Vertical distribution and trophic interactions of zooplankton and fish in Masfjorden, Norway (original) (raw)
The distribution. biomass. and predator-prey relationships of the pelagic asst'mhlage in Masfjorden. western Norway. was st udied in January I'.IX9. The pelugic hiomns.~ wns uomi• nated by particulate organic matter. Biomasses of copepods. macroplnnkton. IInd mesnpelugic fishes were of the same orde r of magnitude. while the: biomass of larger pelugi(' fishe:s were one o rder less. Predator-prey relationships seemed most important lit intermedinte: and higher trophic levels. Two sound-scattering layers, consisting of adult Mal/rolicl/s rnuelleri (lower laye r) and juvenile M. rnuellt'ri (upper IlI yer) performed inslUntaneous li ghtdependent verticIII migration. Vertical distributions arc explained in te rms of balancing food demands agai nst predation risk.
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