Dataset: Neocalanus Multinet

Name: Neocalanus distribution, mean length, mean weight, abundance and biomass from the Gulf of Alaska , Fall 2015, 2016 and 2017
Published: 2021-06-02
Keywords: zooplankton, Calanus, egg production, prosome length, Alaska, abundance, biomass, oceans

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Spatial Extent: N:60.5402 E:-147.507 S:57.7883 W:-147.995

Temporal Extent: 2015-09-20 - 2017-09-21

Project:

Collaborative Proposal: Optimizing Recruitment of Neocalanus copepods through Strategic Timing of Reproduction and Growth in the Gulf of Alaska (Neocalanus Gulf of Alaska)

Principal Investigator:

Russell R. Hopcroft (University of Alaska Fairbanks, UAF)

Co-Principal Investigator:

Petra H. Lenz (University of Hawaii at Manoa, SOEST)

Contact:

Russell R. Hopcroft (University of Alaska Fairbanks, UAF)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-06-02

Restricted:

Validated:

Current State:

Preliminary and in progress

Neocalanus distribution, mean length, mean weight, abundance and biomass from the Gulf of Alaska , Fall 2015, 2016 and 2017

Abstract:

Neocalanus distribution, mean length, mean weight, abundance and biomass from the Gulf of Alaska, Fall 2015, 2016 and 2017

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Description

Notes: In 2015 a 505um mesh was utilized on the multinet however in 2016 and 2017 a 150 um mesh was employed. The Neocalanus copepods are above the capture efficiency for both nets and no bias is introduced because of the different methodology

Methods & Sampling

Zooplankton samples were collected from the Gulf of Alaska (Seward Line) in September 2015, 2016 and 2017 using a vertically hauled MultiNet (0.25 m2 MIDI) equipped with a 505um mesh in 2015 and a 150 um mesh in 2016 and 2017. Depth strata sampled were 0-100m, 100-200m, 200-300m, 300-400 and 400-700m. The samples were immediately preserved in 10% formalin

For analysis each sample was poured into a sorting tray where large organisms, primarily shrimp and jelly fish, were removed. The sample was then sequentially split using a Folsom splitter until a subsample containing approximately 100 specimens of Neocalanus copepods was obtained. The individual organisms were identified to species, staged, and the prosome length was measured using a computer based program interfaced to a digitizing tablet . Dry weights were calculated from literature length- weight equations. Abundance and biomass were calculated for each taxon and tabulated using EXCEL

Data Processing Description

In EXCEL Abundance and biomass calculations were merged with the ship event logs for date.time, latitude and longitude and formatted for export (csv).

BCO-DMO Processing Notes:

Adjusted column names to comply with database requirements

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1459826

Deployments

Deployment	Start Date	Platform	Investigator
TXF15	2015-09-09	R/V Tiglax	Russell R. Hopcroft (Chief Scientist)	data info
TXF16	2016-09-16	R/V Tiglax	Russell R. Hopcroft (Chief Scientist)	data info
TXF17	2017-09-09	R/V Tiglax	Russell R. Hopcroft (Chief Scientist)	data info

Instruments

Mechanical Flowmeter

Supplied Name: General Oceanics flowmeters

Supplied Description:

General Oceanics flowmeters were employed to calculate volume of water filtered by the net

Instrument Type

Generic Name: Mechanical Flowmeter

Generic Description:

Manufactured by General Oceanics, a mechanical flow meter is used with plankton tows to determine the volume of water which flows through the net. Flow meters are also used in rivers, estuaries, canals, sewer outfalls, pipes, and harbor entrances to determine water velocity and flow distance information.

MultiNet

Supplied Name: MultiNet (MIDI)

Supplied Description:

0.25m2 MultiNet (MIDI) equipped with a 150 or 505 um mesh

Instrument Type

Generic Name: MultiNet

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0099/

Generic Description:

The MultiNet© Multiple Plankton Sampler is designed as a sampling system for horizontal and vertical collections in successive water layers. Equipped with 5 or 9 net bags, the MultiNet© can be delivered in 3 sizes (apertures) : Mini (0.125 m2), Midi (0.25 m2) and Maxi (0.5 m2). The system consists of a shipboard Deck Command Unit and a stainless steel frame to which 5 (or 9) net bags are attached by means of zippers to canvas. The net bags are opened and closed by means of an arrangement of levers that are triggered by a battery powered Motor Unit. The commands for actuation of the net bags are given via single or multi-conductor cable between the Underwater Unit and the Deck Command Unit. Although horizontal collections typically use a mesh size of 300 microns, mesh sizes from 100 to 500 may also be used. Vertical collections are also common. The shipboard Deck Command Unit displays all relevant system data, including the actual operating depth of the net system.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise Designation RV Tiglax TXYY	unitless	cruiseid
DateTime	Date and time of sample collection mm/dd/yyyy hh:mm ( Local Time) Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Station	The name of the sampling location	unitless	site
Latitude	The latitude of the sampling location	decimal degrees	lat
Longitude	The longitude of the sampling location	decimal degrees	lon
NetNo	The multinet number	unitless	instrument
MaximumDepth	The maximum depth of the gear deployment	meters (m)	depth
MinimumDepth	The minimum depth of the gear deployment	meters (m)	depth
APHIAID	The APHIA id number given to the identified organism (per worms www.marinespecies.org as of 2020)	unitless	taxon_code
ScientificName	The scientific name of the identified organism	unitless	species
LifeStage	The life stage or copepodite stage of the organism. stages 1-5 copepodite stages 1-5 ; F- Female; M-male	unitless	stage
Abundance	The abundance of the organism	(#/m3)	abundance
MeanLength	The mean prosome length of the organism	(um)	length
MeanDryWeight	The mean dry weight of the organism	(ug)	dry_wgt_globec
Biomass	The biomass of the organism	(mgDW/m3)	wet_weight_biomass
Comment	Notes or comments pertaining to the identification or condition of the organism	units	comment

Database

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Dataset: Neocalanus Multinet