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Seabed attributes and meiofaunal abundance associated with a hydrodynamic gradient in Baynes Sound, British Columbia, Canada

Seabed attributes and meiofaunal abundance associated with a hydrodynamic gradient in Baynes Sound, British Columbia, Canada
Seabed attributes and meiofaunal abundance associated with a hydrodynamic gradient in Baynes Sound, British Columbia, Canada

Sutherland, T.F.; Garcia-Hoyos, L.M.; Poon, P.; Krassovski, M.V.; Foreman, M.G.G.; Martin, A.J., and Amos, C.L., 2018. Seabed attributes and meiofaunal abundance associated with a hydrodynamic gradient in Baynes Sound, British Columbia, Canada. The distribution of seabed geotechnical, biochemical, and meiofauna attributes was examined in Baynes Sound, British Columbia, between 2009 and 2014. Among attributes measured were sediment porosity, organic carbon and nitrogen, and trace element concentrations (e.g., zinc, copper), which increased with increasing sediment fines content toward the head of the Sound. A ternary plot (sand-silt-clay percentages) revealed a constant clay/silt ratio across a range of sand proportions with textures ranging from well-sorted sand at the high-energy SE entrance to silt-dominated mud in the depositional basin. These sediment textures were related to modeled maximum velocity values within 5 m of the seabed (Umax,5), with highest values (restricted entrance) and lowest values (deep basin) representing sand depositional and mud depositional facies. Sediment porewater sulfide fell into an oxic category (0-700 μM), exhibiting a lack of variation and organic enrichment within the Sound. The first principal component analysis (PCA) factor described the alignment between fine sediments, organics, Cu and Zn, and meiofauna attributes and accounted for 49% of the total variance. The second PCA factor (19% of total variance) described the relationship between Umax,5 and sediment grain size fractions >0.5 mm and an indirect association with water depth and fine sand (0.105-0.250 mm). Meiofauna were associated with a medium sand fraction (0.25 mm) characterized by low-porosity and low-organic sand loam textures. Although the range in abundance was relatively greater for nematodes, harpacticoid copepods revealed a stronger response to changes in sediment geotechnical and organic attributes, suggesting these taxa may be used to describe seabed variations or potential perturbations.

meiofauna, nutrients, porosity, Sediment, texture, velocity
0749-0208
1021-1034
Sutherland, Terri F.
012af7c5-4bec-4867-8c06-c8fff186fbec
Garcia-Hoyos, Lorena M.
c2b86e1d-eced-48bf-b4fc-29867eb5b2f3
Poon, Perry
198a5b04-3b48-46f7-b539-ff0c2c3f8f16
Krassovski, Maxim V.
41d23ba2-0ff7-478f-a607-71ef6795f603
Foreman, Michael G.G.
b64bb46f-401f-4d98-91b1-e550b5821f44
Martin, Alan J.
8e4d87d6-c27e-4da8-9ff3-b37679ec1c56
Amos, Carl L.
d0a18a13-bccd-4fdc-8901-aea595d4ed5c
Sutherland, Terri F.
012af7c5-4bec-4867-8c06-c8fff186fbec
Garcia-Hoyos, Lorena M.
c2b86e1d-eced-48bf-b4fc-29867eb5b2f3
Poon, Perry
198a5b04-3b48-46f7-b539-ff0c2c3f8f16
Krassovski, Maxim V.
41d23ba2-0ff7-478f-a607-71ef6795f603
Foreman, Michael G.G.
b64bb46f-401f-4d98-91b1-e550b5821f44
Martin, Alan J.
8e4d87d6-c27e-4da8-9ff3-b37679ec1c56
Amos, Carl L.
d0a18a13-bccd-4fdc-8901-aea595d4ed5c

Sutherland, Terri F., Garcia-Hoyos, Lorena M., Poon, Perry, Krassovski, Maxim V., Foreman, Michael G.G., Martin, Alan J. and Amos, Carl L. (2018) Seabed attributes and meiofaunal abundance associated with a hydrodynamic gradient in Baynes Sound, British Columbia, Canada. Journal of Coastal Research, 34 (5), 1021-1034. (doi:10.2112/JCOASTRES-D-17-00213.1).

Record type: Article

Abstract

Sutherland, T.F.; Garcia-Hoyos, L.M.; Poon, P.; Krassovski, M.V.; Foreman, M.G.G.; Martin, A.J., and Amos, C.L., 2018. Seabed attributes and meiofaunal abundance associated with a hydrodynamic gradient in Baynes Sound, British Columbia, Canada. The distribution of seabed geotechnical, biochemical, and meiofauna attributes was examined in Baynes Sound, British Columbia, between 2009 and 2014. Among attributes measured were sediment porosity, organic carbon and nitrogen, and trace element concentrations (e.g., zinc, copper), which increased with increasing sediment fines content toward the head of the Sound. A ternary plot (sand-silt-clay percentages) revealed a constant clay/silt ratio across a range of sand proportions with textures ranging from well-sorted sand at the high-energy SE entrance to silt-dominated mud in the depositional basin. These sediment textures were related to modeled maximum velocity values within 5 m of the seabed (Umax,5), with highest values (restricted entrance) and lowest values (deep basin) representing sand depositional and mud depositional facies. Sediment porewater sulfide fell into an oxic category (0-700 μM), exhibiting a lack of variation and organic enrichment within the Sound. The first principal component analysis (PCA) factor described the alignment between fine sediments, organics, Cu and Zn, and meiofauna attributes and accounted for 49% of the total variance. The second PCA factor (19% of total variance) described the relationship between Umax,5 and sediment grain size fractions >0.5 mm and an indirect association with water depth and fine sand (0.105-0.250 mm). Meiofauna were associated with a medium sand fraction (0.25 mm) characterized by low-porosity and low-organic sand loam textures. Although the range in abundance was relatively greater for nematodes, harpacticoid copepods revealed a stronger response to changes in sediment geotechnical and organic attributes, suggesting these taxa may be used to describe seabed variations or potential perturbations.

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More information

Accepted/In Press date: 6 February 2018
e-pub ahead of print date: 10 April 2018
Published date: 1 September 2018
Keywords: meiofauna, nutrients, porosity, Sediment, texture, velocity

Identifiers

Local EPrints ID: 423851
URI: http://eprints.soton.ac.uk/id/eprint/423851
ISSN: 0749-0208
PURE UUID: 09f0c41a-09d6-44a6-aa5c-43a496ba80c3

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Date deposited: 03 Oct 2018 16:30
Last modified: 07 Oct 2020 00:43

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Contributors

Author: Terri F. Sutherland
Author: Lorena M. Garcia-Hoyos
Author: Perry Poon
Author: Maxim V. Krassovski
Author: Michael G.G. Foreman
Author: Alan J. Martin
Author: Carl L. Amos

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