Disconnection between genetic and morphological diversity in the planktonic foraminifer Neogloboquadrina pachyderma from the Indian sector of the Southern Ocean

Aurore Andre 1 Frédéric Quillévéré 2 Ralf Schiebel 3, 1 Raphaël Morard 4 Hélène Howa 1 Julie Meilland 1, 4 Christophe Douady 5
1 LPG-BIAF - Laboratoire de Planétologie et Géodynamique - Bio-Indicateurs Actuels et Fossiles
LPG - Laboratoire de Planétologie et Géodynamique UMR6112
2 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon]
3 Max-Planck-Institut für Biophysikalische Chemie - Max Planck Institute for Biophysical Chemistry [Göttingen]
4 MARUM - Center for Marine Environmental Sciences [Bremen]
5 LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés
Abstract : Eight SSU rDNA genetic types have been described in the planktonic foraminifera Neogloboquadrina pachyderma, but the level of correlation between genetic diversity and morphological variation remains unknown in this morphospecies. In this study, we combine molecular and morphometric analyses of specimens of N. pachyderma sampled during two consecutive years across a latitudinal gradient in the Indian sector of the Southern Ocean. We observe that three genetic types of N. pachyderma inhabit the (sub-)polar waters of the southern Indian Ocean where they have equivalent regional distributions to those previously observed in the South Atlantic. The geographic ranges of these genetic types are largely overlapping. Our morphometric data show that contrary to other planktonic foraminiferal morphospecies, there is no relationship between genetic diversity and morpho- logical di␣erentiation in at least two of the austral representatives of N. pachyderma (Type III and Type IV) despite a high morphological variability and large genetic distance between these types. These genetic types of N. pachyderma in the southern Indian Ocean thus constitute true cryptic species of planktonic foraminifera.
Keywords : Morphospecies Genetic types Polar waters Biogeography Morphometric analyses Ribosomal DNA
Document type :
Journal articles
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Submitted on : Tuesday, June 11, 2019 - 10:13:01 AM
Last modification on : Thursday, February 20, 2020 - 7:23:21 PM

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Aurore Andre, Frédéric Quillévéré, Ralf Schiebel, Raphaël Morard, Hélène Howa, et al.. Disconnection between genetic and morphological diversity in the planktonic foraminifer Neogloboquadrina pachyderma from the Indian sector of the Southern Ocean. Marine Micropaleontology, Elsevier, 2018, 144, pp.14-24. ⟨10.1016/j.marmicro.2018.10.001⟩. ⟨hal-02152105⟩

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