Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation
The brown alga Fucus serratus forms dense stands on the sheltered low intertidal rocky shores of the Northeast Atlantic coast. In the southern English Channel, these stands have proved to be highly productive, particularly during emersion periods. Here, we studied the dampening effect of the canopy...
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fttriple:oai:gotriple.eu:10670/1.ilpq4e 2023-05-15T17:41:41+02:00 Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation Migné, Aline Duong, Gwendoline Menu, Dominique Davoult, Dominique Gévaert, François Adaptation et diversité en milieu marin (AD2M) Station biologique de Roscoff Roscoff (SBR) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2020-12-17 https://hal.sorbonne-universite.fr/hal-03079617/file/Photosynthesis%20Fucus%20serratus%20v1.pdf https://hal.sorbonne-universite.fr/hal-03079617 en eng HAL CCSD hal-03079617 10670/1.ilpq4e https://hal.sorbonne-universite.fr/hal-03079617/file/Photosynthesis%20Fucus%20serratus%20v1.pdf https://hal.sorbonne-universite.fr/hal-03079617 other Hyper Article en Ligne - Sciences de l'Homme et de la Société 2020 envir socio Preprint https://vocabularies.coar-repositories.org/resource_types/c_816b/ 2020 fttriple 2023-01-22T16:55:58Z The brown alga Fucus serratus forms dense stands on the sheltered low intertidal rocky shores of the Northeast Atlantic coast. In the southern English Channel, these stands have proved to be highly productive, particularly during emersion periods. Here, we studied the dampening effect of the canopy cover, associated with physiological and biochemical acclimation processes, that allows this species to withstand emersion stress. The F. serratus community primary production and the photosynthetic performance of thalli were concurrently followed in situ, throughout the midday emersion period, in different seasons and under various weather conditions. In addition, thallus samples were taken at various tidal stages to determine their content in biochemical compounds involved in photoprotective and antioxidant mechanisms. Under high light and temperature, the F. serratus community exhibited high aerial production rates (sometimes exceeding 1 g C m-2 h-1) that never decreased to less than 59% of the initial value during the emersion period. Under mild weather conditions, photosynthesis in thalli at the top of the canopy (measured as the relative electron transport rate) varied in response to changing incident light. Under harsh weather conditions (i.e. high light and temperature), the effective quantum yield of photosystem II (ΦPSII) dramatically decreased in thalli at the top of the canopy, but remained high in thalli at the bottom of or within the canopy. Due to self-shading, photosynthesis was light-limited in thalli in the lowest layer of the canopy, but was effective in thalli in the intermediate layers. Photoinhibition was observed in thalli at the top of the canopy (as a dramatic decrease in the optimal photosynthetic quantum yield Fv/Fm), but not in thalli beneath the canopy. At the end of the emersion period, Fv/Fm was strongly correlated to the relative water content of thalli. The findings from our simultaneous analysis of biochemical and photosynthetic parameters suggest coordination between the xanthophyll ... Report Northeast Atlantic Unknown |
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English |
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envir socio Migné, Aline Duong, Gwendoline Menu, Dominique Davoult, Dominique Gévaert, François Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
topic_facet |
envir socio |
description |
The brown alga Fucus serratus forms dense stands on the sheltered low intertidal rocky shores of the Northeast Atlantic coast. In the southern English Channel, these stands have proved to be highly productive, particularly during emersion periods. Here, we studied the dampening effect of the canopy cover, associated with physiological and biochemical acclimation processes, that allows this species to withstand emersion stress. The F. serratus community primary production and the photosynthetic performance of thalli were concurrently followed in situ, throughout the midday emersion period, in different seasons and under various weather conditions. In addition, thallus samples were taken at various tidal stages to determine their content in biochemical compounds involved in photoprotective and antioxidant mechanisms. Under high light and temperature, the F. serratus community exhibited high aerial production rates (sometimes exceeding 1 g C m-2 h-1) that never decreased to less than 59% of the initial value during the emersion period. Under mild weather conditions, photosynthesis in thalli at the top of the canopy (measured as the relative electron transport rate) varied in response to changing incident light. Under harsh weather conditions (i.e. high light and temperature), the effective quantum yield of photosystem II (ΦPSII) dramatically decreased in thalli at the top of the canopy, but remained high in thalli at the bottom of or within the canopy. Due to self-shading, photosynthesis was light-limited in thalli in the lowest layer of the canopy, but was effective in thalli in the intermediate layers. Photoinhibition was observed in thalli at the top of the canopy (as a dramatic decrease in the optimal photosynthetic quantum yield Fv/Fm), but not in thalli beneath the canopy. At the end of the emersion period, Fv/Fm was strongly correlated to the relative water content of thalli. The findings from our simultaneous analysis of biochemical and photosynthetic parameters suggest coordination between the xanthophyll ... |
author2 |
Adaptation et diversité en milieu marin (AD2M) Station biologique de Roscoff Roscoff (SBR) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Report |
author |
Migné, Aline Duong, Gwendoline Menu, Dominique Davoult, Dominique Gévaert, François |
author_facet |
Migné, Aline Duong, Gwendoline Menu, Dominique Davoult, Dominique Gévaert, François |
author_sort |
Migné, Aline |
title |
Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
title_short |
Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
title_full |
Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
title_fullStr |
Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
title_full_unstemmed |
Dynamics of Fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
title_sort |
dynamics of fucus serratus thallus photosynthesis and community primary production during emersion across seasons: canopy dampening and biochemical acclimation |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.sorbonne-universite.fr/hal-03079617/file/Photosynthesis%20Fucus%20serratus%20v1.pdf https://hal.sorbonne-universite.fr/hal-03079617 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société 2020 |
op_relation |
hal-03079617 10670/1.ilpq4e https://hal.sorbonne-universite.fr/hal-03079617/file/Photosynthesis%20Fucus%20serratus%20v1.pdf https://hal.sorbonne-universite.fr/hal-03079617 |
op_rights |
other |
_version_ |
1766143369369616384 |