Dataset: 2018 Ross Sea Zooplankton Abundance: IKMT

Name: Zooplankton abundance from Isaacs-Kid Midwater Trawl (IKMT) hauls from RVIB Nathaniel B. Palmer NBP1801 in the Ross Sea, Jan.-Feb. 2018
Published: 2020-05-11
Keywords: Ross Sea, zooplankton abundance, biota, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.792385.4

Spatial Extent: N:-74.7731 E:172.9985 S:-76.7504 W:164.1588

Temporal Extent: 2018-01-10 - 2018-02-16

Project:

Using Bio-acoustics on an Autonomous Surveying Platform for the Examination of Phytoplankton-zooplankton and Fish Interactions in the Western Ross Sea (bio-acoustic plankton surveys)

Principal Investigator:

Grace Saba (Rutgers University)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2020-05-11

Restricted:

Release Date:

2020-02-13

Validated:

Yes

Current State:

Final no updates expected

Zooplankton abundance from Isaacs-Kid Midwater Trawl (IKMT) hauls from RVIB Nathaniel B. Palmer NBP1801 in the Ross Sea, Jan.-Feb. 2018

Abstract:

Isaacs-Kid Midwater Trawl (IKMT) hauls were conducted during the R/V Nathaniel B. Palmer cruise NBP18-01 in Jan-Feb 2018. These data represent the zooplankton species and abundance analysis resulting from these sample collections. A companion dataset of ring net tow abundances is also available.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2020-05-11	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.792385.4	2020-05-20
2020-04-29	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.792385.3	2020-04-29
2020-04-27	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.792385.2	2020-04-27
2020-02-10	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.792385.1	2020-02-13

Description

Methods & Sampling

Sample collection: Net tows and mid-water trawls were conducted in the western Ross Sea, Antarctica on board the R/V Nathaniel B. Palmer in January-February 2018 (cruise number 18-01). Both the ring net (1 m diameter, 333 um mesh, non-filtering cod end) and the Issacs-Kidd Midwater Trawl (IKMT, 1.8 m frame, 500 um mesh, non-filtering cod end) were fitted with a calibrated General Oceanics flow meter. Contents of each tow were concentrated and preserved with buffered formaldehyde (4% final concentration) in 500 ml wide-mouth glass jars. Samples were sent back to the home laboratory (Rutgers University) for analysis.

Analyses: Contents of each tow (or a subsample if the density of zooplankton or fish was high) were sorted by taxa and, in some cases, developmental stage. Measurements for abundance were conducted using a dissecting microscope (Zeiss Discovery.V8).

Volume of water (cubic meter) that passed through the net/trawl during each tow was calculated using flowmeter rotor constant, flowmeter start and end values, and the area of net opening.

Abundance per cubic meter per tow/trawl was then calculated for each species and, in some cases, developmental stage, by dividing the number of individuals for each species/developmental stage by the volume of water.

Data Processing Description

BCO-DMO Processing Notes:
version 1:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- in Method column, replaced commas with semicolons
- converted latitudes and longitudes to decimal degrees
- two columns were named 'Latitude end'; renamed second one 'lon_end_decdeg' as it's clearly a longitude.
- reformatted start and end date and times to ISO-format (from m/d/yy to yyyy-mm-ddTHH:MM:SSZ)
version 2:
- same as v1 - changes didn't 'take'.
version 3:
- corrected ISO_DateTime_UTC by removing an extra ":00" at end of the string (eg. 2018-01-10T02:04:00:00Z)
version 4:
- revised volume filtered and zooplankton abundance values.

Data Files

File
ikmt_abund.csv (Comma Separated Values (.csv), 3.25 KB) MD5:cbe14892833d8e698bbf074d8737f3e0 Primary data file for dataset ID 792385

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1743035

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
NBP1801	CICLOPS Cobalamin and Iron Co-Limitation Of Phytoplankton Specie	2017-12-16	RVIB Nathaniel B. Palmer	Giacomo DiTullio (Chief Scientist) Robert B. Dunbar (Co-Chief Scientist) Grace Saba (Scientist)	data info

Instruments

Isaacs-Kidd Midwater Trawl

Supplied Name: Isaacs-Kid Midwater Trawl

Supplied Description:

Rectangle framed net (1.8 m x 1.8 m) with 500 um mesh and a non-filtering cod end. Used to collected zooplankton during the Ross Sea cruise.

Instrument Type

Generic Name: Isaacs-Kidd Midwater Trawl

Acronym: IKMT

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0071/

Generic Description:

A trawl with a pentagonal mouth opening and a dihedral depressor vane as part of the mouth opening. IKMTs come in various dimensions (refer to individual dataset documentation).

The original IKMTs were 10 foot (304 cm) and 15 foot (457 cm) at the mouth. The 10 foot IKMT net was 31 feet (9.45 m) in length (Wiebe and Benfield 2003).

Microscope - Optical

Supplied Name: Zeiss Discovery V8 Dissecting microscope

Supplied Description:

Optical microscope with magnification for observation of the Ross Sea cruise tow/trawl samples. Used to taxonomically identify and count collected zooplankton during the Ross Sea cruise.

Instrument Type

Generic Name: Microscope - Optical

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB05/

Generic Description:

Instruments that generate enlarged images of samples using the phenomena of reflection and absorption of visible light. Includes conventional and inverted instruments. Also called a "light microscope".

Ring Net

Supplied Name: ring net

Supplied Description:

Plankton net with 1 m diameter, 333 um mesh, non-filtering cod end. Used to collected zooplankton during the Ross Sea cruise.

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

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Method	Collection method specified; either a 1-m diameter ring net with 333um mesh or an Isaacs Kidd Midwater Trawl with a 1.8-m frame	unitless	instrument
Tow_Trawl_number	Tow/Trawl number provided in chronological order during the cruise	unitless	tow
ISO_DateTime_UTC_start	UTC date and time the tow/trawl started; ISO formatted	yyyy-MM-dd'T'HH:mm:ss'Z'	time_start
ISO_DateTime_UTC_end	UTC date and time the tow/trawl ended; ISO formatted: YYYY-MM-DDTHH:MM:SSZ	unitless	time_end
lat_start_decdeg	Latitude/Location where the tow/trawl started	decimal degrees	lat_start
lon_start_decdeg	Longitude/Location where the tow/trawl started	decimal degrees	lon_start
lat_end_decdeg	Latitude/Location where the tow/trawl ended	decimal degrees	lat_end
lon_end_decdeg	Longitude/Location where the tow/trawl ended	decimal degrees	lon_end
Net_depth_m	Water depth the ring net or trawl were towed	meters	depth
Bottom_depth_m	Water depth at location of tow/trawl	meters	depth_w
SST_deg_C	Sea Surface Temperature at time and location of tow/trawl	Degrees Celsius	SST
Flowmeter_start	Calibrated General Oceanics flowmeter reading at start of tow/trawl; used in calculations for water volume that passed through the net/trawl	unitless	flow
Flowmeter_end	Calibrated General Oceanics flowmeter reading at end of tow/trawl; used in calculations for water volume that passed through the net/trawl	unitless	flow
Volume_m3	Volume of water that passed through the net/trawl; calculated using flowmeter data and area of net opening	cubic meters	vol_filt
Euphausiids_Euphausia_crystallorophias	Abundance of Euphausia crystallorophias	number/meter^3	abundance
Ecrystallorophias_small_juveniles	Abundance of E crystallorophias small juveniles	number/meter^3	abundance
Euphausia_superba	Abundance of Euphausia superba	number/meter^3	abundance
Thysanoessa_macrura	Abundance of Thysanoessa macrura	number/meter^3	abundance
Amphipods_Vibilia_stebbingi	Abundance of Vibilia stebbingi	number/meter^3	abundance
Primno_macropa	Abundance of Primno macropa	number/meter^3	abundance
Themisto_gaudichaudii	Abundance of Themisto gaudichaudii	number/meter^3	abundance
Hyperoche_sp	Abundance of Hyperoche sp.	number/meter^3	abundance
Eusirus_sp	Abundance of Eusirus sp.	number/meter^3	abundance
Chaetognaths_Pseudosagitta	Abundance of Pseudosagitta	number/meter^3	abundance
Pteropods_Limacina_rangii	Abundance of Limacina rangii	number/meter^3	abundance
Clione_limacina_antarctica	Abundance of Clione limacina antarctica	number/meter^3	abundance
Spongiobranchaea_australis	Abundance of Spongiobranchaea australis	number/meter^3	abundance
Fish_Pleuragramma_antarctica_adult_juv	Abundance of Pleuragramma antarctica adults and juveniles	number/meter^3	abundance
Pleuragramma_antarctica_larvae	Abundance of Pleuragramma antarctica larvae	number/meter^3	abundance
Channichthyidae	Abundance of Channichthyidae	number/meter^3	abundance
Decapods_Notocrangon_antarcticus	Abundance of Notocrangon antarcticus	number/meter^3	abundance
Other_Polychaeta	Abundance of other Polychaeta	number/meter^3	abundance
Ctenaphora	Abundance of Ctenaphora	number/meter^3	abundance
Medusae	Abundance of Medusae	number/meter^3	abundance

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Dataset: 2018 Ross Sea Zooplankton Abundance: IKMT