Citation:

PANGAEA.975610

Name: Sediment characteristics of samples from the Chatham Rise, Southwest Pacific
Creator: Rachel Hale
Published: 2025-02-19
License: https://creativecommons.org/licenses/by/4.0/
Keywords: deep sea mining; Macrofauna; sediment; sediment community oxygen consumption

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Published: 2025-02-19 • DOI registered: 2025-03-20

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Abstract:

We examined changes in environmental parameters following an experimental benthic disturbance using a modified plough (estimated 15 cm penetration) on the Chatham Rise (~450 m depth), Aotearoa/New Zealand. Sediment core retrievals were undertaken using an Oceans Instruments MC-800 multicorer fitted with six 70 cm long polycarbonate core tubes with 9.52 cm internal diameter that took place pre-disturbance on 16-17 June 2019 (voyage TAN1903), post-disturbance on 24-25 June 2019 (TAN1903) and one-year post-disturbance on 14-19 June 2020 (TAN2005). In order to determine any background changes in the larger surrounding area between years (2019, 2020), an additional reference site with similar hydrographic and sediment attributes (REF, depth = 455 m), located approximately 15 km to the north-west of the Butterknife (Figure 1B), was also sampled in the pre-disturbance period (n = 2, TAN1903) and one-year post-disturbance (n = 3, TAN2005). Multicores were sliced into 0-1 cm and 1-5 cm layer fractions and analysed for bacterial cell abundance, water content, grain size distribution, particulate organic carbon, particulate nitrogen, total organic matter, and chlorophyll a and phaeopigment content.

Keyword(s):

deep sea mining; Macrofauna; sediment; sediment community oxygen consumption

Related to:

Hale, Rachel; Leduc, Daniel; Murray, Campbell; Rowden, Ashley A; Nodder, Scott D; Eager, Chris; Stewart, Rob; Hickey, Chris W; Pilditch, Conrad A; Clark, Malcolm R (2025): Effects of an experimental in situ seabed disturbance on deep-sea benthic ecosystem function and macro-infaunal community structure on the Chatham Rise, Southwest Pacific. New Zealand Journal of Marine and Freshwater Research, https://doi.org/10.1080/00288330.2025.2461333

Funding:

Ministry of Business, Innovation and Employment (MBIE), grant/award no. CO1X1614: Resilience of benthic communities to the effects of sedimentation (ROBES), https://niwa.co.nz/oceans/sedimentation-effects , Award: New Zealand Ministry of Business, Innovation and Employment Award

Coverage:

Median Latitude: -43.210314 * Median Longitude: 179.436159 * South-bound Latitude: -43.218000 * West-bound Longitude: 179.365400 * North-bound Latitude: -43.165400 * East-bound Longitude: 179.449810

Date/Time Start: 2019-06-13T23:45:00 * Date/Time End: 2020-06-18T17:50:00

Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.030 m

Event(s):

TAN1903_35 * Latitude: -43.165400 * Longitude: 179.365400 * Date/Time: 2019-06-13T23:45:00 * Elevation: -453.0 m * Campaign: (ROBES) * Basis:

TAN1903_36 * Latitude: -43.165500 * Longitude: 179.365400 * Date/Time: 2019-06-14T00:33:00 * Elevation: -462.0 m * Campaign: (ROBES) * Basis:

TAN1903_56 * Latitude: -43.215100 * Longitude: 179.448600 * Date/Time: 2019-06-16T06:57:00 * Elevation: -463.0 m * Campaign: (ROBES) * Basis:

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Hale, Rachel
2	Identification	ID		Hale, Rachel
3	Site	Site		Hale, Rachel
4	Time point, descriptive	Time point		Hale, Rachel
5	Number	No		Hale, Rachel		DistLoc
6	Type	Type		Hale, Rachel
7	Station label	Station		Hale, Rachel
8	Site	Site		Hale, Rachel
9	Device type	Device		Hale, Rachel
10	Location	Location		Hale, Rachel
11	Date/Time local	Date/Time local		Hale, Rachel
12	DATE/TIME	Date/Time		Hale, Rachel		Geocode – UTC
13	LATITUDE	Latitude		Hale, Rachel		Geocode – of sampling
14	LONGITUDE	Longitude		Hale, Rachel		Geocode – of sampling
15	Depth, bathymetric	Bathy depth	m	Hale, Rachel
16	DEPTH, sediment/rock	Depth sed	m	Hale, Rachel		Geocode – mean depth
17	Depth, top/min	Depth top	m	Hale, Rachel
18	Depth, bottom/max	Depth bot	m	Hale, Rachel
19	Chlorophyll a	Chl a	µg/g	Hale, Rachel	Spectrophotometer (SPEC)
20	Phaeopigments	Phae	µg/g	Hale, Rachel	Spectrophotometer (SPEC)
21	Nitrogen, particulate	PN	%	Hale, Rachel	Elemental analyzer
22	Carbon, organic, particulate	POC	%	Hale, Rachel	Elemental analyzer
23	Carbon/Nitrogen ratio	C/N		Hale, Rachel
24	Water content, sediment	Water sed	%	Hale, Rachel	Oven drying at 60°C
25	Organic matter	OM	%	Hale, Rachel	Ignition loss at 400°C	total
26	Particle size, mean	Part size mean	µm	Hale, Rachel
27	Sorting	Sort	µm	Hale, Rachel
28	Skewness	Skew		Hale, Rachel
29	Kurtosis	Kurt		Hale, Rachel
30	Sand	Sand	%	Hale, Rachel	Wet sieving
31	Mud	Mud	%	Hale, Rachel
32	Size fraction 64-32 mm, very coarse gravel, pebble	64-32 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
33	Size fraction 32-16 mm, coarse gravel, pebble	32-16 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
34	Size fraction 16-8 mm, medium gravel	16-8 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
35	Size fraction 8.0-4.0 mm, fine gravel	8-4 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
36	Size fraction 4.0-2.0 mm, very fine gravel, granule	4-2 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
37	Size fraction 2.000-1.000 mm, (-1.0)-0.0 phi, very coarse sand	2-1 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
38	Size fraction 1.000-0.500 mm, 0.0-1.0 phi, coarse sand	1-0.5 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
39	Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand	500-250 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
40	Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand	250-125 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
41	Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand	125-63 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
42	Size fraction 0.063-0.031 mm, very coarse silt	63-31 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
43	Size fraction 0.031-0.016 mm, coarse silt	31-16 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
44	Size fraction 0.016-0.008 mm, 6.0-7.0 phi, medium silt	16-8 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
45	Size fraction 0.008-0.004 mm, 7.0-8.0 phi, fine silt	8-4 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
46	Size fraction 4.0-2.0 mm, very fine gravel, granule	4-2 mm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320
47	Size fraction < 0.002 mm, clay	<2 µm	%	Hale, Rachel	Laser diffraction particle size analyser, Beckman Coulter, LS12 320

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

4006 data points

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