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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Online Access: | http://www.theses.fr/2020BRES0019/document |
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fttriple:oai:gotriple.eu:10670/1.ucjd0r 2023-05-15T17:38:42+02:00 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 Brest Ar Gall, Erwan Grall, Jacques Schaal, Gauthier 2020-03-17 http://www.theses.fr/2020BRES0019/document fr fre 10670/1.ucjd0r http://www.theses.fr/2020BRES0019/document Theses.fr Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics geo envir Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2020 fttriple 2023-01-22T17:00:00Z 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 ... Thesis North East Atlantic Unknown Western Head ENVELOPE(-56.682,-56.682,49.750,49.750) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
French |
topic |
Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics geo envir |
spellingShingle |
Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics geo envir Burel, Thomas Effect of hydrodynamics on the structure of macroalgal communities and on the interactions between macroflora / macrofauna in the intertidal zone |
topic_facet |
Macroalgues Communautés Estrans rocheux Assemblages faune-flore Hydrodynamisme Macroalgae Communities Rocky shores Fauna-flora Assemblages Hydrodynamics geo envir |
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 |
Brest Ar Gall, Erwan Grall, Jacques Schaal, Gauthier |
format |
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 |
publishDate |
2020 |
url |
http://www.theses.fr/2020BRES0019/document |
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 |
Theses.fr |
op_relation |
10670/1.ucjd0r http://www.theses.fr/2020BRES0019/document |
_version_ |
1766139249237688320 |