Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands
Carbon flows in the benthic food web of the Porcupine Abyssal Plain (4850 m, northeast Atlantic) were reconstructed using linear inverse modeling based on mass balances of the various compartments, biomass data, carbon flux measurements, physiological constraints, and data from a previously publishe...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2012.57.2.0645 2024-09-15T18:25:26+00:00 Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands van Oevelen, Dick Soetaert, Karline Heip, Carlo 2012 http://dx.doi.org/10.4319/lo.2012.57.2.0645 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2012.57.2.0645 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2012.57.2.0645 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 57, issue 2, page 645-664 ISSN 0024-3590 1939-5590 journal-article 2012 crwiley https://doi.org/10.4319/lo.2012.57.2.0645 2024-08-09T04:31:39Z Carbon flows in the benthic food web of the Porcupine Abyssal Plain (4850 m, northeast Atlantic) were reconstructed using linear inverse modeling based on mass balances of the various compartments, biomass data, carbon flux measurements, physiological constraints, and data from a previously published 13 C‐phytodetritus pulse‐chase experiment. Food web compartments consisted of bacteria, Foraminifera, three feeding types of nematodes and of macrofauna, and four feeding types of megafauna. Three lability classes of detritus were defined to clarify especially the possible role of labile detritus in this abyssal plain food web. Total detritus inputs to the food web were 0.56 mmol C m −2 d −1 , with only a minor (3.8%) contribution of labile detritus. The dominant pathway in the food web was dissolution of more refractory detritus, uptake by bacteria, and subsequent respiration (0.36 mmol C m −2 d −1 , 80% of the community respiration). Lower contributions to community respiration were found for surface‐deposit‐feeding macrobenthos (5.6%), Foraminifera (4.9%), predatory macrobenthos (3.8%), and other deposit‐feeding macrobenthos (3.1%). Contributions by other benthic compartments were < 1%. 13 C‐phytodetritus transfer data strongly constrained the carbon source for bacteria, Foraminifera, and the nematode and macrobenthic compartments. Surprisingly, labile detritus contributed < 5% of the total carbon requirements for all these compartments. Carbon sources were much less constrained for the megabenthic compartments because for these compartments no 13 C pulse‐chase data were available. The carbon flow model evidently shows a limited role of labile detritus in the food web. Article in Journal/Newspaper Northeast Atlantic Wiley Online Library Limnology and Oceanography 57 2 645 664 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Carbon flows in the benthic food web of the Porcupine Abyssal Plain (4850 m, northeast Atlantic) were reconstructed using linear inverse modeling based on mass balances of the various compartments, biomass data, carbon flux measurements, physiological constraints, and data from a previously published 13 C‐phytodetritus pulse‐chase experiment. Food web compartments consisted of bacteria, Foraminifera, three feeding types of nematodes and of macrofauna, and four feeding types of megafauna. Three lability classes of detritus were defined to clarify especially the possible role of labile detritus in this abyssal plain food web. Total detritus inputs to the food web were 0.56 mmol C m −2 d −1 , with only a minor (3.8%) contribution of labile detritus. The dominant pathway in the food web was dissolution of more refractory detritus, uptake by bacteria, and subsequent respiration (0.36 mmol C m −2 d −1 , 80% of the community respiration). Lower contributions to community respiration were found for surface‐deposit‐feeding macrobenthos (5.6%), Foraminifera (4.9%), predatory macrobenthos (3.8%), and other deposit‐feeding macrobenthos (3.1%). Contributions by other benthic compartments were < 1%. 13 C‐phytodetritus transfer data strongly constrained the carbon source for bacteria, Foraminifera, and the nematode and macrobenthic compartments. Surprisingly, labile detritus contributed < 5% of the total carbon requirements for all these compartments. Carbon sources were much less constrained for the megabenthic compartments because for these compartments no 13 C pulse‐chase data were available. The carbon flow model evidently shows a limited role of labile detritus in the food web. |
format |
Article in Journal/Newspaper |
author |
van Oevelen, Dick Soetaert, Karline Heip, Carlo |
spellingShingle |
van Oevelen, Dick Soetaert, Karline Heip, Carlo Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands |
author_facet |
van Oevelen, Dick Soetaert, Karline Heip, Carlo |
author_sort |
van Oevelen, Dick |
title |
Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands |
title_short |
Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands |
title_full |
Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands |
title_fullStr |
Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands |
title_full_unstemmed |
Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands |
title_sort |
carbon flows in the benthic food web of the porcupine abyssal plain: the (un)importance of labile detritus in supporting microbial and faunal carbon demands |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.4319/lo.2012.57.2.0645 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2012.57.2.0645 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2012.57.2.0645 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Limnology and Oceanography volume 57, issue 2, page 645-664 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2012.57.2.0645 |
container_title |
Limnology and Oceanography |
container_volume |
57 |
container_issue |
2 |
container_start_page |
645 |
op_container_end_page |
664 |
_version_ |
1810465949966401536 |