Title: Turbulence and Feeding Behaviour Affect the Vertical Distributions of Oithona Similis and Microsetella Norwegica
Citation: MARINE ECOLOGY-PROGRESS SERIES vol. 313 p. 157-172
Publication Year: 2006
JRC N°: JRC30814
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30814
Type: Articles in periodicals and books
Abstract: The small copepods Oithona similis and Microsetella norwegica are often numerically abundant and widely distributed, but the factors controlling their vertical distributions and role in carbon cycling are yet unknown. Here we examined the vertical distributions of copepods during spring and summer in the Skagerrak and during autumn in the North Sea with respect to different physiochemical factors. The ambush feeder O. similis numerically dominated the copepod community and were located in the layers with high microzooplankton abundance. M. norwegica were dominant in the Skagerrak and observed within or just below the pycnocline and are assumed to feed on sinking detrital aggregates. Both copepods use remote detection of either hydromechanical (O. similis) or chemical signals (M. norwegica) generated by the prey and both species migrated to deeper depths in response to elevated surface turbulence. The potential effect of turbulence on both types of feeding is theoretically shown to be negative and we suggest a turbulent dissipation rate in the range 10-7 ¿ 10-6 m2 s-3 as a threshold to trigger the observed avoidance responses.
JRC Directorate:Sustainable Resources

Files in This Item:
There are no files associated with this item.

Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.