Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma
Morphospecies of planktonic foraminifera are clusters of eco-genotypes that show small but significant shell morphological differences (pseudo-cryptic species).This discovery opens a new perspective for improving the accuracy and resolving power of paleoceanographic reconstructions. Unfortunately, c...
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ftinsu:oai:HAL:tel-01048643v1 2023-06-18T03:41:45+02:00 Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma Taxonomies moléculaire et morphologique chez les foraminifères planctoniques : élaboration d'un référentiel et cas particuliers de Globigerinoides sacculifer et Neogloboquadrina pachyderma André, Aurore Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Université Claude Bernard - Lyon I Frédéric Quillévéré Gilles Escarguel Thibault de Garidel-Thoron 2013-11-14 https://theses.hal.science/tel-01048643 https://theses.hal.science/tel-01048643/document https://theses.hal.science/tel-01048643/file/TH2013_Andre_Aurore_V_Expurgee.pdf fr fre HAL CCSD NNT: 2013LYO10200 tel-01048643 https://theses.hal.science/tel-01048643 https://theses.hal.science/tel-01048643/document https://theses.hal.science/tel-01048643/file/TH2013_Andre_Aurore_V_Expurgee.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01048643 Paléontologie. Université Claude Bernard - Lyon I, 2013. Français. ⟨NNT : 2013LYO10200⟩ Planktonic foraminifera Taxonomic units ABGD GMYC SSUrDNA and ITSrDNA Biogeography Morphometry Ecophenotypes Foraminifères planctoniques Unités taxonomiques SSUrDNA et ITSrDNA Biogéographie Morphométrie Écophénotypes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology info:eu-repo/semantics/doctoralThesis Theses 2013 ftinsu 2023-06-06T01:31:31Z Morphospecies of planktonic foraminifera are clusters of eco-genotypes that show small but significant shell morphological differences (pseudo-cryptic species).This discovery opens a new perspective for improving the accuracy and resolving power of paleoceanographic reconstructions. Unfortunately, current genetic type delimitations suffer subjectivity, inducing non-homogenous taxonomic status while homogenous taxonomic status is a prerequisite for including genetic types in reconstruction models. By applying quantitative and complementary methods for taxonomic units delimitation to the available dataset of partial sequences of SSU (ribosomal small sub-unit), we delimited 49 genuine (pseudo)cryptic species of planktonic foraminifera. We studied two paleoceanographic key-species. Complete sequencing of the SSU and morpho-genetic comparison within austral (sub)polar genetic types of Neogloboquadrina pachyderma lead to a new phylogeographic hypothesis and showed that morphological variations are the result of ecophenotypic effects and are not related with genetic types. The morphologically diverse Globigerinoides sacculifer is the first case of a planktonic foraminifera morphospecies corresponding to a single genetic type distributed world-wide in (sub) tropical waters. These two cases show that, contrary to previous studies conclusions, pseudo-cryptic speciation is not a rule within planktonicForaminifera Les morpho-espèces de foraminifères planctoniques sont composées d'éco-génotypes parfois différentiables sur la base de la morphologie de leur coquille. Cette découverte récente d'une diversité ainsi qualifiée de « pseudo-cryptique » ouvre des perspectives d'amélioration de la précision des reconstructions paléocéanographiques. Malheureusement, ces génotypes ont été définis de façon subjective et ne sont pas homogènes quant à leur rang taxonomique, ce qui est pourtant un pré-requis pour leur intégration dans les modèles de reconstruction. Grâce à l'application de méthodes quantitatives de délimitation d'unités ... Doctoral or Postdoctoral Thesis Neogloboquadrina pachyderma Planktonic foraminifera Institut national des sciences de l'Univers: HAL-INSU Austral Découverte ENVELOPE(141.558,141.558,-66.775,-66.775) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
French |
topic |
Planktonic foraminifera Taxonomic units ABGD GMYC SSUrDNA and ITSrDNA Biogeography Morphometry Ecophenotypes Foraminifères planctoniques Unités taxonomiques SSUrDNA et ITSrDNA Biogéographie Morphométrie Écophénotypes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
spellingShingle |
Planktonic foraminifera Taxonomic units ABGD GMYC SSUrDNA and ITSrDNA Biogeography Morphometry Ecophenotypes Foraminifères planctoniques Unités taxonomiques SSUrDNA et ITSrDNA Biogéographie Morphométrie Écophénotypes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology André, Aurore Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma |
topic_facet |
Planktonic foraminifera Taxonomic units ABGD GMYC SSUrDNA and ITSrDNA Biogeography Morphometry Ecophenotypes Foraminifères planctoniques Unités taxonomiques SSUrDNA et ITSrDNA Biogéographie Morphométrie Écophénotypes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
description |
Morphospecies of planktonic foraminifera are clusters of eco-genotypes that show small but significant shell morphological differences (pseudo-cryptic species).This discovery opens a new perspective for improving the accuracy and resolving power of paleoceanographic reconstructions. Unfortunately, current genetic type delimitations suffer subjectivity, inducing non-homogenous taxonomic status while homogenous taxonomic status is a prerequisite for including genetic types in reconstruction models. By applying quantitative and complementary methods for taxonomic units delimitation to the available dataset of partial sequences of SSU (ribosomal small sub-unit), we delimited 49 genuine (pseudo)cryptic species of planktonic foraminifera. We studied two paleoceanographic key-species. Complete sequencing of the SSU and morpho-genetic comparison within austral (sub)polar genetic types of Neogloboquadrina pachyderma lead to a new phylogeographic hypothesis and showed that morphological variations are the result of ecophenotypic effects and are not related with genetic types. The morphologically diverse Globigerinoides sacculifer is the first case of a planktonic foraminifera morphospecies corresponding to a single genetic type distributed world-wide in (sub) tropical waters. These two cases show that, contrary to previous studies conclusions, pseudo-cryptic speciation is not a rule within planktonicForaminifera Les morpho-espèces de foraminifères planctoniques sont composées d'éco-génotypes parfois différentiables sur la base de la morphologie de leur coquille. Cette découverte récente d'une diversité ainsi qualifiée de « pseudo-cryptique » ouvre des perspectives d'amélioration de la précision des reconstructions paléocéanographiques. Malheureusement, ces génotypes ont été définis de façon subjective et ne sont pas homogènes quant à leur rang taxonomique, ce qui est pourtant un pré-requis pour leur intégration dans les modèles de reconstruction. Grâce à l'application de méthodes quantitatives de délimitation d'unités ... |
author2 |
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Université Claude Bernard - Lyon I Frédéric Quillévéré Gilles Escarguel Thibault de Garidel-Thoron |
format |
Doctoral or Postdoctoral Thesis |
author |
André, Aurore |
author_facet |
André, Aurore |
author_sort |
André, Aurore |
title |
Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma |
title_short |
Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma |
title_full |
Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma |
title_fullStr |
Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma |
title_full_unstemmed |
Morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of Globigerinoides sacculifer and Neogloboquadrina pachyderma |
title_sort |
morphological and molecular taxonomies of planktonic foraminifera : design of a taxonomic framework and special cases of globigerinoides sacculifer and neogloboquadrina pachyderma |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://theses.hal.science/tel-01048643 https://theses.hal.science/tel-01048643/document https://theses.hal.science/tel-01048643/file/TH2013_Andre_Aurore_V_Expurgee.pdf |
long_lat |
ENVELOPE(141.558,141.558,-66.775,-66.775) |
geographic |
Austral Découverte |
geographic_facet |
Austral Découverte |
genre |
Neogloboquadrina pachyderma Planktonic foraminifera |
genre_facet |
Neogloboquadrina pachyderma Planktonic foraminifera |
op_source |
https://theses.hal.science/tel-01048643 Paléontologie. Université Claude Bernard - Lyon I, 2013. Français. ⟨NNT : 2013LYO10200⟩ |
op_relation |
NNT: 2013LYO10200 tel-01048643 https://theses.hal.science/tel-01048643 https://theses.hal.science/tel-01048643/document https://theses.hal.science/tel-01048643/file/TH2013_Andre_Aurore_V_Expurgee.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1769007414524248064 |