Database of phenolic measurements of European ivies (Hedera L., Araliaceae)

Résumé

We present two databases of phenolic content measurements of three ivy species (Hedera L., Araliaceae) that are naturally distributed across continental Europe: H. helix, H. hibernica, and H. iberica. We sampled a total of 82 ivy populations in the wild in the Iberian Peninsula representing adequately the natural distribution of the species in the sampled area and the global distribution of H. iberica, endemic of the south-west of the Iberian Peninsula. In each population five individuals were sampled whenever it was possible and a leaf from a vegetative branch (VL) and another from a reproductive branch (RL) were collected for phenolic measurement. Geographic information (latitude, longitude and altitude) was retrieved for each population. Phenolic content was estimated as the absorbance at 329 nm per mg of fresh leaf weight (A329), as the absorption peak of phenylpropanoids, the most abundant phenolic compounds of ivies, is located at this wavelength (Murray & Hackett, 1991). As an additional estimate we measured the area under the absorbance curve for the interval 280-400 nm per mg of fresh leaf weight (AUC280-400) following Del-Castillo-Alonso et al. (2015). Climatic information for each locality was retrieved for 22 macroclimatic variables available in WorldClim 2.1 with a 2.5min resolution, including 19 bioclimatic variables, solar radiation, water vapor pressure and wind speed (Fick and Hijmans, 2017). The first version of the presented databases (v1) includes all the geographic, phenolic and climatic information used for the analyses in Gallego-Narbón et al. (under review). All the samples collected are available at the herbarium of Universidad Autónoma de Madrid (MAUAM). The first database (Hedera_Phenolics_samples_v1.xlsx) includes sample information (species, population, individual number, leaf type and sample id), geographic information (latitude, longitude and altitude) and phenolic content measurements (A329 and AUC280-400) for 748 leaf samples of 82 ivy populations of H. helix, H. hibernica and H. iberica, This information is included in the first sheet (SamplePhen). The second sheet includes an explanation of the variables of the first sheet (SampleVar). The second database (Hedera_Phenolics_populations_v1.xlsx) includes population information (species, population, individual number, leaf type and sample id), geographic information (latitude, longitude and altitude) and mean phenolic content measurements (A329 and AUC280-400) per population for 82 ivy populations of H. helix, H. hibernica and H. iberica, and climatic information for the 22 macroclimatic variables extracted from WorldClim 2.1 per population. This information is included in the first sheet (PopulationPhen). The second sheet includes an explanation of the variables of the first sheet (PopulationVar).