Dataset: HADES-K Nereus dives - geo-referenced megafauna counts
Deployment: TN309

HADES-K - georeferenced macrofauna

Principal Investigator:

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

Co-Principal Investigator:

Jeffrey C. Drazen (University of Hawaii at Manoa, 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/765663/data

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Description

This dataset includes geo-referenced megafaunal counts from the Kermadec Trench, April/May 2014. The dives were in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309 (HADES-K), April - May 2014.

Methods & Sampling

Dataset acquisition description

The HROV Nereus was used to conduct exploration and characterization (including downloading video seafloor transects) of the Kermadec Trench region in May 2014. Geo-referenced vehicle navigation was conducted using the R/V Thompson’s GPS launch position of the vehicle, the estimated initial on bottom position of the vehicle, the course over ground (determined by the Gyro heading, Doppler Velocity Profiler, and thruster speed).

The HROV transected between 1 and 5 meters off the seafloor, utilizing a down-looking Sony 4k HD camera system, in collaboration with the Advanced Imaging and Visualization Lab at the Woods Hole Oceanographic Institution. Megafauna was enumerated via direct counts from continuous video. Taxonomic identifications were based on comparison with published morphological characters when possible.

Nereus transect video was annotated using CADTV version 11 software and geo-referencing of continuous navigation was conducted via Matlab (2011 Release; MathWorks, Inc.) and Microsoft Excel for Mac 14.7.3.

Summary of HADES-K Nereus dives:

Nereus Dive #	Date	Mission Depth (m)	Dive Duration (hrs:min)	# of Transects	Bottom Duration (hrs:min)
64	4/14/2014	4000	12:00	1	6:41
72	5/2/2014	6060	17:19	4	9:28
73	5/4/2014	7000	18:04	2	8:09
74	5/5/2014	8100	19:57	1	10:07
75	5/8/2014	9000	13:44	0	2:16
76	5/10/2014	10,000	11:54	2	6:28

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes:- concatenated all the dive data into a single dataset
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- added columns for temp and altitude if not present in dive file
- added date_start, obtained from PI submission, differs somewhat from HadesK_deploylog dataset
- replaced blank cells with zeros to indicate that species were searched for but not found
- changed 'COS' column header to 'COG' in dives 72, 73, 74.

More information about this dataset deployment

Funding

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

Instruments

Camera

Supplied Name: Sony 4k HD Imaging System with Deep-Sea Power and Light LED lights

Supplied Description:

Instrument Type

Generic Name: Camera

Acronym: camera

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/311/

Generic Description:

All types of photographic equipment including stills, video, film and digital systems.

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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
dive	Nereus dive number	unitless	dive_id
Time2_GMT	time of dive (UTC) formatted as HH:MM:SS	unitless	time_utc
COG	Course Over Ground	degrees	cog
SOG	Speed Over Ground	knots	sog
Depth	pressure depth	meters	depth
Heading	compass vector degrees of the vehicle	degrees	heading
Temp	temperature	degrees Celsius	temp
Altitude	Doppler Velocity Log (2 beams)	meters	altitude
Distance	distance traveled; calculated using COS SOG and Heading	meters	no_bcodmo_term
Distance_x	distance in x direction; calculated using COS SOG and Heading	meters	no_bcodmo_term
Distance_y	distance in x direction; calculated using COS SOG and Heading	meters	no_bcodmo_term
Original_x	uncorrected x axis position using layback estimate from ship’s position	decimal degrees	no_bcodmo_term
Original_y	uncorrected y axis position using layback estimate from ship’s position	decimal degrees	no_bcodmo_term
New_x	corrected x axis position calculated using distance vector from previous position estimate	decimal degrees	no_bcodmo_term
New_y	corrected x axis position calculated using distance vector from previous position estimate	decimal degrees	no_bcodmo_term
Longitude	seafloor position calculated from New x and New y assuming on initial bottom position	decimal degrees	lon
Latitude	seafloor position calculated from New x and New y assuming on initial bottom position	decimal degrees	lat
Ophiuroid_sp1	number of Ophiuroid sp1 seen in image	organisms	count
Ophiuroid_sp2	number of Ophiuroid sp2 seen in image	organisms	count
Anemone_sp1	number of Anemone sp1 seen in image	organisms	count
Anemone_sp2	number of Anemone sp2 seen in image	organisms	count
Anemone_sp3	number of Anemone sp3 seen in image	organisms	count
Anemone_sp4	number of Anemone sp4 seen in image	organisms	count
Anemone_sp5	number of Anemone sp5 seen in image	organisms	count
Anemone_sp6	number of Anemone sp6 seen in image	organisms	count
Anemone_sp7	number of Anemone sp7 seen in image	organisms	count
Tube_Anemone_sp_1	number of Tube Anemone sp 1 seen in image	organisms	count
Holothurian_sp1	number of Holothurian sp1 seen in image	organisms	count
Holothurian_sp2	number of Holothurian sp2 seen in image	organisms	count
Holothurian_sp3	number of Holothurian sp3 seen in image	organisms	count
Holothurian_sp4	number of Holothurian sp4 seen in image	organisms	count
Holothurian_sp5	number of Holothurian sp5 seen in image	organisms	count
Holothurian_sp6	number of Holothurian sp6 seen in image	organisms	count
Holothurian_sp7	number of Holothurian sp7 seen in image	organisms	count
Holothurian_sp8	number of Holothurian sp8 seen in image	organisms	count
Asteroid_sp1	number of Asteroid sp1 seen in image	organisms	count
Asteroid_sp2	number of Asteroid sp2 seen in image	organisms	count
Asteroid_sp3	number of Asteroid sp3 seen in image	organisms	count
Amphipod_sp1	number of Amphipod sp1 seen in image	organisms	count
Amphipod_sp2	number of Amphipod sp2 seen in image	organisms	count
Polychaete_sp1	number of Polychaete sp1 seen in image	organisms	count
Polychaete_sp2	number of Polychaete sp2 seen in image	organisms	count
Polychaete_sp3	number of Polychaete sp3 seen in image	organisms	count
Polychaete_sp4	number of Polychaete sp4 seen in image	organisms	count
Polychaete_sp5	number of Polychaete sp5 seen in image	organisms	count
Polychaete_sp6	number of Polychaete sp6 seen in image	organisms	count
Polychaete_sp7	number of Polychaete sp7 seen in image	organisms	count
Stalked_Sponge_sp1	number of Stalked Sponge sp1 seen in image	organisms	count
Crinoid_sp1	number of Crinoid sp1 seen in image	organisms	count
Crinoid_sp2	number of Crinoid sp2 seen in image	organisms	count
Shrimp_sp1	number of Shrimp sp1 seen in image	organisms	count
Isopod_sp1	number of Isopod sp1 seen in image	organisms	count
Medusazoa_sp1	number of Medusazoa sp1 seen in image	organisms	count
Medusazoa_sp2	number of Medusazoa sp2 seen in image	organisms	count
Medusazoa_sp3	number of Medusazoa sp3 seen in image	organisms	count
Unknown_18_Xeno	number of Unknown 18 Xeno seen in image	organisms	count
Unknown_6_Enteropnuest	number of Unknown 6 Enteropnuest seen in image	organisms	count
unknown_plant_material	number of unknown plant material seen in image	organisms	count
date_start	Date at start of dive (UTC)	unitless	date_start

Database

Contribute Data

Dataset: HADES-K Nereus dives - geo-referenced megafauna counts
Deployment: TN309

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: HADES-K Nereus dives - geo-referenced megafauna countsDeployment: TN309

Dataset acquisition description

Dataset Processing Description

Dataset: HADES-K Nereus dives - geo-referenced megafauna counts
Deployment: TN309