Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone
This thesis aims at quantifying and explaining the effects of hydrodynamics on the communities of the North-East Atlantic rocky shores. In that prospect, several studies were carried out in 14 sites at the western head of Brittany, at different spatial scales, from a few metres to a hundred kilometr...
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Other Authors: | , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://theses.hal.science/tel-03169460 https://theses.hal.science/tel-03169460/document https://theses.hal.science/tel-03169460/file/These-2020-SML-Ecologie_marine-BUREL_Thomas.pdf |
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ftunivbrest:oai:HAL:tel-03169460v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
French |
topic |
Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme [SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme [SDV.EE]Life Sciences [q-bio]/Ecology environment Burel, Thomas Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
topic_facet |
Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme [SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
This thesis aims at quantifying and explaining the effects of hydrodynamics on the communities of the North-East Atlantic rocky shores. In that prospect, several studies were carried out in 14 sites at the western head of Brittany, at different spatial scales, from a few metres to a hundred kilometres. Two biological sampling methods were used for macroflora and macrofauna to study variations in the structure of macroalgal communities and seaweed dominated assemblages. A new proxy for small-scale hydrodynamics has been developed, in situ wave height.In situ wave height appears to be the most important physical factor in the internal structuring of macroalgal communities. By studying the differentiation of six macroalgal communities vertically distributed on the shore, the role of hydrodynamics seems to be minor compared to the elevation and the average duration of emersion.The shift in intertidal dominance from macroflora to macrofauna is mainly explained by in situ wave height. Sessile organisms respond differently to hydrodynamics. Interestingly, the existence of tolerance thresholds for hydrodynamics was highlighted. Within the communities dominated by macroalgae, the in situ wave height significantly modulates both the fauna-flora interactions, strong at the top and middle of the shore, and the flora-flora interactions, more important at the bottom of the intertidal zone.Studying the effect of hydrodynamics on a midintertidal macroalgal community using seven proxies revealed different community responses. The wave heights measured in situ and calculated using theSWAN model appear to be complementary in assessing the role of hydrodynamics in the structuring of macroalgal-dominated rocky intertidal ecosystems. Cette thèse vise à quantifier et à expliciter les effets de l’hydrodynamisme sur les biocénoses des estrans rocheux du Nord-Est Atlantique. Dans cette optique, plusieurs études ont été menées sur 14 sites de la pointe bretonne, à différentes échelles spatiales, de quelques mètres à une centaine de ... |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Erwan Ar Gall Jacques Grall Gauthier Schaal |
format |
Doctoral or Postdoctoral Thesis |
author |
Burel, Thomas |
author_facet |
Burel, Thomas |
author_sort |
Burel, Thomas |
title |
Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
title_short |
Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
title_full |
Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
title_fullStr |
Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
title_full_unstemmed |
Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
title_sort |
effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://theses.hal.science/tel-03169460 https://theses.hal.science/tel-03169460/document https://theses.hal.science/tel-03169460/file/These-2020-SML-Ecologie_marine-BUREL_Thomas.pdf |
long_lat |
ENVELOPE(-56.682,-56.682,49.750,49.750) |
geographic |
Western Head |
geographic_facet |
Western Head |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
https://theses.hal.science/tel-03169460 Ecologie, Environnement. Université de Bretagne occidentale - Brest, 2020. Français. ⟨NNT : 2020BRES0019⟩ |
op_relation |
NNT: 2020BRES0019 tel-03169460 https://theses.hal.science/tel-03169460 https://theses.hal.science/tel-03169460/document https://theses.hal.science/tel-03169460/file/These-2020-SML-Ecologie_marine-BUREL_Thomas.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790604951844552704 |
spelling |
ftunivbrest:oai:HAL:tel-03169460v1 2024-02-11T10:06:55+01:00 Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone Effet de l'hydrodynamisme sur la structure des communautés macroalgales et sur les interactions macroflore / macrofaune en zone intertidale Burel, Thomas Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Erwan Ar Gall Jacques Grall Gauthier Schaal 2020-03-17 https://theses.hal.science/tel-03169460 https://theses.hal.science/tel-03169460/document https://theses.hal.science/tel-03169460/file/These-2020-SML-Ecologie_marine-BUREL_Thomas.pdf fr fre HAL CCSD NNT: 2020BRES0019 tel-03169460 https://theses.hal.science/tel-03169460 https://theses.hal.science/tel-03169460/document https://theses.hal.science/tel-03169460/file/These-2020-SML-Ecologie_marine-BUREL_Thomas.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03169460 Ecologie, Environnement. Université de Bretagne occidentale - Brest, 2020. Français. ⟨NNT : 2020BRES0019⟩ Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/doctoralThesis Theses 2020 ftunivbrest 2024-01-23T23:39:20Z This thesis aims at quantifying and explaining the effects of hydrodynamics on the communities of the North-East Atlantic rocky shores. In that prospect, several studies were carried out in 14 sites at the western head of Brittany, at different spatial scales, from a few metres to a hundred kilometres. Two biological sampling methods were used for macroflora and macrofauna to study variations in the structure of macroalgal communities and seaweed dominated assemblages. A new proxy for small-scale hydrodynamics has been developed, in situ wave height.In situ wave height appears to be the most important physical factor in the internal structuring of macroalgal communities. By studying the differentiation of six macroalgal communities vertically distributed on the shore, the role of hydrodynamics seems to be minor compared to the elevation and the average duration of emersion.The shift in intertidal dominance from macroflora to macrofauna is mainly explained by in situ wave height. Sessile organisms respond differently to hydrodynamics. Interestingly, the existence of tolerance thresholds for hydrodynamics was highlighted. Within the communities dominated by macroalgae, the in situ wave height significantly modulates both the fauna-flora interactions, strong at the top and middle of the shore, and the flora-flora interactions, more important at the bottom of the intertidal zone.Studying the effect of hydrodynamics on a midintertidal macroalgal community using seven proxies revealed different community responses. The wave heights measured in situ and calculated using theSWAN model appear to be complementary in assessing the role of hydrodynamics in the structuring of macroalgal-dominated rocky intertidal ecosystems. Cette thèse vise à quantifier et à expliciter les effets de l’hydrodynamisme sur les biocénoses des estrans rocheux du Nord-Est Atlantique. Dans cette optique, plusieurs études ont été menées sur 14 sites de la pointe bretonne, à différentes échelles spatiales, de quelques mètres à une centaine de ... Doctoral or Postdoctoral Thesis North East Atlantic Université de Bretagne Occidentale: HAL Western Head ENVELOPE(-56.682,-56.682,49.750,49.750) |