Dataset: HADES-K Sediment Meiofaunal Diversity
Deployment: TN309

HADES-K - meiofauna raw counts

Principal Investigator:

Timothy M. Shank (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Jeffrey C. Drazen (University of Hawaiʻi at Mānoa, SOEST)

Paul Yancey (Whitman College)

BCO-DMO Data Manager:

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

Project:

Controls on Hadal Megafaunal Community Structure: a Systematic Examination of Pressure, Food Supply, and Topography (HADES)

Deployment Synonyms:

HADES-K, HADESK

Data URL:

https://www.bco-dmo.org/dataset-deployment/763765/data

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Description

This dataset includes raw counts of meiofauna identified in push core samples taken in the Kermadec Trench in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309, May 2014.

Methods & Sampling

Dataset acquisition description

Push cores (6.35 cm diameter) of sediment were collected in situ using the manipulator arm of the Hybrid Remotely Operated Vehicle Nereus on the margin of the Kermadec Trench (6013m) and along the main trench axis (7137 to 9177m) at roughly 1000m increments.

Cores were sectioned at 1cm intervals and sieved for the meiofaunal fraction.

Meiofauna (>300 microns) were enumerated and identified to major taxonomic groups (16 total) based on the published morphological descriptions of the taxonomic groups. The data present the total number of individuals in each of these groups in each core.

Attempts were made to obtain 3 replicate cores at each depth horizon (every 1000 meters from 6000m to 10,000m. For logistical reasons with vehicle performance (and loss at 10,000), all of the replicates were not able to be collected.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- re-formatted date from m/d/yyyy to yyyy-mm-dd

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1131620	NSF Division of Ocean Sciences

Instruments

HROV Nereus

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: HROV Nereus

Generic Description:

Nereus is an efficient, multi-purpose “hybrid” vehicle that can explore and operate in the crushing pressures of the greatest ocean depths. An unmanned vehicle, Nereus operates in two complementary modes. It can swim freely as an autonomous underwater vehicle (AUV) to survey large areas of the depths, map the seafloor, and give scientists a broad overview. When Nereus locates something interesting, the vehicle’s support team can bring the vehicle back on board the ship and transforms it into a remotely operated vehicle (ROV) tethered to the ship via a micro-thin, fiber-optic cable. Through this tether, Nereus can transmit high-quality, real-time video images and receive commands from skilled pilots on the ship to collect samples or conduct experiments with a manipulator arm.

Technical specifications:

Weight on land: 2,800 kg
Payload capacity: 25 kg
Maximum speed: 3 knots
Batteries: rechargable lithium ion, 15 kilowatt hours in two pressure housings
Thrusters: 2 fore and aft, 2 vertical, 1 lateral (ROV mode) 2 fore and aft, 1 vertical (AUV mode)
Lights: variable output LED array, strobes
Manipulator arm: Kraft TeleRobotics 7-function hydraulic manipulator
Sonar: scanning sonar, forward look and profile, 675 KHz
Sensors: magnetometer, CTD (to measure conductivity, temperature, and depth)

Nereus supports a variety of science operations: Push coring, measuring heat flow, geotechnical and geochemical sensing, rock sampling and drilling, biological sampling, water sampling, high resolution acoustic bathymetry, and optical still and video imagery.

More information is available from the operator site at URL.

Microscope - Optical

Supplied Name: Leica MZ APO stereo microscopes

Supplied Description:

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".

Push Corer

Supplied Name:

Supplied Description:

Push cores were borrowed from the National Deep Submergence Facility to be able to standardize results. The push cores were 6.35cm diameter).

Instrument Type

Generic Name: Push Corer

Generic Description:

Capable of being performed in numerous environments, push coring is just as it sounds. Push coring is simply pushing the core barrel (often an aluminum or polycarbonate tube) into the sediment by hand. A push core is useful in that it causes very little disturbance to the more delicate upper layers of a sub-aqueous sediment.

Description obtained from: http://web.whoi.edu/coastal-group/about/how-we-work/field-methods/coring/

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
USGS_SampleID	USGS sample identifier	unitless	sample
Station	station identifier	unitless	station
Site	site name	unitless	site
Location	location code	unitless	site
Depth	sample depth below sea surface	meters	depth
DateCollected	collection date	unitless	date
Latitude	latitude; north is postivie	degrees	lat
Longitude	longitude; east is postivie	degrees	lon
Overall_Sample_Progress	status of sorting: complete or not started	unitless	comment
USGS_CoreID	USGS core sample identifier	unitless	sample
Fraction	core fraction??	centimeters	depth_core
SieveSize	sieve mesh size	microns	net_mesh
NIWA_id	NIWA sample identifier	unitless	sample
ANNELIDA	Number of Annelida identified in sample	individuals	taxon
ARTHROPODA	Number of Arthropoda identified in sample	individuals	taxon
Crustacea	Number of Crustacea identified in sample	individuals	taxon
Amphipoda	Number of Amphipoda identified in sample	individuals	taxon
Copepoda	Number of Copepoda identified in sample	individuals	taxon
Isopoda	Number of Isopoda identified in sample	individuals	taxon
Ostracoda	Number of Ostracoda identified in sample	individuals	taxon
Kinorhyncha	Number of Kinorhynch identified in samplea	individuals	taxon
Bivalvia	Number of Bivalvia identified in sample	individuals	taxon
Gastropoda	Number of Gastropoda identified in sample	individuals	taxon
Sipuncula	Number of Sipuncula identified in sample	individuals	taxon
Nematoda	Number of Nematoda identified in sample	individuals	taxon
Loricifera	Number of Loricifera identified in sample	individuals	taxon
Tardigrada	Number of Tardigrada identified in sample	individuals	taxon
Gastrotricha	Number of Gastrotricha identified in sample	individuals	taxon
Unknown_Individuals	Number of unidentified individuals in sample	individuals	taxon

Database

Contribute Data

Dataset: HADES-K Sediment Meiofaunal Diversity
Deployment: TN309

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: HADES-K Sediment Meiofaunal DiversityDeployment: TN309

Dataset acquisition description

Dataset Processing Description

Dataset: HADES-K Sediment Meiofaunal Diversity
Deployment: TN309