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Links between deep-sea respiration and community dynamics

Links between deep-sea respiration and community dynamics
Links between deep-sea respiration and community dynamics
It has been challenging to establish the mechanisms that link ecosystem functioning to environmental and resource variation, as well as community structure, composition and compensatory dynamics. A compelling hypothesis of compensatory dynamics, known as 'zero-sum' dynamics, is framed in terms of energy resource and demand units, where there is an inverse link between the number of individuals in a community and the mean individual metabolic rate. However, body-size energy distributions that are non-uniform suggest a niche advantage at a particular size class, which suggests a limit to which metabolism can explain community structuring. Since 1989, the composition and structure of abyssal seafloor communities in the northeast Pacific and northeast Atlantic have varied inter-annually with links to climate and resource variation. Here, for the first time, class and mass-specific individual respiration rates were examined along with resource supply and time series of density and biomass data of the dominant abyssal megafauna, echinoderms. Both sites had inverse relationships between density and mean individual metabolic rate. We found fourfold variation in echinoderm respiration over inter-annual timescales at both sites, which were linked to shifts in species composition and structure. In the north-eastern Pacific, the respiration of mobile surface deposit feeding echinoderms was positively linked to climate-driven particulate organic carbon fluxes with a temporal lag of about one year, respiring about 1-6% of the annual particulate organic carbon flux.
benthic, biogeochemistry, carbon, compensatory dynamics, deep sea, echinoderm, respiration, zero-sum dynamics
0012-9658
1651-1662
Ruhl, H.A.
177608ef-7793-4911-86cf-cd9960ff22b6
Bett, B.J.
61342990-13be-45ae-9f5c-9540114335d9
Hughes, S.J.M.
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Alt, Claudia H.S.
aa8e3324-b74b-4678-b0e0-1cc1b1b80517
Ross, E.J.
a8d29749-cb8a-4f6d-b62d-229b5de8ea99
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Pebody, C.A.
2aa9ccad-ac79-4ad2-b367-aba3dfc94a53
Smith, K.L.
a5d7bde4-722a-4989-92dc-86dd85d26786
Billett, D.S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Ruhl, H.A.
177608ef-7793-4911-86cf-cd9960ff22b6
Bett, B.J.
61342990-13be-45ae-9f5c-9540114335d9
Hughes, S.J.M.
2921e6e4-6e07-48aa-95f8-c5b16c814819
Alt, Claudia H.S.
aa8e3324-b74b-4678-b0e0-1cc1b1b80517
Ross, E.J.
a8d29749-cb8a-4f6d-b62d-229b5de8ea99
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Pebody, C.A.
2aa9ccad-ac79-4ad2-b367-aba3dfc94a53
Smith, K.L.
a5d7bde4-722a-4989-92dc-86dd85d26786
Billett, D.S.M.
aab439e2-c839-4cd2-815c-3d401e0468db

Ruhl, H.A., Bett, B.J., Hughes, S.J.M., Alt, Claudia H.S., Ross, E.J., Lampitt, R.S., Pebody, C.A., Smith, K.L. and Billett, D.S.M. (2014) Links between deep-sea respiration and community dynamics. Ecology, 95 (6), 1651-1662. (doi:10.1890/13-0675.1).

Record type: Article

Abstract

It has been challenging to establish the mechanisms that link ecosystem functioning to environmental and resource variation, as well as community structure, composition and compensatory dynamics. A compelling hypothesis of compensatory dynamics, known as 'zero-sum' dynamics, is framed in terms of energy resource and demand units, where there is an inverse link between the number of individuals in a community and the mean individual metabolic rate. However, body-size energy distributions that are non-uniform suggest a niche advantage at a particular size class, which suggests a limit to which metabolism can explain community structuring. Since 1989, the composition and structure of abyssal seafloor communities in the northeast Pacific and northeast Atlantic have varied inter-annually with links to climate and resource variation. Here, for the first time, class and mass-specific individual respiration rates were examined along with resource supply and time series of density and biomass data of the dominant abyssal megafauna, echinoderms. Both sites had inverse relationships between density and mean individual metabolic rate. We found fourfold variation in echinoderm respiration over inter-annual timescales at both sites, which were linked to shifts in species composition and structure. In the north-eastern Pacific, the respiration of mobile surface deposit feeding echinoderms was positively linked to climate-driven particulate organic carbon fluxes with a temporal lag of about one year, respiring about 1-6% of the annual particulate organic carbon flux.

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13-0675%2E1.pdf - Author's Original
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More information

Accepted/In Press date: December 2013
Published date: June 2014
Keywords: benthic, biogeochemistry, carbon, compensatory dynamics, deep sea, echinoderm, respiration, zero-sum dynamics
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 362313
URI: http://eprints.soton.ac.uk/id/eprint/362313
ISSN: 0012-9658
PURE UUID: c907607e-eeb4-4eb1-8e1c-1b49ed6eee21

Catalogue record

Date deposited: 26 Feb 2014 14:25
Last modified: 11 Nov 2019 20:52

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