Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area
Extensive beds of large subtidal kelps are characteristic of many temperate and subpolar coastlines. They provide habitats for a wide range of other species and are sites of high primary production that generate large quantities of water-borne particles and dissolved organic compounds that support d...
Published in: | Estuarine, Coastal and Shelf Science |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Academic Press Ltd- Elsevier Science Ltd
2012
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00088/19939/17760.pdf https://doi.org/10.1016/j.ecss.2012.04.031 https://archimer.ifremer.fr/doc/00088/19939/ |
id |
ftarchimer:oai:archimer.ifremer.fr:19939 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:19939 2023-05-15T13:47:21+02:00 Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area Schapira, Mathilde Mcquaid, Christopher D. Froneman, Pierre W. 2012-06 application/pdf https://archimer.ifremer.fr/doc/00088/19939/17760.pdf https://doi.org/10.1016/j.ecss.2012.04.031 https://archimer.ifremer.fr/doc/00088/19939/ eng eng Academic Press Ltd- Elsevier Science Ltd https://archimer.ifremer.fr/doc/00088/19939/17760.pdf doi:10.1016/j.ecss.2012.04.031 https://archimer.ifremer.fr/doc/00088/19939/ 2012 Elsevier Ltd. All rights reserved. info:eu-repo/semantics/openAccess restricted use Estuarine Coastal And Shelf Science (0272-7714) (Academic Press Ltd- Elsevier Science Ltd), 2012-06 , Vol. 106 , P. 69-79 prokaryotes free-living particle-associated growth efficiency kelp sub-Antarctic island text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.1016/j.ecss.2012.04.031 2021-09-23T20:21:00Z Extensive beds of large subtidal kelps are characteristic of many temperate and subpolar coastlines. They provide habitats for a wide range of other species and are sites of high primary production that generate large quantities of water-borne particles and dissolved organic compounds that support distinctive communities of prokaryotes. We measured prokaryotic metabolism along transects from the shore to the outside of three giant kelp forests (Macrocystis pyrifera) located in the shelf waters of the Prince Edward Islands (Southern Ocean). Abundance, heterotrophic production (PHP), respiration rates (R-ETS) and growth efficiencies (PGE) were investigated within the particle-associated (PA) and the free-living (FL) communities. Temperature, salinity and inorganic nutrient concentrations indicated distinct hydrological differences among the kelp forests that were related to different levels of freshwater input through island run-off. In contrast, detritus and particulate organic matter concentrations showed a common pattern, decreasing from the near-shore to offshore at all sampling sites, suggesting the retention of organically enriched water masses inshore of the kelp forests. While FL and PA abundances did not differ significantly along transects, FL and PA-PHP and PGE all varied significantly across the kelp forests, following the same pattern across each forest. PA-PGE was significantly higher than FL-PGE in the near-shore waters and farther offshore, while FL-PGE was higher or equal to PA-PGE inside the kelp. This shift can be interpreted in terms of gradients in both the age and origins of organic material across the kelp forests. Higher PA-PGE implies that a larger fraction of organic carbon on colonized particles is converted into prokaryotic biomass and so becomes available to higher trophic levels inshore and offshore of M. pyrifera forests than inside the kelp bed. In contrast, low PA-PGE suggests that a large quantity of carbon passes through the PA-community and is mainly respired within the kelp forest. These results suggest the retention of particles within giant kelp forests. In controlling the metabolic activity of PA and FL prokaryotes, this retention will influence overall carbon flux around the archipelago. In particular, the observation of a common pattern across different M. pyrifera forests has important implications for the role of this species as an autogenic ecological engineer in coastal environments. (C) 2012 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Prince Edward Islands Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean Estuarine, Coastal and Shelf Science 106 69 79 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
prokaryotes free-living particle-associated growth efficiency kelp sub-Antarctic island |
spellingShingle |
prokaryotes free-living particle-associated growth efficiency kelp sub-Antarctic island Schapira, Mathilde Mcquaid, Christopher D. Froneman, Pierre W. Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area |
topic_facet |
prokaryotes free-living particle-associated growth efficiency kelp sub-Antarctic island |
description |
Extensive beds of large subtidal kelps are characteristic of many temperate and subpolar coastlines. They provide habitats for a wide range of other species and are sites of high primary production that generate large quantities of water-borne particles and dissolved organic compounds that support distinctive communities of prokaryotes. We measured prokaryotic metabolism along transects from the shore to the outside of three giant kelp forests (Macrocystis pyrifera) located in the shelf waters of the Prince Edward Islands (Southern Ocean). Abundance, heterotrophic production (PHP), respiration rates (R-ETS) and growth efficiencies (PGE) were investigated within the particle-associated (PA) and the free-living (FL) communities. Temperature, salinity and inorganic nutrient concentrations indicated distinct hydrological differences among the kelp forests that were related to different levels of freshwater input through island run-off. In contrast, detritus and particulate organic matter concentrations showed a common pattern, decreasing from the near-shore to offshore at all sampling sites, suggesting the retention of organically enriched water masses inshore of the kelp forests. While FL and PA abundances did not differ significantly along transects, FL and PA-PHP and PGE all varied significantly across the kelp forests, following the same pattern across each forest. PA-PGE was significantly higher than FL-PGE in the near-shore waters and farther offshore, while FL-PGE was higher or equal to PA-PGE inside the kelp. This shift can be interpreted in terms of gradients in both the age and origins of organic material across the kelp forests. Higher PA-PGE implies that a larger fraction of organic carbon on colonized particles is converted into prokaryotic biomass and so becomes available to higher trophic levels inshore and offshore of M. pyrifera forests than inside the kelp bed. In contrast, low PA-PGE suggests that a large quantity of carbon passes through the PA-community and is mainly respired within the kelp forest. These results suggest the retention of particles within giant kelp forests. In controlling the metabolic activity of PA and FL prokaryotes, this retention will influence overall carbon flux around the archipelago. In particular, the observation of a common pattern across different M. pyrifera forests has important implications for the role of this species as an autogenic ecological engineer in coastal environments. (C) 2012 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Schapira, Mathilde Mcquaid, Christopher D. Froneman, Pierre W. |
author_facet |
Schapira, Mathilde Mcquaid, Christopher D. Froneman, Pierre W. |
author_sort |
Schapira, Mathilde |
title |
Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area |
title_short |
Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area |
title_full |
Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area |
title_fullStr |
Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area |
title_full_unstemmed |
Free-living and particle-associated prokaryote metabolism in giant kelp forests: Implications for carbon flux in a sub-Antarctic coastal area |
title_sort |
free-living and particle-associated prokaryote metabolism in giant kelp forests: implications for carbon flux in a sub-antarctic coastal area |
publisher |
Academic Press Ltd- Elsevier Science Ltd |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00088/19939/17760.pdf https://doi.org/10.1016/j.ecss.2012.04.031 https://archimer.ifremer.fr/doc/00088/19939/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Prince Edward Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Prince Edward Islands Southern Ocean |
op_source |
Estuarine Coastal And Shelf Science (0272-7714) (Academic Press Ltd- Elsevier Science Ltd), 2012-06 , Vol. 106 , P. 69-79 |
op_relation |
https://archimer.ifremer.fr/doc/00088/19939/17760.pdf doi:10.1016/j.ecss.2012.04.031 https://archimer.ifremer.fr/doc/00088/19939/ |
op_rights |
2012 Elsevier Ltd. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.ecss.2012.04.031 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
106 |
container_start_page |
69 |
op_container_end_page |
79 |
_version_ |
1766246961702240256 |