masfjorden (~6052?N, ~524?E), Norway. Acoustic data fr...

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Bibliographic Details
Published in:Marine Biology
Main Authors: Dypvik, Eivind, Røstad, Anders, 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), Unidad Académica de Sistemas Arrecifales (Puerto Morelos), Instituto de Ciencias Del Mar y Limnología, Universidad Nacional Autõnoma de México, Puerto Morelos, QR 77580, Mexico, School of Natural Sciences, University of California Merced, 5200 North Lake Road, Merced, CA 95343, United States
Format: Article in Journal/Newspaper
Language:English
Published: Springer Nature 2012
Subjects:
acoustic data
crustacean
diel migration
echo sounder
prey availability
sampling
seasonal variation
teleost
vertical distribution
vertical migration
zooplankton
Hordaland
Masfjorden
Norway
Benthosema glaciale
Calanoida
Copepoda
Myctophidae
glacier
Copepods
Online Access:http://hdl.handle.net/10754/325452
https://doi.org/10.1007/s00227-012-1953-2
Description
Summary:The seasonal variations in glacier lanternfish (Benthosema glaciale) vertical distribution and diel vertical migration (DVM) were studied by use of a bottom-mounted upward-facing 38 kHz echo sounder deployed at 392 m depth and cabled to shore in Masfjorden (~6052?N, ~524?E), Norway. Acoustic data from July 2007-October 2008 were analyzed, and scattering layers below ~220 m during daytime were attributed to glacier lanternfish based on net sampling in this, and previous studies, as well as from analysis of the acoustic data. At these depths, three different diel behavioral strategies were apparent: normal diel vertical migration (NDVM), inverse DVM (IDVM), and no DVM (NoDVM). NoDVM was present all year, while IDVM was present in autumn and winter, and NDVM was present during spring and summer. The seasonal differences in DVM behavior seem to correlate with previously established seasonal distribution of prey. We hypothesize that in regions with seasonally migrating zooplankton, such as where calanoid copepods overwinter at depth, similar plasticity in DVM behavior might occur in other populations of lanternfishes. 2012 The Author(s).

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