Full-depth zooplankton profiles over the deep bathyal of the NE Atlantic
Koppelmann, R.; Weikert, H. (1992). Full-depth zooplankton profiles over the deep bathyal of the NE Atlantic. Mar. Ecol. Prog. Ser. 86(3): 263-272
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, more
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| Keywords |
Analysis > Mathematical analysis > Statistical analysis > Regression analysis
Aquatic communities > Plankton > Zooplankton
Availability > Food availability
Detritus
Population characteristics > Biomass
Profiles > Vertical profiles
Suspension > Resuspension
Temporal variations > Periodic variations > Diurnal variations
Trophic relationships
Variability
Copepoda [WoRMS]; Metridia Boeck, 1865 [WoRMS]; Pleuromamma Giesbrecht in Giesbrecht & Schmeil, 1898 [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Koppelmann, R.
- Weikert, H.
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| Abstract |
Vertical profiles of zooplankton (size range less than 5 mm) were taken with a 1 m2 MOCNESS (333 mu m mesh aperture) from the >4000 m water column at sites in the NE Atlantic. In the upper 1000 m, the profiles tended to exhibit high variability and were influenced by diurnal migrations, but below, the distributions were nearly similar. The standing crop in the upper 400 m was remarkably low, possibly due to a bloom of salps and their grazing pressure on the phytoplankton crop. The non-linear decrease of the normalized zooplankton abundance and biomass below 1000 m in the area investigated could be approximated by a power function. The improved regression "model" revealed no differences between the slopes when compared to biomass data from other marine locations given by various authors. This indicates that the processes of vertical material flux seem to be similar in many bathypelagic systems of the open sea. The y-intercepts, however, showed differences due to either a higher surface productivity in some ocean areas or differences in sampling methods and evaluation of the material. |
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