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12 results for “Cetraria”
Herbarium specimen image of Cetraria iberica A.Crespo & Barreno, part of the collection of Finnish Museum of Natural History LUOMUS, University of Helsinki
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.<br>- A lossless TIFF image from which the JPEG image has been derived.
Data from: Population structure of mycobionts and photobionts of the widespread lichen Cetraria aculeata
Lichens are symbioses between fungi (mycobionts) and photoautotrophic green algae or cyanobacteria (photobionts). Many lichens occupy large distributional ranges covering several climatic zones. So far, little is known about the large scale phylogeography of lichen photobionts and their role in shaping the distributional ranges of lichens. We studied south polar, temperate and north polar populations of the widely distributed fruticose lichen Cetraria aculeata. Based on DNA sequences from three loci for each symbiont we compared the genetic structure of mycobionts and photobionts. Phylogenetic reconstructions and Bayesian clustering methods divided the mycobiont and photobiont datasets into three groups. An AMOVA shows that the genetic variance of the photobiont is best explained by differentiation between temperate and polar regions and that of the mycobiont by an interaction of climatic and geographical factors. By partialling out the relative contribution of climate, geography and co-dispersal we found that the most relevant factors shaping the genetic structure of the photobiont are climate and a history of co-dispersal. Mycobionts in the temperate region are consistently associated with a specific photobiont lineage. We therefore conclude that a photobiont switch in the past enabled Cetraria aculeata to colonize temperate as well as polar habitats. Rare photobiont switches may increase the geographic range and ecological niche of lichen mycobionts by associating them with locally adapted photobionts in climatically different regions and, together with isolation by distance, may lead to genetic isolation between populations and thus drive the evolution of lichens.
Data from: Population structure of mycobionts and photobionts of the widespread lichen Cetraria aculeata
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Data from: Pleistocene expansion of the bipolar lichen Cetraria aculeata into the Southern hemisphere
Many boreal and polar lichens occupy bipolar distributional ranges that frequently extend into high mountains at lower latitudes. Although such disjunctions are more common among lichens than in other groups of organisms, the geographic origin of bipolar lichen taxa, and the way and time frame in which they colonized their ranges have not been studied in detail. We used the predominantly vegetative, widespread lichen Cetraria aculeata as a model species. We surveyed the origin and history of its bipolar pattern using population genetics, phylogenetic and genealogical reconstruction methods. Cetraria aculeata originated in the Northern Hemisphere and dispersed southwards during the Pleistocene. The genetic signal suggests a Pleistocene dispersive burst in which a population size expansion concurred with the acquisition of a South-American range that culminated in the colonization of the Antarctic.
Figure 7 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 7 - Community classification of four populations of Alphaproteobacteria associated with Cetraria aculeata. The bar on the left indicates the value of the cophenetic distances between communities. From Printzen et al. (2012).
Figure 5 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 5 - Dependency of net photosynthesis (NP) on temperature at various photon flux densities (0 to 1200 µmol m-2 s-1) related to different geographical origins of Cetraria aculeata. Figures are based on measurements of 7-8 thalli per location. Further details under Material and methods.
Figure 4 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 4 - Nucleotide diversity (π) of different populations of photobionts (grey) and mycobionts (white) based on ITS sequences from 222 thalli of Cetraria aculeata (data from Domaschke et al. 2012). Size of the semi-circles is proportional to the diversity level. Circles on the right summarize diversity levels within regions. Numbers of observed haplotypes and estimated absolute numbers following Chao 1 (in brackets) are added. Arrows indicate inferred historical migration events.
Figure 2 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 2 - 95 % parsimony probability haplotype network based on ITS sequences of the mycobiont displaying genetic differences between Beringian samples of the Cetraria aculeata group (grey) and individuals from two haplotype groups present on Iceland and Svalbard (white). Large circles represent haplotypes, each line a mutational step and black dots missing haplotypes. The size of the circles is proportional to the number of individuals sharing that haplotype. The presence of three unconnected haplogroups indicates that the genetic differences between them are too large to find a connection with a 95 % probability of being the most parsimonious one.
Figure 3 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 3 - Species tree of the Cetraria aculeata group inferred from ITS, GPD and mtLSU DNA sequences. For details of the analysis see under Material and methods.
Figure 6 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 6 - Variation partitioning diagrams using climate, geography and co-dispersal as explanatory components for the genetic structure of mycobiont and photobiont populations of Cetraria aculeata. Top, mycobiont; Center, photobiont, explanatory variables climate and spatial distances; Bottom, photobiont, explanatory variables climate and co-dispersal with the mycobiont. Left: genetic structure measured as pair-wise genetic distances between populations. Right: genetic structure measured as SNP composition. Numbers in the Venn diagrams indicate the fraction of the variation that is explained by the respective component or the intersection of components, with medians of the bootstrap analyses in italics. Results of the bootstrap analyses are also displayed in the bar charts with proportions of explained variation on the x-axes. Grey bars indicate results based on the original (non-resampled) data sets. From Fernández-Mendoza et al. (2011).
Data from: Pleistocene expansion of the bipolar lichen Cetraria aculeata into the Southern hemisphere
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Figure 1 from: Printzen C, Domaschke S, Fernández-Mendoza F, Pérez-Ortega S (2013) Biogeography and ecology of Cetraria aculeata, a widely distributed lichen with a bipolar distribution. MycoKeys 6: 33-53. https://doi.org/10.3897/mycokeys.6.3185
Figure 1 - Cetraria aculeata, habit.
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