Renewal of planktonic foraminifera diversity after the Cretaceous Paleogene mass extinction by benthic colonizers

Morard, Raphaël; Hassenrück, Christiane; Greco, Mattia; Fernàndez-Guerra, Antonio; Rigaud, Sylvain; Douady, Christophe J.; Kučera, Michal

doi:10.1038/s41467-022-34794-5

Cited by 7 publications

(5 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, assessing the extent of the diversity of the group using single‐cell analyses alone would have been difficult to achieve because a robust estimation would have required complete global sampling and Sanger sequencing for every morphospecies. These limitations can in principle be overcome by environmental sequencing but the interpretation of the metabarcoding data set is complicated by the pervasive intra‐genomic diversity of foraminifera (Weber & Pawlowski, 2014; Greco et al ., 2023), and by the presence of benthic foraminifera DNA in the water column (Morard et al ., 2022). To solve this entanglement of ‘diversities’ in our metabarcoding data set, we designed a stepwise approach, starting by parsing the benthic and planktonic foraminifera ASVs and then used our molecular nomenclature to expand its properties on the planktonic foraminifera ASVs.…”

Section: Discussionmentioning

confidence: 99%

“…Planktonic foraminifera are a polyphyletic group (Morard et al ., 2022) constituted of three major clades (spinose, non‐spinose, and microperforate) and two additional phylogenetically unrelated species: Neogallitellia vivans and Dentigloborotalia anfracta . We built the molecular nomenclature independently for 80 basetypes of the spinose clade, 206 of the non‐spinose clade, and 59 of the microperforate clade.…”

Section: Data Standardisation Through Molecular Taxonomymentioning

confidence: 99%

“…In our case, categorising ASVs as either planktonic or benthic foraminifera based solely on their occurrence in the water column or sediments is not possible. This is because planktonic sequences can be found in the benthos due to the sequestration of organic matter from the surface ocean to its base (Morard et al ., 2017; Barrenechea Angeles et al ., 2020; Cordier et al ., 2022), and also because benthic foraminifera of the clade Globothalamea actively disperse into the plankton (Morard et al ., 2022). Moreover, there is no unique genetic gap separating benthic and planktonic foraminifera due to the variability in their evolutionary rates (Darling et al ., 1997; de Vargas & Pawlowski, 1998).…”

Section: Data Standardisation Through Molecular Taxonomymentioning

confidence: 99%

See 2 more Smart Citations

The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in plankton

Morard,

Darling,

Weiner

et al. 2024

Biological Reviews

Self Cite

View full text Add to dashboard Cite

The nature and extent of diversity in the plankton has fascinated scientists for over a century. Initially, the discovery of many new species in the remarkably uniform and unstructured pelagic environment appeared to challenge the concept of ecological niches. Later, it became obvious that only a fraction of plankton diversity had been formally described, because plankton assemblages are dominated by understudied eukaryotic lineages with small size that lack clearly distinguishable morphological features. The high diversity of the plankton has been confirmed by comprehensive metabarcoding surveys, but interpretation of the underlying molecular taxonomies is hindered by insufficient integration of genetic diversity with morphological taxonomy and ecological observations. Here we use planktonic foraminifera as a study model and reveal the full extent of their genetic diversity and investigate geographical and ecological patterns in their distribution. To this end, we assembled a global data set of ~7600 ribosomal DNA sequences obtained from morphologically characterised individual foraminifera, established a robust molecular taxonomic framework for the observed diversity, and used it to query a global metabarcoding data set covering ~1700 samples with ~2.48 billion reads. This allowed us to extract and assign 1 million reads, enabling characterisation of the structure of the genetic diversity of the group across ~1100 oceanic stations worldwide. Our sampling revealed the existence of, at most, 94 distinct molecular operational taxonomic units (MOTUs) at a level of divergence indicative of biological species. The genetic diversity only doubles the number of formally described species identified by morphological features. Furthermore, we observed that the allocation of genetic diversity to morphospecies is uneven. Only 16 morphospecies disguise evolutionarily significant genetic diversity, and the proportion of morphospecies that show genetic diversity increases poleward. Finally, we observe that MOTUs have a narrower geographic distribution than morphospecies and that in some cases the MOTUs belonging to the same morphospecies (cryptic species) have different environmental preferences. Overall, our analysis reveals that even in the light of global genetic sampling, planktonic foraminifera diversity is modest and finite. However, the extent and structure of the cryptic diversity reveals that genetic diversification is decoupled from morphological diversification, hinting at different mechanisms acting at different levels of divergence.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Data Standardisation Through Molecular Taxonomymentioning

confidence: 99%

Section: Data Standardisation Through Molecular Taxonomymentioning

confidence: 99%

See 1 more Smart Citation

The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in plankton

Morard,

Darling,

Weiner

et al. 2024

Biological Reviews

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is extremely important to understand the living plankton and to put the modern taxa in the context of their taxonomic history and fossil record (Morard et al . 2022). A taxonomic review of the living planktonic foraminifera was undertaken by Brummer & Kučera (2022), in which they recognized 50 extant species living in the modern oceans.…”

Section: Figmentioning

confidence: 99%

Bridging the extant and fossil record of planktonic foraminifera: implications for the Globigerina lineage

Fabbrini,

Greco,

Iacoviello

et al. 2023

Palaeontology

Self Cite

View full text Add to dashboard Cite

We conducted a morphometric study and wall texture analysis on extant and fossil specimens of the planktonic foraminifera Globigerina falconensis plexus. Our global data reveal morphological inconsistencies between fossil and extant populations. Our results are significant as G. falconensis is widely used in palaeoceanographic studies in conjunction with its sister taxon G. bulloides. Morphologically these two species are similar, with the main difference being the distinctive apertural lip present in G. falconensis. We selected cores covering the entire stratigraphic range of G. falconensis, from the early Miocene to current day, spanning sites from high latitudes in the North Atlantic Ocean and the southern Indian Ocean to sites in equatorial regions. The morphology found in the modern ocean is not consistent with the Miocene holotype of Globigerina falconensis Blow described from lower Miocene sediments in Venezuela. A more lobate morphology evolved in the late Miocene, thus, a new name is required for this morphotype, coexisting in the modern oceans with G. falconensis s.s. We thus describe the new morphospecies, G. neofalconensis for the more lobate forms which evolved in the late Miocene and inhabit the modern oceans. Additionally, we report a pseudocancellate wall texture present in the G. falconensis plexus. We use the molecular sequences from the PR2 database to explore the generic attribution of the G. falconensis lineage, confirming its close relationship with G. bulloides and its retention in the genus Globigerina.

show abstract

“…Even after mass extinctions, such as at the K-Pg boundary, these basic fourchambered forms, e.g. Eoglobigerina, were among the first groups to reappear in the fossil record (Olsson et al, 2006;Morard et al, 2022). All of these similarities and convergent evolution have constituted a problem in the classification.…”

Section: Introductionmentioning

confidence: 99%

Rediscovering Globigerina bollii Cita and Premoli Silva 1960

Fabbrini,

Petrizzo,

Silva

et al. 2024

J. Micropalaeontol.

View full text Add to dashboard Cite

Abstract. Globigerina bollii Cita and Premoli Silva was described from the historical Langhian-type section in Langhe, Piedmont (Italy). Due to its peculiar compact morphology, it was set apart from all the other globigerinids typical of the coeval Mediterranean fauna, and it was only reported for a short and limited stratigraphic range. The taxon became a first-order marker for the local biostratigraphy with its own Globigerina bollii Zone within the Langhian stage. However, the species was later synonymised with Globigerina falconensis Blow, ending its use in biostratigraphic schemes, and it was no longer utilised by authors working in the Mediterranean area and Paratethys. We present a reassessment of Globigerina bollii, showing for the first time a full collection of high-quality scanning electron and optical microscope images of the type series of specimens and a comparative study with Mediterranean individuals from the Langhian of the Cretaccio Section (Italy) and extra-Mediterranean individuals from Ocean Drilling Program Site 747 in the Kerguelen Plateau (Indian Ocean). The stratigraphic ranges of all the occurrences cited in the scientific literature from 1960 to the present day and all the references including images of the taxon are compiled. We compare G. bollii to other four-chambered morphospecies inhabiting the oceans during the Miocene, providing a detailed discussion of their morphological differences, which allows us to retain G. bollii as a valid taxon and to disclaim its synonymy with Globigerina falconensis. Our taxonomical observations also allow us to reassign Globigerina bollii to the genus Globoturborotalita, due to its strong affinities with other members of that genus, such as G. eolabiacrassata Spezzaferri and Coxall, and G. ouachitaensis (Howe and Wallace). We present a direct visual comparison with the other representatives of middle Miocene globoturborotaliids. An additional comparison is also discussed with Globigerina bollii lentiana Rögl, a species endemic in the Paratethys. We conclude that the presence of G. bollii in the Mediterranean Basin during such a confined stratigraphic interval (Mediterranean Subzone MMi4c–MMi4d), might be a palaeogeographical indicator of the intermittent opening of the eastern gateway with the Paratethys, affecting the Mediterranean faunas during the Langhian and their migration from oceanic realms into the Paratethys and Mediterranean.

show abstract

Renewal of planktonic foraminifera diversity after the Cretaceous Paleogene mass extinction by benthic colonizers

Cited by 7 publications

References 53 publications

The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in plankton

The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in plankton

Bridging the extant and fossil record of planktonic foraminifera: implications for the Globigerina lineage

Rediscovering Globigerina bollii Cita and Premoli Silva 1960

Contact Info

Product

Resources

About