Kaasalainen, Ulla Susanna

[["dc.bibliographiccitation.artnumber","e0129526"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.lastpage","12"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Kaasalainen, Ulla"],["dc.contributor.author","Heinrichs, Jochen"],["dc.contributor.author","Krings, Michael"],["dc.contributor.author","Myllys, Leena"],["dc.contributor.author","Grabenhorst, Heinrich"],["dc.contributor.author","Rikkinen, Jouko"],["dc.contributor.author","Schmidt, Alexander R."],["dc.date.accessioned","2018-11-07T09:55:56Z"],["dc.date.available","2018-11-07T09:55:56Z"],["dc.date.issued","2015"],["dc.description.abstract","One of the most important issues in molecular dating studies concerns the incorporation of reliable fossil taxa into the phylogenies reconstructed from DNA sequence variation in extant taxa. Lichens are symbiotic associations between fungi and algae and/or cyanobacteria. Several lichen fossils have been used as minimum age constraints in recent studies concerning the diversification of the Ascomycota. Recent evolutionary studies of Lecanoromycetes, an almost exclusively lichen-forming class in the Ascomycota, have utilized the Eocene amber inclusion Alectoria succinic as a minimum age constraint. However, a re-investigation of the type material revealed that this inclusion in fact represents poorly preserved plant remains, most probably of a root. Consequently, this fossil cannot be used as evidence of the presence of the genus Alectoria (Parmeliaceae, Lecanorales) or any other lichens in the Paleogene. However, newly discovered inclusions from Paleogene Baltic and Bitterfeld amber verify that alectorioid morphologies in lichens were in existence by the Paleogene. The new fossils represent either a lineage within the alectorioid group or belong to the genus Oropogon."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2015"],["dc.identifier.doi","10.1371/journal.pone.0129526"],["dc.identifier.isi","000355955300138"],["dc.identifier.pmid","26053106"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11959"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36860"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","Najko"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Alectorioid Morphologies in Paleogene Lichens: New Evidence and Re-Evaluation of the Fossil Alectoria succini Magdefrau"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","127"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","FOSSIL RECORD"],["dc.bibliographiccitation.lastpage","135"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Hartl, C."],["dc.contributor.author","Schmidt, A. R."],["dc.contributor.author","Heinrichs, Jochen"],["dc.contributor.author","Seyfullah, Leyla J."],["dc.contributor.author","Schaefer, N."],["dc.contributor.author","Groehn, Carsten"],["dc.contributor.author","Rikkinen, Jouko"],["dc.contributor.author","Kaasalainen, Ulla"],["dc.date.accessioned","2018-11-07T10:02:30Z"],["dc.date.available","2018-11-07T10:02:30Z"],["dc.date.issued","2015"],["dc.description.abstract","The fossil record of lichens is scarce and many putative fossil lichens do not show an actual physiological relationship between mycobionts and photobionts or a typical habit, and are therefore disputed. Amber has preserved a huge variety of organisms in microscopic fidelity, and so the study of amber fossils is promising for elucidating the fossil history of lichens. However, so far it has not been tested as to how amber inclusions of lichens are preserved regarding their internal characters, ultrastructure, and chemofossils. Here, we apply light microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and Raman spectroscopy to an amber-preserved Eocene lichen in order to gain information about the preservation of the fossil. The lichen thallus displays lifelike tissue preservation including the upper and lower cortex, medulla, photobiont layer, apothecia, and soredia. SEM analysis revealed globular photobiont cells in contact with the fungal hyphae, as well as impressions of possible former crystals of lichen compounds. EDX analysis permitted the differentiation between halite and pyrite crystals inside the lichen which were likely formed during the later diagenesis of the amber piece. Raman spectroscopy revealed the preservation of organic compounds and a difference between the composition of the cortex and the medulla of the fossil."],["dc.description.sponsorship","Alexander von Humboldt Foundation"],["dc.identifier.doi","10.5194/fr-18-127-2015"],["dc.identifier.isi","000371181900004"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12566"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38236"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Copernicus Gesellschaft Mbh"],["dc.relation.issn","2193-0074"],["dc.relation.issn","2193-0066"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0/"],["dc.title","Lichen preservation in amber: morphology, ultrastructure, chemofossils, and taphonomic alteration"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]