What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp.
17 pages International audience 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 region...
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Online Access: | https://hal.science/hal-03774825 https://doi.org/10.1007/s00227-022-04105-z |
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ftunivnantes:oai:HAL:hal-03774825v1 2023-05-15T17:02:07+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 N. Freshwater and Oceanic Sciences Unit of reSearch (FOCUS) Laboratory of Oceanology Université de Liège-Université de Liège Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Environnement Profond (LEP) Etudes des Ecosystèmes Profonds (EEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Research funded by the Belgian Science Policy Office (BELSPO) as part of the vERSO and RECTO projects (www. recto verso proje cts. be; contract nr. BR/132/A1/vERSO and BR/154/A1/RECTO), and by a PhD scholarship from the Belgian Fund for Research Training in Industry and Agriculture (FRIA). 2022-09 https://hal.science/hal-03774825 https://doi.org/10.1007/s00227-022-04105-z en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-022-04105-z hal-03774825 https://hal.science/hal-03774825 doi:10.1007/s00227-022-04105-z ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-03774825 Marine Biology, 2022, 169 (9), pp.118. ⟨10.1007/s00227-022-04105-z⟩ https://link.springer.com/article/10.1007/s00227-022-04105-z Benthic communities Food web Kelp forests Mixing models Stable isotopes [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2022 ftunivnantes https://doi.org/10.1007/s00227-022-04105-z 2023-02-01T00:11:36Z 17 pages International audience 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 Université de Nantes: HAL-UNIV-NANTES Kerguelen Kerguelen Islands Marine Biology 169 9 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Benthic communities Food web Kelp forests Mixing models Stable isotopes [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
Benthic communities Food web Kelp forests Mixing models Stable isotopes [SDE.BE]Environmental Sciences/Biodiversity and Ecology Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc N. 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 [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
17 pages International audience 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. |
author2 |
Freshwater and Oceanic Sciences Unit of reSearch (FOCUS) Laboratory of Oceanology Université de Liège-Université de Liège Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Environnement Profond (LEP) Etudes des Ecosystèmes Profonds (EEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Research funded by the Belgian Science Policy Office (BELSPO) as part of the vERSO and RECTO projects (www. recto verso proje cts. be; contract nr. BR/132/A1/vERSO and BR/154/A1/RECTO), and by a PhD scholarship from the Belgian Fund for Research Training in Industry and Agriculture (FRIA). |
format |
Article in Journal/Newspaper |
author |
Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc N. |
author_facet |
Le Bourg, Baptiste Saucède, Thomas Charpentier, Anouk Lepoint, Gilles Michel, Loïc N. |
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 |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03774825 https://doi.org/10.1007/s00227-022-04105-z |
geographic |
Kerguelen Kerguelen Islands |
geographic_facet |
Kerguelen Kerguelen Islands |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-03774825 Marine Biology, 2022, 169 (9), pp.118. ⟨10.1007/s00227-022-04105-z⟩ https://link.springer.com/article/10.1007/s00227-022-04105-z |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-022-04105-z hal-03774825 https://hal.science/hal-03774825 doi:10.1007/s00227-022-04105-z |
op_doi |
https://doi.org/10.1007/s00227-022-04105-z |
container_title |
Marine Biology |
container_volume |
169 |
container_issue |
9 |
_version_ |
1766055367344652288 |