The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest
International audience Large stands of free living (calcareous) coralline algae - called maerl beds - play a major role as ecosystem engineers in coastal areas throughout the world. They are also subject to strong anthropogenic pressures at global and local scales, which threaten their survival. How...
Published in: | Estuarine, Coastal and Shelf Science |
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Online Access: | https://insu.hal.science/insu-03684916 https://doi.org/10.1016/j.ecss.2018.04.032 |
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ftsorbonneuniv:oai:HAL:insu-03684916v1 2024-09-15T18:28:26+00:00 The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest Qui-Minet, Zujaila Nohemy Delaunay, Coralie Grall, Jacques Six, Christophe Cariou, Thierry Bohner, Olivier Legrand, Erwann Davoult, Dominique Martin, Sophie Station biologique de Roscoff = Roscoff Marine Station (SBR) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Adaptation et diversité en milieu marin (ADMM) Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff = Roscoff Marine Station (SBR) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Fédération de recherche de Roscoff (FR2424) 2018 https://insu.hal.science/insu-03684916 https://doi.org/10.1016/j.ecss.2018.04.032 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ecss.2018.04.032 insu-03684916 https://insu.hal.science/insu-03684916 BIBCODE: 2018ECSS.208.140Q doi:10.1016/j.ecss.2018.04.032 ISSN: 0272-7714 EISSN: 1096-0015 Estuarine, Coastal and Shelf Science https://insu.hal.science/insu-03684916 Estuarine, Coastal and Shelf Science, 2018, 208, pp.140-152. ⟨10.1016/j.ecss.2018.04.032⟩ Freshwater inputs Ocean acidification Ocean warming Coralline algae Maerl [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2018 ftsorbonneuniv https://doi.org/10.1016/j.ecss.2018.04.032 2024-07-25T23:47:50Z International audience Large stands of free living (calcareous) coralline algae - called maerl beds - play a major role as ecosystem engineers in coastal areas throughout the world. They are also subject to strong anthropogenic pressures at global and local scales, which threaten their survival. However, the macroalgal epiphytes growing on maerl may benefit from these pressures, developing to the detriment of maerl algae. Here, we sought to gain insight into how maerl beds and their epiphytic algae are disturbed by variations in the local environment, and how these variations affect their capacity to respond to global change. In 2015, we monitored three maerl beds located in the Bay of Brest (Brittany, France). Sites with contrasting conditions were selected, with one station lying in a zone close to the harbor (northern basin S1) and two stations (S2 and S3) located in areas away from the main urban effluents but subject to other sources of local change: higher currents at S3 (PREVIMER Ocean Forecast) and higher sedimentation rates at S2 (Ehrhold et al., 2016). We observed significant temporal variations of physico-chemical parameters, on an annual but also on a daily basis. Results showed that S2 differentiated itself from the other stations, this station experienced higher fluctuations of salinity, nutrient concentrations and carbonate system parameters and hosted the lowest (living) maerl biomass (4.38 ± 1.54 kg DW m -2 ). S3 observed the highest living maerl biomass (14.56 ± 1.61 kg DW m -2 ) and the lowest non-calcareous epiphytic macroalgal abundance (0.1-7.9 g DW m -2 ). S1 displayed the highest heterogeneity in terms of living maerl biomass (it varied from 0.8 to 8.6 kg DW m -2 ), and the highest Chl a content. However, we did not record differences in terms of physico-chemical parameters between S1 and S3. No positive relationship was observed between nutrient enrichment and macroalgal epiphyte abundance, but epiphyte abundance was higher at stations with lower maerl biomass (S1 and S2) (mean value ... Article in Journal/Newspaper Ocean acidification HAL Sorbonne Université Estuarine, Coastal and Shelf Science 208 140 152 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Freshwater inputs Ocean acidification Ocean warming Coralline algae Maerl [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences |
spellingShingle |
Freshwater inputs Ocean acidification Ocean warming Coralline algae Maerl [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences Qui-Minet, Zujaila Nohemy Delaunay, Coralie Grall, Jacques Six, Christophe Cariou, Thierry Bohner, Olivier Legrand, Erwann Davoult, Dominique Martin, Sophie The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest |
topic_facet |
Freshwater inputs Ocean acidification Ocean warming Coralline algae Maerl [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences |
description |
International audience Large stands of free living (calcareous) coralline algae - called maerl beds - play a major role as ecosystem engineers in coastal areas throughout the world. They are also subject to strong anthropogenic pressures at global and local scales, which threaten their survival. However, the macroalgal epiphytes growing on maerl may benefit from these pressures, developing to the detriment of maerl algae. Here, we sought to gain insight into how maerl beds and their epiphytic algae are disturbed by variations in the local environment, and how these variations affect their capacity to respond to global change. In 2015, we monitored three maerl beds located in the Bay of Brest (Brittany, France). Sites with contrasting conditions were selected, with one station lying in a zone close to the harbor (northern basin S1) and two stations (S2 and S3) located in areas away from the main urban effluents but subject to other sources of local change: higher currents at S3 (PREVIMER Ocean Forecast) and higher sedimentation rates at S2 (Ehrhold et al., 2016). We observed significant temporal variations of physico-chemical parameters, on an annual but also on a daily basis. Results showed that S2 differentiated itself from the other stations, this station experienced higher fluctuations of salinity, nutrient concentrations and carbonate system parameters and hosted the lowest (living) maerl biomass (4.38 ± 1.54 kg DW m -2 ). S3 observed the highest living maerl biomass (14.56 ± 1.61 kg DW m -2 ) and the lowest non-calcareous epiphytic macroalgal abundance (0.1-7.9 g DW m -2 ). S1 displayed the highest heterogeneity in terms of living maerl biomass (it varied from 0.8 to 8.6 kg DW m -2 ), and the highest Chl a content. However, we did not record differences in terms of physico-chemical parameters between S1 and S3. No positive relationship was observed between nutrient enrichment and macroalgal epiphyte abundance, but epiphyte abundance was higher at stations with lower maerl biomass (S1 and S2) (mean value ... |
author2 |
Station biologique de Roscoff = Roscoff Marine Station (SBR) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Adaptation et diversité en milieu marin (ADMM) Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff = Roscoff Marine Station (SBR) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Fédération de recherche de Roscoff (FR2424) |
format |
Article in Journal/Newspaper |
author |
Qui-Minet, Zujaila Nohemy Delaunay, Coralie Grall, Jacques Six, Christophe Cariou, Thierry Bohner, Olivier Legrand, Erwann Davoult, Dominique Martin, Sophie |
author_facet |
Qui-Minet, Zujaila Nohemy Delaunay, Coralie Grall, Jacques Six, Christophe Cariou, Thierry Bohner, Olivier Legrand, Erwann Davoult, Dominique Martin, Sophie |
author_sort |
Qui-Minet, Zujaila Nohemy |
title |
The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest |
title_short |
The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest |
title_full |
The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest |
title_fullStr |
The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest |
title_full_unstemmed |
The role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the Bay of Brest |
title_sort |
role of local environmental changes on maerl and its associated non-calcareous epiphytic flora in the bay of brest |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://insu.hal.science/insu-03684916 https://doi.org/10.1016/j.ecss.2018.04.032 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 0272-7714 EISSN: 1096-0015 Estuarine, Coastal and Shelf Science https://insu.hal.science/insu-03684916 Estuarine, Coastal and Shelf Science, 2018, 208, pp.140-152. ⟨10.1016/j.ecss.2018.04.032⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ecss.2018.04.032 insu-03684916 https://insu.hal.science/insu-03684916 BIBCODE: 2018ECSS.208.140Q doi:10.1016/j.ecss.2018.04.032 |
op_doi |
https://doi.org/10.1016/j.ecss.2018.04.032 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
208 |
container_start_page |
140 |
op_container_end_page |
152 |
_version_ |
1810469807906095104 |