PLANKTON ABUNDANCE IN THE NORTH ATLANTIC OCEAN (I). A ROTARY SYSTEM FOR CALIBRATING FLOW METERS (II).

Geographic variations in zooplankton biomass, expressed as displacement volume, wet weight, dry weight and ash weight, were determined from 246 plankton samples collected during 1958-1968 over wide regions of the North Atlantic. The study corroborates previous investigations that zooplankton abundan...

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Bibliographic Details
Main Authors: Be,Allan W. H., Forns,Joseph M., Harrison,Stanley
Other Authors: LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES N Y
Format: Text
Language:English
Published: 1969
Subjects:
Biology
Biological Oceanography
Test Facilities
Equipment and Methods
*PLANKTON
*FLOWMETERS
ATLANTIC OCEAN
CALIBRATION
DISTRIBUTION
SAMPLING
COLLECTING METHODS
VOLUME
WEIGHT
OCEAN CURRENTS
DIURNAL VARIATIONS
ACCURACY
BIOMASS
NORTH ATLANTIC OCEAN
SEASONAL VARIATIONS
TAXONOMY
North Atlantic
Subarctic
Online Access:http://www.dtic.mil/docs/citations/AD0690930
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0690930
Description
Summary:Geographic variations in zooplankton biomass, expressed as displacement volume, wet weight, dry weight and ash weight, were determined from 246 plankton samples collected during 1958-1968 over wide regions of the North Atlantic. The study corroborates previous investigations that zooplankton abundancies are high in subarctic and cold-temperate waters, along oceanic margins, upwelling regions and active current systems -- where nutrient-rich mixed layers exist for varying durations of the year. The regional variations in zooplankton abundance are of sufficiently large magnitude that they mask variations due to diurnal vertical migration, local patchiness and non-synoptic sampling. However, seasonal variations in high latitudes are very large and they are likely to significantly alter our summer and fall estimates of biomass. The use of flow meters on plankton nets is standard procedure for quantitative sampling. A method for the periodic recalibration of both mechanical and electric flow meters is given. (Author)

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