المؤلفون: M. Rodrigo-Gámiz, A. García-Alix, G. Jiménez-Moreno, M.J. Ramos-Román, J. Camuera, J.L. Toney, D. Sachse, R.S. Anderson, J.S. Sinninghe Damsté

مصطلحات موضوعية: GDGTs distribution, mean annual air temperature reconstruction, lake pH reconstruction, lake sediment record, southern Iberian Peninsula, Heinrich Stadials, Dansgaard–Oeschger events

الوصف: This data file contains the total organic carbon (TOC) content and the distribution of isoprenoid and branched glycerol dialkyl glycerol tetraethers (isoGDGTs and brGDGTs, respectively) from the Padul palaeolake record (Padul-15-05 sediment core) covering the last 36-4.7 kyr. BrGDGTs-based indices (MBT'5ME and CBT') have been calculated and used for reconstructing paleoenvironmental conditions such as mean annual air temperature (MAAT), mean temperature of Months Above Freezing (MAF) and lake-pH. The identification of the IIIa'' isomer and calculation of the IIIa'' ratio have been used to evaluate the in-situ production in the water column of brGDGTs. The abundance of the isomer of crenarchaeol (%cren') relative to crenarchaeol evaluates the presence of other archaea than aquatic Thaumarchaeota. The composition of the brGDGTs in form of in the Padul palaeolake sedimentary record (triangles). The tetramethylated (Ia-c), pentamethylated (IIa-IIc and IIa'-IIc'), and hexamethylated (IIIa-IIIc and IIIa'-IIIc') brGDGTs are provided in order to compare with data reported from surface sediments of other lakes over the world.

العلاقة: https://zenodo.org/record/5643130; https://doi.org/10.5281Test/zenodo.5643130; oai:zenodo.org:5643130

الإتاحة: https://doi.org/10.5281Test/zenodo.5643130
https://doi.org/10.5281Test/zenodo.5643129
https://zenodo.org/record/5643130

المؤلفون: Stelbrink, Björn, Jovanovska, Elena, Levkov, Zlatko, Ognjanova-Rumenova, Nadja, Wilke, Thomas, Albrecht, Christian

مصطلحات موضوعية: ancient lakes, sediment record, Aneumastus, Miocene

الوصف: Due to the ubiquity and high dispersal capacity of unicellular eukaryotes, their often extraordinary diversity found in isolated and long-lived ecosystems such as ancient lakes is typically attributed to multiple colonization events rather than to in situ speciation. However, respective evolutionary studies are very scarce and the often high number of species flocks in ancient lakes across multicellular taxa raises the question whether unicellular species, such as diatoms, may radiate as well. Here, we use an integrative approach that includes molecular data from benthic diatom species of the genus Aneumastus endemic to ancient Lake Ohrid, fossil data obtained from the sediment record of a recent deep-drilling project and biogeographical information to test if this group, indeed, constitutes a species flock. Molecular-clock and phylogenetic analyses indicate a young monophyletic group of several endemic species. Molecular, fossil and biogeographical data strongly suggest a rapid intra-lacustrine diversification, which was possibly triggered by the emergence of novel habitats. This finding is the first evidence for a species flock in diatoms and suggests that in situ speciation is also a relevant evolutionary process for unicellular eukaryotes in isolated ecosystems. ; SSU-Align input and output filesInput and output files for the 18S aligment using the software SSU-ALIGNSSU_input_output_files.zipPhylogenetic tree filesThis file contains RAxML and MrBayes tree files for the 'raphid' and 'Aneumastus' datasets as well as BEAST MCC tree files for both the relaxed- and strict-clock analysesPhylogenetic_tree_files.zip

العلاقة: https://zenodo.org/communities/dryad; https://zenodo.org/record/4987664; https://doi.org/10.5061/dryad.qf0ft85Test; oai:zenodo.org:4987664

الإتاحة: https://doi.org/10.5061/dryad.qf0ft85Test
https://doi.org/10.1111/jeb.13368Test
https://zenodo.org/record/4987664