Disconnection between genetic and morphological diversity in the planktonic foraminifer Neogloboquadrina pachyderma from the Indian sector of the Southern Ocean
Type | Article | ||||||||||||||||||||||||||||
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Date | 2018-10 | ||||||||||||||||||||||||||||
Language | English | ||||||||||||||||||||||||||||
Author(s) | Andre Aurore1, Quillevere Frederic2, Schiebel Ralf1, 3, Morard Raphael4, Howa Helene1, Meilland Julie1, 4, Douady Christophe J.5, 6 | ||||||||||||||||||||||||||||
Affiliation(s) | 1 : Univ Angers, UMR CNRS 6112 LPG BIAF, 2bd Lavoisier, F-49100 Angers, France. 2 : Univ Claude Bernard Lyon 1, Univ Lyon, UMR 5276 LGL TPE, ENS Lyon,CNRS, F-69622 Villeurbanne, France. 3 : Max Planck Inst Chem, Hahn Meitner Weg 1, D-55128 Mainz, Germany. 4 : Univ Bremen Univ, MARUM, Leobener Str 8, D-28359 Bremen, Germany. 5 : Univ Claude Bernard Lyon 1, Univ Lyon, UMR 5023 LEHNA, ENTPE,CNRS, F-69622 Villeurbanne, France. 6 : Inst Univ France, Paris, France. |
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Source | Marine Micropaleontology (0377-8398) (Elsevier Science Bv), 2018-10 , Vol. 144 , P. 14-24 | ||||||||||||||||||||||||||||
DOI | 10.1016/j.marmicro.2018.10.001 | ||||||||||||||||||||||||||||
WOS© Times Cited | 6 | ||||||||||||||||||||||||||||
Keyword(s) | Morphospecies, Genetic types, Polar waters, Biogeography, Morphometric analyses, Ribosomal DNA | ||||||||||||||||||||||||||||
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 morphological differentiation 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. |
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