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The cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer

Previous genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species p... Full description

Journal Title: Paleobiology 2012-12, Vol.39 (1), p.21-39
Main Author: André, Aurore
Other Authors: Weiner, Agnes , Quillévéré, Frédéric , Aurahs, Ralf , Morard, Raphaël , Douady, Christophe J , de Garidel-Thoron, Thibault , Escarguel, Gilles , de Vargas, Colomban , Kucera, Michal
Format: Electronic Article Electronic Article
Language: English
Subjects:
DNA
s
Quelle: Alma/SFX Local Collection
Publisher: New York, USA: The Paleontological Society
ID: ISSN: 0094-8373
Link: https://hal.archives-ouvertes.fr/hal-00797451
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title: The cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer
format: Article
creator:
  • André, Aurore
  • Weiner, Agnes
  • Quillévéré, Frédéric
  • Aurahs, Ralf
  • Morard, Raphaël
  • Douady, Christophe J
  • de Garidel-Thoron, Thibault
  • Escarguel, Gilles
  • de Vargas, Colomban
  • Kucera, Michal
subjects:
  • Articles
  • Atlantic Ocean
  • Biodiversity
  • Biodiversity and Ecology
  • Biological taxonomies
  • DNA
  • Earth Sciences
  • Ecology
  • Environmental Sciences
  • Evolution
  • Evolutionary genetics
  • Foraminifera
  • Fossils
  • Genetic variation
  • genetics
  • Globigerinacea
  • Globigerinidae
  • Globigerinoides
  • Globigerinoides sacculifer
  • Haplotypes
  • Indian Ocean
  • Invertebrata
  • invertebrate
  • Life Sciences
  • living taxa
  • morphology
  • nucleic acids
  • Oceans
  • Pacific Ocean
  • Paleontology
  • Phylogenetics
  • Plankton
  • planktonic taxa
  • Plexus
  • Populations
  • Populations and Evolution
  • Protista
  • Ribosomal DNA
  • Rotaliina
  • s
  • Sciences of the Universe
  • Species
  • Systematics
  • Systematics, Phylogenetics and taxonomy
  • taxonomy
ispartof: Paleobiology, 2012-12, Vol.39 (1), p.21-39
description: Previous genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species plexus Globigerinoides sacculifer is characterized by large morphological variability, which has led to the proliferation of taxonomic names attributed to morphological end-members within the plexus. In order to clarify the taxonomic status of its morphotypes and to investigate the genetic connectivity among its currently partly disjunct (sub)tropical populations, we carried out a global survey of two ribosomal RNA regions (SSU and ITS-1) in all recent morphotypes of the plexus collected throughout (sub)tropical surface waters of the global ocean. Unexpectedly, we find an extremely reduced genetic variation within the plexus and no correlation between genetic and morphological divergence, suggesting taxonomical overinterpretation. The genetic homogeneity within the morphospecies is unexpected, considering its partly disjunct range in the (sub)tropical Atlantic and Indo-Pacific and its old age (early Miocene). A sequence variant in the rapidly evolving ITS-1 region indicates the existence of an exclusively Atlantic haplotype, which suggests an episode of relatively recent (last glacial) isolation, followed by subsequent resumption of unidirectional gene flow from the Indo-Pacific into the Atlantic. This is the first example in planktonic foraminifera where the morphological variability in a morphospecies exceeds its rDNA genetic variability. Such evidence for inconsistent scaling of morphological and genetic diversity in planktonic foraminifera could complicate the interpretation of evolutionary patterns in their fossil record.
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0094-8373
fulltext: fulltext
issn:
  • 0094-8373
  • 1938-5331
url: Link


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titleThe cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer
sourceAlma/SFX Local Collection
creatorAndré, Aurore ; Weiner, Agnes ; Quillévéré, Frédéric ; Aurahs, Ralf ; Morard, Raphaël ; Douady, Christophe J ; de Garidel-Thoron, Thibault ; Escarguel, Gilles ; de Vargas, Colomban ; Kucera, Michal
creatorcontribAndré, Aurore ; Weiner, Agnes ; Quillévéré, Frédéric ; Aurahs, Ralf ; Morard, Raphaël ; Douady, Christophe J ; de Garidel-Thoron, Thibault ; Escarguel, Gilles ; de Vargas, Colomban ; Kucera, Michal
descriptionPrevious genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species plexus Globigerinoides sacculifer is characterized by large morphological variability, which has led to the proliferation of taxonomic names attributed to morphological end-members within the plexus. In order to clarify the taxonomic status of its morphotypes and to investigate the genetic connectivity among its currently partly disjunct (sub)tropical populations, we carried out a global survey of two ribosomal RNA regions (SSU and ITS-1) in all recent morphotypes of the plexus collected throughout (sub)tropical surface waters of the global ocean. Unexpectedly, we find an extremely reduced genetic variation within the plexus and no correlation between genetic and morphological divergence, suggesting taxonomical overinterpretation. The genetic homogeneity within the morphospecies is unexpected, considering its partly disjunct range in the (sub)tropical Atlantic and Indo-Pacific and its old age (early Miocene). A sequence variant in the rapidly evolving ITS-1 region indicates the existence of an exclusively Atlantic haplotype, which suggests an episode of relatively recent (last glacial) isolation, followed by subsequent resumption of unidirectional gene flow from the Indo-Pacific into the Atlantic. This is the first example in planktonic foraminifera where the morphological variability in a morphospecies exceeds its rDNA genetic variability. Such evidence for inconsistent scaling of morphological and genetic diversity in planktonic foraminifera could complicate the interpretation of evolutionary patterns in their fossil record.
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subjectArticles ; Atlantic Ocean ; Biodiversity ; Biodiversity and Ecology ; Biological taxonomies ; DNA ; Earth Sciences ; Ecology ; Environmental Sciences ; Evolution ; Evolutionary genetics ; Foraminifera ; Fossils ; Genetic variation ; genetics ; Globigerinacea ; Globigerinidae ; Globigerinoides ; Globigerinoides sacculifer ; Haplotypes ; Indian Ocean ; Invertebrata ; invertebrate ; Life Sciences ; living taxa ; morphology ; nucleic acids ; Oceans ; Pacific Ocean ; Paleontology ; Phylogenetics ; Plankton ; planktonic taxa ; Plexus ; Populations ; Populations and Evolution ; Protista ; Ribosomal DNA ; Rotaliina ; s ; Sciences of the Universe ; Species ; Systematics ; Systematics, Phylogenetics and taxonomy ; taxonomy
ispartofPaleobiology, 2012-12, Vol.39 (1), p.21-39
rights
0Copyright © The Paleontological Society
1GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Abstract, Copyright, The Paleontological Society
22013 The Paleontological Society
3Distributed under a Creative Commons Attribution 4.0 International License
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descriptionPrevious genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species plexus Globigerinoides sacculifer is characterized by large morphological variability, which has led to the proliferation of taxonomic names attributed to morphological end-members within the plexus. In order to clarify the taxonomic status of its morphotypes and to investigate the genetic connectivity among its currently partly disjunct (sub)tropical populations, we carried out a global survey of two ribosomal RNA regions (SSU and ITS-1) in all recent morphotypes of the plexus collected throughout (sub)tropical surface waters of the global ocean. Unexpectedly, we find an extremely reduced genetic variation within the plexus and no correlation between genetic and morphological divergence, suggesting taxonomical overinterpretation. The genetic homogeneity within the morphospecies is unexpected, considering its partly disjunct range in the (sub)tropical Atlantic and Indo-Pacific and its old age (early Miocene). A sequence variant in the rapidly evolving ITS-1 region indicates the existence of an exclusively Atlantic haplotype, which suggests an episode of relatively recent (last glacial) isolation, followed by subsequent resumption of unidirectional gene flow from the Indo-Pacific into the Atlantic. This is the first example in planktonic foraminifera where the morphological variability in a morphospecies exceeds its rDNA genetic variability. Such evidence for inconsistent scaling of morphological and genetic diversity in planktonic foraminifera could complicate the interpretation of evolutionary patterns in their fossil record.
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37Ribosomal DNA
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titleThe cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer
authorAndré, Aurore ; Weiner, Agnes ; Quillévéré, Frédéric ; Aurahs, Ralf ; Morard, Raphaël ; Douady, Christophe J ; de Garidel-Thoron, Thibault ; Escarguel, Gilles ; de Vargas, Colomban ; Kucera, Michal
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abstractPrevious genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species plexus Globigerinoides sacculifer is characterized by large morphological variability, which has led to the proliferation of taxonomic names attributed to morphological end-members within the plexus. In order to clarify the taxonomic status of its morphotypes and to investigate the genetic connectivity among its currently partly disjunct (sub)tropical populations, we carried out a global survey of two ribosomal RNA regions (SSU and ITS-1) in all recent morphotypes of the plexus collected throughout (sub)tropical surface waters of the global ocean. Unexpectedly, we find an extremely reduced genetic variation within the plexus and no correlation between genetic and morphological divergence, suggesting taxonomical overinterpretation. The genetic homogeneity within the morphospecies is unexpected, considering its partly disjunct range in the (sub)tropical Atlantic and Indo-Pacific and its old age (early Miocene). A sequence variant in the rapidly evolving ITS-1 region indicates the existence of an exclusively Atlantic haplotype, which suggests an episode of relatively recent (last glacial) isolation, followed by subsequent resumption of unidirectional gene flow from the Indo-Pacific into the Atlantic. This is the first example in planktonic foraminifera where the morphological variability in a morphospecies exceeds its rDNA genetic variability. Such evidence for inconsistent scaling of morphological and genetic diversity in planktonic foraminifera could complicate the interpretation of evolutionary patterns in their fossil record.
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pubThe Paleontological Society
doi10.1666/0094-8373-39.1.21
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