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Benthic biomass size spectra in shelf and deep-sea sediments

Benthic biomass size spectra in shelf and deep-sea sediments
Benthic biomass size spectra in shelf and deep-sea sediments
The biomass distributions of marine benthic metazoans (meio- to macro-fauna, 1 ?g–32 mg wet weight) across three contrasting sites were investigated to test the hypothesis that allometry can consistently explain observed trends in biomass spectra. Biomass (and abundance) size spectra were determined from observations made at the Faroe–Shetland Channel (FSC) in the Northeast Atlantic (water depth 1600 m), the Fladen Ground (FG) in the North Sea (150 m), and the hypoxic Oman Margin (OM) in the Arabian Sea (500 m). Observed biomass increased with body size as a power law at FG (scaling exponent, b = 0.16) and FSC (b = 0.32), but less convincingly at OM (b = 0.12 but not significantly different from 0). A simple model was constructed to represent the same 16 metazoan size classes used for the observed spectra, all reliant on a common detrital food pool, and allowing the three key processes of ingestion, respiration and mortality to scale with body size. A micro-genetic algorithm was used to fit the model to observations at the sites. The model accurately reproduces the observed scaling without needing to include the effects of local influences such as hypoxia. Our results suggest that the size-scaling of mortality and ingestion are dominant factors determining the distribution of biomass across the meio- to macrofaunal size range in contrasting marine sediment communities. Both the observations and the model results are broadly in agreement with the "metabolic theory of ecology" in predicting a quarter power scaling of biomass across geometric body size classes.
1726-4170
6401-6416
Kelly-Gerreyn, B.A.
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Martin, A.P.
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Bett, B.J.
61342990-13be-45ae-9f5c-9540114335d9
Anderson, T.R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Kaariainen, J.I.
5357691b-1151-47e3-889e-35200d991afd
Main, C.E.
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Marcinko, C.J.
b245e735-368f-4b4d-9b3f-48f9f6baaf85
Yool, A.
882aeb0d-dda0-405e-844c-65b68cce5017
Kelly-Gerreyn, B.A.
1434d5fd-49f7-4774-b5ff-ddf334a3dcc2
Martin, A.P.
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Bett, B.J.
61342990-13be-45ae-9f5c-9540114335d9
Anderson, T.R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Kaariainen, J.I.
5357691b-1151-47e3-889e-35200d991afd
Main, C.E.
0a5d6d23-b877-4767-8881-70b11847a14b
Marcinko, C.J.
b245e735-368f-4b4d-9b3f-48f9f6baaf85
Yool, A.
882aeb0d-dda0-405e-844c-65b68cce5017

Kelly-Gerreyn, B.A., Martin, A.P., Bett, B.J., Anderson, T.R., Kaariainen, J.I., Main, C.E., Marcinko, C.J. and Yool, A. (2014) Benthic biomass size spectra in shelf and deep-sea sediments. Biogeosciences, 11 (22), 6401-6416. (doi:10.5194/bg-11-6401-2014).

Record type: Article

Abstract

The biomass distributions of marine benthic metazoans (meio- to macro-fauna, 1 ?g–32 mg wet weight) across three contrasting sites were investigated to test the hypothesis that allometry can consistently explain observed trends in biomass spectra. Biomass (and abundance) size spectra were determined from observations made at the Faroe–Shetland Channel (FSC) in the Northeast Atlantic (water depth 1600 m), the Fladen Ground (FG) in the North Sea (150 m), and the hypoxic Oman Margin (OM) in the Arabian Sea (500 m). Observed biomass increased with body size as a power law at FG (scaling exponent, b = 0.16) and FSC (b = 0.32), but less convincingly at OM (b = 0.12 but not significantly different from 0). A simple model was constructed to represent the same 16 metazoan size classes used for the observed spectra, all reliant on a common detrital food pool, and allowing the three key processes of ingestion, respiration and mortality to scale with body size. A micro-genetic algorithm was used to fit the model to observations at the sites. The model accurately reproduces the observed scaling without needing to include the effects of local influences such as hypoxia. Our results suggest that the size-scaling of mortality and ingestion are dominant factors determining the distribution of biomass across the meio- to macrofaunal size range in contrasting marine sediment communities. Both the observations and the model results are broadly in agreement with the "metabolic theory of ecology" in predicting a quarter power scaling of biomass across geometric body size classes.

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Published date: 26 November 2014
Organisations: Ocean and Earth Science, Marine Biogeochemistry

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Local EPrints ID: 373264
URI: http://eprints.soton.ac.uk/id/eprint/373264
ISSN: 1726-4170
PURE UUID: f8b87ba2-bd22-402e-80c7-a03eeb06e988

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Date deposited: 12 Jan 2015 15:08
Last modified: 02 Dec 2019 20:39

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