Diatom life cycles and ecology in the Cretaceous

Jewson, David H.; Harwood, David M.

doi:10.1111/jpy.12519

Cited by 8 publications

(3 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Early Late Cretaceous Hemiaulus from French amber (Charentes) corresponds to mid-latitude coastal environments (Girard et al, 2008, Girard et al, 2009a, 2009bGirard, 2010). This is consistent with the observation of Jewson and Harwood (2017), who suggested that Early Cretaceous diatoms were restricted to continental margins. Late Cretaceous diatom assemblages (including Hemiaulus) are known from extensive diatomites developed in different geographical zones: the eastern Urals and north-western Siberia (e.g.…”

Section: Long Ranging Hemiaulus: Palaeogeographical and Palaeoecologisupporting

confidence: 93%

Thai amber: insights into early diatom history?

Girard

Martin

Buffetaut

et al. 2020

BSGF - Earth Sci. Bull.

View full text Add to dashboard Cite

The origin of the diatom still remains enigmatic. Their fossil record is scarce until the Late Cretaceous and great divergences exist between molecular data and the early fossil evidences. While molecular data indicate an origin during the Triassic or Lower Jurassic, early fossil evidences are only from the Late Jurassic-Early Cretaceous. The discovery of diatoms in French mid-Cretaceous amber by the end of the 2000’s already questioned a potential bias in diatom fossil record as it made older many diatom lineages known before by the end of the Cretaceous only. Thai amber allows the discovery of a new diatom specimen that has been attributed to the genus Hemiaulus. This material is difficult to date, but fossil assemblages and sedimentological data indicate that Thai amber and its Hemiaulus specimen are Late Jurassic-Early Cretaceous in age. This discovery extended the fossil record of the bipolar diatoms and of the genus Hemiaulus of several dozens of millions years and brings closer the fossil evidences and molecular data (that estimated an origin of the bipolar diatoms at around 150 Ma ago). It reinforces the hypothesis of a pre-Cretaceous fossil diatom record and also supports an origin of the diatoms in shallow coastal environments.

show abstract

Section: Long Ranging Hemiaulus: Palaeogeographical and Palaeoecologisupporting

confidence: 93%

Thai amber: insights into early diatom history?

Girard

Martin

Buffetaut

et al. 2020

BSGF - Earth Sci. Bull.

View full text Add to dashboard Cite

show abstract

“…S5, Supporting Information). A recent study suggested that a thick frustule was crucial for diatom success (Jewson and Harwood 2017). A strong frustule was perhaps also a necessary trait for not just free-living diatoms, but for symbiotic diatoms considering that it provides physical protection, and perhaps a means for keeping an internal symbiont more secure.…”

Section: Resultsmentioning

confidence: 99%

The genetic diversity and evolution of diatom-diazotroph associations highlights traits favoring symbiont integration

Caputo

Nylander

Foster

2019

FEMS Microbiology Letters

View full text Add to dashboard Cite

Diatom diazotroph associations (DDAs) are a widespread marine planktonic symbiosis between several diatom genera and di-nitrogen (N2)-fixing bacteria. Combining single cell confocal microscopy observations and molecular genetic approaches on individual field collected cells, we determined the phylogenetic diversity, distribution and evolution of the DDAs. Confocal analyses coupled with 3-D imaging re-evaluated the cellular location of DDA symbionts. DDA diversity was resolved by paired gene sequencing (18S rRNA and rbcL genes, 16S rRNA and nifH genes). A survey using the newly acquired sequences against public databases found sequences with high similarity (99–100%) to either host (18S rRNA) or symbiont (16S rRNA) in atypical regions for DDAs (high latitudes, anoxic basin and copepod gut). Concatenated phylogenies were congruent for the host and cyanobacteria sequences and implied co-evolution. Time-calibrated trees dated the appearance of N2 fixing planktonic symbiosis from 100–50Mya and were consistent with the symbiont cellular location: symbioses with internal partners are more ancient. An ancestral state reconstruction traced the evolution of traits in DDAs and highlight that the adaptive radiation to the marine environment was likely facilitated by the symbiosis. Our results present the evolutionary nature of DDAs and provide new genetic and phenotypic information for these biogeochemically relevant populations.

show abstract

“…The frustules are intricately ornamented, and when viewed in the light microscope, species‐level identifications can be readily made. The silica cell walls may persist for millions of years in sediments with a sufficiently high abundance to reconstruct entire life histories (Jewson & Harwood, ). With global estimates of over 100,000 species (Mann & Droop, ), which occupy most marine and freshwater habitats, diatoms have proven useful as biological indicators of environmental change among many aquatic systems (Smol & Stoermer, ).…”

Section: Diatoms As the Next Model Organism In Resurrection Ecologymentioning

confidence: 99%

Paleolimnology and resurrection ecology: The future of reconstructing the past

Burge

Edlund

Frisch

2017

Evolutionary Applications

View full text Add to dashboard Cite

Paleolimnologists have utilized lake sediment records to understand historical lake and landscape development, timing and magnitude of environmental change at lake, watershed, regional and global scales, and as historical datasets to target watershed and lake management. Resurrection ecologists have long recognized lake sediments as sources of viable propagules (“seed or egg banks”) with which to explore questions of community ecology, ecological response, and evolutionary ecology. Most researchers consider Daphnia as the primary model organism in these efforts, but many other aquatic biota, from viruses to macrophytes, similarly produce viable propagules that are incorporated in the sediment record but have been underutilized in resurrection ecology. The common goals shared by these two disciplines have led to mutualistic and synergistic collaborations—a development that must be encouraged to expand. We give an overview of the achievements of paleolimnology and the reconstruction of environmental history of lakes, review the untapped diversity of aquatic organisms that produce dormant propagules, compare Daphnia as a model of resurrection ecology with other organisms amenable to resurrection studies, especially diatoms, and consider new research directions that represent the nexus of these two fields.

show abstract

Diatom life cycles and ecology in the Cretaceous

Cited by 8 publications

References 68 publications

Thai amber: insights into early diatom history?

Thai amber: insights into early diatom history?

The genetic diversity and evolution of diatom-diazotroph associations highlights traits favoring symbiont integration

Paleolimnology and resurrection ecology: The future of reconstructing the past

Contact Info

Product

Resources

About