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 in | Comptes rendus. Geoscience Vol. 342; no. 9; pp. 710 - 717 |
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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. |
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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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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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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 |
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