Dataset: Pyrosomes - MOCNESS
Deployment: SKQ201804S

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/866663

Principal Investigator:

Kelly Rakow Sutherland (University of Oregon)

Co-Principal Investigator:

Robert K. Cowen (Oregon State University, OSU-HMSC)

Su Sponaugle (Oregon State University, OSU-HMSC)

Contact:

Joanna Lyle (University of Oregon, OIMB)

BCO-DMO Data Manager:

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

Project:

Collaborative Research: Mesozooplankton food webs in intermittent upwelling systems: An overlooked link in a productive ocean (MEZCAL)

Version:

Deployment Synonyms:

W18

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Description

These data were published in Lyle, J.T. et al. Table II

Methods & Sampling

Dataset acquisition description

Pyrosoma atlanticum colonies were collected from coupled Multiple Opening and Closing Environmental Sensing System (MOCNESS) tows (Guigand et al., 2005). The nets had openings of 1 m2 and 4 m2 with mesh sizes of 333 µm and 1000 µm, respectively. The pair of nets sampled to 100 m depth in four separate 25-m bins, and a fifth net (“net 0”) was towed to 100 m during the downcast. Pyrosome colonies in each net were enumerated and their volume measured by displacement. Biovolume (mL•m-3) was calculated by dividing the total pyrosome volume by the volume of water sampled in that tow. If pyrosomes were too numerous to count, a subset of 20 from each depth bin were measured for biovolume. Colony lengths were only measured during July 2018.

Multiple Opening/Closing Net and Environmental Sensing Systems (MOCNESS) fitted with a 4 m2 net with 1 mm mesh and a 1 m2 net with 333 µm mesh.

Data Processing Description

Dataset Processing Description

Pyrosome abundance and biovolume were processed in Excel (v.16.16.4). MOCNESS filtered volumes were sourced from this dataset: https://www.bco-dmo.org/dataset/783036

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1737364	NSF Division of Ocean Sciences
OCE-1737399	NSF Division of Ocean Sciences

Instruments

MOCNESS

Supplied Name: Multiple Opening/Closing Net and Environmental Sensing Systems (MOCNESS)

Supplied Description:

Multiple Opening/Closing Net and Environmental Sensing Systems (MOCNESS) fitted with a 4 m2 net with 1 mm mesh and a 1 m2 net with 333 µm mesh.

Instrument Type

Generic Name: MOCNESS

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. There are currently 8 different sizes of MOCNESS in existence which are designed for capture of different size ranges of zooplankton and micro-nekton Each system is designated according to the size of the net mouth opening and in two cases, the number of nets it carries. The original MOCNESS (Wiebe et al, 1976) was a redesigned and improved version of a system described by Frost and McCrone (1974).(from MOCNESS manual) This designation is used when the specific type of MOCNESS (number and size of nets) was not specified by the contributing investigator.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise identification number: S=summer; W=winter; 18=2018	unitless	cruise_id
Location	Sampling location: NH=Newport, OR; TR=Trinidad Head, CA	unitless	sta_id
Station	Location along transect: 1=closest nearshore; 5=furthest offshore; D=day; N=night	unitless	sta_id
Transect	Sampling transect: Ma=first transect; Mb=second transect	unitless	transect
Date_Time_UTC	Date and time of the start of the net towing in UTC time zone	yyyy-mm-dd hh:mm:ss	ISO_DateTime_UTC
Latitude	Latitude of tow start location, north is positive	decimal degrees	lat
Longitude	Longitude of tow start location, west is negative	decimal degrees	lon
Moc_size	Size of net for sample: 1=1m2 with 333um mesh; 4=4m2 with 1mm mesh	m^2	net_mesh
Net_number	Net open on MOCNESS: 0=oblique; 1=100-75m, 2=75-50m, 3=50-25m, 4=25-0m	unitless	net_mesh
Vol_filtered	Filtered volume during tow	m^3	vol_filt
Total_pyrosome_vol	Total volume of pyrosomes (Pyrosoma atlanticum) from net tow, measured by displacement	mL	sample_volume
Total_count	Total number of pyrosomes (Pyrosoma atlanticum) from net tow	count	count
Subsample_count	Number of pyrosomes (Pyrosoma atlanticum) used for subsample	count	count
Subsample_vol	Volume of pyrosomes (Pyrosoma atlanticum) in subsample, measured by displacement	mL	sample_volume
Est_total_count	Estimated total count of pyrosomes (Pyrosoma atlanticum), calculated for samples where total count is unknown	count	count
Abundance	Abundance of pyrosomes (Pyrosoma atlanticum) from net tow	count/m^3	abundance
Biovolume	Volume of pyrosomes (Pyrosoma atlanticum) per filtered volume during tow	ml/m^3	biovolume
Colony_ID	Unique identifier for individual pyrosome colonies collected from net tows for length measurement. The field may be left blank if no colony lengths were measured.	unitless	sample
Length	Length of Pyrosoma atlanticum colony in cm recorded from each net tow. No lengths were recorded on W18 cruise	cm	length

Database

Contribute Data

Dataset: Pyrosomes - MOCNESS
Deployment: SKQ201804S

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Pyrosomes - MOCNESSDeployment: SKQ201804S

Dataset acquisition description

Dataset Processing Description

Dataset: Pyrosomes - MOCNESS
Deployment: SKQ201804S