Dataset: BONGO - Zooplankton
Deployment: NH1008

BONGO net tow zooplankton abundance estimates

Principal Investigator:

David M. Checkley (University of California-San Diego Scripps, UCSD-SIO)

Co-Principal Investigator:

Michael Dagg (Louisiana Universities Marine Consortium, LUMCON)

George A. Jackson (Texas A&M University, TAMU)

Contact:

David M. Checkley (University of California-San Diego Scripps, UCSD-SIO)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Zooplankton feeding at the base of the particle maximum: Gatekeepers of the Vertical Flux? (GATEKEEPERS)

Current State:

Preliminary and in progress

Version:

24 November 2014

Deployment Synonyms:

GATEKEEPERS

Version Date:

2014-11-24

Data URL:

https://www.bco-dmo.org/dataset-deployment/540949/data

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Description

The abundance (# m^-3, ppm) for selected taxa in each analyzed BONGO deployment.

Related reference:
Dagg, M.J., G.A. Jackson, and D.M. Checkley, Jr. (in press). The distribution and vertical flux of fecal pellets from large zooplankton in Monterey Bay and coastal California." Deep-Sea Research Part I.

Methods & Sampling

Dataset acquisition description

Sample Collection:
Samples were collected using a 71-cm diameter Bongo net with 505-micron-mesh nets with calibrated flow meter. Tow speed was generally 0.5-1 m sec^-1. Wire angle and wire out were used to conduct oblique tows from the surface to 100m to the surface.

Data Processing Description

Dataset Processing Description

Sample Analysis:
Samples were split multiple times using a Folsom splitter. Specific taxa were identified and enumerated in one or more splits using a dissecting microscope. Equivalent spherical diameter (ESD) was estimated from length and width and assuming a geometric shape for discretely sized taxa (Calanus pacificus adult females, adult males, and fifth copepodites: C.pac AF, AM, C5; Metridia pacifica adult females: M.pac AF; Euclanus californicus adult males, adult females, and fourth and fifth copepodites: E.cal AF, AM, C4,C5). For other taxa (other large cops, euphausiids, and small zooplankton), mean ESD was calculated when present. Mean volume was calculated from mean ESD for each taxon using the equation ⅙π (mean ESD)³. Abundance of each taxon was calculated by multiplying counts by their corresponding split factors and dividing by the sum volume filtered. Mean volume was multiplied by abundance for each taxon to calculate volume in cm³m^-3 or ppm. Number of individuals measured and counted in each taxonomic group was retained to display where low counts produce uncertainty in calculations.

BCO-DMO Processing Notes
- Generated from original file: "NH1008_BG_zoop_16sept13_jfb_no_header.xlsx" contributed by David Checkley
- Parameter names edited to conform to BCO-DMO naming convention found at Choosing Parameter Name
- "BONGO_" pre-pended to Tow Id for consistency with BONGO stations tow ids
- Date/Time and Lat/Lon deployed added to each record from BONGO stations to enable use in MapServer

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0927863	NSF Division of Ocean Sciences
OCE-0928139	NSF Division of Ocean Sciences
OCE-0928425	NSF Division of Ocean Sciences

Instruments

Bongo Net

Supplied Description:

Samples were collected using a 71-cm diameter Bongo net with 505-micron-mesh nets with calibrated flow meter. Tow speed was generally 0.5-1 m sec-1. Wire angle and wire out were used to conduct oblique tows from the surface to 100m to the surface.

Instrument Type

Generic Name: Bongo Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0009/

Generic Description:

A Bongo Net consists of paired plankton nets, typically with a 60 cm diameter mouth opening and varying mesh sizes, 10 to 1000 micron. The Bongo Frame was designed by the National Marine Fisheries Service for use in the MARMAP program. It consists of two cylindrical collars connected with a yoke so that replicate samples are collected at the same time. Variations in models are designed for either vertical hauls (OI-2500 = NMFS Pairovet-Style, MARMAP Bongo, CalVET) or both oblique and vertical hauls (Aquatic Research). The OI-1200 has an opening and closing mechanism that allows discrete "known-depth" sampling. This model is large enough to filter water at the rate of 47.5 m3/minute when towing at a speed of two knots. More information: Ocean Instruments, Aquatic Research, Sea-Gear

Folsom Plankton Splitter

Supplied Name: Folsom Splitter

Supplied Description:

Samples were split multiple times using a Folsom splitter.

Instrument Type

Generic Name: Folsom Plankton Splitter

Acronym: Folsom Splitter

Generic Description:

A Folsom Plankton Splitter is used for sub-sampling of plankton and ichthyoplankton samples.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Taxon	Taxon enumerated in respective net tow	text	taxon
BONGO_Tow	Sequential number of BONGO deployment	Dimensionless	tow
Date_Deployed	Deployment Date (PDT)	YYYYMMDD	date_start
Time_Deployed	Deployment Time (PDT)	HHMM	time_start
Latitude_Deployed	Deployment Latitude (South is negative)	decimal degrees	lat_start
Longitude_Deployed	Deployment Longitude (West is negative)	decimal degrees	lon_start
zl	Estimated deepest depth of tow	meters	depth_max
zu	Upper depth (in this case the surface)	meters	depth_min
Abund	Numerical abundance averaged over depth of tow	individuals m-3	abundance
Vol	Volumetric abundance averaged over depth of tow	ppm	abundance
Number_Measured	Number of individuals measured to estimate mean Equivalent Spherical Diameter (ESD)	individuals	count
Number_Counted	Number of individuals counted to estimate abundance	individuals	count

Database

Contribute Data

Dataset: BONGO - Zooplankton
Deployment: NH1008

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: BONGO - ZooplanktonDeployment: NH1008

Dataset acquisition description

Dataset Processing Description

Dataset: BONGO - Zooplankton
Deployment: NH1008