Particle Size Analysis and organic carbon content data from marine sediment samples within the Trevose Box, off southwest England, April 2023 (DEFRA funded FISP project)
Particle Size Analysis (PSA) and organic carbon content data from marine sediment sampling of two plots within the Trevose Box off south-west England between 14 - 18 April 2023 before and after fishing. This DEFRA funded FISP (Fisheries Industry Science Partnerships scheme) project aimed to understand the acute effects of scallop dredging and beam trawling on seabed carbon. The project was led by Bangor University in collaboration with Imperial College London, CEFAS, Western Fish Producers Organisation and the South Western Fish Producer Organisation. The study was conducted in two areas offshore south-west England, UK. The areas were within the Trevose box, which is a management area closed to bottom fishing for the months of January, February and March each year. This allowed us to sample areas which had not been exposed to fishing immediately before our sampling which would reduce the chance of seeing any effect from our experimental fishing. One plot was designated an area that would be experimentally fished by a beam trawler, and another by a scallop dredger (Figure 1). The plots were chosen to minimise differences in depth, seabed habitat, sediment type, wave energy and tidal currents within and between them. Both were chosen where their respective types of fishing gear had been used previously, although scallop dredging has been less common in this area in recent years. The sampling from the RV Prince Madog and experimental fishing from the fishing vessels took place between 14 – 18th April 2023. Before any fishing activity took place, grab sampling was conducted in the dredge plot and in the beam trawl plot that would be later fished to varying amounts, which will be referred to as ‘Times fished’ or ‘fishing intensity’. A 0.1 m2 Day grab was used. When the day grab was onboard two cores were used to subsample the grab sample as deep as possible, these were then sliced in 1 cm intervals and frozen onboard for later carbon analysis. A homogenised sample from the day grab was also taken for Particle Size Analysis. After the ‘Before’ grab samples were taken, a beam trawler and scallop dredger towed their gear along the sampled lanes in each respective plot. The 'After’ samples were taken after that fishing activity. Please see report for full details on how the PSA and organic content values were determined. Whitton, T.A., Austin, M., Newbould, A., Kennedy, H., Allender, S., Cavan, E., Parker, R., North, C., Hatchman, J., Hiddink, J.G. (2024) The impact of mobile demersal fishing on blue carbon in seabed sediments. Report to DEFRA. https://research.bangor.ac.uk/portal/en/researchoutputs/the-impact-of-mobile-demersal-fishing-on-blue-carbon-in-seabed-sediments(1fa1845a-6669-4b5b-83e1-234a6eafc75c).html
dataset
https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186571
name: Data
function: download
https://doi.org/10.5285/6d342aad-6b68-4345-beee-3cee4cb516c9
name: Digital Object Identifier (DOI)
function: information
http://data.bgs.ac.uk/id/dataHolding/13608317
eng
geoscientificInformation
publication
2008-06-01
Grab samples
TOC
Particle size distribution
NGDC Deposited Data
Citable Data
Marine surveys
MEDIN
Marine sediments
revision
2022
NERC_DDC
-5.7800
-5.6100
50.5800
50.5300
revision
2010
BRISTOL CHANNEL [id=2001350]
revision
2010
CELTIC SEA [id=2001353]
2023-04-14
2023-04-18
creation
2024-11-20
notApplicable
Each 1 cm sediment slice for carbon analysis dried at 60 °C and fractioned with a 2 mm sieve. Any fresh calcium carbonate from fauna that was retained on the 2 mm was added to the < 2 mm fraction, then the whole <2 mm fraction weighed then homogenised. Samples were acidified in 1N HCl to remove inorganic carbon. Pure CaCO3 powder were also acidified to make sure full inorganic carbon digestion occurred. Acidified samples were then rinsed and dried for CHN analysis to determine the organic carbon and nitrogen content as a % of the >2mm fraction for each slice down to 5 cm (5 slices of 0-1,1-2,3,4 and 5-6 cm intervals from the sediment surface). Sediment PSA broadly followed the procedures in Mason (2022) where the fraction > 1mm was analysed using dry sieving and those <1 mm using laser diffraction. This data in half phi size classes was then merged and analysed in GRADISTAT.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
.xlsx
The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
Bangor University
originator
Bangor University
originator
Bangor University
originator
Bangor University
originator
British Geological Survey
custodian
British Geological Survey
distributor
British Geological Survey
pointOfContact
British Geological Survey
The Lyell Centre, Research Avenue South
EDINBURGH
EH14 4AP
United Kingdom
+44 131 667 1000
pointOfContact
2025-03-10