What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp
Kelp forests dominated by Macrocystis pyrifera are widely distributed in coastal waters from boreal, temperate and subantarctic regions. This widespread distribution may result in regional differences in food web structure and functioning. In temperate northern regions, where most studies on kelp fo...
Published in: | Marine Biology |
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Language: | English |
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Springer Science and Business Media LLC
2022
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Online Access: | https://archimer.ifremer.fr/doc/00791/90328/95849.pdf https://archimer.ifremer.fr/doc/00791/90328/95850.pdf https://doi.org/10.1007/s00227-022-04105-z https://archimer.ifremer.fr/doc/00791/90328/ |
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ftarchimer:oai:archimer.ifremer.fr:90328 2023-07-30T04:04:37+02:00 What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc 2022-09 application/pdf https://archimer.ifremer.fr/doc/00791/90328/95849.pdf https://archimer.ifremer.fr/doc/00791/90328/95850.pdf https://doi.org/10.1007/s00227-022-04105-z https://archimer.ifremer.fr/doc/00791/90328/ eng eng Springer Science and Business Media LLC https://archimer.ifremer.fr/doc/00791/90328/95849.pdf https://archimer.ifremer.fr/doc/00791/90328/95850.pdf doi:10.1007/s00227-022-04105-z https://archimer.ifremer.fr/doc/00791/90328/ info:eu-repo/semantics/openAccess restricted use Marine Biology (0025-3162) (Springer Science and Business Media LLC), 2022-09 , Vol. 169 , N. 9 , P. 118 (16p.) Benthic communities Food web Kelp forests Mixing models Stable isotopes text Article info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.1007/s00227-022-04105-z 2023-07-18T22:51:15Z Kelp forests dominated by Macrocystis pyrifera are widely distributed in coastal waters from boreal, temperate and subantarctic regions. This widespread distribution may result in regional differences in food web structure and functioning. In temperate northern regions, where most studies on kelp forest benthic food webs have been conducted, kelp grazing is a well-documented phenomenon and can lead to the overgrazing of M. pyrifera by sea urchins when their predators (e.g., sea otters) are absent. In contrast, little is known about their counterparts in subantarctic areas. The present study aimed to reconstruct the benthic food web of a kelp forest dominated by M. pyrifera in a subantarctic environment using stable isotope analysis. Stable carbon (δ13C), nitrogen (δ15N) and sulfur (δ34S) isotope ratios were measured from food sources (macrophytobenthos, suspended particulate organic matter SPOM, and sediment) and consumers (sponges, bivalves, gastropods, sedentary and mobile polychaetes, arthropods and echinoderms) which were sampled in a kelp forest of the Kerguelen archipelago. Mixing models highlighted two interconnected trophic pathways which were either supported by SPOM and resuspended macrophytobenthos detritus (bentho-pelagic), or by live micro/macrophytobenthos (phytobenthos-based). No major prey were highlighted for several consumers, indicating the existence of potential supplementary trophic pathways. No consumer relying primarily on living M. pyrifera was highlighted by the mixing models. The investigated kelp forest is hence a complex ecosystem supporting multiple trophic pathways, and direct consumption of M. pyrifera is limited. Nonetheless, M. pyrifera and other macrophytobenthos species may constitute a pool of detritus supporting several trophic pathways. Article in Journal/Newspaper Kerguelen Islands Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Kerguelen Kerguelen Islands Marine Biology 169 9 |
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 |
Benthic communities Food web Kelp forests Mixing models Stable isotopes |
spellingShingle |
Benthic communities Food web Kelp forests Mixing models Stable isotopes Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
topic_facet |
Benthic communities Food web Kelp forests Mixing models Stable isotopes |
description |
Kelp forests dominated by Macrocystis pyrifera are widely distributed in coastal waters from boreal, temperate and subantarctic regions. This widespread distribution may result in regional differences in food web structure and functioning. In temperate northern regions, where most studies on kelp forest benthic food webs have been conducted, kelp grazing is a well-documented phenomenon and can lead to the overgrazing of M. pyrifera by sea urchins when their predators (e.g., sea otters) are absent. In contrast, little is known about their counterparts in subantarctic areas. The present study aimed to reconstruct the benthic food web of a kelp forest dominated by M. pyrifera in a subantarctic environment using stable isotope analysis. Stable carbon (δ13C), nitrogen (δ15N) and sulfur (δ34S) isotope ratios were measured from food sources (macrophytobenthos, suspended particulate organic matter SPOM, and sediment) and consumers (sponges, bivalves, gastropods, sedentary and mobile polychaetes, arthropods and echinoderms) which were sampled in a kelp forest of the Kerguelen archipelago. Mixing models highlighted two interconnected trophic pathways which were either supported by SPOM and resuspended macrophytobenthos detritus (bentho-pelagic), or by live micro/macrophytobenthos (phytobenthos-based). No major prey were highlighted for several consumers, indicating the existence of potential supplementary trophic pathways. No consumer relying primarily on living M. pyrifera was highlighted by the mixing models. The investigated kelp forest is hence a complex ecosystem supporting multiple trophic pathways, and direct consumption of M. pyrifera is limited. Nonetheless, M. pyrifera and other macrophytobenthos species may constitute a pool of detritus supporting several trophic pathways. |
format |
Article in Journal/Newspaper |
author |
Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc |
author_facet |
Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc |
author_sort |
Le Bourg, Baptiste |
title |
What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
title_short |
What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
title_full |
What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
title_fullStr |
What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
title_full_unstemmed |
What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp |
title_sort |
what is the menu today in a subantarctic kelp food web from the kerguelen islands? phytodetritus, phytoplankton and phytobenthos; not living kelp |
publisher |
Springer Science and Business Media LLC |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00791/90328/95849.pdf https://archimer.ifremer.fr/doc/00791/90328/95850.pdf https://doi.org/10.1007/s00227-022-04105-z https://archimer.ifremer.fr/doc/00791/90328/ |
geographic |
Kerguelen Kerguelen Islands |
geographic_facet |
Kerguelen Kerguelen Islands |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
Marine Biology (0025-3162) (Springer Science and Business Media LLC), 2022-09 , Vol. 169 , N. 9 , P. 118 (16p.) |
op_relation |
https://archimer.ifremer.fr/doc/00791/90328/95849.pdf https://archimer.ifremer.fr/doc/00791/90328/95850.pdf doi:10.1007/s00227-022-04105-z https://archimer.ifremer.fr/doc/00791/90328/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1007/s00227-022-04105-z |
container_title |
Marine Biology |
container_volume |
169 |
container_issue |
9 |
_version_ |
1772816178019827712 |