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dc.contributor.authorMuthreich, Florian
dc.contributor.authorZimmermann, Boris
dc.contributor.authorBirks, Harry John Betteley
dc.contributor.authorVila-Vicosa, Carlos M
dc.contributor.authorSeddon, Alistair
dc.date.accessioned2021-04-22T10:10:04Z
dc.date.available2021-04-22T10:10:04Z
dc.date.created2020-05-19T13:53:59Z
dc.date.issued2020
dc.PublishedJournal of Biogeography. 2020, 1-12.
dc.identifier.issn0305-0270
dc.identifier.urihttps://hdl.handle.net/11250/2739080
dc.description.abstractAim Fossil pollen is an important tool for understanding biogeographical patterns in the past, but the taxonomic resolution of the fossil‐pollen record may be limited to genus or even family level. Chemical analysis of pollen grains has the potential to increase the taxonomic resolution of pollen analysis, but present‐day chemical variability is poorly understood. This study aims to investigate whether a phylogenetic signal is present in the chemical variations of Quercus L. pollen and to assess the prospects of chemical techniques for identification in biogeographical research. Location Portugal. Taxon Six taxa (five species, one subspecies) of Quercus L., Q. faginea, Q. robur, Q. robur ssp. estremadurensis, Q. coccifera, Q. rotundifolia and Q. suber belonging to three sections: Cerris, Ilex and Quercus (Denk, Grimm, Manos, Deng, & Hipp, 2017). Methods We collected pollen samples from 297 individual Quercus trees across a 4° (~450 km) latitudinal gradient and determined chemical differences using Fourier‐transform infrared spectroscopy (FTIR). We used canonical powered partial least squares regression (CPPLS) and discriminant analysis to describe within‐ and between‐species chemical variability. Results We find clear differences in the FTIR spectra from Quercus pollen at the section level (Cerris: ~98%; Ilex: ~100%; Quercus: ~97%). Successful discrimination is based on spectral signals related to lipids and sporopollenins. However, discrimination of species within individual Quercus sections is more challenging: overall, species recall is ~76% and species misidentifications within sections lie between 18% and 31% of the test set. Main Conclusions Our results demonstrate that subgenus level differentiation of Quercus pollen is possible using FTIR methods, with successful classification at the section level. This indicates that operator‐independent FTIR approaches can surpass traditional morphological techniques using light microscopy. Our results have implications both for providing new insights into past colonization pathways of Quercus, and likewise for forecasting future responses to climate change. However, before FTIR techniques can be applied more broadly across palaeoecology and biogeography, our results also highlight a number of research challenges that still need to be addressed, including developing sporopollenin‐specific taxonomic discriminators and determining a more complete understanding of the effects of environmental variation on pollen‐chemical signatures in Quercus.en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleChemical variations in Quercus pollen as a tool for taxonomic identification: Implications for long-term ecological and biogeographical researchen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2020 The Authorsen_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.doi10.1111/jbi.13817
dc.identifier.cristin1811705
dc.source.journalJournal of Biogeographyen_US
dc.source.pagenumber1298-1309en_US
dc.relation.projectNorges forskningsråd: 249844en_US
dc.identifier.citationJournal of Biogeography. 2020, 47 (6), 1298-1309.en_US
dc.source.volume47en_US
dc.source.issue6en_US


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal