Dataset: GoM WBTS 2012-2013 Calanus finmarchicus abundance
Deployment: GC_GoM_2012-2013

Calanus finmarchicus stages abundance from 200um vertical ring nets TimeSeries stations

Chief Scientist:

Jeffrey A. Runge (University of Maine)

Principal Investigator:

Jeffrey A. Runge (Gulf of Maine Research Institute, GMRI)

Contact:

Cameron Thompson (Gulf of Maine Research Institute, GMRI)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

RAPID: Effect of a Very Low NAO Event on the Abundance of the Lipid-Rich Planktonic Copepod, Calanus finmarchicus, in the Gulf of Maine (GoM_Calanus_2012-2013)

Current State:

Cruise complete

Version:

working

Version Date:

2015-01-14

Data URL:

https://www.bco-dmo.org/dataset-deployment/544853/data

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Description

Abundance of Calanus finmarchicus stages caught in 200um vertical ring nets(bottom to surface) at two time series stations in the Gulf of Maine (2012 - 2013).

Users are requested to consult with Jeffrey Runge prior to preparation of any manuscripts or reports, either written or online, that make use of zooplankton and hydrographic data originating from this study. The data are freely available without need for consultation with Dr. Runge after October, 2017.

Methods & Sampling

Dataset acquisition description

These deployments followed the AZMP protocols (Mitchell et al. 2002). Using a 0.75 meter diameter SEA-GEAR Model 9600 twin-ring, 200µm mesh net, two vertical casts were made to within 5 meters of the bottom at each station.

Two replicate samples from separate casts were preserved in a 4% seawater-buffered formaldehyde solution. In the laboratory, all formalin preserved zooplankton samples were split in half using a Folsom Plankton Splitter. Half of the sample was archived for identification and enumeration of zooplankton, and the other half was processed for biomass determination. To estimate abundances the archival split was diluted and sub-sampled with a 5 mL Stempel pipette. Depending on abundance in the sample, multiple subsamples were taken until a target number of 75-150 C. finmarchicus copepodids were enumerated and staged and in addition at least 200 specimens in total were counted and identified to the lowest possible taxa.

Mitchell, M. R., G. Harrison, K. Pauley, A. Gagné, G. Maillet, and P. Strain. (2002) Atlantic Zonal Monitoring Program Sampling Protocol. Canadian Technical Report of Hydrography and Ocean Sciences 223.

Data Processing Description

Dataset Processing Description

The counts were normalized to abundance (number m-2), taking into account the subsample dilution, the split, and volume sampled by the net at the station. Because of unreliable flowmeter readings, we calculated volume filtered by the net from net area and net depth. The filtered volume calculated geometrically, as we have done here, is closely related to the flowmeter volume when flowmeters were working properly.

Volume = Net Depth * Net Area

Abundance (number m-2) = ( (count*Dilution Factor / Archival split) / Volume) *Station Depth

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1235920	NSF Division of Ocean Sciences

Instruments

Ring Net

Supplied Description:

0.75 meter diameter, SEA-GEAR Model 9600 twin-ring, 200um mesh net

Instrument Type

Generic Name: Ring Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/22/

Generic Description:

A Ring Net is a generic plankton net, made by attaching a net of any mesh size to a metal ring of any diameter. There are 1 meter, .75 meter, .25 meter and .5 meter nets that are used regularly. The most common zooplankton ring net is 1 meter in diameter and of mesh size .333mm, also known as a 'meter net' (see Meter Net).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise	each deployment has its own cruise ID following this format: GC for R/V Gulf Challenger; followed by the date (mmddyy)	text	cruise_id
station	WB-5 or WB-7	text	station
site	either Jeffreys Ledge (WB-5) or Wilkinson Basin (WB-7)	text	site
lat	latitude	decimal degrees; North is positive	lat
lon	longitude	decimal degrees; West is negative	lon
date_local	date local time	mmddyyyy	date_local
month_local	month local time	mm	month_local
day_local	day local time	dd	day_local
year	year	yyyy	year
depth_net	depth of the ring net according to length of wire out of the winch; as read by a meter wheel	meters	depth
depth_station	water depth at the station according to depth sounder on vessel	meters	depth_w
num_ided	number of Calanus finmarchicus (including nauplii) that were counted and staged during analysis of the sample	integer	number
dil_factor	water volume the sample is diluted into / volume of water subsampled	number	no_bcodmo_term
nauplii	abundance of all naupliear stages in water column; note that the 200um mesh would let many young stages through	number per m2	abundance
stage_CI	abundance of copepodid stage 1	number per m2	abundance
stage_CII	abundance of copepodid stage 2	number per m2	abundance
stage_CIII	abundance of copepodid stage 3	number per m2	abundance
stage_CIV	abundance of copepodid stage 4	number per m2	abundance
stage_CV	abundance of copepodid stage 5; pre-adult stage	number per m2	abundance
female	abundance of females(copepodid stage 6) in water column	number per m2	abundance
male	abundance of males (copepodid stage 6)	number per m2	abundance
yrday_local	day of year local time	number	yrday_local

Database

Contribute Data

Dataset: GoM WBTS 2012-2013 Calanus finmarchicus abundance
Deployment: GC_GoM_2012-2013

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GoM WBTS 2012-2013 Calanus finmarchicus abundanceDeployment: GC_GoM_2012-2013

Dataset acquisition description

Dataset Processing Description

Dataset: GoM WBTS 2012-2013 Calanus finmarchicus abundance
Deployment: GC_GoM_2012-2013