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

Eivind Dypvik, Thor Aleksander Klevjer, Stein Kaartvedt

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

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).
Original languageEnglish (US)
Pages (from-to)443-453
Number of pages11
JournalMarine Biology
Volume159
Issue number2
DOIs
StatePublished - Nov 8 2011

ASJC Scopus subject areas

  • Ecology
  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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