Influence of sediment grain size and mineralogy on testate amoebae test construction

Testate amoebae are increasingly used for environmental monitoring as well as paleoenvironmental reconstructions. Paleoecological interpretations of testate amoebae assemblages depend on the understanding of the ecological processes operating today. We then ask the question of the link between testa...

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Published inComptes rendus. Geoscience Vol. 342; no. 9; pp. 710 - 717
Main Authors Armynot du Châtelet, Eric, Guillot, François, Recourt, Philippe, Ventalon, Sandra, Tribovillard, Nicolas
Format Journal Article
LanguageEnglish
Published Paris Elsevier SAS 01.09.2010
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Abstract Testate amoebae are increasingly used for environmental monitoring as well as paleoenvironmental reconstructions. Paleoecological interpretations of testate amoebae assemblages depend on the understanding of the ecological processes operating today. We then ask the question of the link between testate structure and its environment. This study analyses both the grain size and mineralogical assemblage of tests of common species belonging to the genus Centropyxis and Difflugia. It is concluded that grain size is a limiting factor for test construction, whereas mineral composition is not. Hence, when analyzing agglutinated testate amoebae for paleoenvironmental reconstructions, it should be taken into account the mean grain size of the sediment. A non-appropriate grain-size probably inhibits the development of a testate amoebae specific assemblage. Les thécamœbiens sont de plus en plus utilisés pour le suivi de la qualité de l’environnement ainsi que dans des reconstitutions paléoenvironnementales. Les interprétations paléoécologiques des assemblages de thécamœbiens dépendent de l’interprétation de processus écologiques actuels. On se pose donc la question du lien entre la structure de la thèque et son environnement. L’objet de cette étude est d’étudier aussi bien la taille des grains, que les assemblages minéralogiques des tests d’espèces communes telles que celles appartenant aux genres Centropyxis et Difflugia. Cette étude conclut que la taille des grains est un facteur limitant pour la construction des tests, alors que la composition minéralogique ne l’est pas. Ainsi, lorsque l’on analyse les thécamœbiens agglutinés, dans l’objectif de les utiliser pour des reconstitutions paléoenvironnementales, on doit tenir compte de la taille des grains du sédiment. Une taille non appropriée peut ne pas faciliter la construction des thèques et ainsi provoquer une modification de la composition de l’assemblage de thécamœbiens.
AbstractList Testate amoebae are increasingly used for environmental monitoring as well as paleoenvironmental reconstructions. Paleoecological interpretations of testate amoebae assemblages depend on the understanding of the ecological processes operating today. We then ask the question of the link between testate structure and its environment. This study analyses both the grain size and mineralogical assemblage of tests of common species belonging to the genus Centropyxis and Difflugia. It is concluded that grain size is a limiting factor for test construction, whereas mineral composition is not. Hence, when analyzing agglutinated testate amoebae for paleoenvironmental reconstructions, it should be taken into account the mean grain size of the sediment. A non-appropriate grain-size probably inhibits the development of a testate amoebae specific assemblage. Les thécamœbiens sont de plus en plus utilisés pour le suivi de la qualité de l’environnement ainsi que dans des reconstitutions paléoenvironnementales. Les interprétations paléoécologiques des assemblages de thécamœbiens dépendent de l’interprétation de processus écologiques actuels. On se pose donc la question du lien entre la structure de la thèque et son environnement. L’objet de cette étude est d’étudier aussi bien la taille des grains, que les assemblages minéralogiques des tests d’espèces communes telles que celles appartenant aux genres Centropyxis et Difflugia. Cette étude conclut que la taille des grains est un facteur limitant pour la construction des tests, alors que la composition minéralogique ne l’est pas. Ainsi, lorsque l’on analyse les thécamœbiens agglutinés, dans l’objectif de les utiliser pour des reconstitutions paléoenvironnementales, on doit tenir compte de la taille des grains du sédiment. Une taille non appropriée peut ne pas faciliter la construction des thèques et ainsi provoquer une modification de la composition de l’assemblage de thécamœbiens.
Author Ventalon, Sandra
Armynot du Châtelet, Eric
Tribovillard, Nicolas
Guillot, François
Recourt, Philippe
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Cites_doi 10.1111/j.1550-7408.1999.tb05121.x
10.1016/0009-2541(78)90007-4
10.1080/00222938800770111
10.1111/j.1550-7408.1988.tb04147.x
10.2307/3225141
10.1016/S0277-3791(01)00036-1
10.1007/BF00678110
10.1023/A:1007942301638
10.1007/BF02692208
10.1016/0040-8166(74)90049-4
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Issue 9
Keywords Grain size
Testate amoebae
Lacustrine environments
Alpine lakes
Thécamœbiens
Composition minéralogique
Taille des grains
Mineralogical composition
Lacs alpins
mineralogy
mineral composition
paleoenvironment
grain size
paleoecology
tests
interpretation
lacustrine environment
reconstruction
lakes
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Snippet Testate amoebae are increasingly used for environmental monitoring as well as paleoenvironmental reconstructions. Paleoecological interpretations of testate...
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SubjectTerms Alpine lakes
Composition minéralogique
Earth sciences
Earth, ocean, space
Exact sciences and technology
Grain size
Invertebrate paleontology
Lacs alpins
Lacustrine environments
Mineralogical composition
Mineralogy
Paleontology
Silicates
Taille des grains
Testate amoebae
Thécamœbiens
Title Influence of sediment grain size and mineralogy on testate amoebae test construction
URI https://dx.doi.org/10.1016/j.crte.2010.05.002
Volume 342
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