10.5061/DRYAD.RB06J
Quillevere, Frederic
André, Aurore
Weiner, Agnes
Aurahs, Ralf
Morard, Raphaël
Douady, Christophe J.
University of Lyon System
de Garidel-Thoron, Thibault
Escarguel, Gilles
de Vargas, Colomban
Kucera, Michal
Data from: The cryptic and the apparent reversed: lack of genetic
differentiation within the morphologically diverse plexus of the
planktonic foraminifer Globigerinoides sacculifer
Dryad
dataset
2012
species concept
Planktonic foraminifera
ribosomal DNA
Globigerinoides sacculifer
2012-07-25T20:44:30Z
2012-07-25T20:44:30Z
en
https://doi.org/10.1666/0094-8373-39.1.21
80896 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
Supplement Table1_ANDRE ET AL_2013Supplementary information on individuals
of the Globigerinoides sacculifer plexus sequenced in the work by André et
al. (2013)