Dataset: HADES-K Sediment Macrofaunal Diversity
Deployment: TN309

HADES-K - macrofauna 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/763704/data

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Description

This dataset includes raw counts of macrofauna families 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 (HADES-K), 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.

The 0-1, 1-2, 2-3, 3-5, 5-10 cm depth horizons were sectioned for all cores.

Macrofauna (>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
SampleYear	year of sampling	unitless	year
Station	station identifier	unitless	station
DateCollected	collection date	unitless	date
Gear	type of collection gear	unitless	instrument
USGS_CoreID	USGS core sample identifier	unitless	sample
Site	site name	unitless	site
SampleType1	type of sample	unitless	sample_type
Location	location code	unitless	site
Fraction	core fraction??	centimeters	depth_core
SieveSize	sieve mesh size	microns	net_mesh
CoreDiameter	core diameter	centimeters	diameter
CoreArea	cross-sectional area of core	centimeters^2	surface_area
Latitude	latitude; north is postivie	degrees	lat
Longitude	longitude; east is postivie	degrees	lon
Depth	sample depth below sea surface	meters	depth
NIWA_id	National Institute for Water and Atmosphere (NIWA) sample identifier	unitless	sample
ACROCIRRIDAE	Number of Acrocirridae identified in sample	individuals	taxon
AMPHARETIDAE	Number of Ampharetidae identified in sample	individuals	taxon
CIRRATULIDAE	Number of Cirratulidae identified in sample	individuals	taxon
FLABELLIGERIDAE	Number of Flabelligeridae identified in sample	individuals	taxon
NEPHTYIDAE	Number of Nephtyidae identified in sample	individuals	taxon
OWENIIDAE	Number of Oweniidae identified in sample	individuals	taxon
PARAONIDAE	Number of Paraonidae identified in sample	individuals	taxon
SYLLIDAE	Number of Syllidae identified in sample	individuals	taxon
TEREBELLIDAE	Number of Terebellidae identified in sample	individuals	taxon
Unknown_Polychaete	Number of Unknown polychaete identified in sample	individuals	taxon
Naididae	Number of Naididae identified in sample	individuals	taxon
Enchytraeidae	Number of Enchytraeidae identified in sample	individuals	taxon
BIVALVIA	Number of Bivalvia identified in sample	individuals	taxon
SIPUNCULA	Number of Sipuncula identified in sample	individuals	taxon
Unknown_Individuals	Number of unidentified individuals in sample	individuals	taxon

Database

Contribute Data

Dataset: HADES-K Sediment Macrofaunal Diversity
Deployment: TN309

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: HADES-K Sediment Macrofaunal DiversityDeployment: TN309

Dataset acquisition description

Dataset Processing Description

Dataset: HADES-K Sediment Macrofaunal Diversity
Deployment: TN309