Design and calibration of a new optical plankton counter capable of sizing small zooplankton

Herman, Alex W.

doi:10.1016/0198-0149(92)90080-d

Cited by 185 publications

(169 citation statements)

References 5 publications

Supporting

Mentioning

164

Contrasting

Unclassified

Order By: Relevance

“…That increase was dominated by copepods with approximate lengths of 1 mm. These copepods would be ideally sampled by the OPC in the size range 0.65 -1.35 mm ESD (Herman, 1992; following particle length approximately 1.5 times ESD according to Beaulieu et al, 1999) and it is likely that the OPC data reflect their increased abundance in the frontal jet. The lack of diel migratory signal in both the acoustic and OPC data for this patch also agreed with previous observations.…”

Section: Discussionmentioning

confidence: 99%

“…The OPC estimates the Equivalent Spherical Diameter (ESD) of particles which break a 640 nm wavelength LED light beam. The instrument is designed to resolve ESD's between 250 µm and 3 mm (Herman, 1992), which represent approximate lengths of 500 µm to 30 mm (Huntley et al, 1995). Processing of the OPC data files followed the route developed by Pollard et al (1996).…”

Section: Opc Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Mesoscale subduction at the Almeria–Oran front

Fielding

Crisp

Allen

et al. 2001

Journal of Marine Systems

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Opc Measurementsmentioning

confidence: 99%

Mesoscale subduction at the Almeria–Oran front

Fielding

Crisp

Allen

et al. 2001

Journal of Marine Systems

View full text Add to dashboard Cite

show abstract

“…As a particle passes the sensor, the portion of blocked light is measured and recorded as a digital size and converted to an ESD. This value represents the diameter of a sphere that would have the same cross-sectional area as the particle being measured, using a semiempirical formula based on calibration with black spheres of known diameters (Herman 1992;Herman et al 2004). Processing the raw LOPC data requires extensive post-processing filtering and interpretation in several steps.…”

Section: Methodsmentioning

confidence: 99%

Large versus small zooplankton in relation to temperature in the Arctic shelf region

et al. 2018

View full text Add to dashboard Cite

“…Upon reaching the Seychelles, the samples from the ¢rst leg were sub-sampled and processed through an optical plankton counter (OPC; Herman, 1992) at the Shoals of Capricorn base. The mesozooplankton samples from the second leg were similarly sub-sampled and processed, using identical equipment, at the Shoals of Capricorn base on Rodrigues Island, Mauritius.…”

Section: Methodsmentioning

confidence: 99%

Epipelagic mesozooplankton distribution and abundance over the Mascarene Plateau and Basin, south-western Indian Ocean

et al. 2004

View full text Add to dashboard Cite

The crescent shaped Mascarene Plateau (south-western Indian Ocean), some 2200 km in length, forms a partial barrier to the (predominantly westward) £ow of the South Equatorial Current. Shallow areas of the Mascarene Plateau e¡ectively form a large shelf sea without an associated coastline. Zooplankton sampling transects were made across the plateau and also the basin to the west, to investigate the role the partial interruption of £ow has on zooplankton biomass and community structure over the region. Biomass data from optical plankton counter (OPC) analysis, and variability in community structure from taxonomic analysis, appear to indicate that the obstruction by the plateau causes upwelling, nutrient enrichment and enhanced chlorophyll and secondary production levels downstream.The Mascarene Basin is clearly distinguishable from the ridge itself, and from the waters to the south and north, both in terms of size-distributed zooplankton biomass and community structure. Satellite remote sensing data, particularly remotely-sensed ocean colour imagery and the sea surface height anomaly (SSHA), indicate support for this e¡ect. A correlation was found between OPC biovolume and SSHA and sea surface temperature (SST), which may indicate the physical processes driving mesozooplankton variability in this area. Biomass values away from the in£uence of the ridge averaged 24 mg m À3 , but downstream of the ridge biomass averaged 263 mg m À3 . Copepods comprised 60% of the mean total organisms. Calanoid copepod numbers varied considerably between regions, being lowest away from the in£uence of the plateau, where higher numbers of the cyclopoid copepods Oithona spp., Corycaeus spp. and Oncaea spp., and the harpacticoid Microsetella spp. were found.

show abstract

Design and calibration of a new optical plankton counter capable of sizing small zooplankton

Cited by 185 publications

References 5 publications

Mesoscale subduction at the Almeria–Oran front

Mesoscale subduction at the Almeria–Oran front

Large versus small zooplankton in relation to temperature in the Arctic shelf region

Epipelagic mesozooplankton distribution and abundance over the Mascarene Plateau and Basin, south-western Indian Ocean

Contact Info

Product

Resources

About