1
|
Morard R, Darling KF, Weiner AKM, Hassenrück C, Vanni C, Cordier T, Henry N, Greco M, Vollmar NM, Milivojevic T, Rahman SN, Siccha M, Meilland J, Jonkers L, Quillévéré F, Escarguel G, Douady CJ, de Garidel-Thoron T, de Vargas C, Kucera M. The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in plankton. Biol Rev Camb Philos Soc 2024; 99:1218-1241. [PMID: 38351434 DOI: 10.1111/brv.13065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 02/04/2024] [Accepted: 02/07/2024] [Indexed: 07/06/2024]
Abstract
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.
Collapse
Affiliation(s)
- Raphaël Morard
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| | - Kate F Darling
- School of GeoSciences, University of Edinburgh, Edinburgh, EH9 3JW, UK
- Biological and Environmental Sciences, University of Stirling, Stirling, FK9 4LA, UK
| | - Agnes K M Weiner
- NORCE Climate and Environment, NORCE Norwegian Research Centre AS, Bjerknes Centre for Climate Research, Jahnebakken 5, Bergen, 5007, Norway
| | - Christiane Hassenrück
- Biological Oceanography, Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Seestrasse 15, Warnemünde, 18119, Germany
| | - Chiara Vanni
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| | - Tristan Cordier
- NORCE Climate and Environment, NORCE Norwegian Research Centre AS, Bjerknes Centre for Climate Research, Jahnebakken 5, Bergen, 5007, Norway
| | - Nicolas Henry
- CNRS, Sorbonne Université, FR2424, ABiMS, Station Biologique de Roscoff, Roscoff, 29680, France
- Research Federation for the Study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, Paris, 75016, France
| | - Mattia Greco
- Institut de Ciències del Mar, Passeig Marítim de la Barceloneta, Barcelona, 37-49, Spain
| | - Nele M Vollmar
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
- NORCE Climate and Environment, NORCE Norwegian Research Centre AS, Bjerknes Centre for Climate Research, Jahnebakken 5, Bergen, 5007, Norway
| | - Tamara Milivojevic
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
- Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Shirin Nurshan Rahman
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| | - Michael Siccha
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| | - Julie Meilland
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| | - Lukas Jonkers
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| | - Frédéric Quillévéré
- Univ Lyon, Université Claude Bernard Lyon 1, ENS de Lyon, CNRS, UMR CNRS 5276 LGL-TPE, Villeurbanne, F-69622, France
| | - Gilles Escarguel
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, Villeurbanne, F-69622, France
| | - Christophe J Douady
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, Villeurbanne, F-69622, France
- Institut Universitaire de France, Paris, France
| | | | - Colomban de Vargas
- CNRS, Sorbonne Université, FR2424, ABiMS, Station Biologique de Roscoff, Roscoff, 29680, France
- Sorbonne Université, CNRS, Station Biologique de Roscoff, AD2M, UMR7144, Place Georges Teissier, Roscoff, 29680, France
| | - Michal Kucera
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany
| |
Collapse
|
2
|
Greco M, Morard R, Darling K, Kucera M. Macroevolutionary patterns in intragenomic rDNA variability among planktonic foraminifera. PeerJ 2023; 11:e15255. [PMID: 37123000 PMCID: PMC10143585 DOI: 10.7717/peerj.15255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 03/28/2023] [Indexed: 05/02/2023] Open
Abstract
Ribosomal intragenomic variability in prokaryotes and eukaryotes is a genomic feature commonly studied for its inflationary impact on molecular diversity assessments. However, the evolutionary mechanisms and distribution of this phenomenon within a microbial group are rarely explored. Here, we investigate the intragenomic variability in 33 species of planktonic foraminifera, calcifying marine protists, by inspecting 2,403 partial SSU sequences obtained from single-cell clone libraries. Our analyses show that polymorphisms are common among planktonic foraminifera species, but the number of polymorphic sites significantly differs among clades. With our molecular simulations, we could assess that most of these mutations are located in paired regions that do not affect the secondary structure of the SSU fragment. Finally, by mapping the number of polymorphic sites on the phylogeny of the clades, we were able to discuss the evolution and potential sources of intragenomic variability in planktonic foraminifera, linking this trait to the distinctive nuclear and genomic dynamics of this microbial group.
Collapse
Affiliation(s)
- Mattia Greco
- Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
- Institut de Ciències del Mar (ICM), Consejo Superior de Investigaciones Científicas, Barcelona, Spain
| | - Raphaël Morard
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
| | - Kate Darling
- School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom
- Biological and Environmental Sciences, University of Stirling, Stirling, United Kingdom
| | - Michal Kucera
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
| |
Collapse
|
3
|
Renewal of planktonic foraminifera diversity after the Cretaceous Paleogene mass extinction by benthic colonizers. Nat Commun 2022; 13:7135. [PMID: 36414628 PMCID: PMC9681854 DOI: 10.1038/s41467-022-34794-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 11/08/2022] [Indexed: 11/23/2022] Open
Abstract
The biotic crisis following the end-Cretaceous asteroid impact resulted in a dramatic renewal of pelagic biodiversity. Considering the severe and immediate effect of the asteroid impact on the pelagic environment, it is remarkable that some of the most affected pelagic groups, like the planktonic foraminifera, survived at all. Here we queried a surface ocean metabarcoding dataset to show that calcareous benthic foraminifera of the clade Globothalamea are able to disperse actively in the plankton, and we show using molecular clock phylogeny that the modern planktonic clades originated from different benthic ancestors that colonized the plankton after the end-Cretaceous crisis. We conclude that the diversity of planktonic foraminifera has been the result of a constant leakage of benthic foraminifera diversity into the plankton, continuously refueling the planktonic niche, and challenge the classical interpretation of the fossil record that suggests that Mesozoic planktonic foraminifera gave rise to the modern communities.
Collapse
|
4
|
Macher JN, Bloska DM, Holzmann M, Girard EB, Pawlowski J, Renema W. Mitochondrial cytochrome c oxidase subunit I (COI) metabarcoding of Foraminifera communities using taxon-specific primers. PeerJ 2022; 10:e13952. [PMID: 36093332 PMCID: PMC9454970 DOI: 10.7717/peerj.13952] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 08/05/2022] [Indexed: 01/19/2023] Open
Abstract
Foraminifera are a species-rich phylum of rhizarian protists that are highly abundant in most marine environments. Molecular methods such as metabarcoding have revealed a high, yet undescribed diversity of Foraminifera. However, so far only one molecular marker, the 18S ribosomal RNA, was available for metabarcoding studies on Foraminifera. Primers that allow amplification of foraminiferal mitochondrial cytochrome oxidase I (COI) and identification of Foraminifera species were recently published. Here we test the performance of these primers for the amplification of whole foraminiferal communities, and compare their performance to that of the highly degenerate LerayXT primers, which amplify the same COI region in a wide range of eukaryotes. We applied metabarcoding to 48 samples taken along three transects spanning a North Sea beach in the Netherlands from dunes to the low tide level, and analysed both sediment samples and meiofauna samples, which contained taxa between 42 µm and 1 mm in body size obtained by decantation from sand samples. We used single-cell metabarcoding (Girard et al., 2022) to generate a COI reference library containing 32 species of Foraminifera, and used this to taxonomically annotate our community metabarcoding data. Our analyses show that the highly degenerate LerayXT primers do not amplify Foraminifera, while the Foraminifera primers are highly Foraminifera- specific, with about 90% of reads assigned to Foraminifera and amplifying taxa from all major groups, i.e., monothalamids, Globothalamea, and Tubothalamea. We identified 176 Foraminifera ASVs and found a change in Foraminifera community composition along the beach transects from high tide to low tide level, and a dominance of single-chambered monothalamid Foraminifera. Our results highlight that COI metabarcoding can be a powerful tool for assessing Foraminiferal communities.
Collapse
Affiliation(s)
- Jan-Niklas Macher
- Marine Biodiversity, Naturalis Biodiversity Center, Leiden, The Netherlands
| | | | - Maria Holzmann
- Department of Genetics & Evolution, University of Geneva, Geneva, Switzerland
| | - Elsa B. Girard
- Marine Biodiversity, Naturalis Biodiversity Center, Leiden, The Netherlands,Department of Ecosystem & Landscape Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Jan Pawlowski
- Laboratory of Paleoceanography, Institute of Oceanology Polish Academy of Sciences, Sopot, Poland
| | - Willem Renema
- Marine Biodiversity, Naturalis Biodiversity Center, Leiden, The Netherlands,Department of Ecosystem & Landscape Dynamics, University of Amsterdam, Amsterdam, Netherlands
| |
Collapse
|
5
|
Macher JN, Wideman JG, Girard EB, Langerak A, Duijm E, Jompa J, Sadekov A, Vos R, Wissels R, Renema W. First report of mitochondrial COI in foraminifera and implications for DNA barcoding. Sci Rep 2021; 11:22165. [PMID: 34772985 PMCID: PMC8589990 DOI: 10.1038/s41598-021-01589-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 10/28/2021] [Indexed: 01/04/2023] Open
Abstract
Foraminifera are a species-rich phylum of rhizarian protists that are highly abundant in many marine environments and play a major role in global carbon cycling. Species recognition in Foraminifera is mainly based on morphological characters and nuclear 18S ribosomal RNA barcoding. The 18S rRNA contains variable sequence regions that allow for the identification of most foraminiferal species. Still, some species show limited variability, while others contain high levels of intragenomic polymorphisms, thereby complicating species identification. The use of additional, easily obtainable molecular markers other than 18S rRNA will enable more detailed investigation of evolutionary history, population genetics and speciation in Foraminifera. Here we present the first mitochondrial cytochrome c oxidase subunit 1 (COI) gene sequences ("barcodes") of Foraminifera. We applied shotgun sequencing to single foraminiferal specimens, assembled COI, and developed primers that allow amplification of COI in a wide range of foraminiferal species. We obtained COI sequences of 49 specimens from 17 species from the orders Rotaliida and Miliolida. Phylogenetic analysis showed that the COI tree is largely congruent with previously published 18S rRNA phylogenies. Furthermore, species delimitation with ASAP and ABGD algorithms showed that foraminiferal species can be identified based on COI barcodes.
Collapse
Affiliation(s)
- Jan-Niklas Macher
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands.
| | - Jeremy G Wideman
- Biodesign Center for Mechanisms of Evolution, School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Elsa B Girard
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands
- Department of Ecosystem and Landscape Dynamics, Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, The Netherlands
| | - Anouk Langerak
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands
| | - Elza Duijm
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands
| | | | - Aleksey Sadekov
- ARC Centre of Excellence for Coral Reef Studies, Ocean Graduate School, The University of Western Australia, Crawley, Australia
| | - Rutger Vos
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands
- Institute of Biology, Leiden University, Leiden, The Netherlands
| | - Richard Wissels
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands
| | - Willem Renema
- Naturalis Biodiversity Center, Marine Biodiversity, Leiden, The Netherlands
- Department of Ecosystem and Landscape Dynamics, Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, The Netherlands
| |
Collapse
|
6
|
Milivojević T, Rahman SN, Raposo D, Siccha M, Kucera M, Morard R. High variability in SSU rDNA gene copy number among planktonic foraminifera revealed by single-cell qPCR. ISME COMMUNICATIONS 2021; 1:63. [PMID: 36750661 PMCID: PMC9723665 DOI: 10.1038/s43705-021-00067-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 10/07/2021] [Accepted: 10/14/2021] [Indexed: 01/09/2023]
Abstract
Metabarcoding has become the workhorse of community ecology. Sequencing a taxonomically informative DNA fragment from environmental samples gives fast access to community composition across taxonomic groups, but it relies on the assumption that the number of sequences for each taxon correlates with its abundance in the sampled community. However, gene copy number varies among and within taxa, and the extent of this variability must therefore be considered when interpreting community composition data derived from environmental sequencing. Here we measured with single-cell qPCR the SSU rDNA gene copy number of 139 specimens of five species of planktonic foraminifera. We found that the average gene copy number varied between of ~4000 to ~50,000 gene copies between species, and individuals of the same species can carry between ~300 to more than 350,000 gene copies. This variability cannot be explained by differences in cell size and considering all plausible sources of bias, we conclude that this variability likely reflects dynamic genomic processes acting during the life cycle. We used the observed variability to model its impact on metabarcoding and found that the application of a correcting factor at species level may correct the derived relative abundances, provided sufficiently large populations have been sampled.
Collapse
Affiliation(s)
- Tamara Milivojević
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359, Bremen, Germany
- Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Shirin Nurshan Rahman
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359, Bremen, Germany
| | - Débora Raposo
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359, Bremen, Germany
| | - Michael Siccha
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359, Bremen, Germany
| | - Michal Kucera
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359, Bremen, Germany
| | - Raphaël Morard
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359, Bremen, Germany.
| |
Collapse
|
7
|
De Luca D, Piredda R, Sarno D, Kooistra WHCF. Resolving cryptic species complexes in marine protists: phylogenetic haplotype networks meet global DNA metabarcoding datasets. THE ISME JOURNAL 2021; 15:1931-1942. [PMID: 33589768 PMCID: PMC8245484 DOI: 10.1038/s41396-021-00895-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 12/23/2020] [Accepted: 01/14/2021] [Indexed: 12/21/2022]
Abstract
Marine protists have traditionally been assumed to be lowly diverse and cosmopolitan. Yet, several recent studies have shown that many protist species actually consist of cryptic complexes of species whose members are often restricted to particular biogeographic regions. Nonetheless, detection of cryptic species is usually hampered by sampling coverage and application of methods (e.g. phylogenetic trees) that are not well suited to identify relatively recent divergence and ongoing gene flow. In this paper, we show how these issues can be overcome by inferring phylogenetic haplotype networks from global metabarcoding datasets. We use the Chaetoceros curvisetus (Bacillariophyta) species complex as study case. Using two complementary metabarcoding datasets (Ocean Sampling Day and Tara Oceans), we equally resolve the cryptic complex in terms of number of inferred species. We detect new hypothetical species in both datasets. Gene flow between most of species is absent, but no barcoding gap exists. Some species have restricted distribution patterns whereas others are widely distributed. Closely related taxa occupy contrasting biogeographic regions, suggesting that geographic and ecological differentiation drive speciation. In conclusion, we show the potential of the analysis of metabarcoding data with evolutionary approaches for systematic and phylogeographic studies of marine protists.
Collapse
Affiliation(s)
- Daniele De Luca
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
- Department of Biology, Botanical Garden of Naples, University of Naples Federico II, Naples, Italy
| | - Roberta Piredda
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Diana Sarno
- Department of Research Infrastructure for Marine Biological Resources, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Wiebe H C F Kooistra
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy.
| |
Collapse
|
8
|
Latitudinal Differentiation among Modern Planktonic Foraminiferal Populations of Central Mediterranean: Species–Specific Distribution Patterns and Size Variability. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2021. [DOI: 10.3390/jmse9050551] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Studies of the spatial distribution and size of modern planktonic foraminifera are still lacking in the Mediterranean Sea. In this study, 17 core-top sediments collected from a north-south transect along the central Mediterranean have been analyzed for planktonic foraminiferal content, in terms of their distributional pattern and intraspecific size variability. Among the analyzed planktonic foraminiferal species, Globigerina bulloides and Globigerinoides ruber (w) were the most abundant, presenting an antagonistic behavior and an overall decreasing trend in their average size values from Adriatic to Ionian sub-basins. Intraspecific differences have been also documented for G. ruber (w), with the dominant sensu stricto morphotype to present generally higher frequencies and more constant shell sizes than sensu lato. The greater size variability of the latter is possibly related to its adaptation in particular hydrographic conditions based on its depth habitat preference and ecological characteristics to reach the (sub)optimum growth conditions. The rest of the species occur in minor percentages and show on average 11% increase with decreasing latitude characterized by distinct species-specific size variations along the transect. Our results show that the relationship between planktonic foraminifera shell size and abundance or sea surface temperature are either absent or weaker than previously reported for other regions and that in central Mediterranean assemblages’ size may be mainly related to nutrient availability. Besides the environmental parameters (sea surface temperature, primary productivity, water depth, stratification), the possible hidden cryptic diversity, still lingers to be consistently determined, could give a better understanding of the geographic and morphological differentiation within the Mediterranean planktonic populations.
Collapse
|
9
|
Barrenechea Angeles I, Lejzerowicz F, Cordier T, Scheplitz J, Kucera M, Ariztegui D, Pawlowski J, Morard R. Planktonic foraminifera eDNA signature deposited on the seafloor remains preserved after burial in marine sediments. Sci Rep 2020; 10:20351. [PMID: 33230106 PMCID: PMC7684305 DOI: 10.1038/s41598-020-77179-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 11/02/2020] [Indexed: 01/08/2023] Open
Abstract
Environmental DNA (eDNA) metabarcoding of marine sediments has revealed large amounts of sequences assigned to planktonic taxa. How this planktonic eDNA is delivered on the seafloor and preserved in the sediment is not well understood. We address these questions by comparing metabarcoding and microfossil foraminifera assemblages in sediment cores taken off Newfoundland across a strong ecological gradient. We detected planktonic foraminifera eDNA down to 30 cm and observed that the planktonic/benthic amplicon ratio changed with depth. The relative proportion of planktonic foraminiferal amplicons remained low from the surface down to 10 cm, likely due to the presence of DNA from living benthic foraminifera. Below 10 cm, the relative proportion of planktonic foraminifera amplicons rocketed, likely reflecting the higher proportion of planktonic eDNA in the DNA burial flux. In addition, the microfossil and metabarcoding assemblages showed a congruent pattern indicating that planktonic foraminifera eDNA is deposited without substantial lateral advection and preserves regional biogeographical patterns, indicating deposition by a similar mechanism as the foraminiferal shells. Our study shows that the planktonic eDNA preserved in marine sediments has the potential to record climatic and biotic changes in the pelagic community with the same spatial and temporal resolution as microfossils.
Collapse
Affiliation(s)
- Inès Barrenechea Angeles
- Department of Genetics and Evolution, University of Geneva, Boulevard d'Yvoy 4, 1205, Geneva, Switzerland.,Department of Earth Sciences, University of Geneva, Rue des Maraîchers 13, 1205, Geneva, Switzerland
| | - Franck Lejzerowicz
- Jacobs School of Engineering, University of California San Diego, La Jolla, USA
| | - Tristan Cordier
- Department of Genetics and Evolution, University of Geneva, Boulevard d'Yvoy 4, 1205, Geneva, Switzerland
| | - Janin Scheplitz
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse 8, 28359, Bremen, Germany
| | - Michal Kucera
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse 8, 28359, Bremen, Germany
| | - Daniel Ariztegui
- Department of Earth Sciences, University of Geneva, Rue des Maraîchers 13, 1205, Geneva, Switzerland
| | - Jan Pawlowski
- Department of Genetics and Evolution, University of Geneva, Boulevard d'Yvoy 4, 1205, Geneva, Switzerland.,Institute of Oceanology, Polish Academy of Sciences, 81-712, Sopot, Poland
| | - Raphaël Morard
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse 8, 28359, Bremen, Germany.
| |
Collapse
|
10
|
Pawłowska J, Wollenburg JE, Zajączkowski M, Pawlowski J. Planktonic foraminifera genomic variations reflect paleoceanographic changes in the Arctic: evidence from sedimentary ancient DNA. Sci Rep 2020; 10:15102. [PMID: 32934321 PMCID: PMC7492196 DOI: 10.1038/s41598-020-72146-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 07/08/2020] [Indexed: 11/09/2022] Open
Abstract
Deciphering the evolution of marine plankton is typically based on the study of microfossil groups. Cryptic speciation is common in these groups, and large intragenomic variations occur in ribosomal RNA genes of many morphospecies. In this study, we correlated the distribution of ribosomal amplicon sequence variants (ASVs) with paleoceanographic changes by analyzing the high-throughput sequence data assigned to Neogloboquadrina pachyderma in a 140,000-year-old sediment core from the Arctic Ocean. The sedimentary ancient DNA demonstrated the occurrence of various N. pachyderma ASVs whose occurrence and dominance varied through time. Most remarkable was the striking appearance of ASV18, which was nearly absent in older sediments but became dominant during the last glacial maximum and continues to persist today. Although the molecular ecology of planktonic foraminifera is still poorly known, the analysis of their intragenomic variations through time has the potential to provide new insight into the evolution of marine biodiversity and may lead to the development of new and important paleoceanographic proxies.
Collapse
Affiliation(s)
- Joanna Pawłowska
- Institute of Oceanology Polish Academy of Sciences, Sopot, Poland.
| | | | | | - Jan Pawlowski
- Institute of Oceanology Polish Academy of Sciences, Sopot, Poland.,University of Geneva, Geneva, Switzerland
| |
Collapse
|
11
|
Morard R, Füllberg A, Brummer GJA, Greco M, Jonkers L, Wizemann A, Weiner AKM, Darling K, Siccha M, Ledevin R, Kitazato H, de Garidel-Thoron T, de Vargas C, Kucera M. Genetic and morphological divergence in the warm-water planktonic foraminifera genus Globigerinoides. PLoS One 2019; 14:e0225246. [PMID: 31805130 PMCID: PMC6894840 DOI: 10.1371/journal.pone.0225246] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Accepted: 10/31/2019] [Indexed: 11/19/2022] Open
Abstract
The planktonic foraminifera genus Globigerinoides provides a prime example of a species-rich genus in which genetic and morphological divergence are uncorrelated. To shed light on the evolutionary processes that lead to the present-day diversity of Globigerinoides, we investigated the genetic, ecological and morphological divergence of its constituent species. We assembled a global collection of single-cell barcode sequences and show that the genus consists of eight distinct genetic types organized in five extant morphospecies. Based on morphological evidence, we reassign the species Globoturborotalita tenella to Globigerinoides and amend Globigerinoides ruber by formally proposing two new subspecies, G. ruber albus n.subsp. and G. ruber ruber in order to express their subspecies level distinction and to replace the informal G. ruber "white" and G. ruber "pink", respectively. The genetic types within G. ruber and Globigerinoides elongatus show a combination of endemism and coexistence, with little evidence for ecological differentiation. CT-scanning and ontogeny analysis reveal that the diagnostic differences in adult morphologies could be explained by alterations of the ontogenetic trajectories towards final (reproductive) size. This indicates that heterochrony may have caused the observed decoupling between genetic and morphological diversification within the genus. We find little evidence for environmental forcing of either the genetic or the morphological diversification, which allude to biotic interactions such as symbiosis, as the driver of speciation in Globigerinoides.
Collapse
Affiliation(s)
- Raphaël Morard
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
| | - Angelina Füllberg
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
| | - Geert-Jan A. Brummer
- NIOZ Royal Netherlands Institute for Sea Research, Department of Ocean Systems, and Utrecht University, Den Burg, and Utrecht University, The Netherlands
- Vrije Universiteit Amsterdam, Department of Earth Sciences, Faculty of Science, Amsterdam, The Netherlands
| | - Mattia Greco
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
| | - Lukas Jonkers
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
| | - André Wizemann
- Leibniz Centre for Tropical Marine Research, Bremen, Germany
| | - Agnes K. M. Weiner
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
- Department of Biological Sciences, Smith College, Northampton, Massachusetts, United States of America
| | - Kate Darling
- School of GeoSciences, University of Edinburgh, Edinburgh, Scotland, United Kingdom
- School of Geography and Sustainable Development, University of St Andrews, St Andrews, Scotland, United Kingdom
| | - Michael Siccha
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
| | - Ronan Ledevin
- UMR5199 PACEA, Université de Bordeaux, Allée Geoffroy Saint Hilaire, Pessac, France
| | - Hiroshi Kitazato
- Japan Agency for Marine Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan
| | | | - Colomban de Vargas
- Sorbonne Université, CNRS, Station Biologique de Roscoff, UMR 7144, ECOMAP, Roscoff, France
- Research Federation for the Study of Global Ocean Systems Ecology and Evolution, FR2022/Tara GOSEE, Paris, France
| | - Michal Kucera
- MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany
| |
Collapse
|