Flexible diel vertical migration behaviour of zooplankton in the Irish Sea

Xabier Irigoyen*, David V.P. Conway, Roger P. Harris

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

The diel vertical migration (DVM) of the whole plankton community was investigated in the central and coastal Irish Sea. Generally, more than 60 % of the plankton did not perform significant DVM. A correlation analysis of the weighted mean depths of different organisms and their potential predators suggested relationships between 2 groups: Oithona spp., copepod nauplii and fish larvae, and Calanus spp., Pseudocalanus elongatus and chaetognaths (Sagitta spp.). Organisms showing significant DVM were chaetognaths (Sagitta spp.), Calanus spp. and P. elongatus. Calanus spp. showed clear ontogenic variations in DVM and, along with P. elongatus, demonstrated great flexibility in both the amplitude and direction of migration. P. elongatus did not migrate in the coastal area and Calanus spp. showed a clear reverse migration. The direction of migration appeared to be related to the vertical position of the chaetognaths in the water column during the day.

Original languageEnglish (US)
Pages (from-to)85-97
Number of pages13
JournalMarine Ecology Progress Series
Volume267
DOIs
StatePublished - Feb 19 2004

Keywords

  • Calanus spp.
  • Chaetognaths
  • Diel vertical migration
  • Fish larvae
  • Oithona spp.
  • Pseudocalanus spp.

ASJC Scopus subject areas

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

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